MEASURED PERFORMANCE DATA FOR

Transcription

1 MEASURED PERFORMANCE DATA FOR HOUSE #4 INVERNESS GARDENS MILLER HOMES FEBRUARY 2013 Submitted to: NYSERDA 17 Columbia Circle Albany, NY Submitted by: HOMEPIC Team CDH Energy Corp. PO Box 641 Cazenovia, NY

2 Monitoring Approach A Campbell CR10x logger was installed to measure the performance of this house on Astilbe Path in Liverpool. The house was essentially unoccupied through May Table 1 lists the measurements that were taken and Figure 1 shows each point location in the system. Data collection started in late December 2011 and Continued through February TWC TWH Mixing Valve Space Heating Pump SRP Mixing Valve Space Heating Loop TWS TSHW Return/ Space Air TSHR TSHM Heating Coil Fan W Tankless Heater SDHW Solar Tank Ventilation Damper SV TSHS Outdoor Air Supply Air Figure 1. Schematic of System with Sensor Locations CDH Energy Corp. 1 February 2013

3 Table 1. Measured Points at Inverness Gardens House No. Label Monitored Points Channel Instrument/Meter Eng. Units 1 SRP Space Heating Pump Status/Runtime C6 Current Switch minutes 2 SDHW DHW Status/Runtime C7 Current Switch minutes 3 SV Fresh Air Ventilation Damper C8 Current Switch minutes 4 W Power MUX 1 Wattnode Power Meter kwh 5 WT Total House Power MUX 2 Wattnode Power Meter kwh 6 WAC A/C Power MUX 3 Wattnode Power Meter kwh 7 FDHW Hot Water Flowrate P1 1/2" Pulse Flow Meter gal 8 TWC Temperature Cold Water In SE2 Thermocouple F 9 TWH Temperature DHW Hot Water Out SE3 Thermocouple F 10 TWS Temperature Solar Tank Out SE4 Thermocouple F 11 TSHW Temperature Space Heating Hot Water In SE5 Thermocouple F 12 TSHM Temperature Space Heating MIXED Air SE6 Thermocouple F 13 TSHS Temperature Space Heating SUPPLY Air SE7 Thermocouple F 14 TSHR Temperature Space Heating RETURN/SPACE SE8 Thermocouple F 15 VBAT Battery Voltage V 16 TREF Reference Thermistor Temperature SE1 Thermistor C The measured power use is summarized in Table 2 and shown Figures 2, 3 and 4. Total power use was about 400 to 600 kwh per month once the house was occupied staring in June Hot water use was about gallons per day. The fan ran periodically throughout the year to provide ventilation. The total power for cooling was only 140 kwh for the 2012 cooling season, while fan power was about 450 kwh for the year (ranging from 25 kwh to 60 kwh per month once the controls were commissioned). Table 2. Summary of Measured Energy and DHW Use Total Power (kwh) Power (kwh) AC Power (kwh) DHW Use (gal/day) Data Collected Jan % Feb % Mar % Apr % May-12 58% Jun-12 93% Jul % Aug % Sep % Oct % Nov % Dec % Jan % Feb-13 14% Notes: Data were lost from May 19 to June 2 because we were not able to gain access to the house From October 5 28, 2012 the datalogger was unplugged by the HVAC technician so no power data was collected CDH Energy Corp. 2 February 2013

4 Utility bill data were only available for the early part of 2012 before the house was occupied (Table 3). We used a combination of the metered data and water heater runtime to predict some of the monthly values under occupied conditions (red data are estimates). Table 4 compares the measured data to the RemRate data. Table 3. Annual Electric and Gas Use for Occupied House Total Electric Use (kwh) Total Gas Use (therms) Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Jan Annual 5, Notes: Red values are estimated Table 4. Comparing REMRate Data to Measured data (broken down by end use) Inverness Gardens (4944 Astible Path Liverpool) REMRATE Results Space Heating (MMBtu/yr) Peak Space Heating (MBtu/h) Fuel for Space Heating (MMBtu/yr) Fuel for Water Heating (MMBtu/yr) Space Ht & Water Ht Fuel (MMBtu/yr) Lights & Appliances (kwh) Relative Fuel Annual Cost Cost Savings Baseline , % $ 1,409 $ Proposed Improvements ,821 37% $ 522 $ 887 As Built Improvements ,606 50% $ 705 $ 704 MEASURED Results Annual Gas Use (from Bills) Annual Electric Use (from Bills) 4,953 CDH Energy Corp. 3 February 2013

