Measurement system design for a two-stage dry screw air compressor and a pre-test uncertainty estimation for the measurement system
Oladejo, Abiola (2020)
Diplomityö
2020
School of Energy Systems, Energiatekniikka
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Julkaisun pysyvä osoite on
https://urn.fi/URN:NBN:fi-fe2020090868929
https://urn.fi/URN:NBN:fi-fe2020090868929
Tiivistelmä
About 10% of industrial electricity usage is attributed to compressed air systems. Dry screw compressors especially have a wide range of applications in many industries. However, many industries using dry screw compressors do not quantify the efficiency and performance of their screw compressors towards enabling energy savings. This thesis thus investigates alternative measurement setups that can be used for conducting a performance test for isentropic efficiency determination in a two-stage dry screw compressor with liquid cooling.
The findings of this thesis showed that isentropic efficiency of a compressor can be deter-mined with and without internal compressor unit measurements. However, measurements inside a compressor unit are needed to properly estimate isentropic efficiency.When internal compressor unit measurements are not done, there are many unknowns and factors ignored; this may dispute the reliability of the efficiency result. Also, the use of flowmeters with long meter runs are not feasible to construct or mount in the industries due to space constraints. Therefore, a setup that uses a Coriolis meter with a suitable configuration was found to be an optimal design. An Excel calculation tool was made which calculated the isentropic efficiency and the uncertainties associated with making the measurements.
The findings of this thesis showed that isentropic efficiency of a compressor can be deter-mined with and without internal compressor unit measurements. However, measurements inside a compressor unit are needed to properly estimate isentropic efficiency.When internal compressor unit measurements are not done, there are many unknowns and factors ignored; this may dispute the reliability of the efficiency result. Also, the use of flowmeters with long meter runs are not feasible to construct or mount in the industries due to space constraints. Therefore, a setup that uses a Coriolis meter with a suitable configuration was found to be an optimal design. An Excel calculation tool was made which calculated the isentropic efficiency and the uncertainties associated with making the measurements.