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Carbon Dioxide (R744)

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Carbon Dioxide (R744) ( carbon-dioxide-r744 )

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Notice that in addition to serving as an air conditioner/space heater, the high compressor outlet temperature can be used to provide hot water at a significant economy over the regular gas or electric hot water heater. Thus the heat flow to the hot water heater cools the gas from 160°C to 70°C, and the heat flow to the space heater further reduces the gas temperature to 45°C. In order to determine the enthalpy at outlet station (4) we need to consider the energy equation applied to the internal heat exchanger. Since we assume that it is externally adiabatic, all the heat transfer is internal, as shown in the following: Drawing all the processes of the above scheme on a P-h diagram we obtain the following diagram. Notice the sketches on the diagram of the various components as well as the internal heat exchanger indicating the heat flow from the gas cooler outlet (3) - (4) to the compressor inlet (6) - (1).

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Carbon Dioxide (R744)

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