ASHRAE Heat Loss Calculations

One Uninsulated 4” Valve is Comparable to 8.5’ of Exposed Piping!


Steam Pressure (P.S.I.):

Surface Area of Equipment:

Annual Operation Hours:

COST MM/BTU:

Heat Loss (million btu’s):

Heat Saved (million btu’s):

Total First Year Savings:

Total Insulation Cost:

Total Labor Cost:

Payback Days:

150

10 sq. ft.

8760

$ 13.70

102.23

95.31

$ 1,305.73

$ 300.00

$ 22.50

90

80

10 sq. ft.

8760

$ 13.70

87.45

92.78

$ 997.06

$ 300.00

$ 22.50

110

40

10 sq. ft.

8760

$ 13.70

50.97

47.01

$ 644.10

$ 300.00

$ 22.50

183

ASHRAE Heat Transfer Calculations Assumed 80 degree ambient, year round operation. $13.70/1000# steam cost.

Heat Losses Through Uninsulated Indoor Valves based on ASHRAE Heat Transfer Figures


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