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   Energy use comparison for solar addition
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
Natural Resources CANADA
Version 10.20

 

 

3300 pine hills solarVr10

3300 pine hills electricv10

 

 

 

COMPONENT ANNUAL HEAT LOSS (Mil.BTU)

 

 

 

 

 

ZONE 1 : ABOVE GRADE

 

 

 

 

Ceiling

6.9

5.6

 

 

Main Walls

11.8

10.9

 

 

Doors

2.4

2.5

 

 

South Windows

11.6

1.8

 

 

East Windows

5.0

3.7

 

 

North Windows

2.5

2.5

 

 

West Windows

3.7

2.5

 

 

Slab on Grade

31.9

27.4

 

 

 

ZONE 1 Totals:

75.8

57.0

 

 

 

INTER-ZONE Floors

 

 

 

 

 

ZONE 2 : Basement

 

 

 

 

 

ZONE 2 Totals:

0.0

0.0

 

 

 

 

 

Ventilation

3.8

3.7

 

 

 

AIR LEAKAGE AND VENTILATION SYSTEMS

 

 

 

 

House Volume (ft3)

20256.0

20000.0

 

 

Envelope Surface Area (ft2)

6792.0

5688.0

 

 

Natural Infiltration Rate (ACH)

0.036

0.036

 

 

Equivalent Leakage Area (in2)

48.0

47.4

 

 

Central Ventilation Supply Rate (ACH)

0.000

0.000

 

 

Central Ventilation Exhaust Rate (ACH)

0.000

0.000

 

 

Other Supply Rate (ACH)

0.000

0.000

 

 

Other Exhaust Rate (ACH)

0.000

0.000

 

 

Seasonal HRV Efficiency (%)

0.0

0.0

 

 

Gross Air and Vent. Energy (Mil.BTU)

3.8

3.7

 

 

Vent. Elec. Load: Heating Hrs (Mil.BTU)

0.0

0.0

 

 

Vent. Elec. Load: Non Htg Hrs (Mil.BTU)

0.0

0.0

 

 

Net Air and Vent. Energy (Mil.BTU)

3.8

3.7

 

 

 

ANNUAL SPACE HEATING SUMMARY

 

 

 

 

Design Heat Loss (Watts)

34574

27628

 

 

Gross Space Heat Loss (Mil.BTU)

79.6

60.7

 

 

Sensible Occupancy Heat Gain (Mil. Btu/day)

2.00

2.00

 

 

Usable Internal Gains (Mil.BTU)

16.8

17.2

 

 

Usable Internal Gains Fraction (%)

21.1

28.4

 

 

Usable Solar Gains (Mil.BTU)

29.0

8.2

 

 

Usable Solar Gains Fraction (%)

36.4

13.5

 

 

Vent. Electrical Contribution (Mil.BTU)

3.8

3.7

 

 

Auxiliary Energy Required (Mil.BTU)

33.7

35.3

 

 

SPACE + DHW ENERGY (Mil.BTU)

33.7

36.2

 

 

R-2000 SPACE + DHW TARGET (Mil.BTU)

51.5

51.1

 

 

 

ANNUAL FUEL CONSUMPTION SUMMARY

 

 

 

 

Electricity (Mil. Btu)

14634.2

15366.6

 

 

 

ESTIMATED FUEL COSTS (Dollars)

 

 

 

 

Electricity

1463.4

1536.7

 

 

 

Total

1463.4

1536.7

 

 

 

 

ANNUAL SPACE HEATING SYSTEM PERFORMANCE

 

 

 

 

Space Heating Load (Mil.BTU)

33.7

35.3

 

 

Furnace Input (Mil.BTU)

33.7

35.3

 

 

Pilot Light (Mil.BTU)

0.0

0.0

 

 

Indoor Fans (Mil.BTU)

0.0

0.0

 

 

Heat Pump Input (Mil.BTU)

0.0

0.0

 

 

Total Input (Mil.BTU)

33.7

35.3

 

 

System COP

10.0

11.0

 

 

 

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%.

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