Refrigeration

There is hardly any part of a country’s health and welfare that is not dependent on refrigeration systems. For example, food and vaccine storage, distribution, medical, industrial, commercial and domestic applications of all kinds depend upon refrigeration.

During the 1990’s almost all countries signed and subsequently ratified the United Nations Montreal Protocol and its later amendments. This agreement includes a strict time-scale for the worldwide phase-out of ozone depleting refrigerants and requires the use of interim and replacement, ozone friendly refrigerants. These changes resulted in a 3 to 4 fold increase in the variety of refrigerants in common usage and the need to ensure that the training of refrigeration engineers is to the highest standard.

The recent signing of the Kyoto Agreement will further increase the need for training as most refrigeration and air conditioning systems are significant users of power and hence contribute directly and indirectly to global warming.

The company’s range of refrigeration teaching units and computer based software are designed to teach students all the basic principles of refrigeration, therefore ensuring that the next generation of engineers are able to fully understand and contribute to the fundamental changes now taking place in the refrigeration industry.


	R434 Vortex Tube Refrigerator A fully instrumented bench top vortex tube refrigerator having no moving parts and requiring only a compressed air or other suitable gas supply to operate. These units are normally used in specialised cooling applications where simplicity, reliability and compactness are required. From compressed air at ambient temperature and a high speed rotating vor tex, the unit produces air temperatures down to -20°C, can perform 75 watts of cooling and discharges a hot air stream at up to 70°C.


	Data sheet

R534 Thermo-Electric Heat Pump
A fully instrumented semi-conductor thermo-electric device demonstrating both power generation and refrigeration from the same bench mounted module.

To demonstrate power generation a low voltage electric heater provides the high temperature energy source, with the DC voltage being supplied by an internally mounted power supply. When the same DC power is supplied to the device, a heat pump or refrigerating effect is generated depending upon voltage polarity.

Used in specialised applications including the cooling of high performance electronics the unit teaches the refrigeration technologies relating to thermo-electric devices.These include: Refrigeration Effect, Generating Effect, Heat pump Effect, Lenz and Seebeck Effects.


	Data sheet

R514 Mechanical Heat Pump
A unit illustrating the circuit of a commercial and domestic type heat pump in which free low grade heat from the atmosphere is upgraded and delivered at an elevated temperature for hot water or space heating.

Standard refrigeration components are used that are all visible and logically arranged on the bench-mounted panel. Instrumentation is provided for the measurement of refrigerant and water mass flow rates, temperatures, refrigerant pressures and electrical power consumed by the compressor. A computer linked upgrade for the unit is available.


	Data sheet

R633 Refrigeration Cycle Demonstration Unit
A bench top vapour compression refrigeration unit fitted with a hermetic compressor, water-cooled flooded glass condenser and evaporator both of similar construction. The unit operates on a low pressure, non-toxic, ozone friendly refrigerant and thereby allows both evaporation and condensation to be safely observed by the students.

Standard instrumentation enables the measurement of all important pressures, temperatures and flow rates. An optional digital temperature indicator upgrade allows plotting of the refrigeration cycle on a pressure-enthalpy diagram. An optional digital wattmeter provides measurement of electrical power input to the compressor and the ability to calculate the Coefficient of Performance (C.O.P.).


	Data sheet

R714 Refrigeration Laboratory Unit
A fully instrumented bench top vapour compression refrigerator with a belt driven compressor, water cooled condenser and variable electrically heated evaporator load. An integral dynamometer allows motor shaft power to be determined. Comprehensive instrumentation allows generation of a complete refrigeration cycle diagram as well as individual component and complete system energy balances.

An optional computerised data acquisition system is available that may be supplied factory fitted or installed as a user upgrade. The Windows software is menu driven and allows data files to be exported to Excel or other spread sheet formats for evaluation and presentation.


	Data sheet