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Products | Thermodynamics, Heating and Sanitary Systems | Refrigeration and Air Conditioning | ET 419

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°C
Coaxial tube heat exchanger: capacity: 2kW at 45°C condensing temperature, DT=7K
Circulating pump, 3 stages: 30-45-60W, max. flow rate: 2.9m³/h, max. head: 4m
Heater 300W
Insulated water tank: 4.5ltr
Measuring 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 mm
Weight : approx. 40 kg

Connections

230V, 50Hz, 1 phase
Water supply

Scope of Delivery

1 complete unit, 1 instruction manual

Order Details

061.41900 ET 419 Heat Transfer in a
Refrigeration System