Civil Engineering Building

Continuous Commissioning Report For the Civil Engineering Building Building 492 Submitted to: Utilities Energy Office Physical Plant Department Texas A&M University Prepared by: Energy Systems Laboratory March 15, 2006

Executive Summary The building assessed in this report is the Civil Engineering building. It is a 2-story building plus a basement consisting of offices, labs, and classrooms located on the main campus of Texas A&M University. The HVAC system is a single duct VAV system with terminal reheat, which incorporates 12 air handling units, 38 terminal units, 8 exhaust fans, and 5 supply fans. The chilled water system is two-way with a 10 hp pump motor running at a constant speed; the bypass valve has been removed. The heating water system is also two-way with a 5hp pump motor which runs at constant speed with the bypass valved off. A combination of pneumatic and Siemens DDC systems operate the building equipment. The continuous commissioning measures that were implemented include: 1) extension of the unoccupied mode of operation during nights, 2) a night reset of static pressure for the operation of air handler units TA-1B and TA-2A, 3) shut down of TA-B8 during unoccupied times, 4) resetting valve operating pressures for all basement air handling units, and 5) modified outside air (OA) intake to improve CO 2 levels. These measures were implemented in the time period between February and March, 2006. Furthermore, several measures are proposed that have yet to be implemented: 1) replace the control valve, repair the differential pressure sensor and install a variable frequency drive (VFD) on the building chilled water system to allow lower chilled water differential pressure set points during periods of low load, 2) open heating water bypass to decrease building heating water usage during low heating demand and control the building heating loop based on temperature, 3) install control hardware and programming for control of AHU-2, 4) replace the heating water valves on TAB4 and zone 3 of TA-B6 (these valves are not closing completely resulting in excess heating water usage), and 5) the CO 2 readings gathered indicate that portions of the first and second floor were receiving inadequate outside air. Subsequent investigation found the outside air intake grill to TA- 1A was clogged and the linkage to TA-1B outside air damper is broken. Additionally, the TA-2A outside air duct filters were completely clogged which allowed only minimal air flow. It is recommended that these measures will be implemented to maximize the amount of savings that can be achieved and complete this phase of the continuous commissioning process for this building. The comfort issues which were observed and discussed during the kick-off meeting included occupant complaints of being too cold during cooling periods and too hot during heating periods. These complaints hold true throughout the building, except in the computer labs where the highest heat loads are found and dirty coils cause year round comfort problems.

Acknowledgements The Continuous Commissioning (CC ) process detailed in this report was a collaborative effort among the Energy Office, 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 CC 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 Energy Office, and primarily details the CC activities and measures in which the Energy Systems Laboratory has been involved. For information concerning the Office of Energy Management please contact Homer L. Bruner, Jr. at (979) 458-2800. The lead CC investigator for this building was Arthur Stringer. For additional information regarding the information in this report or the overall Continuous Commissioning program at the Energy Systems Laboratory, please contact Song Deng at (979) 862-1234. i

Table of Contents I. Introduction... 1 II. Facility Information... 1 A. General Building Description... 1 B. HVAC Description... 2 III. Continuous Commissioning Activities... 5 A. Existing Building Conditions (Pre-CC)... 5 1. Existing HVAC Conditions... 6 2. Existing Comfort/Indoor Air Quality Conditions... 7 3. Existing HVAC control... 8 B. Continuous Commissioning Measures... 9 1. Implemented Measures... 9 2. Proposed Measures... 10 IV. Requested Action... 12 V. Building Comfort Improvements... 13 VI. Savings Analysis... 13 VII. Retrofit Recommendations... 14 VIII. Conclusions... 14 Appendices... 15 ii

List of Figures and Tables Figure 1: Civil Engineering Building.... 1 Figure 2. Civil Engineering Building location... 2 Table 1. Building chilled and heating water information.... 3 Table 2. Fan Schedule... 4 Table 3. AHU design information.... 5 Table 4. Measured AHU system airflow information.... 7 Table 5. Comfort measurements performed in the building... 8 Table 6. Summary of implemented CC measures in building... 9 Table 7. Summary of example potential savings for TA-B2... 10 Table 8. AHU valve measurements and adjustments.... 10 Table 9. Summary of proposed CC measures that have not been implemented in the building and their estimated potential savings... 11 Table 10. CFM Measurements taken on AHU-2A... 13 iii

