This sunspace addition review shows a realistic savings, assuming that the entire space will be maintained at the same temperature. A 12ft by 32ft addition will bring the buildings Solar Gain Fraction to 36% from 13% and adds 384square feet of living space. Space that will grow vegetables in every season and bring in the healing touch of sunlight when it is below zero outside. ( The early Romans enacted laws that would protect a propertys' right to sunlight. Those laws were reinstated in many states, during the early 1980s'.)
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Solar Gain Fraction: The portion of heat energy supplied by solar gain in proportion to the overall heat load of a building.
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HOUSE DATA COMPARISON
REPORT |
HOT2000 |
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3300 pine hills solarVr10 |
3300 pine hills electricv10 |
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COMPONENT ANNUAL HEAT LOSS (Mil.BTU) |
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ZONE 1 : ABOVE GRADE |
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Ceiling |
6.9 |
5.6 |
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Main Walls |
11.8 |
10.9 |
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Doors |
2.4 |
2.5 |
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South Windows |
11.6 |
1.8 |
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East Windows |
5.0 |
3.7 |
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North Windows |
2.5 |
2.5 |
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West Windows |
3.7 |
2.5 |
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Slab on Grade |
31.9 |
27.4 |
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ZONE 1 Totals: |
75.8 |
57.0 |
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INTER-ZONE Floors |
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ZONE 2 : Basement |
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ZONE 2 Totals: |
0.0 |
0.0 |
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Ventilation |
3.8 |
3.7 |
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AIR LEAKAGE AND VENTILATION SYSTEMS |
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House Volume (ft3) |
20256.0 |
20000.0 |
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Envelope Surface Area (ft2) |
6792.0 |
5688.0 |
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Natural Infiltration Rate (ACH) |
0.036 |
0.036 |
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Equivalent Leakage Area (in2) |
48.0 |
47.4 |
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Central Ventilation Supply Rate (ACH) |
0.000 |
0.000 |
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Central Ventilation Exhaust Rate (ACH) |
0.000 |
0.000 |
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Other Supply Rate (ACH) |
0.000 |
0.000 |
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Other Exhaust Rate (ACH) |
0.000 |
0.000 |
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Seasonal HRV Efficiency (%) |
0.0 |
0.0 |
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Gross Air and Vent. Energy (Mil.BTU) |
3.8 |
3.7 |
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Vent. Elec. Load: Heating Hrs (Mil.BTU) |
0.0 |
0.0 |
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Vent. Elec. Load: Non Htg Hrs (Mil.BTU) |
0.0 |
0.0 |
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Net Air and Vent. Energy (Mil.BTU) |
3.8 |
3.7 |
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ANNUAL SPACE HEATING SUMMARY |
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Design Heat Loss ( |
34574 |
27628 |
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Gross Space Heat Loss (Mil.BTU) |
79.6 |
60.7 |
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Sensible Occupancy Heat Gain (Mil. Btu/day) |
2.00 |
2.00 |
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Usable Internal Gains (Mil.BTU) |
16.8 |
17.2 |
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Usable Internal Gains Fraction (%) |
21.1 |
28.4 |
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Usable Solar Gains (Mil.BTU) |
29.0 |
8.2 |
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Usable Solar Gains Fraction (%) |
36.4 |
13.5 |
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Vent. Electrical Contribution (Mil.BTU) |
3.8 |
3.7 |
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Auxiliary Energy Required (Mil.BTU) |
33.7 |
35.3 |
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SPACE + DHW ENERGY (Mil.BTU) |
33.7 |
36.2 |
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R-2000 SPACE + DHW TARGET (Mil.BTU) |
51.5 |
51.1 |
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ANNUAL FUEL CONSUMPTION SUMMARY |
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Electricity (Mil. Btu) |
14634.2 |
15366.6 |
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ESTIMATED FUEL COSTS (Dollars) |
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Electricity |
1463.4 |
1536.7 |
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Total |
1463.4 |
1536.7 |
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ANNUAL SPACE HEATING SYSTEM PERFORMANCE |
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Space Heating Load (Mil.BTU) |
33.7 |
35.3 |
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Furnace Input (Mil.BTU) |
33.7 |
35.3 |
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Pilot Light (Mil.BTU) |
0.0 |
0.0 |
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Indoor Fans (Mil.BTU) |
0.0 |
0.0 |
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Heat Pump Input (Mil.BTU) |
0.0 |
0.0 |
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Total Input (Mil.BTU) |
33.7 |
35.3 |
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System COP |
10.0 |
11.0 |
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This shows the heat load effect of adding a sunspace to this very well insulated building. The sunspace adds 385 square feet of living space and lowers the annual energy usage by 1.6 Million BTU’s per year. Notice that the yearly operating cost, at $.10 / kwh, has been reduced by $73 per year and the building size has increased by nearly 20%.
