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Teaching objectives

Study of an Air/Water Heat Pump for heating and production of sanitary hot water :

  • Identify the component parts of this equipment and analyze the applicability of the technological choices made,

  • Analysis of the characteristics of the main elements in the circuit, evaporator, condenser, compressors...

  • Study the refrigerating cycle, plotting the cycle on an enthalpy diagram,

  • Monitor refrigeration parameters in accordance with changes in the water heating cycle,

  • Production and critical comparison of thermal assessments calculated on the basis of different groups of parameters measured, Thermal assessment on coolant, Thermal assessment on water circuit.

  • Measurement of coefficient of performance (COP) of the installation,

  • Study of the influence of the quality of thermal exchange at the level of the evaporators and condenser on the installation’s performance (option 4)

  • Study of the reversibility of a heat pump (option 1)

This equipment can be used by students of the level : Vocational diploma...



Low power heat pump unit on table with complete documentation of the different constituent elements in French and examples of practical work.

All of the materials used are of industrial origin

  • Piston compressor ¼ bhp

  • Coolant gas R134A

  • Ranges: Evaporation 5°C, condensation 55°C

  • Water tank simulating the production of sanitary hot water and the inertia tank of a heating installation. As standard, thermal load obtained by connecting the tank to the water outlet and to the drainage.



Standard version :

  • Low and high pressure gauge on the refrigerating circuit,

  • Temperature measurement at compressor input and output

  • Flowmeter on coolant gas

  • Flowmeter on water

  • Temperature measurement at water exchanger input and output

  • Temperature measurement at air exchanger input and output

  • Temperature measurement at water tank

Optional :

  • Temperature measurement (option 3 included) by multi-channel temperature reader/recorder enabling simultaneous monitoring of 4 temperatures, data exportable to PC (USB), software supplied.

  • Option 5: Data acquisition system for PC. The data acquisition also enables monitoring of:

      • High and low pressure at the compressor terminals

      • Tension, Intensity and Power consumed by the compressor

      • Water output at the exchanger

      • Coolant output

Data acquisition enables:

  • Display of values measured in real time in a spreadsheet

  • Plotting the refrigerant cycle in real time


Running the installation:

As standard :

The installation is run from a control panel including:

  • Power-on switch

  • Switch for simultaneous start-up of the compressor, air evaporator and water circulator.

  • Selection of heating mode or sanitary hot water mode

  • High and lower pressure gauge

  • Temperature indicator at compressor terminals

  • Cycle inverter for option 1

  • Start-up switch for fan convector unit for option 2

  • Temperature measurement for option 3

  • Speed variator for air exchanger ventilator for option 4

With option 5 :

  • Data acquisition, running and monitoring through PCVue software and Twido automaton


Electrical cabinet for controls and power:

  • Circuit breaker on outside of cabinet equipped with a padlock

  • Electrical cabinet

    • Differential circuit breaker, 30 mA

    • Protection circuit breakers

    • Electrical meter on compressor

The system can be connected to Canalis or PC


Option 1 Reversible system, enabling study of functioning of a 4-channel gate valve and study of refrigeration from a second approach.

Option 2 Addition of a fan convector unit to the water circuit in order to simulate energy consumption or reduce the temperature of the tank without loss of wate

Option 3 Temperature measurement at the different critical points of the refrigerating circuit for a more precise analysis of the functioning of the different elements of the circuit

Option 4 Variable output air exchanger and valve limiting the flow of water to the exchanger in order to study the influence of levels of thermal exchange on the functioning of the refrigerating circuit.

Option 5 Data acquisition, driving and monitoring

Option 6 Energy meter on water circuit


Services required

Power supply : 220 V – 1.5 kW

System dimensions : 800 x 1000 x 1700 mm