I. Introduction Since 1997, more than 70 TAMU - College Station buildings have been commissioned, resulting in energy savings to the University of millions of dollars. For the fiscal year 2006, 25 buildings (totaling 2.5 million square feet) have been identified to be commissioned, of which the Civil Engineering building is the tenth. This building was identified as a prime candidate due to its high energy cost per square foot and frequent comfort problems. Commissioning began in February, 2006 and was completed in March, 2006. This report will document the measures implemented and recommended during this commissioning. II. Facility Information A. General Building Description Figure 1: Civil Engineering Building. 1

Figure 2. Civil Engineering Building location. The Civil Engineering building, pictured above in Figure 1, was constructed in 1937 and is located on the main campus of Texas A&M University at the location shown in Figure 2 above. It is home to the Civil Engineering department and consists primarily of offices, classrooms, and labs. The building has 2 floors and a basement for a total area of 56,537 square feet. It is generally occupied from 8:00AM to 10:00 PM with computer labs open 24/7. The building underwent a major renovation in June 1983. B. HVAC Description The building s chilled water system utilizes one 10 hp, 340 GPM pump. The control valve, which is currently disconnected, is pneumatically controlled with the signal converted to digital for Siemens control. Siemens operates this valve based upon the differential pressure of the secondary supply and return piping. The piping system is two-way constant speed flow without a bypass. The heating water system utilizes one 5 hp, 145 GPM pump. The heating water control valve is also pneumatic with signal converted to digital and is controlled based upon differential pressure. The piping system is two-way constant speed flow with bypass. The bypass valve is currently valved off. A summary of the building information is shown below in table 1. 2

Table 1. Building chilled and heating water information. CW System HW System Number of pumps 1 1 Pump speed control Constant Constant Bldg Valve control method DP DP Piping system type Two-way constant speed flow loop without bypass Two-way constant speed flow loop with bypass which is valved off Control valve type Pneumatic to digital Pneumatic to digital Nameplate GPM 340 145 Nameplate Head (ft) 70 80 Nameplate HP 10 5 Nameplate RPM 1775 1775 During the building s last major renovation in 1983, the total design air flow was approximately 67,000cfm, of which 13,225cfm is outside air, which was accomplished by 12 air handling units and 7 fume hood make-up fans. The total design exhaust flow was specified as 7,902 cfm, and was achieved with 7 fume hoods and 4 exhaust fans. Today, the building does not operate as designed with 2 exhaust and 2 supply fans disconnected and four of the five fume hoods exhaust fans seldom used. One of the remaining exhaust fans is utilized by the lavatories and janitor closets. The other has no motor. Table 2 below gives an overview of the units comprising the building s fans with design information. 3

Table 2. Fan Schedule Fan Type Serves HP Intake Exhaust F-1 Fume Hood Room 131 1/6 0 729 F-2 Fume Hood Room 210 1/6 0 729 F-3 Fume Hood Room 133 1/6 0 729 F-4 Fume Hood Room 018A 1/6 0 729 F-5 Fume Hood Room 018B 1/6 0 729 F-6 Fume Hood Room 018D 1/6 0 729 F-7 Fume Hood Make-up Room 133 1/6 520 0 F-8 Fume Hood Make-up Room 131 1/6 520 0 F-9 Fume Hood Make-up Room 210 1/6 520 0 F-10 Fume Hood Make-up Room 018D 1/6 520 0 F-11 Fume Hood Make-up Room 211 1/6 520 0 F-12 Fume Hood Room 211 1/6 0 729 F-13 Fume Hood Room 16 1/6 0 729 F-14 Fume Hood Room 214 1/6 0 729 F-15 Fume Hood Make-up Room 16 1/6 520 0 F-16 Fume Hood Make-up Room 214 1/6 520 0 F-17 Exhaust Lavatories/ Janitorial 1/3 0 2800 F-18 Exhaust Room 25 N/A 0 100 The basement HVAC consists of 8 air handling units. Units TA-B1 thru TA-B5 and TA- B7 and TA-B8 are constant volume single zone units with heating and chilled water being couple controlled by pneumatic actuators. Unit TA-B2 has a three-way chilled water piping system. The eighth unit, TA-B6, is also a constant speed unit with 4 zones utilizing bypass dampers and reheat coils in each zone. The chilled water valve is controlled independently. All basement air handling units have TEC space sensors. The space in Lecture hall 110 is conditioned by AHU-2 which operates on local 4

