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Hot Water Systems (HWS) Laboratory
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The HWS Laboratory is a facility at the Florida Solar Energy Center (FSEC) - UCF grounds in Cocoa, FL used to test a variety of hot water systems simultaneously side by side. The 160 Sq.ft. metal roof building currently houses seven hot water systems including electric, solar thermal, natural gas and tankless systems. The project is part of the Building America program funded by DOE.
www.baihp.org/hwslab
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The HWS Lab houses a 50-gallon electric tank, differential controlled flat plate collector system w/80 gallon electric assisted tank, 40-gallon Integrated collector system(ICS) backed-up by a 50-gallon electic,
PV pumped flat plate collector system w/80 gallon electric assisted tank,a conventional 40-gallon natural gas tank,a natural gas tankless system, and an electric heat pump water heater.
All auxiliary heating elements are rated to 4500W. Natural gas tank is rated at 38,000 Btu/hr and the tankless can provide up to 190,000 Btu/hr. Details on the measurements and calculations are briefly covered in a calculations procedures link.
HWS Laboratory Event Log - Phase 1 (Mar2009 - May 2010)
HWS Laboratory Event Log - Phase 2 (July 2010)
Caution: Data being collected are preliminary and cannot be used to characterize relative performance without understanding changing experimental conditions. Valid data have been collected for the systems in final configuration since 10 March. Data on system performance prior to insulation of piping can be seen from 3 February - 2 March.
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Jul 28 2010, 00:15 -To- Jul 29 2010, 00:00 EST |
Electricity Usage |
kWh |
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| ELECTRIC TANK 50 GAL |
5.8 |
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| 80 GAL DIFF. FLAT PLATE |
0.3 |
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| ICS w/50 GAL ELECTRIC |
0.0 |
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| 80 GAL PV PUMP FLAT PLATE |
0.0 |
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| HEAT PUMP WATER HEATER |
1.6 |
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Parasitic Energy |
kWh |
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| Differential Controller/Pump |
0.464 |
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| GAS TANKLESS Controls |
0.033 |
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Natural Gas Usage |
cu. ft. |
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| 50 GAL NAT. GAS HEATER |
0.0 |
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| NAT. GAS TANKLESS HEATER |
0.0 |
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Energy Output |
BTU's |
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| ELECTRIC TANK 50 GAL |
16713.0 |
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| 80 GAL DIFF. FLAT PLATE |
21018.0 |
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| ICS W/50 GAL. ELECTRIC |
15777.0 |
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| 80 GAL PV PUMP FLAT PLATE |
24401.0 |
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| 50 GAL NAT. GAS TANK |
0.0 |
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| TANKLESS GAS |
0.0 |
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| HEAT PUMP WATER HEATER |
17209.0 |
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Weather Conditions |
Integrated/AVG. |
Min/Max |
| Solar Insol. @ 22 deg (Whrs/Sq.m) |
6724.3 |
0.0/ 1057.9 |
| Outdoor Temp (deg F) |
87.2 |
77.4/ 101.5 |
| Indoor Shed Space Temp (deg F) |
91.5 |
81.9/ 102.9 |
Daily Efficiencies (COP) |
* parasitic energy included |
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| ELECTRIC TANK 50GAL |
0.85 |
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| 80-GAL DIFF. FLAT PLATE * |
7.80 |
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| ICS W/50 GAL. ELECTRIC |
Infinite |
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| 80-GAL PV PUMP FLAT PLATE |
Infinite |
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| 40 GAL NAT. GAS TANK |
0.00 |
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| TANKLESS NAT. GAS * |
0.00 |
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| HEAT PUMP WATER HEATER |
3.07 |
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Total Daily Gallons |
gal. |
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| ELECTRIC TANK 50 GAL |
64.8 |
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| 80 GAL DIFF. FLAT PLATE |
58.7 |
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| ICS W/50 GAL. ELECTRIC |
62.8 |
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| 80 GAL PV PUMP FLAT PLATE |
66.1 |
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| 40 GAL NAT. GAS TANK |
0.0 |
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| TANKLESS GAS |
0.0 |
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| HEAT PUMP WATER HEATER |
63.5 |
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Draw-weighted Inlet Tempratures |
deg. F |
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| ELECTRIC TANK 50 GAL |
88.7 |
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| SOLAR DIFF 80 GAL |
87.1 |
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| PREHEATED ICS 50 GAL |
125.6 |
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| SOLAR PV 80 GAL |
88.8 |
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| NATURAL GAS 40 GAL |
0.0 |
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| NATRUAL GAS TANKLESS |
0.0 |
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| HEAT PUMP WATER HEATER |
86.9 |
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Draw-weighted Outlet Tempratures |
deg. F |
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| ELECTRIC TANK 50 GAL |
119.6 |
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| SOLAR DIFF 80 GAL |
121.7 |
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| MIX VALVE PRE-HEATED 50 GAL |
115.9 |
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| MIX VALVE SOLAR PV 80 GAL |
131.6 |
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| NATURAL GAS 40 GAL |
0.0 |
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| NATURAL GAS TANKLESS |
0.0 |
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| HEAT PUMP WATER HEATER |
119.4 |
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