ontinuous ommissioning Report for the Price Hobgood Building (Bldg. 1507) Submitted to: Office of Energy Management Physical Plant Department Texas A&M University Prepared by: Energy Systems Laboratory 10/30/2007
EXEUTIVE SUMMARY The ontinuous ommissioning ( ) 1 process has been applied to the Price Hobgood building. It is a single-story building consisting of offices and laboratories with a total area of 27,666 square feet, located on the west campus at Texas A&M University. The HVA system is a single duct constant air volume (SDAV) system, and incorporates nine air handling units, one VAV terminal box without reheat, nine exhaust fans, three newly installed fume hoods, and a constant speed HW pump. The HHW pump has been removed from the building hot water loop. A Siemens DD controls system operates the equipment. The commissioning process began on 5/24/07. As of this report date, 2 of 4 recommended measures had been implemented. The ontinuous ommissioning measures recommended included: 1) correct overlapped HW and HHW valve spring ranges, 2) shut down schedule for all AHUs, 3) schedule bathroom exhaust fan to cycle off during unoccupied periods, 4) set outside air properly for AHU-2. Because there is no trended pre- energy consumption data available for this building, the energy baseline analysis were not performed. Based on simulation and engineering analysis, it is estimated that implementation of the proposed ontinuous ommissioning measures would result in $4,000 per year savings. These values are based on a rate of $7.347/mmBtu for chilled water, $9.735/mmBtu for hot water, and $0.079/kWh for electricity. It is strongly recommended that these measures be implemented so that the maximum amount of savings can be achieved. Additionally, it is recommended that the following retrofit recommendations be considered for further building improvement. 1) decouple AHU valves, 2) install 6 lamp T8 laboratory light fixtures in laboratories, 3) install photocell on the east side canopy lights to turn them off during the day. It is estimated that the total cost for retrofitting all of the proposed items would be $23,300 which would result in savings of $7,500 per year and have a simple payback time of 3.1 years. The comfort issues identified in the building included high indoor humidity and elevated temperatures in the west side of the building in the afternoons. The elevated temperatures in the west side building were corrected by flushing dirty coils and allowing the AHUs to fully chilled water valve. The high humidity problem was traced to the coupled control of AHUs chilled water and heating water control valves, i.e. no humidity control in this building. In order to control the humidity level in this building, retrofit the AHU control valves need to be considered. 1 ontinuous ommissioning and are registered trademarks of the Texas Engineering Experiment Station (TEES), the Texas A&M University System, ollege Station, Texas. To improve readability, the symbol will sometimes be omitted.
AKNOWLEDGEMENTS The ontinuous ommissioning process detailed in this report was a collaborative effort among the Office of Energy Management, Area Maintenance, and the Energy Systems Laboratory at Texas A&M University. Many persons from each entity are responsible for the work done in the building, from the field and comfort measurements and measures determination, to the maintenance and controls items implemented. This document is designed to serve as a deliverable from the Energy Systems Laboratory to the Office of Energy Management, and primarily details the activities and measures in which the Energy Systems Laboratory has been involved. The lead investigator for this building was Iraj Solouki. For additional information regarding the information in this report or the overall ontinuous ommissioning program at the Energy Systems Laboratory, please contact Song Deng at (979) 862-1234.
TABLE OF ONTENTS EXEUTIVE SUMMARY... I AKNOWLEDGEMENTS... II TABLE OF ONTENTS... III LIST OF FIGURES...IV LIST OF TABLES... V BAKGROUND... 1 SITE DESRIPTION... 1 General Facility Description... 1 General HVA System Description... 2 Energy and omfort Baselines... 3 ONTINUOUS OMMISSIONING ATIVITIES... 3 ontinuous ommissioning Measures... 3 ontinuous ommissioning Results... 5 MAINTENANE ISSUES AND RETROFIT OPPORTUNITIES... 6 Observed Maintenance Related Issues... 6 Retrofit Opportunities... 8 ONLUSIONS... 12 APPENDIX A HVA AS-BUILT INFORMATION... 13 APPENDIX B FIELD MEASUREMENT REORDS... 17 APPENDIX PRE- ONTROL SETTINGS... 29 APPENDIX D PRE- ONTROL PROGRAMMING... 30
LIST OF FIGURES Figure 1. Hobgood building.... 1 Figure 2. Building location.... 1 Figure 3. AHU-2 Room 108 RA temperature and humidity.... 9 Figure 4. AHU-4 North side offices RA temperature and humidity.... 10 Figure 5. AHU-8 South side offices RA temperature and humidity.... 10 Figure A - 1. AHU-1 schematic diagram.... 14 Figure A - 2. AHU- 3, 5, 6, 7, & 9 schematic diagram.... 15 Figure A - 3. AHU-2, 4, & 8 schematic diagram.... 15 Figure A - 4. HW pump schematic diagram.... 16 Figure A - 5. HHW pump schematic diagram.... 16 Figure A - 6. AHU-1 measurements points.... 17 Figure A - 7. AHU-2 measurements points.... 18 Figure A - 8. AHU-3 measurements points.... 19 Figure A - 9. AHU-4 measurements points.... 20 Figure A - 10. AHU-5 measurements points.... 21 Figure A - 11. AHU-6 measurements points.... 22 Figure A - 12. AHU-7 measurements points.... 23 Figure A - 13. AHU-8 measurements points.... 24 Figure A - 14. AHU-9 measurements points.... 25 Figure A - 15. hilled water loop pressure profile at onset of... 27 Figure A - 16. Hot water loop pressure profile at onset of.... 28 Figure A - 17. Valve control schematic diagram.... 29
