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