Download e-book for kindle: Cool thermodynamics : the engineering and physics of by Jeffrey M. Gordon

By Jeffrey M. Gordon

ISBN-10: 142372108X

ISBN-13: 9781423721086

ISBN-10: 1898326908

ISBN-13: 9781898326908

This booklet is aimed at these drawn to the engineering and physics of airconditioning and refrigeration units (chillers). Analytic thermodynamic types are constructed for a large choice of cooling structures and a extensive diversity of working stipulations. those types are simply applied within the box or laboratory. even though the authors concentration upon mechanical (electrically-driven) chillers - basically reciprocating and centrifugal machines - there's additionally giant fabric on heat-driven absorption chillers. warmth pumps and warmth transformers also are addressed. a couple of much less universal chiller forms also are taken care of, corresponding to thermoelectric, thermoacoustic and vortex-tube devices. the cloth is gifted in a way which can entice either the engineer and the physicist, and will shape a bridge among the 2 groups of their research and presentation of cooling structures. In each one bankruptcy, the authors attempt to catch the fundamental physics of the matter, and to emerge with quantitatively exact predictive and diagnostic instruments. they target for easy thermodynamic types the place the sensible dependences of chiller functionality at the significant working variables are obvious. And all of the versions awarded are required to face the try of comparability opposed to experimental functionality information. The reader is proven how chillers should be seen as input-output units, considered from the skin and probed with in simple terms externally-measurable parameters resembling energy enter, cooling expense and coolant temperatures. measurable parameters corresponding to strength enter, cooling price and coolant temperatures. the kind of details wanted via chiller brands and builders in designing and assembling new designs is alsoprovided. How will a given amendment in a chiller part impact potency and cooling cost? what's the mixture of working stipulations of the person elements that maximizes chiller potency at a required cooling cost? some of the chapters can function an industry-oriented path adapted to cooling engineers. The e-book may also represent a part of a college path on cooling structures. Sections of the booklet might be incorporated in introductory and complicated thermodynamics classes. either engineering-oriented and physics-oriented issues are lined in many of the chapters. greater than a dozen instructional examples are included.

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Extra info for Cool thermodynamics : the engineering and physics of predictive, diagnostic and optimization methods for cooling systems

Example text

18), rather than the two heat reservoirs (evaporator and condenser) of vaporcycle mechanical chillers. Third, the absorber is a distinct essential extra component. Fourth, when the total heat rejection is treated as constrained, one has an extra control variable in the division of the heat rejection between the absorber and condenser. And fifth, there is significant internal dissipation (entropy production) from the mass-transfer processes inherent to the absorption cycle and from regenerative heat exchangers when they are introduced.

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.

The dephlegmator heat exchanger then contributes to heat rejection (in addition to the condenser and absorber). C3. COP for absorption machines The COP is defined as the useful effect for a given power input. 11) COPheat transformer = heat rejection at the absorber . 12) There are 5 primary ways in which absorption chillers differ thermodynamically from their mechanical counterparts. First, the driving force is heat rather than work. 18), rather than the two heat reservoirs (evaporator and condenser) of vaporcycle mechanical chillers.

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Cool thermodynamics : the engineering and physics of predictive, diagnostic and optimization methods for cooling systems by Jeffrey M. Gordon

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