LIST OF TABLES Table 1. Recommended measures with priority level and implementation status.... 4 Table 2. Measured and corrected spring ranges.... 4 Table 3. Observed maintenance related issues.... 7 Table 4. Potential retrofit items.... 8 Table 5. Measured light intensity.... 11 Table A- 1. HW and HHW pumping information.... 13 Table A- 2. HVA system airflow design information.... 13 Table A - 3. Relief and exhaust fans with their design specifications.... 14 Table A - 4. AHU-1 air side measurements.... 17 Table A- 5. AHU-1 water side measurements.... 17 Table A- 6. AHU-2 air side measurements.... 18 Table A- 7. AHU-2 water side measurements.... 18 Table A- 8. AHU-3 air side measurements.... 19 Table A- 9. AHU-3 water side measurements.... 19 Table A- 10. AHU-4 air side measurements.... 20 Table A- 11. AHU-4 water side measurements.... 20 Table A- 12. AHU-5 air side measurements.... 21 Table A- 13. AHU-5 water side measurements.... 21 Table A- 14. AHU-6 air side measurements.... 22 Table A- 15. AHU-6 water side measurements.... 22 Table A- 16. AHU-7 air side measurements.... 23 Table A- 17. AHU-7 water side measurements.... 23
Table A- 18. AHU-8 air side measurements.... 24 Table A- 19. AHU-8 water side measurements.... 24 Table A- 20. AHU-9 air side measurements.... 25 Table A - 21. AHU-9 water side measurements.... 25 Table A - 22. Measured HVA system airflow information.... 26 Table A - 23. omfort baseline measurements on 06/06/2007.... 26
BAKGROUND ontinuous ommissioning is an ongoing process to resolve operating problems, improve comfort, optimize energy use and identify retrofits for existing commercial and institutional buildings and central plant facilities. The Energy Systems Laboratory, which trademarked this process, has been under contract with the Physical Plant at Texas A&M University since 1997 to systematically commission the campus buildings as requested. During the time period since this began, more than 70 buildings have been commissioned, resulting in energy savings to Texas A&M University of millions of dollars. For the year 2007, 25 buildings (totaling 2.5 million square feet) have been identified to be commissioned, of which the Hobgood is the sixth. This building was identified as a prime candidate for ontinuous ommissioning due to its high energy cost per square foot and comfort problems. ommissioning began on May 24, 2007. SITE DESRIPTION General Facility Description Figure 1. Hobgood building. Figure 2. Building location. The Price Hobgood building, pictured above in Figure 1, was constructed in 1983 and is located on the west campus of Texas A&M University (see Figure 2 above). It is home to the Agricultural Engineering Research Laboratory, and consists primarily of offices and laboratories. The building is a single story building and has a total area of 27,666 square feet. It is generally occupied on weekdays during the day, but also has some occupancy occasionally at night and on weekends. 1
General HVA System Description Mechanical The chilled water system in the building utilizes one 2 hp, 103 gpm pump that runs continuously. The building pneumatic control valve is DD controlled by chilled water return temperature. The piping system is two-way constant speed flow with bypass. The heating water pump has been removed and the pipes are connected to each other. The pneumatic HHW control valve is DD controlled by heating water return temperature. The piping system is two-way flow with bypass. A summary of the building pumping information is shown in Table A- 1 in the Appendix A. The HVA system in the building is a single duct constant air volume (SDAV) system, and consists of nine air handling units and one VAV terminal box without reheat. Each AHU has a cooling coil and a reheat coil with pneumatic HW and HHW couple controlled valves. The controls system is DD and is powered by Siemens Apogee. The total design maximum supply flow in the building is 28,040 cfm, of which 1,905 cfm is outside air. The total design exhaust flow from the building is 800 cfm, and is achieved with the bathroom exhaust fan EF-3. There are seven more exhaust fans in the laboratories and one in the conference room that run on an as needed basis. The exhaust fan in the conference room (EF-4) is not used anymore since it was designed for the smokers in the room and smoking has been banned. The exhaust fans EF-1 and EF-2 in the fuel analysis laboratories have their own OA dampers that are interlocked with the fan switches and open when the fans are running. The overhead doors in labs 109, 110, 115, and 116 will manually be opened when the exhaust fans are being used. Three newly installed fume hoods have a total exhaust of 1,240 FM. Table A- 2 in Appendix A gives