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Rapport 2414173 - October 2007 __________________________________________________________________ 4. COMPONENTS FOR R744 HEAT PUMPS Components for R744 systems have to withstand much higher pressures than their HFC and HCFC counterparts. Pressure differentials are higher by one order of magnitude. Other issues are introduced by the particularity of R744, e.g. high discharge temperatures, compatibility with lubricating oils, potential degradation of seals after decompression, etc. These issues hinder the fast development of a "component chain". In Japan, the mostly available components for transcritical cycles are those used in the Ecocute systems, viz. air coils (evaporators), compressors, electronic expansion valves (EEVs) and water-to-R744 heat exchangers ("gas coolers"). In Europe, few manufacturers have an offer for R744 components, except Danfoss, which mainly markets compressors, and valves. In this section, we will examine the marketed items (or to-be-marketed as claimed by component manufacturers), and describe their respective technologies. 4.1.Compressors Bock markets semi-hermetic, electrical driven compressors for transcritical R744 cycles aiming at industrial and commercial refrigeration or air-conditioning applications. The two-cylinder fixed-displacement compressors have an integrated gas cooled electric motor 4- pole version (1,500 rpm), with swept volumes ranging from 90 to 190 cc (which yields displacement volumes from 7.70 m!/h to 20 m!/h). The HGX2 and HAX2 compressor series can handle variable rotational speed, with a maximal 1800 rpm. They are equipped with HP and LP safety valves and use synthetic oil. Their overall weight is about 160 kg. Figure 21 : Bock Series HGX2 Figure 22 : Bock Series RKX26/31 __________________________________________________________________________________________ SHERPHA PROJECT - Transcritical R744 Heat Pumps – Technician's Manual 25/62PDF Image | NATURAL REFRIGERANTS
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