Port Optimization of a Voorhees Modified CO2 Compressor Using Indicator Diagram Analysis
نویسندگان
چکیده
The economizer principle is a well-known method to reduce the expansion losses of a refrigeration system. The alternative refrigerant CO2 has a relatively large isentropic exponent. Therefore it has a high potential for raising efficiency by application of this principle. Reciprocating piston compressors are favored for CO2 refrigeration applications due to their small sealing length and therefore low internal leakage rate. The economizer principle can be applied to reciprocating compressors by use of the “multiple effect” principle patented by Voorhees in 1905. This paper investigates the influence of the admission port design on the admission process. The admission port is one of the main compressor modifications to realize the “multiple effect” principle. Its design has a large impact on the system efficiency and therefore needs to be optimized. For this purpose, an optimization process has been established. It is based on indicator diagram analysis. To exemplify, the measurements of three admission ports were compared at constant suction pressure (1.2 MPa) and varying admission pressure (1,4 MPa – 2,6 MPa).
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