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Question: fhmt 36 the energy consumption associated with a home water...

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  1. (FHMT 36) The energy consumption associated with a home water heater has two components: 1) the energy that must be supplied to bring the groundwater up to the storage temperature as it replaces the water drawn from the tank 2) the energy to compensate for heat losses while the water is stored (called standby losses). A family of four uses 100 gallons per day of hot water, and groundwater is available at 15°C. Typical standby losses for a water heater are around 145 W (around 500 Bth/hr).
    1. What is the annual energy consumption to keep the water at 55°C?
    2. If electricity costs $0.12/kWh, what is the annual cost to heat water using electric resistance heaters?
    3. For the same $0.12/kWh as b), what is the annual cost using a heat pump with COP = 3?
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