DESCRIPTION

The RA4 is a standalone desktop refrigeration demonstrator based upon a vapour-compression refrigeration system (VCRS).

The most common refrigeration system used today, this is where the refrigerant undergoes phase changes to absorb and reject heat in a controlled manner.

The RA4 is designed to enable the student to gain an understanding of the fundamental components and operation of a refrigeration/ air conditioning system. It is self contained and powered by a domestic 13amp supply.

The control panel comprises standard refrigeration gauges as used by a service technician. There are also indicators to show the status of the low-pressure, medium-pressure and high-pressure system safety switches. Indicators show the compressor running status.

Many of the components used are automotive but the process is the same in vehicle, building services and refrigeration units. A DC compressor has been selected to provide drive (due to its low voltage) low-noise operation against an automotive-style belt-driven compressor typical of high-current AC motors.

The principles shown relate to any form of heat exchanger that may use vapour-compression refrigerant within its process.

EXPERIMENTAL CONTENT

• Demonstration of component function
• Instrumented running conditions showing refrigeration pressures
• Performance under running and fault conditions
• Fault training through interchangeable fault condition switches

FEATURES & BENEFITS

FEATURES

• Desktop vapour pressure air conditioning system for training using R134a refrigerant
• Hermetically sealed refrigerant compressor with: – Integral low-voltage three-phase DC motor – Quiet and vibration-free operation
• Condenser assembly to cool the refrigerant incorporating: – Multi-pass condenser coil with aluminium fins – DC cooling fan
• Evaporator assembly to cool and dehumidify the air incorporating: – Thermal expansion valve – Evaporator coil with fins – Centrifugal air blower with three switched speeds
• Three temperature displays indicating: – Air temperature before evaporator coil – Air temperature after evaporator coil – Refrigerant temperature in condenser coil
• Built-in refrigerant Bourdon gauges on compressor suction and discharge lines with combined temperature and pressure scales
• System includes receiver, filter/dryer, sight glass and high/low-pressure cut-outs for safe operation
• High and low-pressure charging points enable operator training in addition to recharging
• Demonstration/analysis of faults injected in the refrigerant circuit via three selector switches: – Blocked/faulty TXV (thermal expansion valve) – Blocked condenser pipework – Condenser fan fault
• Three pressure switches with indicators showing low or high pressure under fault conditions and medium pressure in normal operation
• No additional computer or diagnostic tools are required
• Operated from mains power supply but all components are 24V DC for improved operator safety
• Comprehensive instruction manual with details of installation, operating procedures and sample teaching exercises including fault insertion and analysis

BENEFITS

• Standalone desktop refrigeration system
• Built-in temperature and pressure gauges as used by service technicians
• Fault training through interchangeable fault condition switches
• Low voltage DC compressor and control circuit
• Quiet operation for classroom use without the need for additional drive motors and noisy belt-driven compressors
• No additional computers or diagnostic tools are required

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