pneumatic control. The thermostat hangs by a wire in the return air chase and there is no control for the outside air damper. The remainder of the first floor and the second floor units are single duct VAV with reheat. These areas are served by 3 air handling units, TA-1A, TA1B and TA-2A. Each unit is commanded by a static pressure controlled VFD supplying air to 38 pneumatic controlled terminal boxes. The terminal boxes are governed by pneumatic thermostats. Table 3 below gives an overview of the units comprising the building s fans with design information. Table 3. AHU design information. Unit Function Service Supply cfm OA cfm TA-B1 Supply Basement 22600 1000 TA-B2 Supply Basement 2380 460 TA-B3 Supply Basement 610 61 TA-B4 Supply Basement 610 61 TA-B5 Supply Basement 1293 130 TA-B6 Supply Basement 4948 494 TA-B7 Supply Basement 1819 182 TA-B8 Supply Basement 3406 341 TA-1A Supply 1st Floor 13000 1997 TA-1B Supply 1st Floor 8200 894 TA-2A Supply 2 nd Floor 23700 3655 AHU 2 Supply 1 st Floor 5000 1400 III. Continuous Commissioning Activities A. Existing Building Conditions (Pre-CC) The initial IAQ walk-through measurements indicated immediately there were CO 2 problems indicated by high readings on the second floor. Additionally, some corridor areas were very warm while others were breezy and cool. In research areas, diffusers were covered with paper preventing air movement; it was explained that the space was too cold in those areas causing comfort problems. Computer rooms were uncomfortably warm; windows were found to be opened by occupants complaining the air conditioning did not work. Conditioned space temperature readings were not available due to the windows being open with the cool outside climate. Several problems were found in the chilled and heating water pumping systems. The building chilled water control valve is stuck open and the temperature and differential pressure sensors have failed. As noted previously, the chilled water building bypass line 5

and valve have been removed while the pump is run at constant speed. Two bypass valves are located on air handling units TA-2A and TA-B2 prevent dead-heading of the pump. The heating water system also has a failed differential pressure sensor. The manual heating water building bypass valve has been closed while the pump is still constant speed. 1. Existing HVAC Conditions Measurements and observations taken indicated several problems with the air handling units: o TA-1A was not maintaining the static pressure set point of 1.0 W.C. and the unit s VFD was running at a 34% speed, indicating a control problem. o The measurements taken of the couple controlled actuators indicated the operation ranges on some were too close for best operation and two air handling units had the actuators with control ranges which were overlapping causing simultaneous use of both heating and chilled water. A complete list of values for coupled control actuators can be found in Table 7, page 10, along with their corrected ranges. o The measurements taken showed also that heating water valves on TA-B4 and zone 3 of TA-B6 are not fully closing. o AHU-2 has no EMCS to regulate the unit s use. This unit is running 24/7 in lecture room 110 which is only used 8:00 a.m. to 5:00 p.m. daily. o Outside air damper actuator linkage is broken at TA-1B. The measured air handling unit system information is summarized below in Table 4. 6

Table 4. Measured AHU system airflow information. Building Name: Civil engineering Total Area: 56,537 ft^2 Unit Function Service Supply Outside Air Note TA-B1 Supply Basement 2100 218* * common return TA-B2 Supply Basement 1960 218* * common return TA-B3 Supply Basement 1210 0 No OA supply TA-B4 Supply Basement 460 198** ** common return TA-B5 Supply Basement 1490 198** ** common return TA-B6 Supply Basement 2822 161 TA-B7 Supply Basement 1545 141 TA-B8 Supply Basement 1835 277 TA-1A Supply 1 st Floor 13500 795 TA-1B Supply 1 st Floor 7660 645 TA-2A Supply 2 nd Floor 7700 1370 AHU 2 Supply 1 st Floor 3430 725 2. Existing Comfort/Indoor Air Quality Conditions As stated, the initial walk through of the building collecting CO 2 and temperature readings indicated that an outside air problem existed within the building. In the basement the CO 2 measurements indicated that there is a surplus of outside air being brought in. The measurements also indicated insufficient ventilation to parts of the 1 st floor and the entire 2 nd floor. Other comfort issues noted in the building included: o The basement east hallway and offices were hot or cold and the temperature poorly controlled. o The first floor west hallway is drafty caused by exiting air from lecture hall 110 o The second floor computer lab rooms 215 and 220 were hot due to dirty coils. o Also, it has been noted that the IT personnel report that all the computer labs remain hot most of the time causing the occupants to open windows. Table 5 below is a summary of the comfort measurements performed in the building during commissioning. 7

