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ET 405 Heat Pump for Cooling and Heating Operation
Education / GUNT Hamburg / Thermal Engineering and HVAC / Refrigeration and Air Conditioning Technology /

Refrigeration systems and heat pumps only differ in the definition of their use, but can be of the same design. For example, goods can be refrigerated in a supermarket and the store heated with the waste heat. The store can also be cooled with the same system in the summer.
  With ET 405 the cooling and heating operation can be investigated. Different operating modes can be selected via valves. 
  The refrigeration circuit with compressor and condenser includes two evaporators with fans and thermostatic expansion valves. The two evaporators can be connected in parallel or in series. For the connection in series the capillary tube serves as expansion element. The refrigerant circuit is connected to a glycol-water circuit via a coaxial coil heat exchanger. Via valves the coaxial coil heat exchanger can be switched as an evaporator or condenser. Thus the glycol-water mixture in the tank can be heated or cooled. In pure cooling operation (without heating function) an air-cooled condenser dissipates the heat.
  The measured values are read from digital displays and can at the same time be transmitted via USB directly to a PC where they can be analysed using the software included. The software enables a clear representation of the process. Sight glasses in the refrigerant circuit enable the direct monitoring of the refrigerant state. 
  The well-structured instructional material sets out the fundamentals and provides a step-by-step guide through the experiments.

Learning Objectives / Experiments

- Design, operation and key components of a heat

  pump or refrigeration system 
- Representation of the thermodynamic cycle in

  the log p-h diagram
- Compare different operating modes
- Measurement of compressor capacity and heating

  or cooling capacity in the glycol-water circuit
- Determination of
  * efficiency
  * coefficient of performance of heat pump and

    refrigeration system
  * specific compressor load
  * compressor pressure ratio
  * specific cooling capacity
  * specific refrigeration capacity
- Compare key figures of heat pump and refrigeration



[1] Air-to-water heat pump for cooling or heating operation
[2] Different operating modes selectable via valves
[3] Refrigeration circuit with compressor, condenser with fan, 2 evaporators with fan
[4] Glycol-water circuit with tank, pump and coaxial coil heat exchanger 
[5] Coaxial coil heat exchanger can be used as condenser or evaporator in the refrigeration circuit
[6] 1 thermostatic expansion valve each for coaxial coil heat exchanger and both evaporators
[7] 1 additional evaporation pressure controller and 1 capillary tube for an air cooling evaporator
[8] Displays for temperature, pressure, flow rate and power consumption of the compressor
[9] LabVIEW software for data acquisition with USB under Windows XP or Windows Vista
[10] Refrigerant R134a, CFC-free   

Technical Data

- refrigeration capacity: 372W at 7.2/32°C
Condenser with fan 
- transfer area: 1,0m² 
- capacity: 925W
2 evaporators with fan 
- transfer area: 0,55m²
- capacity: 470W / 1385W
Coaxial coil heat exchanger 
- capacity: 1,6kW at 0°C; ΔT=9K
- max. flow rate: approx. 2,9m³/h
- max. head: approx. 4m

Measuring ranges
- temperature: 6x 0...100°C, 4x -20...40°C
- pressure: 1x -1...9bar, 1x -1...24bar
- flow rate (refrigerant): 1x 3...41kg/h
- flow rate (glycol-water): 1x 4...52g/s
- power: 0...2000W  

Dimensions and Weight
l x w x h: 1700x750x1900mm
Weight: approx. 185kg
Required for Operation
230V, 50/60Hz, 1  phase or 120V, 60Hz, 1 phase
Water connection
Scope of Delivery

1 trainer

1 LabVIEW software CD + USB cable

1 set of  instructional material

Order Details

061.40500  ET 405  Heat Pump for Cooling and Heating Operation