A heat pump loop can provide cooling by using a reversing valve to convert the indoor coil to an evaporator and the outdoor coil to a condenser. Question 14Select one: True False
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A heat pump can provide both heating and cooling by reversing the refrigeration cycle. Show more…
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A heat pump that operates on the ideal vaporcompression cycle with refrigerant- $134 \mathrm{a}$ is used to heat a house and maintain it at $26^{\circ} \mathrm{C}$ by using underground water at $14^{\circ} \mathrm{C}$ as the heat source. Select reasonable pressures for the evaporator and the condenser, and explain why you chose those values.
20.42. Heat Pump. A heat pump is a heat engine run in reverse. In winter it pumps heat from the cold air outside into the warmer air inside the building, maintaining the building at a comfortable temperature. In summer it pumps heat from the cooler air inside the building to the warmer air outside, acting as an air conditioner. (a) If the outside temperature in winter is $-5.0^{\circ} \mathrm{C}$ and the inside temperature is $17.0^{\circ} \mathrm{C}$ , how many joules of heat will the heat pump deliver to the inside for each joule of electrical energy used to run the unit, assuming an ideal Carnot cycle? ( b) Suppose you have the option of using electrical resistance heating rather than a heat pump. How much electrical energy would you need in order to deliver the same amount of heat to the inside of the house as in part (a)? Consider a Carnot heat pump delivering heat to the inside of a house to maintain it at $68^{\circ} \mathrm{F}$ . Show that the beat pump delivers less heat for each joule of electrical energy used to operate the unit as the outside temperature decreases. Notice that this behavior is opposite to the dependence of the efficiency of a Carnot heat engine on the difference in the reservoir temperatures. Explain why this is so.
A heat pump, shown in Figure $\mathrm{P} 22.26$ , is essentially an air conditioner installed backward. It extracts energy from colder air outside and deposits it in a warmer room. Sup- pose that the ratio of the actual energy entering the room to the work done by the device's motor is 10.0$\%$ of the theoretical maximum ratio. Determine the energy entering the room per joule of work done by the motor, given that the inside temperature is $20.0^{\circ} \mathrm{C}$ and the outside temperature is $-5.00^{\circ} \mathrm{C} .$
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