Let Us Calculate

HEATLOSS

PASSIVE SOLAR	(See Chart 2)
Annual Participation	(See Chart 3)
Yearly home heating required	19,400,000 BTU/yr
Average passive solar contribution	13,976,000 BTU/yr
Remaining annual heat required	5,422,000 BTU/yr

  

HEAT STORAGE

Home’s thermal mass    (See Chart 4)
150,272 lbs
      X .20 BTU/1 lb/1 degree fahrenheit 
  30,054 BTU of storage per 1º F interior temperature rise

Home’s interior temperature fluctuation
Average January day = 3.85º F
Maximum January day = 4.84º F
Home’s interior temperature swing should be within most occupants’ comfort range

Remaining annual heating required    (See Chart 3)

$5,422,000	BTU/year - space heating
+12,552,000	BTU/year - domestic hot water - family of four
17,974,000	Total
- 16,542,000	Thermal solar annual heat provided
1,432,000	Remaining heating required
/3,413	BTU/KWH
419.5	Annual KWHs needed for heating
+       3,384.5	Annual KWHs needed for lights and appliances
3,804.0	Total annual KWHs needed for home
-        3,815.0	P.V. array annual contribution (See Chart 5)
Net Zero+    11.0	KWH balance sold to utility company

Summary:

SunTerra's 14 steps to a net-zero home, one that produces as much energy per year as it consumes, is based on 30 years experience in designing and building energy efficient homes for our customers.  Now known as green home designs.

Is this home cost effective and affordable? 

LET US EVALUATE COST

DATA ACQUIRED

SOLAR RADIATION

The Solar Radiation Data Manual for Flat-Plate and Concentrating Collectors

HTTP://RRedc.nrel.gov/solar/old_data/nsrdb/redbook/sum2

Western Regional Climate Center

HTTP://www.wrcc.dri.edu/CLIMATEDATA.html

TEMPERATURE

Western Regional Climate Center Comparative Data for the Western States

HTTP://www.wrcc.dri.edu/htmlfiles