By American Society of Heating Refrigerating and Air-Conditioning Engineers
This guide covers the refrigeration gear and platforms for purposes except human convenience. This e-book contains info on cooling, freezing, and storing meals; business functions of refrigeration; and low-temperature refrigeration. basically a reference for the practising engineer, this quantity is additionally valuable for somebody all in favour of cooling and garage of meals items. This version contains new chapters. bankruptcy three, Carbon Dioxide Refrigeration platforms, describes the historical past of this "natural refrigerant" and why it's the topic of renewed curiosity this day. The bankruptcy comprises dialogue and diagrams on CO2 refrigerant purposes, procedure layout, apparatus, safeguard, lubricants, commissioning, operation, and upkeep. bankruptcy 50, Terminology of Refrigeration, lists the various universal phrases utilized in business refrigeration structures, relatively structures utilizing ammonia because the refrigerant.
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Additional resources for 2010 ASHRAE Handbook - Refrigeration (SI Edition)
5 mm diameter orifice to avoid clogging. OIL IN SYSTEM Despite reasonably efficient compressor discharge oil separators, oil finds its way into the system low-pressure sides. In ammonia overfeed systems, most of this oil can be drained from low-pressure receivers with suitable oil drainage facilities. In low-temperature systems, a separate valved and pressure-protected, noninsulated oil drain pot can be placed in a warm space at the accumulator (Figure 6). The oil/ammonia mixture flows into the pot, and the refrigerant evaporates.
B. 1976. Two-phase pressure drop in refrigerant liquid overfeed systems-Design tables. ASHRAE Transactions82(2): 107-133. , H. Lau, and E. Skuchas. 1976. Two-phase pressure drop in refrigerant liquid overfeed systems-Experimental measurements. ASHRAE Transactions82(2): 134-150. W. 1967. Pump overfeed evaporator refrigeration systems. Air Conditioning, Heating& RefrigerationNews(January 30, February 6, March 6, March 13, March 20, March 27). Lorentzen, G. O. Baglo. 1969. An investigation o f a gas pump recirculation system.
Alternative ways to design wet returns include the following: Use one pipe size larger than calculated for vapor flow alone. Use a velocity selected for dry expansion reduced by the factor J1 /Circulating Rate. 5, or half that of the acceptable dry-vapor velocity. Use the design method described by Chaddock et al. ( 1 972). 036 K drop per metre of horizontal lines for R-7 17 (ammonia), R-12, R-22, and R-502. When sizing refrigerant lines, the following design precautions should be taken: Carefully size overfeed return lines with vertical risers because more liquid is held in risers than in horizontal pipe.
2010 ASHRAE Handbook - Refrigeration (SI Edition) by American Society of Heating Refrigerating and Air-Conditioning Engineers