Cool Thermodynamics: Engineering and Physics of Predictive, by Jeffrey M. Gordon

By Jeffrey M. Gordon

The booklet is geared in the direction of these attracted to the engineering and physics of air-conditioning and refrigeration units (chillers). Analytic thermodynamic versions are built for a large number of cooling structures and a extensive variety of working stipulations. The e-book can also be appropriate as a part of a college path on cooling platforms.

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Extra info for Cool Thermodynamics: Engineering and Physics of Predictive, Diagnostic and Optimization Methods for Cooling Systems

Sample text

7. The four key steps are: (1) throttling in an expansion device (a–b) during which the refrigerant temperature falls below the temperature of the space to be cooled; (2) isobaric isothermal heat removal in the evaporator (b–c), with the refrigerant entering the evaporator as a low-quality saturated mixture and completely evaporates due to accepting heat from the refrigerated space; (3) isentropic compression (c–d) where saturated vapor is brought up to the condenser pressure and well above the temperature of the surrounding medium; and (4) isobaric heat rejection to the environment at the condenser (d–d'–a) of which branch d'–a is isothermal, with the refrigerant entering as superheated vapor and leaving as saturated liquid.

0 7. 0 8. 71 18 8 . 0 state point determine: (1) the ratio of solution mass flow rate at the absorber to refrigerant mass flow rate, commonly called the circulation flow rate ratio CR; (2) the chiller’s COP; and (3) the mass flow rate of saturated steam that must be supplied to the generator. Solution: We begin by considering the mass balance for the refrigerant flows into and out of the generator (at steady state): (mass flow rate of refrigerant entering from the concentrated solution) – (mass flow rate of refrigerant leaving via the dilute solution) = (mass flow rate of refrigerant leaving as vapor from the generator) .

ABSORPTION CHILLERS C1. 18). The difference lies in how the low-pressure vapor that exits the evaporator is converted into the high-pressure vapor that enters the condenser. Instead of the work-driven compressor of a mechanical chiller, thermal power is the driving force. The heat is usually delivered in the form of hot water or steam, and is commonly derived from the combustion of natural gas, industrial waste heat, geothermal sources, or solar energy collection. A vapor-compression chiller produces its cooling at an evaporator (a heat pump produces its heating at a condenser).

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