A cylindrical hot water storage tank fired by natural gas having outer diameter of 46cm is to be purchased that can supply hot water at 60.
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1. A cylindrical hot water storage tank fired by natural gas having outer diameter of 46cm is to be purchased that

can supply hot water at 60℃. The wall of the tank has thickness of 2cm and is filled with foam insulation having k=0.03W/m.℃. The tank will be placed in the basement having temperature of 15℃.


1) Rate of heat loss from the tank?

2) The amount of heat loss per year?

3) Cost of heat lost per year if price of natural gas is 6cents/kWh.

4) A frost king water heat insulation blanket consisting of 3cm thick fibre glass insulation (k=0.035 W/m.℃) is available from a market for $50. How much heat loss will be reduced annually if this blanket is installed?

5) How long will it take for this blanket to pay for itself ?

Assume:

- Tank Height: 2m

- Heat transfer coefficient of tank surface: 12W/m2K

- Fuel conversion efficiency: 60%

- Top and bottom surface of tank have negligible heat loss

Any other missing data can be assumed accordingly

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