Heat pump

The heat pump

The heat pump is a machine capable of transferring thermal energy from a lower temperature source to higher temperature source, using electrical energy. The concept of heat has to be separated from bodily sensations. An object at a temperature of -30°C still contains heat, in fact, taking heat away from it, it can be brought to -40°C . The concept is valid up to a temperature of -273.15°C (absolute zero), the temperature at which a body no longer contain any heat. The high temperature source produces all the heat that has been taken from the low temperature source plus the work spent to complete the task. Work is transformed into heat .

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The refrigerator that we have at home removes heat from the internal exchanger ( at -20°C , the compartment where ice cubes are produced) transfering it to the outdoor heat exchanger (at +40°C, the radiator normally placed in the back of the refrigerator)
The efficiency of the heat pump depends on the temperature of the two sources. The greater the difference of the temperature between the two sources, the lower the yield. For example: We want to heat a room with a floor panel system, and we need water at +30°C (high temperature source). We have ground water at a temperature of 15°C (low temperature source). In these conditions, a heat pump, for each kW absorbed (electricity consumption) makes 6,47 kW (thermal yield).


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