an overview of the AHUs comprising the building HVA system with their design information, and Table A - 3 in Appendix A lists the building exhaust fans and their design information. The lighting system in the building is comprised of 400 W metal halide lamps in the laboratories, four foot T12 lights in the hallways, offices, and bathrooms, and eight foot T12 lights in the east canopy of the building. ontrols The HW pump runs continuously and the building HW pneumatic control valve is DD controlled by the chilled water return temperature. The HHW pump is removed and the pneumatic control valve is DD controlled by the hot water return temperature. A temperature reset schedule for the HHW loop is based on the OADBT. Each SDAV AHU has a pneumatic HHW valve and a pneumatic HW valve. The valves are DD couple controlled. A PXP receives a signal from a room temperature sensor and sends out a pneumatic signal to the valves. This signal goes directly to the HW valve and also goes to an EP switch through which it goes to the HHW valve. The EP switch is designed to send signal air to the valve if the AHU is running and it will send main air to the HHW valve to close it if the AHU is turned off. The HHW valve is normally open (NO) and the spring range is 3-8 psi. The HW valve is normally closed 2
(N) and the spring range is 9-18 psi. The OA damper actuator, which is normally closed, receives its control signal from an EP switch that sends main air to the actuator to fully open it if the AHU is running. Figure A - 17 in Appendix shows a schematic view of the valve control scheme. The VAV box in the conference room is designed to distinguish between heating and cooling mode so that it can operate the damper accordingly. If the temperature sensor which is located in the supply air duct senses cooler supply air temperatures, then the EP switch directs the reversed signal to the actuator to open it more to the room if there is need for more cooling. If the duct temperature sensor detects higher supply air temperatures, then it activates the EP switch to direct the signal from the thermostat directly to the actuator so that it opens more to the room upon a need for more heating. The wires to the EP switch were found to be disconnected and the box was not being controlled. The pneumatic thermostat was also found to be removed and the damper was found to be closed to the room. Energy and omfort Baselines No trended energy consumption data were available for this building. A number of comfort complaints in the building were brought up at the kick off meeting and during the commissioning process. A number of these complaints were simply the cleaning person s dissatisfaction with the 70/75 F mandated heating and cooling set points. However, in some cases other more correctable complaints were received. A general complaint was received that during warm weather many of the offices on the west side of the building experienced warm temperatures. omplaints were received that rooms 105 & 108 experienced a high humidity level. Additionally, high humidity complaints were received from the building. ONTINUOUS OMMISSIONING ATIVITIES The Hobgood building was thoroughly investigated and air and water side measurements were performed on all of the AHUs during the commissioning process as well as temperature and pressure measurements of the primary and secondary chilled and hot water loops. Valve spring ranges for all HW and HHW valves were measured and corrected and the output pressures of the PXP cards were calibrated. The accuracy of the thermostats was verified. The AHUs were remotely observed for their operation and control programming was reviewed. measures were identified and recommended during the commissioning process as well as some retrofit opportunities and maintenance issues. Please refer to Appendix D for all of the documented measurements. ontinuous ommissioning Measures A total of four measures have been identified through the process. These measures are summarized in Table 1 with their priorities and implementation status as of 3
the report submitting date. Detailed findings and measure explanations are provided following Table 1. Table 1. Recommended measures with priority level and implementation status. Number Brief Measure Description Priority Implementation Status 1 orrect overlapped HW and HHW valve spring ranges. High 7/2/2007 2 Shut down schedule for all AHUs. High Pending 3 Schedule bathroom exhaust fan to cycle off during unoccupied periods. High Pending 4 Set outside air intake properly for AHU-2. High 7/31/2007 1. orrect overlapped HW and HHW valve spring ranges. It was discovered during the commissioning process that most of the AHUs had overlapping valve spring ranges. This caused simultaneous heating and cooling to occur and wasted a considerable amount of energy. It was also discovered that some valves had wrong springs installed in them (i.e. HHW valve spring with a lower range installed in HW valve that required a higher range valve spring). Spring ranges were corrected by ESL and a dead band was implemented as of 06-29-07. orrect springs were also installed in the valves that had wrong springs in them. Table 2 below shows the measured valve ranges before correction and corrected valve ranges. AHU-6 HW valve was not accessible to measure the valve range. AHU Measured HW valve spring range (psi) Table 2. Measured and corrected spring ranges. orrected HW valve spring range (psi) Measured HHW valve spring range (psi) orrected HHW valve spring range (psi) 1 4.5-11 - 3-8 - 1 2 8.5-18 9.5-17 3-10 2.5-8 3 9-15 - 3-8 - 4 9-14 - 3-10 3-7 5 7.5-16.5 9-17 1-12 3-7.5 6 11-18 - 3-8 - 2 7 8-19 - 3-7.5-8 1-6.5-1-7-1 9 8-16.5 8.5-17 3-13 3-7.5 Notes for Table 2. 1. Wrong HW valve spring. 2. Was not able to take the HW valve actuator off to adjust the spring range. Notes 4
