Reciprocating compressors defined

Rotary compressors are also PDC types, but where refrigerant flow rotates during compression. Unhke the reciprocating type, rotaiy compressors have a built-in volume ratio which is defined as volume in cavity when the suc tion port is closed (V = m vj over the volume in the cavity when the discharge port is uncovered (V = m vj). Built-in volume ratio determines for a given refrigerant and conditions the pressure ratio which is ... 

As it is known in real compressors, the percent of volume in the total displacement of a piston into a cylinder is called the dead space ratio, and it is defined as c = (volume of dead space) /(volume of displacement) [29]. In the Curzon-Ahlborn cycle, rc appears as the reciprocal of c. It is found that 3%rc>100/10 or 33>rc>10. Supposing power plants working as a Curzon-Ahlborn cycle, a linear approximation of efficiency, Equations (24) and (25), values of efficiency appear around the experimental values. As an example, Table 1 shows a comparison between real values and linear approximation values, y = 1.67, and the closeness of the linear approximation, in case of some modern power plants. 

In real compressors, named alternative compressors with dead space, percent of volume in the total displacement of a piston into a cylinder is named dead space ratio, defined as c = volume of dead space) / (volume of displacement), (Burghardt, 1982). In case of a Curzon and Ahlborn cycle c = (minimum volume) / (maximum volume) is the reciprocal of. Experimentally it is found that 3%r< >100/10, or 33>r(->10. Compression ratio is a useful parameter to model the behavior of a thermal engines, but it is not easy to include this parameter in design of power plants, would be interesting find a model in which could be explicitly incorporated in design power plants. 

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