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

By Jeffrey M. Gordon

The e-book is geared in the direction of these attracted to the engineering and physics of air-conditioning and refrigeration units (chillers). Analytic thermodynamic versions are constructed for a large number of cooling structures and a wide diversity of working stipulations. The booklet is additionally appropriate as a part of a college path on cooling structures.

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By Jeffrey M. Gordon

The e-book is geared in the direction of these attracted to the engineering and physics of air-conditioning and refrigeration units (chillers). Analytic thermodynamic versions are constructed for a large number of cooling structures and a wide diversity of working stipulations. The booklet is additionally appropriate as a part of a college path on cooling structures.

Show description

Read Online or Download Cool Thermodynamics: Engineering and Physics of Predictive, Diagnostic and Optimization Methods for Cooling Systems PDF

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

Example text

Namely, the heat transformer delivers its useful effect (at the absorber) at a higher temperature than that of the heat input. C2. Working pairs (refrigerant solutions) and practical considerations The two most widely used absorption systems are: (1) water (refrigerant)–lithium bromide (LiBr); and (2) ammonia (refrigerant)–water. The LiBr–water combination is limited to installations where the minimum refrigerant temperature is above the freezing point of water (0°C). Furthermore, the LiBr–water solution must not be allowed to cool below about 5°C lest it freeze and irreparably damage the unit.

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).

Whereas the vapor pressure curve of ammonia forces ammonia–water absorption chillers to operate at relatively high pressures that may constitute a safety problem, LiBr–water chillers run under partial vacuum. Absorption devices have exhibited long lifetimes and excellent partload behavior. The common working pairs of LiBr–water and ammonia– water are non-ozone-depleting and non-global warming chemicals, in contrast to standard refrigerants in mechanical chillers. The major limitations of absorption machines, relative to their mechanical counterparts, are restricted temperature ranges and relatively high initial costs.

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