Vol 93, No 9 (2004)

A possibility of use of turborefrigerators of type ATR working on the principle of the air refrigeration cycle for food technological processes is considered. The characteristics of turborefrigerators and turbo-detanders whose standard sizes were adapted to parametric range of screw compressors are presented.

On the basis of ATR and appropriate compressors the air refrigerating units ARA are created, that have become the basis for freezing-refrigerating-thermal stations (MHTS) producing cold for quickfreezing apparatuses and also low potential heat.

Characteristics of a tunnel quick-freezing apparatus STAB, which obtains refrigeration from turborefrigerator are given, and its comparison with other types of tunnel apparatuses is carried out.

Let me introduce you the manufacturer of air coolers and air-cooled condensers, Goedhart Cooling Equipment B. V. and its subsidiary Goedhart Bohemia. Our equipment can be found on every continent, on land and sea, in the air on airplanes and in space (several meters of heat exchange surface were manufactured by the Goedhart factory for the Skylab space laboratory).

The magazine “Refrigeration Technology” (No. 5/2004) told about the design, manufacture and commissioning of test climatic chambers carried out by the company “Frigodesign”. The article published in this issue is devoted to another area of ​​the company's activity - the design, supply of equipment and assembly of multi-compressor refrigeration systems for warehouses and storage terminals for frozen and chilled products. At one of the recently commissioned terminals, the Frigodesign company installed a monitoring system for remote control of the temperature regime in the chambers and control of the operation of refrigeration equipment from a remote computer

Plate freezers are widely used for freezing seafood, vegetables, meat products, fruit pulp and concentrates, ready meals.

New standards with regards to systems of heating, ventilation, air conditioning and building climatology introduce considerable changes when choosing the regimes of preparation ofthe conditioned air. A higher humidity of the outside air design parameters has required obligatory use of the regimes of refrigeration and drying of the inlet outside air. Based on the use of York equipment, energy efficient air conditioning systems are being developed.

The calculated air temperatures in the serviced area of the premises are determined depending on their purpose in accordance with tables 9 and 10, both for the cold and for the warm period of the year. In the operating room, the air temperature is not more than 22 °C. The relatively low temperature is explained by the increase in the concentration of bacteria during operations and the deterioration in the heat transfer of personnel due to the use of rubber gloves and masks with increasing temperature.

Pressure switches must protect the refrigeration plant from too high discharge pressure and low compressor suction pressure. Increasing the discharge pressure above a certain value can lead to an accident: destruction of the refrigeration unit, jamming of the compressor, burning of electrical windings. Significant reductions in suction pressure impair oil return to the compressor and may also freeze water or ethylene glycol in chillers.