Table 5. Comfort measurements performed in the building CIVIL ENGINEERING INITIAL READINGS ROOM # DEG F CO 2 ppm %RH AIR FLOW cfm COMMENTS BASEMENT LAVATORY 73.8 733 33 N/A 11 72.3 773 33 N/A HALL(25) 72.6 750 32 N/A 104 N/A N/A N/A 2025** CALIBRATED THERMOSTAT 110* 72 1184 36 N/A 136* 70.8 1345 37 1275** HALL(139) 70.7 948 35 N/A 203 N/A N/A N/A 1740** 210 70.3 1120 38 1180 215* 73 1350 38 774** 216* N/A N/A N/A 623** 219* 70.5 1177 38 N/A 220 N/A N/A N/A 720** THERMOSTAT BROKEN * Indicates the room was occupied at the time of measurements. ** Testing CFM flow measurements 3. Existing HVAC control The control programming for this building has an unoccupied schedule that starts at 11:45PM and continues to 4:00AM daily. The heating and cooling mode is only based upon outside air temperature. The occupied/unoccupied mode controls the air handling units and outside air dampers. When the program changes heating/cooling mode, the point value changes drastically and creates comfort problems. This causes the unit to flood the areas with hot or cold air causing discomfort in the space. Furthermore, one of the three variable speed air handling units has an unoccupied static pressure reset; the others do not. Nor is there a shut down schedule for the air handling units. And finally, 8

the chilled and heating water pumps are run 24/7 at a constant speed with no valve operation to control water flow, therefore savings is only recognized through electricity reduction at the air handling units. B. Continuous Commissioning Measures To resolve the problems described in the previous section, a number of Continuous Commissioning measures have already been implemented in the building. Due to various reasons other measures are proposed and are awaiting implementation 1. Implemented Measures While measurements were being taken of the air handling units, an observation was made of TA-1A. Although the unit had a VFD, it was not varying to maintain static pressure set point of 1.0 W.C. After further investigation the controller DPV was found to be faulty and was replaced solving this problem. The air handling units have both a heating water valve and a chilled water valve that should function at two different air pressure ranges from a coupled source of control air. The measurements taken of the valve actuators indicated the operation ranges on some were too close for best operation and two units were overlapping causing simultaneous use of both heating and chilled water resulting in a large waste of energy. A summary of these CC measures is listed in table 6 below. Table 6. Summary of implemented CC measures in building. Category CC Measure Result Mechanical Repair controller DPV Electricity savings from VFD operation. Mechanical Mechanical Balance valve operation on TA-B2 and TA-B4. Repair linkage to OA damper on TA-B8 Reduction of heating and chilled water usage, Improve comfort. Control OA air to basement An example of this is TA-B2. The initial valve actuator operating ranges were taken of 4-10 psig for the normally open heating water valve and 2-8 psig for the normally closed chilled water valve. This resulted in the valves operating simultaneously during two thirds of the pressure range. The chilled water flow for this unit is scheduled at 16.3 gal/min and the heating water at 7.7 gal/min. Assuming: 1) chilled water was being called for two-thirds of the year and heating water at the remaining third. 2) When the valve control ranges overlap 50%, there is a chilled water flow of 50% (or 8.15 gpm) and 9

heating water flow of 50% (or 3.85 gpm); and 3) The ΔT of heating water is 20 F and the ΔT of chilled water is 16.2 F. 4) The calculations use scheduled numbers. The resulting waste is indicated in table 7 below. Table 7. Summary of example potential savings for TA-B2 % of time valves overlapped HW MMBTU CHW MMBTU $ USED 25 18.2 62.5 $708.85 50 36.4 124.8 $1,417.72 75 54.6 187.2 $2,126.57 100 72.8 249.6 $2,835.43 Adjustments were made to all of these valve actuators providing a proper operating range to each set. Table 8 summarizes the valve pressure measurements. Table 8. AHU valve measurements and adjustments. Initial operating pressure range Final Pressure Range AHU Chilled water Heating water Initial operating pressure range TA-B1 2-way 12-18 12-18 2-way 4-8 4-8 TA-B2 3-way 2-8 9-15 2-way 4-10 3-8 TA-B3 2-way 11-16 11-16 2-way 4-9 4-9 TA-B4 2-way 3-9 11-16 2-way 4-8 4-8 TA-B5 2-way 11-17 11-17 2-way 4-10 8-10 TA-B7 2-way 11-16 11-16 2-way 4-9 4-9 TA-B8 2-way 11-16 11-16 2-way 3-9 3-9 AHU-2 3-way 10-16 10-16 3-way 4-9 4-9 Final Pressure Range 2. Proposed Measures Several Continuous Commissioning measures are proposed that have not been implemented. Table 9 below is a summary of those measures with an estimation given of how much each measure would save if implemented. Their implementation would complete this phase of Continuous Commissioning for this building, and would correct the remaining problems with building performance. 10

