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2010 ASHRAE Handbook - Refrigeration (SI Edition) - download pdf or read online

By American Society of Heating Refrigerating and Air-Conditioning Engineers

This instruction manual covers the refrigeration apparatus and structures for purposes except human convenience. This publication contains details on cooling, freezing, and storing nutrition; business functions of refrigeration; and low-temperature refrigeration. essentially a reference for the working towards engineer, this quantity is additionally necessary for an individual thinking about cooling and garage of nutrients items. This variation comprises new chapters. bankruptcy three, Carbon Dioxide Refrigeration structures, describes the background 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 functions, process layout, gear, defense, lubricants, commissioning, operation, and upkeep. bankruptcy 50, Terminology of Refrigeration, lists a few of the universal phrases utilized in commercial refrigeration platforms, fairly platforms utilizing ammonia because the refrigerant.

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Extra info for 2010 ASHRAE Handbook - Refrigeration (SI Edition)

Sample text

A refrigerant is a fluid used for heat transfer in a refrigeration system. The fluid absorbs heat at a low temperature and pressure and transfers heat at a higher temperature and pressure. Heat transfer can involve either a complete or partial change of state in the case of a primary refrigerant. Energy transfer is a function of the heat transfer coefficients; temperature differences; and amount, type, and configuration of the heat transfer surface and, hence, the heat flux on either side of the heat transfer device.

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. Except at low temperatures, halocarbons are miscible with oil. Therefore, positive oil return to the compressor must be ensured.

This applies in particular to air, water, or electric defrost units. Any liquid remaining in the coils rapidly evaporates or drains to the low-pressure receiver. Defrost is faster than in bottomfeed evaporators. REFRIGERANT CHARGE Overfeed systems need more refrigerant than dry expansion systems. Top-feed arrangements have smaller charges than bottomfeed systems. The amount of charge depends on evaporator volume, circulating rate, sizes of flow and return lines, operating temperature differences, and heat transfer coefficients.

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