What is the difference between a refrigerator and a heat pump? What is the difference between...

What is the difference between a refrigerator and a heat pump? What is the difference between a refrigerator and an air conditioner? Define the coefficient of performance of a refrigerator in words. Can it be greater than unity? Check the specification of refrigerator or air-conditioner at your home. See if you can obtain COP of the machine. A heat pump that is used to heat a house has a COP of 2.5. That is, the heat pump delivers 2.5 kWh of energy to the house for each 1 kWh of electricity it consumes. Is this a violation of the first law of thermodynamics? Explain.

Expert Solution

Difference between Refrigerator and Heat pumps

1) Transfer of heat: Both the refrigerator and the heat pumps carry the heat from low temperature reservoir or the sink to the high temperature reservoir or source. The main purpose of the refrigerator is to chill or cool or freeze the substance, by maintaining very low temperature in the freezer. It absorbs the heat from the freezer or evaporator and throws it to the atmosphere which is at high temperature.

The main purpose of the heat pump is to heat the room during winter seasons or when the atmospheric temperature is very low. It absorbs the heat from the atmosphere which is at low temperature and throws it to the room which is at high temperature and which is to be heated.

2) Location of the evaporator: In the refrigerator the evaporator is located in the freezer section. The evaporator absorbs the heat from the substance, which is to be cooled. In the heat pump the evaporator is located outside the room which is to be heated. The evaporator absorbs the heat, which is later thrown inside the room for heating it.

3) Location of the condenser: In the refrigerator the condenser is located outside the refrigerator and it is exposed to the atmosphere. It is through the condenser that the heat is thrown to the atmosphere. In the heat pump the condenser is located inside the room and it acts as the heating devise.

4) Working of evaporator and condenser: In the refrigerator the evaporator performs the main function of chilling or freezing, while the condenser performs the function of delivering the heat to the atmosphere. In the heat pump, it is the condenser that performs the main function of heating the room, while the evaporator performs the function of absorbing the heat from the atmosphere....

....

COP of 2.5 doesn't violate first law of thermodynamics

genius_generous answered 2 years ago

(a) Which might describe a heat engine? (b) Which might describe a heat pump? (c) Which might describe a refrigerator? Explain.

(a) Which might describe a heat engine? (b) Which might describe a heat pump? (c) Which might describe a refrigerator? Explain.The figure shows PV diagrams for five cyclical processes. (Cycle D is a simplified model of a steam engine cycle.)

What is the difference between entropy, enthalpy, and heat transfer?

1. What is the difference between the heat of reaction, Qrxn, and the enthalpy of reaction,...

1. What is the difference between the heat of reaction, Qrxn, and the enthalpy of reaction, Hrxn? ( 2. In a coffee-cup calorimeter, 1.40 g of NH4NO3 is mixed with 71.0 g of water at an initial temperature of 25.00 oC. After dissolution of the salt, the final temperature of the calorimeter content is 23.39 oC. Assuming the solution has a heat capacity (Cp) of 4.18 J/ oC•g and assuming no heat loss to the calorimeter (surroundings), calculate the enthalpy...

A heat engine running backward is called a refrigerator if its purpose is to extract heat...

A heat 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 Q H , warming the indoors. Perhaps this...

What is the difference between internal energy, heat, and enthalpy? Are they ever the same? Please...

What is the difference between internal energy, heat, and enthalpy? Are they ever the same? Please write down and describe a couple of equations that help us understand the relationship between these quantities.

A heat pump is used to heat a house with an indoor temperature of 21 ◦C....

A heat pump is used to heat a house with an indoor temperature of 21 ◦C. Assume the outdoor temperature is -9 ◦C. What is the maximal energy that could be delivered to the house in one second if the work done on the heat pump is 1500 W (1500 J/s)? (a) 3000 J (b) 3500 J (c) 15.0 kJ (d) 200 J (e) 10.7 kJ

Explain the thermodynamic principle of a geothermal heat pump.

Professor Modyn wants to power his refrigerator with a heat engine. A Carnot heat engine receives...

Professor Modyn wants to power his refrigerator with a heat engine. A Carnot heat engine receives heat from a reservoir at 493.0°C at a rate of 767 kJ/min and rejects heat to the ambient air at 29.1°C. The entire work output of the heat engine is used to drive a refrigerator that removes heat from the refrigerated space at -3.23°C and transfers it to the same ambient air at 29.1°C. Note: The IUPAC sign conversion for work is used. Work...

What is the maximum coefficient of performance for a heat pump if you live somewhere where...

What is the maximum coefficient of performance for a heat pump if you live somewhere where the outdoor winter temperatures are -15°C and you want the inside of your house to be 23°C? If you put 1500 W of power over two hours into the heat pump, what is the maximum amount of heat you can get out of it? Find the work required if the outside temperature is 2°C and use this data to find out if heat pumps...

You are installing a heat pump whose COP is half the COP of a reversible heat...

You are installing a heat pump whose COP is half the COP of a reversible heat pump. You plan to use the pump on chilly winter nights to increase the air temperature in your bedroom. Your bedroom's dimensions are 5.35 m ? 3.6 m ? 2.7 m. The air temperature should increase from 63° F to 68° F. The outside temperature is 35° F, and the temperature at the air handler in the room is 112° F. If the pump's...

Question