Table 9. Summary of proposed CC measures that have not been implemented in the building and their estimated potential savings. Category CC Measure Purpose AHU Replace heating water valves on TA-B4 and zone 3 of TA-B6 reheat Reduce heating water usage Pumping Install VFD drive on chilled water pump and replace failed sensors Reduce electricity and chilled water usage Open heating water building Pumping AHU Programming Programming Programming Programming bypass Install controls for AHU-2 and add to Apogee Change control program of AHU set points to table Extend unoccupied time schedule Reduce TA-1B and TA-2A night static pressure set point. Shut down TA-B8 Reduce heating water usage Control unit with set-points and scheduling for savings Better comfort control Savings of electricity, heating water and chilled water. Reduced chilled and heating water usage and electric consumption. Reduced chilled and heating water usage and electric consumption. The first proposed measure is to replace the heating water valves on TA-B4 and zone 3 of TA-B6. These valves are not closing completely resulting in excess heating water usage. The second proposed measure is to replace the failed temperature and differential pressure sensors on the chilled water pumping system. It is recommended to follow this with installation of a VFD drive for the pumping motor. This will allow for a reduction in chilled water usage and electricity during low load time and during night modes. The third proposed CC measure is to replace the differential pressure sensor and open the building heating water bypass valve. By opening the bypass, the return valve can be modulated to control the amount of heating water used from the campus loop based upon ΔP. This will show cost reduction even without the installation of a VFD. The fourth proposed measure is to install control hardware for air handling unit 2 and add this unit to Apogee. Currently, the unit operates 24/7, yet the space it serves is only occupied weekdays 8:00 a.m. to 5:00 p.m. With the added controls, unit 2 can be added to the occupancy schedule and allow shutdown during nights and weekends creating savings. The fifth proposed measure is to change the basement air handling unit temperature set points. They are being changed based on weather conditions and a time schedule. This 11

change was causing comfort problems due to abrupt changes in the supply temperature when the external temperature changed. A table within the control program to use more incremental temperature changes provides better comfort. This would resolve the hot and cold issues in the basement areas. The last 3 proposed measures are: 6) to reduce energy levels, the extension of the unoccupied time schedule from 11:45PM through 4:00AM should be extended to 10:00PM through 6:00AM. 7) the static pressure set point for units TA-1B and TA-2A should be reset during this time and finally, 8) TA-B8 can be shut down, again to provide economic savings without affecting comfort levels. IV. Requested Action In order to maximize the performance of the building and its potential energy savings, it is requested that a number of maintenance and controls issues be addressed in the building. These include issues that need resolving in order to implement the proposed Continuous Commissioning measures, as well as general deferred maintenance issues. To be able to implement the proposed measure to optimize the outside air intake, the outside air intake grills need cleaning and the filters need to be replaced. Also, the damper actuator to the outside air intake at TA-1B needs to be repaired. AHU-2 should have the thermostat moved from hanging in the return air to a location in room 110. To maximize air flow in the trouble spots the reheat coils in the VAV terminal boxes in rooms 215 and 216 need cleaning and airflow calibrated. Air flows were measured for TA-2A serving these rooms. At the time of the measurements the VFD was operating at 34 Hz. This is approximately 57% of full capacity. As indicated by the results shown in table 10, rooms 215 and 216 measurement show a significantly lower readings than those obtained in room 210 which has significantly higher measurements at the controlled static pressure. The results of the CFM measurements support the conclusion that the reheat coils are clogged in rooms 215 and 216. Additionally, all other boxes in the building should be checked. Furthermore, the thermostat in room 220 needs to be replaced. 12

