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Products | Thermodynamics, Heating and Sanitary Systems | Refrigeration and Air Conditioning | ET 422

ET 422

Commercial Refrigeration Unit with Fault Simulation

Technical Description

The system contains a normal cooling circuit and a deep-freezing circuit. Both are supplied from a powerful piston compressor. The unit is equipped with a capacity control regulator, evaporation and intake pressure regulator, heat exchanger, oil separator, starting controller, defrosting heater and many other features of industrial refrigeration systems. The measured data from electronic sensors can be forwarded to a data acquisition card and processed by a PC. Integrated into the system are 25 fault circuits, these simulate typical problems that occur on refrigeration systems. The faults can be activated using pushbutton switches.
A three-phase mains supply is required for operation.

Learning Objectives / Experiments

- Familiarisation with the basic layout of a
refrigeration system with a normal cooling stage
and a deep-freezing stage
- Familiarisation with the key components of a
refrigeration system and their function
- Fault simulation, fault-finding and fixing
- Illustration of the cyclic process on a p-h state
diagram
- Basic thermodynamic calculations, such as
refrigerating capacity, mechanical and thermal
efficiency, energy balances, etc.
- Single and parallel operation of cooling stages

Features

* Refrigeration system with PC measured data
acquisition₁
* Refrigeration circuit with cooling and deep-freezing
stages₁
* Clearly laid out on laboratory trolley₁
* Usage of industrial component

Alternative products

ET 405 -- Reverse Cycle Refrigeration Training System
ET 412C -- Industrial Refrigeration Trainer / PC
ET 426 -- Capacity Control Methods in Refrigeration
ET 428 -- Multiple Compressor Refrigeration Control

Specification

[1] Mobile refrigeration unit with normal cooling stage and deep-freezing stage
[2] Selection of cooling stage via solenoid valves
[3] Individual and parallel operation of the cooling stages possible
[4] Cooling stages: insulated chambers with air-cooled evaporators
[5] PC data acquisition with LabView software under Windows XP
[6] 25 fault circuits
[7] Semi-hermetic piston compressor, air-cooled condenser
[8] Refrigerant R22
[9] l x w x h 2200x770x1900mm, 280kg

Technical Data

Compressor

- power consumption: approx. 1370W

- refrigerating capacity: 2080W at -10/40°C
Condenser with fan

- capacity: 1935W

- heat exchanger surface area: 2.5m²
Normal evaporator with fan

- capacity: 78W

- heat exchanger surface area: 1.12m²
Deep-freezing evaporator with fan

- capacity: 130W

- heat exchanger surface area: 1.88m²

- with defroster: 75W

All fans are speed-controlled

Dimensions and Weight

l x w x h : 2200 x 770 x 1900 mm
Weight : approx. 280 kg

Connections

400V, 50Hz, 3 phase or 230V, 60Hz, 3 phase

Scope of Delivery

1 refrigeration system

1 data acquisition card with software

1 instruction manual

Order Details

061.42200 ET 422 Commercial Refrigeration Unit
with Fault Simulation