Vol 92, No 8 (2003)

The potentials of use of low ambient temperatures, typical of the winter period in Russia, in the heat-and-power engineering and refrigeration engineering have been considered in the article. It is known from thermodynamics that in Carnot direct cycle a decrease in the temperature of heat receiver is advantageous from the energy point of view, while in Carnot refrigeration cycle — a decrease in the condensing temperature is beneficial. In practice this can be rather easily implemented in refrigeration technique by supplying cold outside air to condensers of refrigerating installation. In steam power cycles a decrease in temperature level is associated with the necessity to change the traditional working substance — water. In this case use of Kalina water-ammonia cycle has good prospects. The problems associated with the transition to air condensers can be fully overcome.

Refrigeration system of the integral high-frequency motor of centrifugal compressors for water-chilling machines are compared in the article. The schemes of refrigeration by refrigerant vapor removed from the cycle on the level of suction pressure into the compressor and on the level of compressor pressure after the first stage, as well as the scheme of refrigeration with the help of water jacket are considered in detail. It is shown that refrigeration through heat removal with the help of water jacket is the most efficient, with the efficiency rising with decreasing of pressure in the area of drive and of the molecular mass of the refrigerant. In general refrigeration with refrigerant vapor circulating in the system is always more advantageous from the energy point of view, than the supply of additional amount of liquid refrigerant.

Howden Compressors specializes in the production of screw oil-injected refrigeration and gas compressors, on the basis of which the company SES International BV produces compressor units and complex refrigeration equipment.

Since the mid-50s over 7000 FRIGOSCANDIA refrigeration systems for various applications, including about 40 in Russia and the former Soviet Union, have been manufactured, assembled and put into operation all over the world.
ThermoCool Group of Companies, which has been offering its products to the Russian refrigeration market for 5 years, is a partner of FRIGOSCANDIA and deals with the design, delivery, installation and commissioning of FRIGOSCANDIA quick-freezing equipment for the food industry.

The Irkutsk Cold Storage Plant was put into operation in 1958. (the ice cream factory went into operation in 1960), has a total conditional capacity of 19645 tons, including the capacity of negative temperature chambers of 11739 tons. The ice-cream factory performs operations of acceptance, storage and shipment of goods, rents out refrigerated chambers, and produces ice cream. The refrigeration plant was reconstructed between 1993 and 1996, but was not completed. In 2002 with the coming of the new owner reconstruction and modernization of the ammonia refrigerating plant (ACP) according to the project of Odessa Institute of Low Temperature Equipment and Energy (1995) was resumed.