Vol 90, No 2 (2001)
Articles
Products of the Circassian JSC "Holodmash"
Abstract
OJSC “Kholodmash” (Cherkessk), the successor of the Cherkessk plant of refrigeration engineering, serially produces on the basis of reciprocating stuffing box and glandless compressors of types P25, P50, P100, PB25, PB50, PB100 unified series of freon (R22) and ammonia single-stage complex compression refrigeration machines, compressor-condensing, compressor units, covering the range of refrigeration capacity of 25 ... 180 kW at nominal modes.
4-5
Test results of the first domestic glandless scroll refrigeration compressors on a calorimetric stand
Abstract
Test results of a scroll compressor are presented, its applications are recommended. The characteristics of the studied compressors andforeign counterparts are compared. Comparison of characteristics of scroll compressors has shown that as to the energy parameters, the domestic compressors are on the same level with their foreign counterparts. The compressor is suitable for use in refrigerating machines working on R22 with evaporating temperature range from —25 to +5 °C and condensation temperatures up to 50 °C, as well as in industrial air conditioners. To reduce the discharge temperature it is necessary to supply liquid refrigerant into the pressure space of the compressor.
6-7
Training of specialists and scientific schools of the department
Abstract
The beginning of training of specialists in the compressor direction at the Moscow State Technical University. N.E. Bauman refers to 1939, when the department "Compressor machines" was created. The head of the department was Professor A.N. Vedernikov, who defended his doctoral dissertation on the theory and calculation of centrifugal compressors. The teachers of the department at that time were V.P. Barmin (later Academician of the Academy of Sciences of the USSR), who prepared and read the course of lectures "Piston compressors"; K.S. Butkevich, who read the course of lectures "Piston expanders". Professor A.N. Vedernikov read a course of lectures "Centrifugal compressors". Great Patriotic War 1941-1945 interrupted the academic work of the department.
8-10
Improving the efficiency of refrigeration with pump circulation of antifreezes.
Abstract
The advantages of use of an antifreeze as a cooling medium in air conditioning systems are shown. The sequence of design steps of the pump installation for antifreeze circulation is presented. Four versions of pump installations for antifreeze circulation are compared. It is shown that in case of proportional control of the head of pumps a decrease in energy consumption up to 49 % from that in the uncontrolled pump installation is possible.
13-14
Air coolers supplied by ZAO Electrostar
Abstract
The efficiency of the refrigeration machine, the reliability and efficiency of the system for defrosting the air cooler from frost, the degree of shrinkage of the product in the refrigeration chamber, largely depend on the design of the air cooler and the area of its heat exchange surface.
20-21
Technological aspects of the use of low-temperature equipment
Abstract
Among the whole variety of refrigeration equipment manufactured by TECHNOBLOCK, Italy (16 series and more than 600 models in mono- and library versions), a special place is occupied by the IBC series. The advantages of this series are the ability to operate the compressor at R22 evaporating temperatures down to -50 °C. This mode of operation can only be achieved by a reciprocating compressor with two-stage compression. High technical and technological requirements are imposed on equipment of this class, and the need for its use is due to a complex indicator that includes economic, technical and technological characteristics.
22-23
Ammonia leak detectors from refrigeration units
Abstract
International agreements to limit emissions of ozone-depleting gases into the atmosphere require the transfer of refrigeration equipment to environmentally friendly refrigerants. Preference is given to natural substances, among which the leading place is occupied by ammonia (R717), which has a number of advantages compared to other refrigerants.
26-27
Water cooling plants
Abstract
Among the entire range of technological equipment offered on the Russian market by Aircool, a special place is occupied by installations for cooling liquids and liquid media. Aircool LLC specialists have developed a new range of water-cooling units with maximum factory readiness and assembled in-house.
28-28