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2. Heat pump - Wikipedia

   en.wikipedia.org/wiki/Heat_pump

   Specifically, the heat pump transfers thermal energy using a heat pump and refrigeration cycle, cooling the cool space and warming the warm space. [1] In winter a heat pump can move heat from the cool outdoors to warm a house; the pump may also be designed to move heat from the house to the warmer outdoors in summer.

3. Daikin - Wikipedia

   en.wikipedia.org/wiki/Daikin

   As of April 2014, Daikin Hydraulics marketed a line of piston pumps, vane pumps, manual pumps, solenoid valves, and flow and control valves, claiming their pump technology to be 50–70 percent more energy efficient than conventional technology. [20]

4. Solar-assisted heat pump - Wikipedia

   en.wikipedia.org/wiki/Solar-assisted_heat_pump

   The operating conditions' optimization of this system is the main challenge, because there are two opposing trends of the performance of the two sub-systems: by way of example, decreasing the evaporation temperature of the working fluid increases the thermal efficiency of the solar panel but decreases the performance of the heat pump, and consequently the COP. [4]