Vol 91, No 9 (2002)

We compare some exploitation characterizations of the row of cool machines working on ammonia (R 717) and other refrigerants (R 22, R 134a, R 407C, R 410A, R 744, R 290) on the basis of comparison their principal thermophysical and thermodynamical properties.

The conference called "On the ways of modernization and reduction of ammonia capacity of ammonia refrigerating plants (ARP) and top-priority measures to reduce the risk of emergency situations in their operation" was held on April 2-4, 2002 in the Moscow International Complex "Molodezhny". It was organized, as well as the last year's conference on the AXU safety problems, by the Ministry of Emergency Situations of Russia, Gosgortechnadzor of Russia and GUP Giprokholod. However over the past year the acuteness of this problem has not diminished. Hundreds of operating refrigerators, cold storage plants, ice-cream factories and other enterprises using ammonia and located in densely populated urban areas still pose a potential threat to human life. This year's conference brought together about 130 representatives from 100 companies interested in solving this problem.

In the fourth quarter of 2002, YORK International launches four new models of YCAL-B refrigeration machine (in addition to the five already known), YCAL - scroll compressor refrigeration machine (HM) with air condensers. Now the range of cooling capacities of these machines is from 141 to 360 kW. All eight models are designed for outdoor installation. Both water and ethylene glycol solution are used as the refrigerant.

The modern P-series hermetic compressors can be used in any state-of-the-art refrigeration equipment. Compressors with the described volume of 10 cc per crankshaft revolution (brands RGP10AB, RGP10BB, RGP10CB, RGP10FB, RGP10PB, RGP10TB) are suitable for domestic refrigerators, but of course they can also be used in commercial equipment.

The traditional symposium with this name was held on May 29-31, 2002 in St. Petersburg State Polytechnic University (SPbGTU). It was held by the decision of the Ministry of Education of the Russian Federation. The organizer was the Chair of Compressor, Vacuum and Refrigeration Engineering of SPbGTU with the support of the University administration, Association of Compressor and Pneumatic Engineers (ASKOMP) and International Academy of Refrigeration (IARC). The Symposium was attended by 177 specialists representing 112 organizations from 53 cities of Russia, Belarus, Ukraine, Austria, UK, Germany, Lithuania, Netherlands, Poland, USA, France, Switzerland, Japan.
Among the participants - consumers of compressor equipment were enterprises of the association "Gazprom" from different regions of Russia and organizations of the same profile from Ukraine, major chemical companies, metallurgical plants, factories that produce fertilizers.
Manufacturers of compressor equipment from CIS countries were represented by large Russian compressor building plants (JSC "Compressor Complex", CJSC "Compressors BS", JSC "Compressor", JSC "Energomashkorporatsiya" - Saint-Petersburg; JSC "Borets" - Moscow, Moscow Plant "Compressor", JSC "Kazankompressormash", JSC "NIIturbocompressor", etc.), as well as Ukrainian enterprises and enterprises producing compressor equipment. The company is also engaged in the development of compressor equipment for conversion purposes, as well as Ukrainian enterprises (JSC VNIIkompressormash, JSC SMNPO named after M.V. Frunze - Sumy, JSC Melkom - Melitopol, etc.) and defense enterprises involved in the development of compressor equipment.

In recent years, air conditioning systems (VAV systems) with variable supply and exhaust air flow have become widespread in office buildings in the USA. Using a six-story, 17,300 m2 office building in Philadelphia as an example, the capital and operating costs of a VAV system and a system with ceiling chillers and minimum supply air are compared. The calculated air capacity of the VAV system is 265400 m3/h and the cooling consumption is 1780 kWh.