With the air-to-water heat pump the ambient heat of the air is used to heat water.
The heat pump circuit consists of a compressor, an evaporator with fan, a thermostatic expansion valve and a coaxial coil heat exchanger as condenser. All components are clearly arranged in the trainer.
The compressed refrigerant vapour condenses in the outer pipe of the condenser and thereby discharges heat to the water in the inner pipe. The liquid refrigerant evaporates at low pressure in the finned tube evaporator and thereby absorbs heat from the ambient air.
The hot water circuit consists of a tank, a pump and the condenser as heater. For a continuous operation the generated heat is dissipated via an external cooling water connection. The cooling water flow rate is set via a valve and measured.
Learning Objectives And Experiments
- Design and operation of an air-to-water heat pump
- Representation of the thermodynamic cycle in the log p-h diagram
- Energy balances
- Determination of important characteristic variables
- Compressor pressure ratio
- Ideal coefficient of performance
- Real coefficient of performance
- Dependence of the real coefficient of performance on the temperature difference (air-to-water)
- Operating behaviour under load
Specification
- Investigation of a heat pump with a water circuit as load
- Refrigeration circuit with compressor, evaporator with fan, thermostatic expansion valve and coaxial coil heat exchanger as condenser
- Hot water circuit with pump, tank and condenser as heater
- Additional cooling via pipe coil in the hot water tank and external cooling water
- Record and display of all relevant measured values
Technical Specification
- Compressor
- Refrigeration Capacity: 372W At 7,2/55°C
- Power Consumption: 205W At At 7,2/55°C
- Coaxial Coil Heat Exchanger (Condenser)
- Refrigerant Content: 0,55L
- Water Content: 0,3L
- Finned Tube Evaporator
- Transfer Area: Approx. 0,175m2
- Pump
- Max. Flow Rate: 1,9m3/H
- Max. Head: 1,4m
- Hot Water Tank Volume: Approx. 4,5L
- Refrigerant: R513A
- GWP: 631
- Filling Volume: 1kg
- CO2-Equivalent: 0,6t
Measuring Ranges
- Pressure: 2x -1…15bar
- Temperature: 4x 0…100°C, 2x -100…100°C
- Power: 0…6000W
- Flow Rate: 0…108L/H (Water)
- Flow Rate: 10…160L/H (Cooling Water)
- 230V, 50Hz, 1 Phase; 230V, 60Hz, 1 Phase
- 120V, 60Hz, 1 Phase
