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Products | Thermodynamics, Heating and Sanitary Systems | Refrigeration and Air Conditioning | ET 428

ET 428

Multiple Compressor Refrigeration Control

Technical Description

In high capacity refrigeration systems several compressors are often used in combination. This compound system is controlled via a regulator so that individual compressors can be switched in, depending on the performance required. During this process it is automatically ensured that the compressors are evenly loaded. Using the compound controller it is also possible to compare the energies during individual and combined operation, as the power consumption of the compressors in operation can be read on the controller. A cooling load can be applied to the evaporator in the system using a heater in a closed brine circuit. The measurement of all relevant process parameters with electronic sensors allows the data to be acquired by a PC. A data acquisition card and analysis software is included. All measured data can be simultaneously read on the system so operation is also possible without a PC.
The system requires a supply of threephase mains electricity.

Learning Objectives / Experiments

· Combined operation of compressors:
- Power measurement
- Function of a compound controller
- Comparison of the energy for operating individual
and multiple compressors
· Effect of the airflow rate on the condenser
performance
· Effect of refrigerant supercooling
· Observation of oil return
· Cyclic process on the p-h state diagram

Features

Refrigeration system for the demonstration of the combined operation of compressors
Familiarisation with a compound controller
Recording measured values with electronic sensors
Processing of the measured data on a PC

Alternative products

ET 165 -- Experimental Module Refrigeration System
ET 422 -- Commercial Refrigeration Unit with Fault Simulation
ET 426 -- Capacity Control Methods in Refrigeration

Specification

[1] Mobile refrigeration system to demonstrate the combined operation of compressors
[2] Control of compressors via compound controller
[3] Condenser with speed-controlled fan
[4] Closed brine circuit with heater
[5] Electronic sensors record measurement data
[6] PC data acquisition with LabView software under Windows NT/2000/XP
[7] Coaxial evaporator with expansion valve
[8] Observation of oil return by means of sight glasses in the pipes
[9] Refrigerant R134a, CFC-free
[10] l x w x h 1800x700x1900m, 300kg
[11] 400V, 50Hz, 3 phase

Technical Data

Air-cooled compressor compound with 3 hermetic compressors: power consumption: 1.7kW, refrigeration capacity: 2640W at -10/32°C, max. airflow rate: 2500m³/h, collector: 5.5ltr
Condenser with fan: capacity: 4.1kW, max. airflow rate: 1250m³/h
Coaxial evaporator with expansion valve: capacity: 4kW at ΔT=9K, 0.6m³/h brine flow rate
Brine circuit: glycol tank: 23ltr, heater: 3kW, pump: 3 stages, Q_max: 3.6m³/h, p_max: 6m
Sensors for temperature, pressure, power, flow rate

Dimensions and Weight

l x w x h : 1800 x 700 x 1900 mm
Weight : approx. 300 kg

Connections

400V, 50Hz, 3 phase

Scope of Delivery

1 system, 1 data acquisition card with software, 1 instruction manual

Order Details

061.42800 ET 428 Multiple Compressor Refrigeration Control