• Description

This trainer is designed for the study of industrial refrigeration whose main aim consists in controlling the temperature and relative humidity of one or more cold rooms.

In this case a unique compressor and a unique condenser are used for two different cold rooms: one for frozen products and the other for fresh products.

This trainer is also conceived to identify and analyze the behaviour of all the critical components of the cycle.
Users’ attention is focused onto important issues concerning the balancing of valves and the keeping of constant operating pressures versus the external and internal load conditions.

Plant starting and safety devices intervention checking
Studying the operation of a thermostatic expansion valve and its calibration
Studying the operation of an evaporating pressure controller and its calibration
ON-OFF control: Refrigerated room thermostat
Correlation between evaporation temperature, room temperature and relative humidity in positive-temperature rooms
Analyzing the system behaviour versus the variation of:
- thermostatic valve superheats
- condenser air fl ow
- evaporating pressure controller working point

Using the refrigerant pressure-enthalpy diagram as work and diagnosis tool: plotting the refrigeration cycle
Data acquisition and calculation of:
- heat balances corresponding to evaporator, condenser,compressor
- refrigerant mass fl ow
- ideal and actual EER
- volumetric compression effi ciency and its trend versus compression ratio
- condenser exchange surface
- heat transfer coeffi cient between air and refrigerant in the condenser
- heat losses through the room walls