5 The equipment runtimes are given in Table 5. The tankless unit runs to provide both space heating and water heating. The ventilation damper is set by the controls to operate about 60% of the time throughout the year. Table 5. Summary of Equipment Runtime in Each Month Unit Runtime (hrs) Htg Pump Runtime (hrs) Vent Damper Runtime (hrs) Data Collected Jan % Feb % Mar % Apr % May-12 58% Jun-12 93% Jul % Aug % Sep % Oct % Nov % Dec % Jan % Feb-13 14% Total Power (kw) Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Jan Feb Total AC Space Temperature (F) Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Jan Feb Figure 2. Power Use for Total House, Fan, and Air Conditioner (January 2012 to February 2013) CDH Energy Corp. 4 February 2013

6 24 Missing Data House Power Power Meters Off Hour of Day Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Jan Feb Day (MAX/MIN = 4.03/ 0.00 kw) Figure 3. Shade Plot Showing Power Use for Total House (January 2012 to February 2013) 2.0 Total Power (kw) January February March April May Total AC Figure 4. Power Use for Total House, Fan, and Air Conditioner (January May, 2012) CDH Energy Corp. 5 February 2013

7 Space Heating Performance The Rheem Tankless unit was originally set to supply water at 133 F. However this was not sufficient to provide space heating to the house. The supply air was only 75 to 80 F. On Jan 15, 2012 the fan speed was slowed down and the supply air temperature increased to about 86 F (fan power decreased from 230 Watts to 118 Watts). However the house was still not maintained at set point temperature as shown by Figure 5 below. Unit 01/10/12 to 01/15/12 Vnt Dmpr Htg Pmp Temperature (F) Supply Air Return Air Mixed Air Water Temperatures 01/10/12 to 01/15/12 Temperature (F) HW to Coil DHW Hot DHW Cold Solar Out Figure 5. System Performance for January 10 15, 2012 CDH Energy Corp. 6 February 2013

8 Total Power (kw) Total Boiler Power is about 450 Watts 0.0 Total AC Fan power is reduced from 230 to 118 Watts Space Temperature (F) Space Set point not maintained Figure 6. Power and Space Conditions for January 10 15, 2012 CDH Energy Corp. 7 February 2013

9 On February 6 the supply water set point was increased to be F to increase the heating capacity of the heating coil in the. This increased the supply air set point to just over 100 F. The system satisfied the space heating set point at this condition (as evidenced by the cycling in Figure 8). Unit 02/05/12 to 02/10/12 Vnt Dmpr Htg Pmp Temperature (F) Supply Air Return Air Mixed Air Water Temperatures 02/05/12 to 02/10/12 Temperature (F) HW to Coil DHW Hot DHW Cold Solar Out Figure 7. System Performance for February 5 10, 2012 CDH Energy Corp. 8 February 2013

10 2.0 Total Power (kw) Total AC Space Temperature (F) 70 Space Set point is maintained Setback each night Figure 8. Power and Space Conditions for February 5 10, 2012 CDH Energy Corp. 9 February 2013

11 Ventilation Controller The data from May show the operation of the Honeywell Controller (fan cycler) which opens the damper (and runs the fan) for 36 minutes out of ever hour (60% of the time) to provide ventilation to the home. When the operated at 230 Watts the measured ventilation flow was 86 cfm, so the average ventilation across the hour was 52 cfm. The 2 3 F fluctuations in the return/space temperature in Figure 10 confirm the cyclic operation of the fan and ventilation damper on May (when no heating was required). Unit 05/10/12 to 05/15/12 Vnt Dmpr Htg Pmp Temperature (F) Supply Air Return Air Mixed Air Water Temperatures 05/10/12 to 05/15/12 Temperature (F) HW to Coil DHW Hot DHW Cold Solar Out Figure 9. System Performance for May 10 15, 2012 CDH Energy Corp. 10 February 2013

12 2.0 Total Power (kw) Total AC Space Temperature (F) Figure 10. Power and Space Conditions for May 10 15, 2012 CDH Energy Corp. 11 February 2013

13 Solar Tank Performance In the summer the solar tank provides a large portion of the hot water heating. However, with the high hot water set point (near 190 F) the tankless unit is still required to operate more than expected. Water Temperatures 08/04/12 to 08/09/12 Temperature (F) HW to Coil DHW Hot DHW Cold Solar Out Unit 08/04/12 to 08/09/12 Vnt Dmpr Htg Pmp Figure 11. Hot Water Temperatures and Equipment Runtimes when Solar Collector is Operating, August 4 9, 2012 CDH Energy Corp. 12 February 2013

14 Air Conditioner Performance The home owner operated the air conditioner intermittently. For the period shown in in Figure 12 below, the AC was activated when the space temperature exceeded 80 F on August 4, For the remainder of that week the set point was F. 2.0 Total Power (kw) Total AC Space Temperature (F) Figure 12. Air Conditioner Operation, August 4 9, 2012 CDH Energy Corp. 13 February 2013