Table 10. CFM Measurements taken on AHU-2A AHU-2A DIFFUSER CFM MEASUREMENTS DESIGN ROOM CFM MEASURED CFM 57% OF DESIGN 215 590 174 336 215 590 214 336 215 590 201 336 215 590 185 336 216 615 173 350 216 615 175 350 216 615 157 350 216 615 118 350 210 465 320 265 210 465 150 265 210 465 360 265 210 465 350 265 Moreover, some measures are recommended to possibly reduce future comfort problems and increase energy efficiency. Check bearings on blower at air handler unit 1A. Chilled water valves at air handler units TA-B1 and TA-B8 are leaking at stems. V. Building Comfort Improvements As mentioned earlier, one of the primary objectives of Continuous Commissioning is to improve occupant comfort levels in buildings. As noted, some of the major comfort issues that this building experienced before commissioning included high CO 2 readings, basement east hallway and offices hot or cold, first floor west hallway windy, second floor room 215 hot, and lab 220 hot. It is recommended that the mechanical issues previously mentioned be addressed to provide the completion of the CC measures outlined within this document. This will not only provide better comfort conditions for the building occupants but will provide the University with economic savings in the future. VI. Savings Analysis At this point in the commissioning process, post-cc data is unavailable and thus savings cannot be determined. These values will be given at a later date by the ESL data analysis group. 13

Estimated savings analysis is incomplete at the time of this report s submission. VII. Retrofit Recommendations After assessing the building, we recommend a retrofit of DDC control to AHU-2 and the outside air intake damper. The unit is located in room 222A and serves room 110 lecture hall. Additionally, it is recommended that the return air duct and the outside air duct be connected directly to the units return air grill for better control of mixed air to the area. The purpose of this is to have control to the unit for better comfort purposes and the ability to regulate the equipment s operation for energy savings. This measure will resolve the unwanted draft in the first floor west wing and contribute toward a stable air temperature throughout the first floor. The cost of this retrofit is estimated at $3000.00 and would produce a simple payback of 3 years. VIII. Conclusions The Civil Engineering Building has been a part of the A&M system since 1937. High energy consumption and comfort problems in the building made it a good candidate for Continuous Commissioning. The process was performed in a period of two months. It is believed that the measures that have been implemented up to this time will save energy costs, in addition to improving comfort in the building. Additionally, a major retrofit of the DDC controls for AHU-2 is recommended. Increased 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 issues have been identified that need to be addressed in order that the proposed Continuous Commissioning measures be able to be implemented. An additional list of deferred maintenance issues that need to be resolved has been generated. It is recommended that the proposed issues be resolved and the proposed measures be implemented to maximize the value of the Continuous Commissioning 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 Continuous Commissioning process will have been beneficial in aiding in this endeavor. 14

Appendices 15

Appendix A: Summary of requested actions needed before implementing proposed CC measures. Requested Action Related CC Measure Status Replace AO Filters Optimize OA intake schedule. Pending Clean OA intake louvers on all units Optimize OA intake schedule. Pending TA-1B room OAD in need of repair Optimize OA intake schedule. Pending VAV boxes serving rooms 215 and 216 need cleaning Optimize air flow Pending Replace thermostat in room 220 Optimize air balance Pending Replace frozen CHW control Valve CHW use optimization Pending TA-B1 HW 2 way N.O. valve leaking by Optimize AHU efficiency Pending TA-B2 NC 3 way CHWV wrong control range Optimize AHU efficiency Completed TA-B4 Replace HWV, Leaking through Optimize AHU efficiency Pending AHU-2 Move thermostat from ductwork to classroom Optimize AHU efficiency Pending AHU-2 Return air grill clogged Optimize AHU efficiency Pending Install controls to AHU-2 located in Rm. 222A serving 110 lecture hall Optimize AHU efficiency Pending Install controls to OAD at AHU- 2 Optimize OA intake schedule. Pending Calibrate all terminal box thermostats Optimize AHU efficiency Pending Repair CHWS temp sensor. Optimize chilled water system. Pending Install VFD to CHW pump Optimize chilled water system Pending Replace HW DP sensor. Optimize heating water system. Pending Install VFD to HW pump Optimize heating water system Pending 16

