2006 ASHRAE Handbook - Refrigeration (I-P Edition)

This guide covers the refrigeration gear and structures for functions except human convenience. This booklet contains info on cooling, freezing, and storing nutrients; commercial functions of refrigeration; and coffee temperature refrigeration and has been up to date to incorporate forty seven Interactive Tables and 152 Digitized Graphs. essentially a reference for the working towards engineer, this quantity is usually necessary for somebody interested by the cooling and garage of nutrients items. The publication is split into 9 separate sections:

  • Refrigeration method Practices
  • Food garage and kit
  • Food Refrigeration
  • Distribution of Chilled and Frozen nutrients
  • Industrial purposes
  • Low-Temperature purposes
  • Refrigeration apparatus
  • Unitary Refrigeration apparatus
  • General

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Extra resources for 2006 ASHRAE Handbook - Refrigeration (I-P Edition)

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5 should be used as guides for safe practice because they are the basis of most municipal and state codes. However, some ordinances require heavier piping and other features. The designer should know the specific requirements of the installation site. Only A106 Grade A or B or A53 Grade A or B should be considered for steel refrigerant piping. The designer should know that the rated internal working pressure for Type L copper tubing decreases with (1) increasing metal operating temperature, (2) increasing tubing size (OD), and (3) increasing temperature of joining method.

Then, the crankcase pressure would not rise high enough to reach the cut-in point, and effective automatic pumpdown would not be obtained. Crankcase Oil Heater (Direct-Expansion Systems) A crankcase oil heater with or without single (nonrecycling) pumpout at the end of each operating cycle does not keep liquid refrigerant out of the crankcase as effectively as automatic pumpdown control, but many compressors equalize too quickly after stopping automatic pumpdown control. Crankcase oil heaters maintain the crankcase oil at a temperature higher than that of other parts of the system, minimizing the absorption of the refrigerant by the oil.

In multiple-fan air-cooled condensers, it is common to cycle fans off down to one fan and then to apply air throttling to that section or modulate the fan motor speed. Consult the manufacturer before using this method, because not all condensers are properly circuited for it. Using ambient temperature change (rather than condensing pressure) to modulate air-cooled condenser capacity prevents rapid cycling of condenser capacity. A disadvantage of this method is that the condensing pressure is not closely controlled.

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