CRC 112 / FAULT SIMULATION ON REFRIGERATION SYSTEM / REFRIGERATION / THERMAL ENGINEERING HVAC

CRC 112

FAULT SIMULATION ON REFRIGERATION SYSTEM

Teaching suggested applications*

Simulation of 18 conventional refrigeration failures
Study of the basic concept of a refrigeration installation with R134A, with double evaporator.
Study of the thermodynamic cycle of enthalpy diagram and display in real time on PC.
Calculation of cooling capacity to the condenser and evaporators.
Overall efficiency of the unit.

Description

The CRC112 bench allows the study of a low-pressure refrigeration cycle with double evaporator.

The system allows you to view the two refrigerated chambers and validate the performance difference between a positive and a negative system. Students will start up the system and do temperature readings with different operating modes.

They will analyze the data and understand what is the influence of the various components on the system.

They can view the refrigeration cycle in real time on the touch screen integrated on the machine.

They can also make troubleshooting thanks to the system that simulates 18 failures.

The robust design of this device makes it suitable for use in schools.
The equipment is set up on an Anodized aluminum frame on casters wheels. This gives it great strength and a flexibility of integration into your premises. The manufacture of this equipment complies with the European standard for machinery manufacturing.

TECHNICAL DETAILS

1. Semi hermetic reciprocating compressor :

- Fluid : R134a

- Power: 1800W (0°C / 32°C)

- Maximum operating pressure: 28bars

- Start-up pressure regulating valve (KVL) at suction

- Load regulation valve (KVC) between the discharge and suction compressor.

- Safety pressure switch HLP and LP control pressure switch

- Suction line accumulator at the suction and bottle of oil recovery at discharge

2. Condenser with forced ventilation

- Air flow rate 1700m3 /h

- Pressostatic inverter for fan speed

3. Steel liquid tank

-Volume : 2.4L

4. Dehydrator filter anti acid (X2)

- With upstream liquid sight glass

- A filter for normal operation

- A clogged filter for failure simulation

5. Liquid vapor exchanger (X1)

- An exchanger for the positive chamber placed upstream of the pressure reducer and on the return of the evaporator

- Bypass valve

6. Control solenoid valve (x2)

- For pump down control

- set up upstream of expansion valve of each chamber

7. Internal equalization thermostatic expansion valve (x2)

- One for each room

-+1 failure simulation pressure reducing valve for the positive chamber

8. Positive cold chamber with evaporator

- Exchange surface: 1.3m²

- Evaporator with forced ventilation

- Condensate collection bin on the bottom part

- Evaporation pressure control valve of KVP type

- Electronic temperature controller controlling the solenoid valve, the evaporator fan and the defrost

9. Negative cold chamber with evaporator

- Exchange surface: 1.65m²

- Evaporator with forced ventilation

- Condensate collection bin on the bottom part

- Electric defrost heater

- Defrosting system by hot gas (injection of outlet gas of the compressor in counter-current in the evaporator and return into the liquid tank with check valve )

- Electronic temperature controller controlling the solenoid valve, the evaporator fan and the defrost

10. Dual scale manometers (pressure and saturation temperature of the fluid, - 1 to 10 bar and -1 to 30 bar) diameter 80mm.

- Compressor suction pressure

- Compressor discharge pressure

- Liquid tank pressure

- Positive evaporator pressure

- Negative evaporator pressure

11. Flowmeter of refrigerant before the pressure reducing valves of each chamber (0-50Kg /h)

12. T type thermocouple temperature probes placed on the circuit and connected to the touch screen :

- Compressor suction temperature

- Compressor discharge temperature

- Condenser outlet temperature

- Expansion valve inlet temperature 1

- Expansion valve inlet temperature 2

- Evaporator temperature outlet 1 (negative)

- Evaporator temperature outlet 2 (positive)

- Chamber temperature 1 (negative)

- Chamber temperature 2 (positive)

13. Touch screen

The bench includes a touch screen that is linked to the acquisition modules and enables the following features:

- Block diagram with measurement points

- Display of measured values (pressures and temperatures)

- Activation of electrical failures

- Data recording

14. The signals of 7 temperature sensors are shown at the front side on the thermocouples connectors

- Inlet and outlet of the compressor

- Condenser outlet

- Inlet of pressure reducing valves

- Outlet of evaporators

15. The signals of two pressure sensors are shown at front side of the box on dual sink sockets :

- Compressor suction (LP)

- Compressor discharge (HP)

16. The bench is provided with a portable temperature indicator compatible with the signals of the sensors used (thermocouples type T). The connecting cables between the machine and the mobile device are provided.