Appendix B: Diagrams & Measurements AHUs B1, B2, B3, B4, B5, B7, B8, 2 Return Air Filter 1 2 Supply Air Fan C H C C 3 Discharge B1 Temperature RH Pressure Velocity Duct Size Flow Location ( F) % in.h2o fpm (L x W) CFM Comments 1 (RA) 68.8 37.2 0.002 660 21.5X5 591 2 (MA) 68.8 37.2 0.002 660 21.5X5 591 3 (SA) 76.2 70.3 N/A N/A N/A 2100 4 (OA) 42.4 82.7 0.008 291 21.5X5 735 B2 Temperature RH Pressure Velocity Duct Size Flow Location ( F) % in.h2o fpm (L x W) CFM Comments 1 (RA) 68.5 38 0.004 1100 29.5X4.5 1014 2 (MA) 68.5 38 0.004 3 (SA) 52.1 70.3 N/A N/A N/A 1960 4 (OA) 42.4 82.7 0.008 291 21.5X5 735 B3 Temperature RH Pressure Velocity Duct Size Flow Location ( F) % in.h2o fpm (L x W) CFM Comments 1 (RA) 70.3 36.1 0.008 456 24x16 1330 2 (MA) 71.3 34.9 0.004 3(SA) 71.3 34.9 0.004 3170 11x8 1210 4 (OA) 42 80 198.6 17

B4 Location Temperature RH Pressure Velocity Duct Size Flow Comments ( F) % in.h2o fpm (L x W) CFM 1 (RA) 68.4 35.9 0.002 245 22X6 * 2 (MA) 69.8 35.8 0.003 640 3 (SA) 63.6 45.1 1465 8X11 460 4 (OA) B5 Temperature RH Pressure Velocity Duct Size Flow Location ( F) % in.h2o fpm (L x W) CFM Comments 1 (RA) 69.8 37.2-0.001 200 31X9.5 * 2 (MA) 3 (SA) 62.7 46.9-0.002 2300 11X19 1490 4 (OA) 42 80 ** open B7 Temperature RH Pressure Velocity Duct Size Flow Location ( F) % in.h2o fpm (L x W) CFM Comments 1 (RA) 65.7 37.8 0.003 310 16X16 551 2 (MA) 62.5 42.3 0.002 500 38X24 3166 3 (SA) 60.2 45.4 0.002. 1600 11X20 1545 4 (OA) 141 B8 Temperature RH Pressure Velocity Duct Size Flow Location ( F) % in.h2o fpm (L x W) CFM Comments 1 (RA) 2 (MA) 67.9 38.8-0.001 1000 38X32 8444 3 (SA) 68.2 39.5-0.001 600 40X38 1835 4 (OA) 277 2 Location Temperature RH Pressure Velocity Duct Size Flow Comments ( F) % in.h2o fpm (L x W) CFM 1 (OA) 43.2 81 810 2 (RA) 2950 3 (MA) 18

AHU-B6 RA Zone 1 Zone 2 Zone 3 Zone 4 OA 2 C H SA H H H 1 3 4 5 C C 6 7 8 9 10 B6 Temperature RH Pressure Velocity Duct Size Flow Location ( F) % in.h2o fpm (L x W) CFM Comments 1 (OA) 62.3 161 2 (RA) 72 N/A 3 (MA) 69.6 4 5 6 55.6 7 (Zone 1) 60.3 0.153 20X12 1070 8 (Zone 2) 60.3 0.785 12X18 1120 9 (Zone 3) 63.9 0.265 770 5X19 785 10 (Zone 4) 60.1 0.164 7X31 810 AHUs 1A, 1B, 2A RA Fresh Air 1 Filter Supply Air Fan 2 C C 3 4 5 6 Discharge 19

1-A Temperature RH Pressure Velocity Duct Size Flow Location ( F) % in.h2o fpm (L x W) CFM Comments 1 (OA) 57 88 975 2 (RA) 71.4 50 3 (MA) 68.4 4 5 6 54.4 13500 1-B Location Temperature RH Pressure Velocity Duct Size Flow Comments ( F) % in.h2o fpm (L x W) CFM 1 (OA) 61.1 96.9 0.004 810 10X11 2 (RA) 68.8 65.4 0.003 770 31X12(X2) 3 (MA) 68.7 66.8 0.003 280 78X36 4 5 6 56.2 98.1 0.001 1100 40X16 7660 2-A Location Temperature RH Pressure Velocity Duct Size Flow Comments ( F) % in.h2o fpm (L x W) CFM 1 (OA) 62.3 96.8 0.003 200 22X15 1370 2 (RA) 70.8 63.4 0.001 550 110X25 3 (MA) 69.9 116X69 4 5 6 54.2 98.6 54X30 7700 20