2. Shut down schedule for all AHUs. At the onset of commissioning, scheduling did not exist in the building for any of the AHUs and all of the AHUs were found to be operating continuously. It is recommended that each of the AHUs be turned off from 10:00 PM to 6:00 AM. This measure has not yet to be implemented. 3. Schedule restroom exhaust fan to cycle off during unoccupied periods. No scheduling was found for the restroom exhaust fan in the building at the time of commissioning. It is recommended that the exhaust fan in the restroom be scheduled to shut down from 10:00 PM to 6:00 AM each night in an effort to prevent negative pressurization in the building, and subsequent infiltration. This recommendation has not yet been implemented. 4. Set outside air intake properly for AHU-2. The OA intake for all AHUs is controlled by a pneumatic damper that either opens the damper completely or closes it completely. A manual damper also exists that can be adjusted to any position, allowing OA intake to be regulated. OA was measured to be 217 FM and the design FM is 100 FM. A calculation based on ASHRAE standard 62.1-2007 revealed that the hall that is served by AHU-2, should receive approximately 130 cfm of outside air. The damper was adjusted by ESL to get the calculated 130 FM of OA for this AHU. ontinuous ommissioning Results Savings Analysis Measured Energy Savings Since there are no trended energy consumption data available for this building at the time of submittal of this report, a baseline and savings analysis involving measured pre- and post- data was not performed. However, based on simulation and engineering analysis, it was estimated that implementation of the recommended measures would result in a total savings of $4,000 per year. This value is based on a rate of $7.347/mmBtu for chilled water, $9.735/mmBtu for hot water, and $0.079/kWh for electricity. 5
omfort Improvements Among the many objectives of ontinuous ommissioning, one is to improve the comfort levels of the occupants in the buildings. High humidity and warm temperatures were the major complaints received before commissioning began. The warm complaints were found to be related to dirty coils and the inability of the PXP cards to open the chilled water valve to a fully open position when needed. The cleaning and back flushing of coils has already allowed better air flow throughout the building and better chilled water flow through the coils, which is also related to this issue. PXP cards have also been calibrated to allow the chilled water valves to be able to open fully as needed, which has improved comfort levels in the building. The damper of exhaust fan EF-1 was found to be stuck in an open position, which caused infiltration of unconditioned outside air and raised the humidity level in the fuel analysis laboratory. This problem has been resolved, and the damper now operates correctly, eliminating this source of infiltration. Exhaust fan EF-2 was found to be wired incorrectly, and was running in a backwards direction. This fan is designed to be turned on during the fuel analysis or engine performance test to remove the fumes from the laboratory and pull fresh outside air in through the openings in the laboratory wall. These openings have dampers that will open when the fan is turned on. The backwards rotation of the fan did not remove the fumes completely from the laboratory, but caused them to be pushed down and out of the openings in the wall instead of being pulled up and out of the opening in the ceiling. The backwards rotation of the fan had also reduced the circulation capability of the fan. This problem was identified and fixed, and the fan now runs in the intended direction, allowing the fumes to be pulled out of the laboratory as designed. The pneumatic thermostat that controls the VAV damper in room 105 was found to be removed with the lines connected to each other. The damper of the VAV box was found to be in a closed position and was directing all of the supply air into the return air plenum, which caused higher temperatures in the room. After disconnecting the signal air to the actuator and plugging it, the damper was put in the fully open position to direct the air to the room. MAINTENANE ISSUES AND RETROFIT OPPORTUNITIES Observed Maintenance Related Issues As a by-product, during the process several maintenance-related issues have been observed that potentially waste energy, cause comfort problems, and sometimes prevent certain measures from being implemented. In order to improve building comfort and maximize potential energy savings, it is recommended that these issues be addressed. These issues are summarized in Table 3 with priorities and implementation status as of the report submittal date. 6
