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

By American Society of Heating Refrigerating and Air-Conditioning Engineers

This guide covers the refrigeration gear and structures for purposes except human convenience. This e-book contains details on cooling, freezing, and storing nutrition; business functions of refrigeration; and low-temperature refrigeration. essentially a reference for the practising engineer, this quantity can also be valuable for an individual interested by cooling and garage of foodstuff items. This variation contains new chapters: Carbon Dioxide Refrigeration platforms and Terminology of Refrigeration. additionally new for this quantity are bankruptcy order and groupings which were revised for extra logical move and use.

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Extra resources for 2010 ASHRAE Handbook - Refrigeration (I-P Edition)

Example text

IIAR. 1998. Minimum safety criteria for a safe ammonia refrigeration system. Bulletin 109. International Institute of Ammonia Refrigeration, Arlington, VA. IIAR. 1999. Equipment, design, and installation of ammonia mechanical refrigeration systems. ANSI/IIAR Standard 2-1999. International Institute of Ammonia Refrigeration, Arlington, VA. Loyko, L. 1992. Condensation induced hydraulic shock. IIAR Technical Paper. International Institute of Ammonia Refrigeration, Arlington, VA. , R. Brown, J. Brown, L.

26 2010 ASHRAE Handbook—Refrigeration Fig. 46 Soft Hot-Gas Defrost Cycle Fig. 46 Soft Hot-Gas Defrost Cycle (For coils with 15 tons refrigeration capacity or above) the last three features listed in the section on Demand Defrost apply to soft hot-gas defrost. Fig. 47 Recirculated Liquid Return System Double Riser Designs for Large Evaporator Coils Static pressure penalty is the pressure/temperature loss associated with a refrigerant vapor stream bubbling through a liquid bath. If speed in the riser is high enough, it will carry over a certain amount of liquid, thus reducing the penalty.

Also, the two refrigerants are not compatible with each other, and cross-contamination results in blockage in the ammonia circuit and may put the system out of commission for an extended period. The cascade heat exchanger design must prevent internal leakage that can lead to the two refrigerants reacting together. Figure 8 shows a simplified ammonia cascade system; note that no oil return is shown. System Design Pressures The system design pressure for a CO2 cascade system cannot be determined in the traditional way, because the design temperatures are typically above the critical point.

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