Thermodynamics Of The Refrigeration Circuit

Thermodynamics Of The Refrigeration Circuit

Model: SR2014

Learning Objectives / Experiments

– cyclic process in the log p-h diagram

– comparison of the real cyclic process and the ideal cyclic process

– energy 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

[1] thermodynamic investigation of a refrigeration circuit

[2] refrigeration circuit with open compressor, watercooled condenser, thermostatic expansion valve and indirectly heated evaporator

[3] compressor drive with speed-controlled motor via V-belt

[4] motor on pendulum bearing for torque measurement

[5] tube evaporator with hot water circuit as cooling load

[6] water-cooled coaxial coil heat exchanger as condenser

[7] displays for temperature, pressure, flow rate, speed, torque and power at the equipment

[8] software for data acquisition via USB under Windows Vista or Windows 7

[9] refrigerant R134a, CFC-free

Technical Data

Open compressor

– refrigeration capacity: approx. 550W (at a speed

of 500min-1 and -10/20°C)

– motor: 550W, 1.400min-1

Heater: 1x 1.000W

Condenser

– capacity: 1.300W

Measuring ranges

– temperature: 9x -30…100°C, 1x 0…100°C

– pressure: 1x -1…9bar, 1x -1…24bar, 2x -1…15bar

– torque (compressor): 0…10Nm

– speed (compressor): 0…2.500min-1

– power consumption (compressor): 0…1.125W

– power (heater): 0…1.125W

– flow rate (water): 5…70g/s

– flow rate (refrigerant): 0…0,5L/min

Dimensions and Weight

LxWxH: 1.520x790x1.760mm

Weight: approx. 120kg

Required for Operation

230V, 50/60Hz, 1 phase

Water connection