Table 3. Observed maintenance related issues. # Maintenance Related Issues Priority Implementation Status 1 The fire alarm cable is disconnected from the antenna on the roof. High Pending 2 The damper for EF-1 is stuck in the open position. There may be a problem with the electric actuator. Medium 6/25/2007 3 EF-2 is wired backwards and runs backwards. High 5/29/2007 4 AHUs 2, 5, and 7 have dirty filters. Low 6/19/2007 5 The smoke detector for AHU 3 needs to be attached in its proper location. It is currently hanging on the side of AHU. Low 8/8/2007 6 The HHW valves for AHUs 4 and 9 are leaking by. Medium 6/21/2007 7 AHU-6 has a broken belt. High 6/12/2007 8 There is a water leak in the building HHW control valve. High 7/17/2007 9 The condensate pan for AHU-1 is leaking condensate on the ground. Medium 8/31/2007 10 AHUs 2, 4, 8, and 9 have noisy belts that need to be replaced. Low 6/12/2007 11 There are pneumatic leaks in the valve and damper controls for AHU-2, 3, 4, & 6. Medium 7/19/2007 12 EP solenoids for OA damper of AHU-2 and 4 leak air. Medium 7/11/2007 13 AHU-1 has a wrong spring in its chilled water valve. High 7/15/2007 14 Restroom exhaust fan grilles need to be cleaned. Medium 6/12/2007 15 16 17 AHU-8 has a wrong spring (HHW valve spring with a lower range) in its HW valve. AHU-1 HW valve has been leaking out and needs to be repacked or replaced. HHW valve for AHU-6 has been leaking out and needs to be repacked or replaced. High 7/11/2007 Medium 7/3/2007 Medium 7/13/2007 18 AHU2 coil needs to be cleaned. Medium 7/3/2007 19 AHU7 coil needs to be cleaned. Medium 7/10/2007 20 21 There is a 12 psi water pressure drop across the chilled water coil of AHU-9; the maximum specified drop is 4.3 psi. It needs to be flushed. There is an 8 psi water pressure drop across the chilled water coil of AHU-8; the maximum specified drop is 4.3 psi. It needs to be flushed. High 7/16/2007 High 7/13/2007 22 AHU3 coil needs to be cleaned. High 7/6/2007 7
23 AHU5 coil needs to be cleaned. High 7/9/2007 24 AHU8 coil needs to be cleaned. High 7/12/2007 25 HHW control valve for AHU1 is leaking out. Medium 6/25/2007 26 Replace check valve on control air compressor. High 7/16/2007 Retrofit Opportunities As a by-product, during the process several retrofit opportunities have been identified which would potentially improve comfort conditions and achieve extra energy savings in addition to the above recommended measures. It is estimated that these lighting retrofit measures, if implemented, would cost approximately $18,300, and together would have a simple payback of less than 2.5 years. Therefore, it is recommended that these retrofit opportunities be considered. The potential retrofit items are summarized in Table 4 with their purpose, estimated cost, savings and payback. Detailed explanations of each are also provided in this section. Table 4. Potential retrofit items. Number R1 R2 R3 Brief Description Decouple AHU valves. Install 6 lamp T 8 lab light fixtures in laboratories. Install photocell on the east canopy lights to turn them off during daylight hours. Purpose Solve omfort Problems Energy Savings Energy Savings Est. ost ($) Est. Savings ($/yr) Est. Payback (Years) $5,000 - - $18,000 $6,500 2.7 $300 $1,000 0.3 Type of Item apital Improvement Energy Retrofit Energy Retrofit R1. Decouple control of the AHU HW and HHW valves. urrently both HW and HHW valves on all of the AHUs have pneumatic actuators and are DD couple controlled with no humidity control capability. A PXP card receives a signal from the room temperature sensor and sends out a pneumatic signal to the valves to control them. Each AHU has a cooling coil and a reheat coil. In order to control humidity, it is recommended that control of the valves be decoupled to allow each valve to control independently and a humidistat added to the space to fully open the chilled water valve if the humidity level rises above a set point and let the room thermostat control the reheat valve for space temperature. This would allow the chilled water coil 8
to remove moisture and the reheat coil to heat as needed for space temperature control. This will improve space comfort levels and reduce humidity levels in this building. Figure 3 below shows the RA temperature and humidity for room 108 which is served by AHU-2. Figure 4 and Figure 5 below show RA temperature and humidity for north and south side offices that are served by AHU-4 and AHU-8 respectively. As can be seen, the graphs clearly show that the relative humidity was as high as 90% at times. ASHRAE recommends that the relative humidity should be kept between 30 and 60%. The estimated cost of this measure is $5,000. Figure 3. AHU-2 Room 108 RA temperature and humidity. 9
Figure 4. AHU-4 North side offices RA temperature and humidity. Figure 5. AHU-8 South side offices RA temperature and humidity. R2. Install 6 lamp T 8 light fixtures in laboratories. In assessing the building it was determined that there are a total of 93 four foot long fixtures that have four T12 lamps each, and a total of 16 four foot long fixtures that have two T12 lamps each in the building. The decision to retrofit these lights to T8 fixtures 10
