Учебное оборудование основы измерения влажности компрессор профессиональное холодильное учебное

* Refrigeration system with 2 different evaporation pressures1

* Simulation of 18 faults

Technical Description

Identifying faults in refrigeration systems requires comprehensive

knowledge This knowledge also includes the design and purpose of the

individual components. helps to acquire this knowledge.

The components of a refrigeration circuit with refrigeration and freezing

chambers are arranged clearly in the trainer. Solenoid valves enable the

individual or parallel operation of the evaporators in the two chambers.

The circuit is equipped with a combined pressure switch for the delivery

and intake side of the compressor. The refrigeration chamber features an

evaporation pressure controller. The effect of the evaporation pressure

controller on the overall process is being examined. An inner heat

exchanger in the inlet of the two evaporators is used for supercooling the

refrigerant to increase the efficiency of the process. At the same time the

intake gas is superheated.

An electric defrost heater is available to defrost the freezing chamber.

The simulation of 18 different faults, e.g. faulty solenoid valves or faulty

relays, is provided for.

The process schematic at the trainer offers a quick overview. Signal

lamps in the process schematic indicate the operating state of selected

Components.

Relevant measured values are recorded by sensors. The measured values can be read on digital displays. At the same time, the measured values can also be transmitted directly to a PC via USB. The data acquisition software is included.

The most important pressures are additionally indicated with manometers directly at the trainer. The software enables the representation of the cyclic process in the log p-h diagram.

The well-structured instructional material sets out the fundamentals and provides a step-by-step guide through the experiments.

Learning Objectives / Experiments

- design and components of a refrigeration system with 2 evaporators

- components and their functions

* compressor, condenser, evaporator

* thermostatic expansion valve

* evaporation pressure controller

* pressure switch

* electric defrost heater

- thermodynamics of the refrigeration cycle

* effect of refrigerant supercooling

* representation of the thermodynamic cycle

in the log p-h diagram

* determination of important characteristic variables

* coefficient of performance

* refrigeration capacity

* compressor work

- fault finding in refrigeration system components

Specification

[1] investigation of a refrigeration system with refrigeration and freezing chambers

[2] refrigeration circuit with compressor, condenser

and 2 evaporators with thermostatic expansion valve and evaporation pressure controller

[3] insulated freezing chamber with fan and electric defrost heater

[4] insulated refrigeration chamber with evaporation pressure controller

[5] heat exchanger for refrigerant supercooling

[6] individual or parallel operation of the chambers via solenoid valves

[7] simulation of 18 faults

[8] software for data acquisition via USB under Windows Vista or Windows 7

[9] refrigerant R134a, CFC-free

Technical Data

Compressor

- power consumption: 491W at 5/40°C

- refrigeration capacity: 1104W at 5/40°C

Condenser with fan

- volumetric air flow rate: 290m³/h

- transfer area: 1,5m²

Refrigeration chamber

- evaporator transfer area: 1,06m²

Freezing chamber

- evaporator transfer area: 2,42m²

- volumetric air flow rate, fan: 135m³/h

- electric defrost heater: approx. 150W

Evaporation pressure controller: 0...5,5bar

Measuring ranges

- temperature: 12x -50...120°C

- pressure: 1x -1...15bar, 3x -1...9bar, 3x -1...24bar

- power: 0...1125W

- flow rate: 1,5...23,5L/h

Dimensions and Weight

LxWxH: 2000x670x1900mm

Weight: approx. 210kg

Required for Operation

230V, 50/60Hz, 1 phase or 120V, 60Hz/CSA, 1 phase

Scope of Delivery

1 trainer

1  software CD + USB cable

1 set of instructional material