Designing an Aquaponic Greenhouse for an Urban Food

If the greenhouse has half of every wall made of plywood

Insulation

(R-value)

Heat loss (U-

value)

Btu/(h*F*ft^2 )

Area

(ft^2 )

∆푇

(60F-

15F)

Q

(Btu/h)

Solexx 2.10-2.30 0.45 1320 45 26730

Multi-wall

polycarbonate

1.5-2.0 0.6 1320 45 35640

Single-wall

polycarbonate

2.0 0.5 1320 45 29700

If the greenhouse has one wall and half of the other walls made out of plywood

Insulation

(R-value)

Heat loss (U-

value)

Btu/(h*F*ft^2 )

Area

(ft^2 )

∆푇

(60F-

15F)

Q

(Btu/h)

Solexx 2.10-2.30 0.45 1188 45 24057

Multi-wall

polycarbonate

1.5-2.0 0.6 1188 45 32076

Single-wall

polycarbonate

2.0 0.5 1188 45 26730

Appendix H: Calculations for Heat Loss

Area x (In - Out) x Heat Loss=Total BTU required

1 BTU/hr. = 0.29307107 W

1000 w= 1kW

Monthly average is calculated based on 2 division since the chance for the temperature to be

on its lowest average all month is very remote and also to get more realistic results.

Monthly Electricity Required= (24h kWh 30)/2

Cost monthly =$0.17* Total monthly electricity