has already been made by the university. It is also noticed that there is great potential to retrofit the lighting of the lab area of this building. A total of seventy two 400-watt single-lamp, high-bay metal halide light fixtures are in place in the laboratory areas. A lighting survey of these areas was performed, and light intensity was measured using a handheld light meter. Table 5 below summarizes the result of this survey. Table 5. Measured light intensity. Room No. of Mounting No. of Fixtures Max Min Average Wattage No. fixtures Height (ft) lamps out per circuit Fc Fc Fc 109 12 400 15 1 4 142 23 100 109B 4 400 15 0 4 120 45 77 109 2 400 10 0 4 160 45 95 109D 4 400 15 3 4 46 3 22 110 14 400 15 1 4 154 11 59 115 24 400 35 4 4 105 40 66 116 12 400 35 5 4 20 10 14 According to the 9th Edition of the Illuminating Engineering Society of North America (IESNA) Lighting Handbook, recommended average Fc level for the Hobgood Building laboratories is in a range of 30 50 Fc. In order to save energy and still maintain acceptable light levels in these laboratories, it is recommended to change the 400 watt lamps to 250 watt lamps or install 6 lamp T8 light fixtures with reflectors in the laboratories. The estimated total cost and savings are $18,000 and $6,500/yr. The simple payback is 2.8 years. R3. Install a photocell on the east side canopy lights to turn them off during the daylight hours. The east side canopy lights were observed to stay on during daylight hours. The east side canopy has a total of eleven 255 watt fixtures with 2 bulbs per fixture. These lights are not needed during the day to provide adequate lighting levels in the building. It is recommended that theses lights be controlled with a photocell sensor, to allow them to shut off during the day. This would reduce the electricity consumption somewhat when these lights are not needed. The estimated total cost and savings are $300 and $1,000/yr. The simple payback is 0.3 years. 11
ONLUSIONS The Hobgood Building has been a part of the A&M system since 1983. High energy consumption and comfort problems in the building made it a good candidate for ontinuous ommissioning. The process was performed in a period of three months. It is believed that the measures that have been implemented up to this time will save on energy costs, in addition to improving comfort in the building. If all of the proposed measures are implemented, it is estimated that $4,000 per year can be saved, and the remaining comfort issues can be resolved. Additionally, three potential retrofits were recommended to save energy and improve comfort in the building. After complete implementation of these measures, better energy efficiency will occur in the building, as well as an increase in the productivity of occupants who will be more comfortable in their working environment. A number of maintenance issues have been identified during the ontinuous ommissioning process that also need to be addressed. It is highly recommended that the proposed issues be resolved and the proposed measures be implemented as quickly and as completely as possible to maximize the value of the ontinuous ommissioning of this building, and most importantly, to maximize energy savings and comfort levels in the building. In this way, the Texas A&M University campus can move forward in its quest for energy efficiency, and the ontinuous ommissioning process will have been beneficial in aiding in this endeavor. 12
APPENDIX A HVA AS-BUILT INFORMATION Table A- 1. HW and HHW pumping information. hilled Water System Hot Water System Number of pumps 1 - Pump control source APOGEE - Pump speed control onstant - Pump speed control method - - Bldg Valve control method DT DT Piping system type Two-way onstant speed flow loop with bypass Two-way with bypass ontrol valve type Pneumatic Pneumatic Nameplate GPM 103 - Nameplate Head (ft) 35 - Nameplate HP 2 - UNIT Design Max. Supply FM Table A- 2. HVA system airflow design information. Design Max. OA FM AHU 1 1,130 180 AHU 2 1,450 100 AHU 3 4,710 150 AHU 4 2,700 300 AHU 5 5,380 150 AHU 6 1,190 225 AHU 7 5,640 500 Service area Fuel analysis labs Research lab 108 Research lab 109 onference room, offices, hallway Research lab 110 Instrument lab, restrooms, hallway Research lab 115 Motor HP HW coil GPM HW coil DP HHW coil GPM HHW coil DP ¾ 6 10 2.1 5 1 6 10 1.9 5 3 17.5 10 7.6 5 2 12.8 10 4.7 5 3 19.8 10 8.7 5 ½ 6.5 10 1.9 5 3 24.7 10 9.1 5 AHU 8 3,120 200 Offices, hallway 1½ 12.8 10 5.3 5 AHU 9 2,720 100 otton gin lab 116 1½ 10.2 10 4.4 5 13
Table A - 3. Relief and exhaust fans with their design specifications. MARK SERVIE AREA FM SP in. W.. HP VOLTS/ PH RPM DRIVE NOTES EF-1 Fuel analysis lab 109b 14,000 0.25 2 208/3 375 BELT 1 EF-2 Fuel analysis lab 109d 14,000 0.25 2 208/3 375 BELT 1 EF-3 Restrooms 800 0.25 ¼ 120/1 1,120 BELT 2 EF-4 onference room 1,250 0.25 ¼ 120/1 840 BELT 3 EF-5 Research lab 109 3,000 0.25 ⅓ 120/1 665 BELT 4 EF-6 Research lab 110 3,880 0.25 ¾ 208/3 790 BELT 4 EF-7 Research lab 115 9,400 0.25 2 208/3 640 BELT 4 EF-8 otton gin lab 116 4,140 0.25 ¾ 208/3 835 BELT 4 EF-9 Notes: Hydraulic equipment room 2,500 0.125 ¼ 120/1 1.140 DIRET 1. The two 14,000 cfm exhaust fans have their own outside air dampers that open automatically when the fans are running. 2. Runs continuously. 3. Not used anymore. 4. Lab overhead door stays open when this fan is running. A H Figure A - 1. AHU-1 schematic diagram. 14
