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 ET 419 Heat Transfer in a Refrigeration System
 Technical Description
Refrigeration systems and heat pumps are similar in design, the former is used for cooling while the latter is used for heating. The compact and clearly laid out benchtop unit is a fully functional example of a typical refrigeration system or heat pump. It has a water-cooled condenser and a water-heated evaporator. The refrigerant is compressed and then transfers heat to the cooling water flowing through the condenser. The refrigerant is expanded via the expansion valve and absorbs heat from hot water pumped through the evaporator. The hot water is heated electrically in a collector. The heat transferred from and to the water circuits can be determined with the aid of temperature and flow rate measuring devices.
The unit requires a supply of cooling water.
Learning Objectives / Experiments
- Familiarisation with the function and components of
a refrigeration system and heat pump
- Determination of the energy balances
- Depiction of the thermodynamic cycle
- Operating states for refrigeration systems
 Features
* Compact table unit with all components from
refrigeration engineering
* All parameters necessary for the cyclic process can
be read directly on the unit
 Alternative products
ET 103 -- Heat Pump with Pumpdown Control
 Specification [1] Model of a refrigeration system with closed water circuit that is used as a cooling load[2] l x w x h: 1000x600x1050mm, 100kg[3] Hot water circuit with tank, heater, pump and temperature controller[4] Hermetic piston compressor[5] Coaxial evaporator and condenser[6] Heater 300W[7] Sight glass in the refrigerant circuit[8] Instrumentation: bimetallic thermometers and rotameters[9] Refrigerant R134a[10] 230V, 50Hz, 1 phase Technical Data Compressor: power consumption: 150W at -10°C, refrigerating capacity: 280W at 0/32°CCoaxial tube heat exchanger: capacity: 2kW at 45°C condensing temperature, DT=7KCirculating pump, 3 stages: 30-45-60W, max. flow rate: 2.9m³/h, max. head: 4m Heater 300WInsulated water tank: 4.5ltrMeasuring ranges:- temperature: 4x 0...60°C- flow rate: 2x 0...33ltr/h Dimensions and Weight l x w x h : 1000 x 600 x 1050 mmWeight : approx. 40 kg Connections 230V, 50Hz, 1 phaseWater supply Scope of Delivery 1 complete unit, 1 instruction manual Order Details 061.41900  ET 419  Heat Transfer in a                      Refrigeration System