Coefficient of performance

The Carnot cycle is formulated directly from the second law of thermodynamics. It is a perfectly reversible, adiabatic cycle consisting of two constant entropy processes and two constant temperature processes. It defines the ultimate efficiency for any process operating between two temperatures. The coefficient of performance (COP) of the reverse Carnot cycle (refrigerator) is expressed as... [Pg.352]

In some appHcations, large quantities of waste or low cost heat are generated. The absorption cycle can be directly powered from such heat. It employs two intermediate heat sinks. Its theoretical coefficient of performance is described by... [Pg.352]

The measure of the system performance is coefficient of performance (COP). For refrigeration applications COP is the ratio of heat removed from the low-temperature level (( Uv) lo the energy input (W) ... [Pg.1106]

Coefficient of performance of the absorption cycle is defined on the same principle as for the mechanical refrigeration ... [Pg.1119]

Principles The performance of a real refrigerator is measured by the coefficient of performance, COP, defined as... [Pg.1128]

P = power generated by the turbine (windmill) in watts Cp = coefficient of performance which depends upon the aerodynamic efficiency of the rotor and varies with the number of blades and their profile. This factor is provided by the mill supplier and generally varies between 0.35 and 0.45 A = swept area of the rotor in... [Pg.158]

P = power generated by the windmill in watts Cp = coefficient of performance A = swept area of the rotor in m ... [Pg.163]

COP, Coefficient of Performance, is equal ro cooling power per needed electric power... [Pg.1379]

Work is invested to force heat to flow from the interior of the refrigerator. A measure of the performance, called coefficient of performance (COP), is... [Pg.284]

Coefficient of Performance. COP is the ratio of refrigerating effect to work of compression. The higher the value of COP, the higher the efficiency of the cycle. Referring to Figure 11-48A,... [Pg.351]

Since the vapour compression cycle uses energy to move energy, the ratio of these two quantities can be used directly as a measure of the performance of the system. This ratio, the coefficient of performance, was first expressed by Sadi Carnot in 1824 for an... [Pg.15]

Transfer of heat through the walls of the evaporator and condenser requires a temperature difference. This is shown on the modified reversed Carnot cycle (Figure 2.5). For temperature differences of 5 K on hoth the evaporator and condenser, the fluid operating temperatures would he 263.15 K and 313.15 K, and the coefficient of performance falls to 5.26. [Pg.17]

Solar radiation can also be used.) The overall energy used is greater than with the compression cycle, so the COP (coefficient of performance) is lower. Typical figures are as shown in Table 2.2. [Pg.26]

Condensing temperature rc) Coefficient of performance Weekly electricity costs ( , 5 p/unit)... [Pg.113]

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