A H Figure A - 2. AHU- 3, 5, 6, 7, & 9 schematic diagram. A H Figure A - 3. AHU-2, 4, & 8 schematic diagram. 15
Figure A - 4. HW pump schematic diagram. Figure A - 5. HHW pump schematic diagram. 16
APPENDIX B FIELD MEASUREMENT REORDS 1 OA 2 3 4 5 H 6 9 8 7 11 12 13 Figure A - 6. AHU-1 measurements points. Table A - 4. AHU-1 air side measurements. Position 1 2 3 4 5 6 Temp F 78.2 73.5-65.2 62.1 61.9 Press. In. W.G. 0-0.01-0.22-0.63-0.73 0.16 FM 20 - - - - 1065 Design FM 180 - - - - 1130 Service area Rooms 109a, 109b, 109c, & 109d Table A- 5. AHU-1 water side measurements. 7 8 9 10 11 12 Valve in control Valve 100% open 50.5 50 44.5 39 37 NA 51 50.5 44.5 38 38 NA 17
OA 1 2 3 4 5 H 6 7 RA 10 9 8 11 12 13 Figure A - 7. AHU-2 measurements points. Table A- 6. AHU-2 air side measurements. Position 1 2 3 4 5 6 7 Temp F 82.4-71.8-64.4 63.3 62.6 Press. In. W.G. -0.09 - -0.07-0.2-0.55-0.59 0.14 FM 217 - - - - - 1125 Design FM 100 - - - - - 1450 Service area Room 108 Table A- 7. AHU-2 water side measurements. 8 9 10 11 12 13 Valve in control Valve 100% open 49.5* NA 47.5* 41 NA 41 49.5 NA 47.5 41 NA 41 * ontrol signal to valve was 15 psi (full open position) when testing. 18
1 OA 2 3 4 5 H 6 9 8 7 11 12 13 Figure A - 8. AHU-3 measurements points. Table A- 8. AHU-3 air side measurements. Position 1 2 3 4 5 6 Temp F 94.3 75.4-49.5 55 - Press. In. W.G 0-0.001-0.007-0.022-1.35 0.001 FM 8 - - - - 605 Design FM 150 - - - - 4710 Service area Room (lab) 109 Table A- 9. AHU-3 water side measurements. 7 8 9 10 11 12 Valve in control Valve 100% open 51.5* 48.5* 43.5* 40.5 40.5 36.5 51.5 48.5 43.5 40 39.5 39 * ontrol signal to valve was 15 psi (full open position) when testing. 19
OA 1 2 3 4 5 H 6 7 RA 10 9 8 11 12 13 Figure A - 9. AHU-4 measurements points. Table A- 10. AHU-4 air side measurements. Position 1 2 3 4 5 6 7 Temp F 84-75.8-62.6 65.1 65.2 Press. In. W.G. -0.08 - -0.27-0.35-0.84-0.95 0.30 FM 234 - - - - - 2510 Design FM 300 - - - - - 2700 Service area Rooms 101, 102, 103, 104, 105, 106, 107, & hallway north Table A- 11. AHU-4 water side measurements. 8 9 10 11 12 13 Valve in control Valve 100% open 51.5* 48.5* NA 42 42 39.5 50.5 48.5 NA 40 39.5 38.5 * ontrol signal to valve was 16 psi when testing. 20
1 OA 2 3 4 5 H 6 9 8 7 11 12 13 Figure A - 10. AHU-5 measurements points. Table A- 12. AHU-5 air side measurements. Position 1 2 3 4 5 6 Temp F 75.7 72.2-63.3 60.2 55.4 Press. In. W.G -0.001-0.01-0.11-0.35-0.5 0.3 FM 13 - - - - 4780 Design FM 150 - - - - 5380 Service area Room (lab) 110 Table A- 13. AHU-5 water side measurements. 7 8 9 10 11 12 Valve in control Valve 100% open 50.5* 48.5* NA 42 42 39.5 50.5 48.5 NA 40 39.5 38.5 * ontrol signal to valve was 16 psi (full open position) when testing. 21
1 OA 2 3 4 5 H 6 9 8 7 11 12 13 Figure A - 11. AHU-6 measurements points. Table A- 14. AHU-6 air side measurements. Position 1 2 3 4 5 6 Temp F - 99.3 81 67.1 66.9 68.3 Press. In. W.G -0.001 - -0.07-0.27-0.29 0.10 FM 178 - - - - 900 Design FM 225 - - - - 1190 Service area Instrument lab 114, restrooms, & east side of middle corridor Table A- 15. AHU-6 water side measurements. 7 8 9 10 11 12 Valve in control Valve 100% open 55* NA 43* 42 NA 38 44 NA 42 42 NA 40 * ontrol signal to valve was 11 psi when testing. 22
1 OA 2 3 4 5 H 6 9 8 7 11 12 13 Figure A - 12. AHU-7 measurements points. Table A- 16. AHU-7 air side measurements. Position 1 2 3 4 5 6 Temp F 76.6-73.6 58.8 61.5 62.8 Press. In. W.G -0.01-0.02-0.21-0.36-1.05 0.05 FM 32 - - - - 3700 Design FM 500 - - - - 5640 Service area Room (lab) 115 Table A- 17. AHU-7 water side measurements. 7 8 9 10 11 12 Valve in control Valve 100% open 53* 52.5* 41* 40 40 38 50 48 42.5 40 39 39 * ontrol signal to valve was 13 psi when testing. 23
OA 1 2 3 4 5 H 6 7 RA 10 9 8 11 12 13 Figure A - 13. AHU-8 measurements points. Table A- 18. AHU-8 air side measurements. Position 1 2 3 4 5 6 7 Temp F 85.7-74.8-60.2 56.3 54.8 Press. In. W.G. -0.02 - -0.03-0.06-0.22-0.83 0.11 FM 90 - - - - - 2100 Design FM 200 - - - - - 3120 Service area Rooms 117a, 118, 118a, 119, 120, 121, 122, 123, 125, 126, 127, vestibule, hallway south, & west side of hallway east Table A- 19. AHU-8 water side measurements. 8 9 10 11 12 13 Valve in control Valve 100% open 53* 44.5* 40 39.5 40 38 53 44.5 40 39.5 38.5 38 * ontrol signal to valve was 18 (full open position) psi when testing. 24
1 OA 2 3 4 5 H 6 9 8 7 11 12 13 Figure A - 14. AHU-9 measurements points. Table A- 20. AHU-9 air side measurements. Position 1 2 3 4 5 6 Temp F - - 72.5 53.6 62.7 63.2 Press. In. W.G -0.001-0.03-0.17-0.6-0.63 0.95 FM 45 - - - - 2330 Design FM 100 - - - - 2720 Service area Room (lab) 116 Table A - 21. AHU-9 water side measurements. 7 8 9 10 11 12 Valve in control Valve 100% open 53* 51* 40* 40 40 37 52 43 40 39 38 37 * ontrol signal to valve was 10.5 psi when testing. 25
