Energy Efficiency In Refrigeration Systems

Energy Efficiency In Refrigeration Systems

Model: SR2022

Learning Objectives / Experiments

– Variables affecting energy efficiency

* controller parameters

* refrigerant supercooling

– Interconnected operation of compressors

– Operation of a multicompressor controller

– Methods for returning oil in a multicompressor refrigeration system

– Representation of the thermodynamic cycle in the log p-h diagram

Specification

[1] Refrigeration system in multicompressor operation to investigate energy efficiency

[2] Refrigeration circuit with 3 compressors connected in parallel, condenser, thermostatic expansion valve and coaxial coil heat exchanger as evaporator

[3] Heat exchanger for refrigerant supercooling can be added via valves

[4] Glycol-water circuit includes pump and tank with heater serving as cooling load at the evaporator

[5] Multicompressor controller for the parallel operation of the compressors

[6] Separation of oil from the refrigerant on the delivery side and return to the intake side of the compressors

[7] Fan at the condenser with adjustable speed

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

[9] Refrigerant R134a, CFC-free

Technical Data

3 compressors

– refrigeration capacity: each 1584W at -10°C/55°C

– power consumption: each 1156W at -10°C/55°C

Condenser with fan

– capacity: 4100W

– air flow: 1250m³/h

Coaxial coil heat exchanger capacity

– 4kW at ΔT=9K; 0,6m³/h glycol-water mixture

Glycol-water mixture pump

– max. flow rate: 5m³/h

– max. head: 6m

Heater power: 3kW

Tank

– glycol-water mixture: 23L

– refrigeration circuit receiver: 5,8L

Measuring ranges

– temperature: 4x 0…100°C, 4x -100°C…100°C

– pressure: 1x -1…9bar, 1x -1…24bar

– flow rate: 1x 1..25L/min

– compressor power: 0…4995W

Dimensions and Weight

l x w x h: 1800x700x1900mm

Weight: approx. 300kg

Connections

400V, 50/60Hz, 3 phases