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Heat pumps allow the utilization of free environmental energy. Their build-up is equivalent to a cooling unit. With the help of electric energy they can use existing free environmental energy from wells, soils or ambient atmospere for heating purposes, by pumping it on higher temperature level. The test stand demonstrates practically the dependencies of the thermo-dynamical cycle process. Above photo shows on right heat pump producing hot water for air-heating (Test stand "Fan- and thermic measurements").

Systems:

1000W compressor
Fan and thermic heat pump
Air-cooled evaporater
Coaxial condensator avoids water generation
50l reservoir
Efficiency up to 4

Measuring systems:

The measuring devices are digitally connected to the internal controller, sending serial data to the comprised portable PC. Stand control and data acquisition can be performed by Windows-software. Measured quantities are:

3 x temperatures: Before and behind condensator and reservoir
Temperature and pressure of refrigerant agent
Water flow rate
Electrical power consumption

Extension:

The stand is moveable and can be connected to a warm water consumer like Test stand "Fan and thermic measurements"

Technical details:

Dimensions:	1.1m x 0.8m x1.6m
Weight:	50 kg
Services:	240 VAC, water

Heat pump 250W

Systems:

250W compressor
Air-cooled evaporater
Coaxial condensator against water
Control of water flow-rate
Manometer, usable in cold environments
Efficiency up to 4

Measuring systems:

3 temperatures: Before and behind condensator, and in reservoir
Temperature and pressure of refrigerating agent
Water flow-rate
Electrical power consumption

Extension:

The stand is moveable and connectable to Solar collector.

Technical details:

Dimensions:	1.1m x 0.8m x1.6m
Weight:	50 kg
Services:	240 VAC, water

log p/h diagram of heat pump:

qc is the effective heat with the niveau tc.

qo is the for cooling processes usable refrigerating capacity.

In the diagram you can see that efficiency E depends on tc and to and on the quality of the plant's devices. This dependency can be shown with this test stand.

Keywords: Refrigeration, Heat Pumps, Vapor-Compression, Refrigerator, log p,h-diagram, Refrigerant, Efficiency, Entropy, Enthalpy, boiling state