Unit Table A - 22. Measured HVA system airflow information. Service Measured supply cfm Design supply cfm Measured OA cfm Design OA cfm AHU-1 Fuel analysis labs 1,065 1,130 20 180 AHU-2 Research lab 108 1,125 1,450 217 100 AHU-3 Research lab 109 605 4,710 8 150 AHU-4 onference room, offices, hallway 2,510 2,700 234 300 AHU-5 Research lab 110 4,780 5,380 13 150 AHU-6 Instrument lab, restrooms, hallway 900 1,190 178 225 AHU-7 Research lab 115 3,700 5,640 32 500 AHU-8 Offices, hallway 2,100 3,120 90 200 AHU-9 otton gin lab 116 2,330 2,720 45 100 Table A - 23. omfort baseline measurements on 06/06/2007. Room Temperature ( F) Relative Humidity (%) O 2 Level (ppm) Outside 85.1 58.7 366 100 72.7 61 422 103 71.8 63.2 422 105 68.7 68 375 East hallway 73.8 60 463 108 70.3 67.6 420 109 75.5 52.3 455 109 74.1 60 464 110 73.4 57.4 471 115 74 61.2 414 116 72.8 58.8 387 124 73.7 55.1 496 North hallway 70.2 66.2 402 South hallway 71.3 54.8 429 26
AHU-1 AHU-2 AHU-3 AHU-4 AHU-5 50 50.5 47.5 49.5 48.5 51.5 48.5 51.5 54 54 44.5 NA 43.5 NA 42 AHU-6 AHU-7 AHU-8 AHU-9 NA 50 52.5 53 44.5 53 51 53 42 41 40 40 HW supply HW return Figure A - 15. hilled water loop pressure profile at onset of. 27
AHU-1 AHU-2 AHU-3 AHU-4 AHU-5 37 39 NA 41 40.5 40.5 42 42 40 40 NA 41 36.5 39.5 39 AHU-6 AHU-7 AHU-8 AHU-9 NA 42 40 40 40 40 40 40 38 38 38 37 HHW supply HHW return Figure A - 16. Hot water loop pressure profile at onset of. 28
APPENDIX PRE- ONTROL SETTINGS Main air Room temp. sensor PXP EP EP OA damper HWV HHWV Actuator Figure A - 17. Valve control schematic diagram. 29
APPENDIX D PRE- ONTROL PROGRAMMING Texas A&M University Panel PPL Report Field Panels: AG RESEARH 1508 Node 01, AG RESEARH 1508 Node 02 Programs: * Line Range: 1-32767 Panel System Name: AG RESEARH 1508 Node 01 Program Name: AGRES.AH1.PGM ET 10 AIR HANDLER 1 PROGRAM ET 20 IF("AGRES.AH1O") THEN GOTO 60 E 30 OFF("AGRES.AH1SS") E 40 SET(0,"AGRES.AH1VLV") E 50 GOTO 80 ET 60 ON("AGRES.AH1SS") ET 70 LOOP(0,"AGRES.AH1SPT","AGRES.AH1VLV","AGRES.AH1STSP",1000,20,0,1,50,0,100,0) ET 80 GOTO 10 Panel System Name: AG RESEARH 1508 Node 01 Program Name: AGRES.AH2.PGM ET 10 AIR HANDLER 2 PROGRAM ET 20 IF("AGRES.AH2O") THEN GOTO 60 E 30 OFF("AGRES.AH2SS") E 40 SET(0,"AGRES.AH2VLV") E 50 GOTO 80 ET 60 ON("AGRES.AH2SS") ET 70 LOOP(0,"AGRES.AH2SPT","AGRES.AH2VLV","AGRES.AH2STSP",1000,20,0,1,50,0,100,0) ET 80 GOTO 10 Panel System Name: AG RESEARH 1508 Node 01 Program Name: AGRES.AH3.PGM ET 10 AIR HANDLER 3 PROGRAM ET 20 IF("AGRES.AH3O") THEN GOTO 60 E 30 OFF("AGRES.AH3SS") E 40 SET(0,"AGRES.AH3VLV") E 50 GOTO 80 ET 60 ON("AGRES.AH3SS") ET 70 LOOP(0,"AGRES.AH3SPT","AGRES.AH3VLV","AGRES.AH3STSP",1000,20,0,1,50,0,100,0) ET 80 GOTO 10 30
Panel System Name: AG RESEARH 1508 Node 01 Program Name: AGRES.AH4.PGM ET 10 AIR HANDLER 4 PROGRAM ET 20 IF("AGRES.AH4O") THEN GOTO 60 E 30 OFF("AGRES.AH4SS") E 40 SET(0,"AGRES.AH4VLV") E 50 GOTO 80 ET 60 ON("AGRES.AH4SS") ET 70 LOOP(0,"AGRES.AH4SPT","AGRES.AH4VLV","AGRES.AH4STSP",1000,20,0,1,50,0,100,0) ET 80 GOTO 10 Panel System Name: AG RESEARH 1508 Node 01 Program Name: AGRES.HW.PGM ET 10 HILL WATER PROGRAM ET 30 LOOP(0,"AGRES.HWSRT","AGRES.HWRV","AGRES.HWTSP",600,10,0, 1,100,0,100,0) ET 40 "1508_HWPDT" = "1508_HWSRT" - "1508_HWPST" ET 100 GOTO 10 Panel System Name: AG RESEARH 1508 Node 01 Program Name: AGRES.HWS.PGM ET 10 HOT WATER PROGRAM ET 20 TABLE("AGRES.OADBT","AGRES.HWTSP",40,160,90,120) ET 30 LOOP(128,"AGRES.HWPRT","AGRES.HWRV","AGRES.HWTSP",600,10,0,1,100,0,100,0) ET 40 "1508_HWPDT" = "1508_HWSST" - "1508_HWPRT" ET 100 GOTO 10 Panel System Name: AG RESEARH 1508 Node 01 Program Name: 1508_BLN HEK ET 10 --- BLN HEARTBEAT HEK FOR AMPUS OAT -- ET 1000 IF("AMPUS_1508.BLNHK".EQ. 0) THEN SET(1,"AMPUS_1508.BLN HK") ET 10000 GOTO 10 Panel System Name: AG RESEARH 1508 Node 02 Program Name: AGRES.AH5.PGM ET 10 AIR HANDLER 5 PROGRAM ET 20 IF("AGRES.AH5O") THEN GOTO 60 E 30 OFF("AGRES.AH5SS") E 40 SET(0,"AGRES.AH5VLV") E 50 GOTO 80 ET 60 ON("AGRES.AH5SS") ET 70 LOOP(0,"AGRES.AH5SPT","AGRES.AH5VLV","AGRES.AH5STSP",1000,20,0,1,50,0,100,0) 31
ET 80 GOTO 10 Panel System Name: AG RESEARH 1508 Node 02 Program Name: AGRES.AH6.PGM ET 10 AIR HANDLER 6 PROGRAM ET 20 IF("AGRES.AH6O") THEN GOTO 60 E 30 OFF("AGRES.AH6SS") E 40 SET(0,"AGRES.AH6VLV") E 50 GOTO 80 ET 60 ON("AGRES.AH6SS") ET 70 LOOP(0,"AGRES.AH6SPT","AGRES.AH6VLV","AGRES.AH6STSP",1000,20,0,1,50,0,100,0) ET 80 GOTO 10 Panel System Name: AG RESEARH 1508 Node 02 Program Name: AGRES.AH7.PGM ET 10 AIR HANDLER 7 PROGRAM ET 20 IF("AGRES.AH7O") THEN GOTO 60 E 30 OFF("AGRES.AH7SS") E 40 SET(50,"AGRES.AH7VLV") E 50 GOTO 80 ET 60 ON("AGRES.AH7SS") ET 70 LOOP(0,"AGRES.AH7SPT","AGRES.AH7VLV","AGRES.AH7STSP",1000,20,0,1,50,0,100,0) ET 80 GOTO 10 Panel System Name: AG RESEARH 1508 Node 02 Program Name: AGRES.AH8.PGM ET 10 AIR HANDLER 8 PROGRAM ET 20 IF("AGRES.AH8O") THEN GOTO 60 E 30 OFF("AGRES.AH8SS") E 40 SET(0,"AGRES.AH8VLV") E 50 GOTO 80 ET 60 ON("AGRES.AH8SS") ET 70 LOOP(0,"AGRES.AH8SPT","AGRES.AH8VLV","AGRES.AH8STSP",1000,20,0,1,50,0,100,0) ET 80 GOTO 10 Panel System Name: AG RESEARH 1508 Node 02 Program Name: AGRES.AH9.PGM ET 10 AIR HANDLER 9 PROGRAM ET 20 IF("AGRES.AH9O") THEN GOTO 60 E 30 OFF("AGRES.AH9SS") E 40 SET(0,"AGRES.AH9VLV") E 50 GOTO 80 ET 60 ON("AGRES.AH9SS") ET 70 LOOP(0,"AGRES.AH9SPT","AGRES.AH9VLV","AGRES.AH9STSP",1000,20,0,1,50,0,100,0) ET 80 GOTO 10 *************************** End of Report **************************** 32