By American Society of Heating Refrigerating and Air-Conditioning Engineers
This instruction manual covers the refrigeration apparatus and platforms for functions except human convenience. This booklet contains info on cooling, freezing, and storing nutrients; business functions of refrigeration; and low-temperature refrigeration. essentially a reference for the working towards engineer, this quantity can also be valuable for someone fascinated by cooling and garage of nutrients 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 have been revised for extra logical circulate and use.
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Extra info for 2010 ASHRAE Handbook - Refrigeration (I-P Edition)
However, the pressure/temperature characteristic of CO2 offers the possibility to increase the mass flux in the evaporator to achieve higher rates of heat transfer without suffering from excessive saturated temperature drop. ) and aluminum fins, increase heat transfer performance in industrial and commercial applications.
If a single riser is sized for minimum pressure drop at full load, the static pressure penalty is excessive at part load, and lubricant return Fig. 47 Recirculated Liquid Return System could be a problem. If the single riser is sized for minimum load, then riser pressure drop is excessive and counterproductive. Double risers solve these problems (Miller 1979). Figure 48 shows that, when maximum load occurs, both risers return vapor and liquid to the wet suction. At minimum load, the large riser is sealed by liquid ammonia in the large trap, and refrigerant vapor flows through the small riser.
The point of equilibrium where all three states coexist that is known as the triple point. The second important pressure and temperature point of recognition is the critical point where liquid and vapor change state. 8°F; this is considered to be low compared to all commonly used refrigerants. Fig. 1 CO2 Expansion-Phase Changes (Adapted from Vestergaard and Robinson 2003) LIVE GRAPH Click here to view Fig. 2 CO2 Phase Diagram Fig. 2 CO2 Phase Diagram (Adapted from Vestergaard and Robinson 2003) APPLICATIONS Transcritical CO2 Refrigeration In a transcritical refrigeration cycle, CO2 is the sole refrigerant.