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  3. heat losses from natural gas water heaters can still occur...

Question: heat losses from natural gas water heaters can still occur...

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Pr.2.3) Heat losses from natural gas water heaters can still occur when i is idle. Consider a 80 gallon water tank with the tank temperature set at 160°F and cold water from the main supply at 40 °F. The heater has a thermal efficiency of 0.6. About 5% of the heat contained in the tank is lost every hour through the envelope of the tank. Further, there is a hot water leak in the faucets of 0.5 gpm (gallons min). Calculate; (a) The heat capacitance of the tank in MJ (b) In how many hours will the heat losses (inefficiency of the water heater plus the heat losses from the tank envelope plus the heat loss due to dripping faucet) be equal to the heat capacitance of the tank?Heat losses from natural gas water heaters can still occur when it is idle. Consider a 80 gallon water tank with the tank temperature set at 1600F and cold water from the main supply at 40 0F. The heater has a thermal efficiency of 0.6. About 5% of the heat contained in the tank is lost every hour through the envelope of the tank. Further, there is a hot water leak in the faucets of 0.5 gpm (gallons/min). Calculate:(a) The heat capacitance of the tank in MJ( b) In how many hours will the heat losses (inefficiency of the water heater plus the heat losses from the tank envelope plus the heat loss due to dripping faucet) be equal to the heat capacitance of the tank?

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