2006 ASHRAE Handbook - Refrigeration (I-P Edition)

This guide covers the refrigeration gear and structures for functions except human convenience. This e-book comprises details on cooling, freezing, and storing nutrients; business purposes 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 practising engineer, this quantity can be priceless for someone enthusiastic about the cooling and garage of foodstuff items. The ebook is split into 9 separate sections:

  • Refrigeration approach Practices
  • Food garage and gear
  • Food Refrigeration
  • Distribution of Chilled and Frozen nutrition
  • Industrial functions
  • Low-Temperature functions
  • Refrigeration apparatus
  • Unitary Refrigeration gear
  • General

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

Example text

These units are usually installed so that the suction outlet drains the shell. When the units are used to evaporate liquid refrigerant returning in the suction line, the free-draining arrangement is not recommended. Liquid refrigerant can run along the bottom of the heat exchanger shell, having little contact with the warm liquid coil, and drain into the compressor. By installing the heat exchanger at a slight angle to the horizontal (Figure 29) with gas entering at the bottom and leaving at the top, any liquid returning in the line is trapped in the shell and held in contact with the warm liquid coil, where most of it is vaporized.

After a further time delay, a pair of normally closed timing relay contacts opens, deenergizing the bypass valve. Full (100%) Unloading for Capacity Control Where full unloading is required for capacity control, hot-gas bypass arrangements can be used in ways that will not overheat the compressor. In using these arrangements, hot gas should not be bypassed until after the last unloading step. Hot-gas bypass should (1) give acceptable regulation throughout the range of loads, (2) not cause excessive superheating of the suction gas, (3) not cause any refrigerant overfeed to the compressor, and (4) maintain an oil return to the compressor.

When sizing the valve, consult a control valve manufacturer to determine the minimum compressor capacity that must be offset, refrigerant used, condensing pressure, and suction pressure. When unloading (Figure 39C), head pressure control requirements increase considerably because the only heat delivered to the condenser is that caused by the motor power delivered to the compressor. Discharge pressure should be kept high enough that the hot-gas bypass valve can deliver gas at the required rate. The condenser head pressure control must be capable of meeting this condition.

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