Download 2010 ASHRAE Handbook - Refrigeration (SI Edition) by American Society of Heating Refrigerating and PDF

By American Society of Heating Refrigerating and Air-Conditioning Engineers

This instruction manual covers the refrigeration gear and platforms for purposes except human convenience. This publication contains info on cooling, freezing, and storing foodstuff; business purposes of refrigeration; and low-temperature refrigeration. basically a reference for the training engineer, this quantity is usually worthy for someone excited about cooling and garage of nutrition items. This version comprises new chapters. bankruptcy three, Carbon Dioxide Refrigeration platforms, describes the heritage 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, apparatus, safeguard, lubricants, commissioning, operation, and upkeep. bankruptcy 50, Terminology of Refrigeration, lists a number of the universal phrases utilized in commercial refrigeration structures, fairly platforms utilizing ammonia because the refrigerant.

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

Example text

Pressure drop through flow control regulators is usually 10 to 50% of the available feed pressure. Pressure at the outlet of the flow regulators must be higher than the vapor pressure at the lowpressure receiver by an amount equal to the total pressure drop of the two-phase mixture through the evaporator, any evaporator pressure regulator, and wet return lines. Pressure loss could be 35 kPa in a typical system. When using recommended liquid feed sizing practices, assuming a single-story building, the frictional pressure drop from pump discharge to evaporators is about 70 kPa.

2 Pump Circulation, Horizontal Separator refrigerant. It should have a free area twice the transverse crosssectional area of the line in which it is installed. With ammonia, consider using a suction strainer. Open-drive pumps do not require strainers. If no strainer is used, a dirt leg should be used to reduce the risk of solids getting into the pump. Generally, minimum pump pressure should be at least double the net positive suction pressure to avoid cavitation. 9 m/s. Net positive suction pressure and flow requirements vary with pump type and design; consult the pump manufacturer for specific requirements.

OVERFEED SYSTEM OPERATION Mechanical Pump Figure 1 shows a simplified pumped overfeed system in which a constant liquid level is maintained in a low-pressure receiver. A mechanical pump circulates liquid through the evaporator(s). The two-phase return mixture is separated in the low-pressure receiver. Vapor is directed to the compressor(s). Makeup refrigerant enters the low-pressure receiver by means of a refrigerant metering device. Figure 2 shows a horizontal low-pressure receiver with a minimum pump pressure, two service valves in place, and a strainer on the suction side of the pump.

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