R715 Refrigeration Laboratory unit

R715 Refrigeration Laboratory unit

A fully instrumented refrigerant R134a vapour compression refrigerator with belt driven compressor, electrically heated evaporator, thermostatic expansion valve and water cooled condenser. Operating parameters can be varied by adjustment of condenser cooling water flow and electrically heated evaporator supply voltage. Components have a low thermal mass resulting in immediate response to control variations and rapid stabilisation. Instrumentation includes all relevant temperatures, condenser pressure, evaporator pressure, refrigerant and cooling water flow rates, evaporator and motor power, motor torque and compressor speed.

Instrumentation includes:-  A multi point Digital Thermometer; Digital Wattmeter, Evaporator power controller; Variable Area Flowmeters (2) to record R134a and water flow rates; Pressure Gauges: (2) to indicate R134a pressure in evaporator and condenser; Spring Balance and Tachometer allow measurement of power required to drive the compressor;

Expansion Valve: Thermostatically controlled type.

Evaporator: Electrically heated device.

Compressor: (Internally mounted) Twin cylinder belt driven unit.

Safety: Condenser pressure and evaporator heater temperature limited by automatic cutouts. All electrical components connected to common earth. Unit protected by miniature circuit breaker and residual current circuit breaker

R715 Refrigeration Laboratory unit

Instrumentation includes all relevant temperatures, condenser pressure, evaporator pressure, refrigerant and cooling water flow rates, evaporator and motor power, motor torque and compressor speed.

 Panel: High quality glass reinforced plastic on which the following components are mounted.

Refrigerant: R134a

Digital Thermometer:  6 way type K indicator with 0.1ºC resolution.

Wattmeter: Allows measurement of the power input to either evaporator or motor.

Voltage Controller: To vary evaporator load.

Variable Area Flowmeters:  (2) Variable area types to indicator R134a and H20 flow rates.

Pressure Gauges: (2) to indicate R134a pressure in evaporator and condenser.

Spring Balance and Tachometer: Together allow measurement of power required to drive the compressor.

Expansion Valve: Thermostatically controlled type.

Evaporator: Electrically heated device.

Compressor: (Internally mounted) Twin cylinder belt driven unit.

Safety: Condenser pressure and evaporator heater temperature limited by automatic cutouts. All electrical components connected to common earth. Unit protected by miniature circuit breaker and residual current circuit breaker.

 

  • Production of a vapour compression cycle diagram under various conditions.
  • Production of an energy balance for the refrigerator.
  • Investigation of the variation in refrigerator “duty” or cooling ability for various condensing temperatures.
  • Investigation of the variation in refrigeration Coefficient of Performance for the various condensing temperatures.
  • Investigation of the variation in Coefficient of Performance based on electrical, shaft and indicated power.
  • Determination of the overall heat transfer coefficient for the condenser cooling coil.
  • Investigation of the performance of the thermostatic expansion valve.
  • Investigation of the heat delivered to the cooling water with variation in condensing temperature.
  • Investigation of the Coefficient of Performance as a Heat Pump for various condensing temperatures.
  • Investigation of power input based on electrical, shaft and indicated power.

 

Electrical:

A: 2.5Kw 220-240 Volts, Single Phase  50Hz (With earth/ground).

   OR

B:  2.5kW 110-120 Volts, Single Phase, 60Hz (With earth/ground).

  OR

C:  2.5kW 220 Volts, Two Phases, 50/60Hz (With earth/ground).                                            

Water:    

3 litres/min at 24m head