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Design Criteria
SURFACE
DESCRIPTION
AREA
R VALUE
U VALUE
LOSS FACTOR
BTU/HR
30 degrees
BTU/24Hr
30 degrees
FLOOR
1" Gravel + Fabric
144
.4
57.6
1728
FLOOR
VB + 1.5" beadboard Insulation
32
5
.13
4.16
120
SILL
Wood timber 12"
20
.8
16
480
REAR
VB + Frame Wall
176
11
0.7
40.3
1200
REAR
VB + Windows
20
1.0
20
600
SIDES
VB + Foil Faced Insulation + Fabric
80
7.2
.16
12.8
3850
KNEEWALL
VB + Fabric
44
1.6
71.4
2100
GLAZING
VB (4mil poly) + Fabric
264
1.6
392
11760
TOTAL CONDUCTIVE LOSS
594
17820
508280
INFILTRATE
Door + Sill + VB (est .25 x total)
119
3570
90000
VENTILATE
 500 cfm x .18      (.6/min x 880 cu ft)
TOTAL HEAT LOSS
713
21990
598300
SOLAR
(est 200) Btu x glazing x 10 Hr
392
200
784000
NET  HEAT GAIN
185700
STORAGE
Water 2.27 gal/sq ft
400 gal
8.33 #
3320
99600
SOIL MASS
100 gallons soil/gravel x (5?)
500
15000
AUX HEAT
1500 W radiant heater
5100
122400
BENCH
2 - 250W heat cables  (3412 btu/kwh)
32
1706
40944