By American Society of Heating Refrigerating and Air-Conditioning Engineers
This guide covers the refrigeration apparatus and structures for functions except human convenience. This e-book comprises info on cooling, freezing, and storing foodstuff; commercial purposes of refrigeration; and low-temperature refrigeration. essentially a reference for the working towards engineer, this quantity is usually important for an individual excited about cooling and garage of nutrition items. This version contains new chapters. bankruptcy three, Carbon Dioxide Refrigeration structures, describes the historical past of this "natural refrigerant" and why it's the topic of renewed curiosity this present day. The bankruptcy includes dialogue and diagrams on CO2 refrigerant purposes, process layout, apparatus, safeguard, lubricants, commissioning, operation, and upkeep. bankruptcy 50, Terminology of Refrigeration, lists many of the universal phrases utilized in business refrigeration structures, quite structures utilizing ammonia because the refrigerant.
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Extra resources for 2010 ASHRAE Handbook - Refrigeration (SI Edition)
H. 1964. Liquid recirculation systems-What rate of feed is recommended. TheAir Conditioning& RefrigerationBusiness(December). R. 1961. Check these points when designing knockout drums. Hydmcarbon Pmcesing and perroleurn Refiner(June). D. 1963. Size vapor-liquid separators quicker by nomograph. Hydmcarbon Pmcessing and Perroleurn Refiner(October). D. 1964. Horizontal vapor-liquid separators. Hydmcarbon Pmcessing and petroleum Refiner(May). B. 1963. Discharge temperature considerations with multicylinder ammonia compressors.
6 are used, entering liquid pressure should be high enough to cause flow into the evaporator. Multicircuit systems must have a bypass relief valve in the pump discharge. The relief valve’s pressure should be set considering the back pressure on the valve from the low-pressure receiver. For example, if the low-pressure receiver is set at 300 kPa and the maximum discharge pressure from the pump is 900 kPa, the relief valve should be set at 600 kPa. When some circuits are closed, excess liquid is bypassed into the low-pressure receiver rather than forced through the evaporators still in operation.
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. At subatmospheric pressures, high-pressure vapor must be piped into the oil pot to force oil out. Because of oil’s low solubility in liquid ammonia, thick oil globules circulate with the liquid and can restrict flow through strainers, orifices, and regulators. To maintain high efficiency, oil should be removed from the system by regular draining.