File Name: difference between heat engine heat pump and refrigerator .zip
- Comparison Between Heat Engine, Refrigerator, And Heat Pump
- 12.4 Applications of Thermodynamics: Heat Engines, Heat Pumps, and Refrigerators
- Heat engine
In thermodynamics and engineering , a heat engine is a system that converts heat or thermal energy to mechanical energy , which can then be used to do mechanical work. A heat source generates thermal energy that brings the working substance to the high temperature state. The working substance generates work in the working body of the engine while transferring heat to the colder sink until it reaches a low temperature state. During this process some of the thermal energy is converted into work by exploiting the properties of the working substance. The working substance can be any system with a non-zero heat capacity , but it usually is a gas or liquid.
Comparison Between Heat Engine, Refrigerator, And Heat Pump
Figure 1. Almost every home contains a refrigerator. Heat pumps, air conditioners, and refrigerators utilize heat transfer from cold to hot. They are heat engines run backward. We say backward, rather than reverse, because except for Carnot engines, all heat engines, though they can be run backward, cannot truly be reversed.
12.4 Applications of Thermodynamics: Heat Engines, Heat Pumps, and Refrigerators
All the components of the heat pumps are same as the refrigerator and even they perform the similar functions; the only difference is that in the heat pumps the components work in a reverse manner. The heat pump is the reverse refrigerator. 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. The evaporator absorbs the heat from the substance, which is to be cooled.
Thermodynamic heat pump cycles or refrigeration cycles are the conceptual and mathematical models for heat pump , air conditioning and refrigeration systems. A heat pump is a mechanical system that allows for the transmission of heat from one location the "source" at a lower temperature to another location the "sink" or "heat sink" at a higher temperature. In either case, the operating principles are close. According to the second law of thermodynamics heat cannot spontaneously flow from a colder location to a hotter area; work is required to achieve this. Similarly, a refrigerator moves heat from inside the cold icebox the heat source to the warmer room-temperature air of the kitchen the heat sink.
In heat engine the heat supplied to the engine is converted into useful work. If Q 2 is the heat supplied to the engine and Q 1 is the heat rejected from the engine, the net work done by the engine is given by:. The performance of a heat engine is expressed by its efficiency. We know that the efficiency or coefficient of performance of an engine,. Refrigerator is a reversed heat engine which either cool or maintain the temperature of a body T 1 lower than the atmospheric temperature Ta.
Hello Readers, in today's session, we will discuss on the Difference between a Refrigerator, Heat Pump, and Heat Engine in a detailed way with respective figures. Before going to the differences, let give you an overview of these three devices. In a heat engine, the heat supplied to the engine is converted into useful work. If Q2 is the heat supplied to the engine and Q1 is the heat rejected from the heat engine, then the network done by the engine is given by.
Difference between Refrigerator and Heat pumps
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