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waer at 55%C. The tank is located in a mall room whobe average temperafure is 27C, and the heat tnaisifer coefficients on the inner and outer purfaces of the heater are 90 and 12Wim2K. respectively, The bank is placed in andtice 46 -etm-tiameter sheet metal tank of negligible thickeses, and the space between the two tands is fitled with foam insulation (k-0.03. Whim K). The thennal resistases of the water tank and ste ebier thin sheet metal shell are very tmall and can be neglecied. The price of electrieity is 50.06kWh. and the honte owner pays 5280 a year for water heating Determine the fraction of the hot-water energy cost of this housbold that is due to the heat loss froen the tank. Hot-water tank insulation kits consisting of 3-cmthick fiberglass insulation (k=0.035W/mK) large enough to wrap the entire tank are available in the market for about $30. If such an ifsulation is installed on this water tank by the boene owner himself, how long will it take for this additional insulabion to pay for itself? [Answers: 17.2 perceet, 19 menths]