Engineering

Engineering, 20.08.2019 19:20, FrankyV4387

A4 hp heat pump operates between 10°f and 105°f. the maximum theoretical amount of energy that can be removed from the outdoors is

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Physics, 22.06.2019 08:00, kaylaamberd

Aheat engine running backward is called a refrigerator if its purpose is to extract heat from a cold reservoir. the same engine running backward is called a heat pump if its purpose is to exhaust warm air into the hot reservoir. heat pumps are widely used for home heating. you can think of a heat pump as a refrigerator that is cooling the already cold outdoors and, with its exhaust heat qh, warming the indoors. perhaps this seems a little silly, but consider the following. electricity can be directly used to heat a home by passing an electric current through a heating coil. this is a direct, 100% conversion of work to heat. that is, 19.0 \rm kw of electric power (generated by doing work at the rate 19.0 kj/s at the power plant) produces heat energy inside the home at a rate of 19.0 kj/s. suppose that the neighbor's home has a heat pump with a coefficient of performance of 4.00, a realistic value. note: with a refrigerator, "what you get" is heat removed. but with a heat pump, "what you get" is heat delivered. so the coefficient of performance of a heat pump is k=qh/win. an average price for electricity is about 40 mj per dollar. a furnace or heat pump will run typically 200 hours per month during the winter. what does one month's heating cost in the home with a 16.0 kw electric heater? what does one month's heating cost in the home of a neighbor who uses a heat pump to provide the same amount of heating?

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Engineering, 11.07.2019 02:20, idalieramirez8517

Aheat pump cools a house at 20-c when the maximum outside temperature is 34°c. the house gains 0.7 kw per degree temperature difference from the ambient, and the heat pump's cop is 70% of the theoretical maximum. find the minimum power input of the heat pump for which it provides sufficient cooling.

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Engineering, 20.08.2019 20:30, tessa70

Aheat pump receives energy from a source at 60 °c and delivers energy to a boiler that operates at 250 kpa. the boiler input is saturated liquid water and the exit is saturated vapor both at 350 kpa. the heat pump is driven by a 2.5 mw motor and has a cop that is 50% of a carnot heat pump cop. what is the maximum mass flow rate of water the system can deliver?

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Engineering, 22.08.2019 17:20, Aliciaonfleek

Aheat pump receives energy from a source at 75 °c and delivers energy to a boiler that operates at 300 kpa. the boiler input is saturated liquid water and the exit is saturated vapor both at 350 kpa. the heat pump is driven by a 3 mw motor and has a cop that is 50% of a carnot heat pump cop, what is the maximum mass flow rate of water the system can deliver?

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A4 hp heat pump operates between 10°f and 105°f. the maximum theoretical amount of energy that can b...

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