Thermodynamics Of The Refrigeration Circuit

Categories: Engineering Lab Equipment

In this trainer, great care was taken to make the thermodynamic processes in the refrigeration system as transparent as possible. The capacities of compressor, evaporator and condenser can be measured...


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In this trainer, great care was taken to make the thermodynamic processes in the refrigeration system as transparent as possible. The capacities of compressor, evaporator and condenser can be measured. Pressure and temperature measuring points are located at all the relevant locations to also allow for the pressure and heat losses in a refrigeration system to be investigated in detail. The refrigeration circuit of contains an open compressor with variable speed, a water-cooled condenser, a thermostatic expansion valve and an evaporator heated by a hot water circuit. The compressor is driven via a pendulum bearing motor with frequency converter for speed adjustment. A force transducer permits the measuring of the drive torque. Using the speed the mechanical drive power of the compressor can thus be determined. The electrical heating power of the hot water circuit can be freely adjusted and is displayed. The condenser capacity is measured via the cooling water flow.

 

Learning Objectives/Experiments

Cyclic process in the log p-h diagram

Comparison of the real cyclic process and the ideal cyclic process

Balances at the evaporator and condenser

Calculation of the motor power via speed and torque

Determination of losses

Calculation of the coefficient of performance

Operating behaviour under load

Non-steady-state operating behaviour

Specification

Thermodynamic investigation of a refrigeration circuit

Refrigeration circuit with open compressor, water-cooled condenser, thermostatic expansion Valve and indirectly heated evaporator

Compressor drive with speed-controlled motor via V-belt

Motor on pendulum bearing for torque measurement

Tube evaporator with hot water circuit as cooling load

Water-cooled coaxial coil heat exchanger as condenser

Displays for temperature, pressure, flow rate, speed, torque and power at the equipment

 

Technical Data

Open compressor

refrigeration capacity: approx. 965W (at a speed of 1450min-1 and 5/40°C)

Heater: 1x 1000W

Condenser, capacity: 1300W

Refrigerant

R513A, GWP: 631, filling volume: 2kg, CO2-equivalent: 1,3t

Measuring ranges

temperature: 9x -30…100°C, 1x 0…100°C

pressure: 1x -1…9bar, 1x -1…24bar, 4x -1…15bar

torque: (compressor) 0…10Nm

speed: (compressor) 0…2500min-1

power consumption: (compressor) 0…1125W

power: (heater) 0…1125W

flow rate: (water) 5…70g/s

flow rate: (refrigerant) 0…0,5L/min

230V, 50Hz, 1 phase

230V, 60Hz, 1 phase; 230V, 60Hz, 3 phases

 


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quick overview :

In this trainer, great care was taken to make the thermodynamic processes in the refrigeration system as transparent as possible. The capacities of compressor, evaporator and condenser can be measured. Pressure and temperature measuring points are located at all the relevant locations to also allow for the pressure and heat losses in a refrigeration system to be investigated in detail. The refrigeration circuit of contains an open compressor with variable speed, a water-cooled condenser, a thermostatic expansion valve and an evaporator heated by a hot water circuit. The compressor is driven via a pendulum bearing motor with frequency converter for speed adjustment. A force transducer permits the measuring of the drive torque. Using the speed the mechanical drive power of the compressor can thus be determined. The electrical heating power of the hot water circuit can be freely adjusted and is displayed. The condenser capacity is measured via the cooling water flow.

 

Learning Objectives/Experiments

Cyclic process in the log p-h diagram

Comparison of the real cyclic process and the ideal cyclic process

Balances at the evaporator and condenser

Calculation of the motor power via speed and torque

Determination of losses

Calculation of the coefficient of performance

Operating behaviour under load

Non-steady-state operating behaviour

Specification

Thermodynamic investigation of a refrigeration circuit

Refrigeration circuit with open compressor, water-cooled condenser, thermostatic expansion Valve and indirectly heated evaporator

Compressor drive with speed-controlled motor via V-belt

Motor on pendulum bearing for torque measurement

Tube evaporator with hot water circuit as cooling load

Water-cooled coaxial coil heat exchanger as condenser

Displays for temperature, pressure, flow rate, speed, torque and power at the equipment

 

Technical Data

Open compressor

refrigeration capacity: approx. 965W (at a speed of 1450min-1 and 5/40°C)

Heater: 1x 1000W

Condenser, capacity: 1300W

Refrigerant

R513A, GWP: 631, filling volume: 2kg, CO2-equivalent: 1,3t

Measuring ranges

temperature: 9x -30…100°C, 1x 0…100°C

pressure: 1x -1…9bar, 1x -1…24bar, 4x -1…15bar

torque: (compressor) 0…10Nm

speed: (compressor) 0…2500min-1

power consumption: (compressor) 0…1125W

power: (heater) 0…1125W

flow rate: (water) 5…70g/s

flow rate: (refrigerant) 0…0,5L/min

230V, 50Hz, 1 phase

230V, 60Hz, 1 phase; 230V, 60Hz, 3 phases

 

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