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

By Jeffrey M. Gordon

The publication is geared in the direction of these drawn to the engineering and physics of air-conditioning and refrigeration units (chillers). Analytic thermodynamic types are constructed for a large number of cooling structures and a vast variety of working stipulations. The ebook is usually compatible as a part of a school direction on cooling platforms.

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

Example text

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 ammonia– water system is most common when sub-zero refrigerant temperatures are required. The LiBr–water pair enjoys a high enthalpy of evaporation, is nontoxic (as opposed to ammonia) and non-flammable, and has demonstrated a long successful track record in commercial machines.

Refrigerant vapor is compressed and discharged to the condenser (2–3). • De-superheating in the condenser (3–4). • Condensation/heat rejection (4–5–6). • Throttling (expansion) (6–7). • Evaporation/cooling effect/heat removal (7–1). 9: Schematic of a real vapor-compression mechanical chiller. 10: T–S diagram for a real (as opposed to an idealized) vapor-compression cycle. 27 Cool Thermodynamics Mechanochemistry of Materials What should ideally be isothermal branches (4–5 and 7–1) and isentropic branches deviate from the desired limiting behavior due to internal losses such as fluid friction (pressure drops), heat leaks to or from the environment, and the need for single-phase processes at the compressor and throttler.

In distinction, double-stage chillers generate twice, in two separate generators. The higher-pressure refrigerant vapor generated in the first stage is condensed; the heat of condensation is exploited (partly recovered) to generate lower-pressure refrigerant vapor from the solution a second time. The heat recovery or heat regeneration in the double-stage chiller generates almost twice the amount of refrigerant vapor as in the corresponding single-stage unit. Hence one would expect double-stage chillers to exhibit almost twice the COP of single-stage designs.

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