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Sensors and Materials
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Sensors and Materials, Volume 30, Number 11(2) (2018)
Copyright(C) MYU K.K. All Rights Reserved.
pp. 2599-2614
S&M1702 Research Paper of Special Issue
https://doi.org/10.18494/SAM.2018.2070
Published: November 20, 2018

Intelligent High-performance Dynamic Control for Two-stage Screw High-temperature Heat Pump System [PDF]

Win-Jet Luo, Jin-Chang Lai, Po-Yuan Hsieh, and Fikri Rahmat Fasya

(Received March 28, 2018; Accepted September 12, 2018)

Keywords: heat pump, flash tank, heat recovery, suitable vapor injection pressure, performance enhancement

In this study, we developed a new type of water-to-water two-stage screw heat pump with a vapor injection flash tank and investigated the performance of the heat pump under various condensation temperatures of the refrigeration cycle. In addition to the flash tank, a flooded-type evaporator and a shell-tube oil cooler for refrigeration oil heat recovery are implemented in the heat pump system. Suitable vapor injection pressures corresponding to different condensation temperatures were found. It was also found in this study, that with a suitable vapor injection pressure for operation, the average coefficient of heating performance can be enhanced by the investigated heat pump system under various condensation temperatures. An intelligent controlling strategy in terms of the subcooled degree was developed to attain the dynamic high performance of the heat pump under different condensation temperatures. From the performance measurements, it can be found that the average heating capacity improvement of 29% and the performance enhancement of 11% can be achieved by the two-stage water-to-water heat pump by utilizing the controlling strategy to adjust the vapor injection and the oil heat recovery under different condensation temperatures.

Corresponding author: Win-Jet Luo


Cite this article
Win-Jet Luo, Jin-Chang Lai, Po-Yuan Hsieh, and Fikri Rahmat Fasya, Intelligent High-performance Dynamic Control for Two-stage Screw High-temperature Heat Pump System, Sens. Mater., Vol. 30, No. 11, 2018, p. 2599-2614.



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