Question

# 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

### Recently Asked Questions

- what are 5 common lubricants used in chains and a few pros and cons of each?

- A heat generating wall of 0.1 m thickness with a heat generation rate of 5 MW/m3 is of material with a conductivity of 25 W/mK is exposed on both sides to

- I can't seem to use this graph correctly in order to get reasonable answers.