2018
DOI: 10.1016/j.applthermaleng.2018.05.118
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Control strategy of compressor and sub-cooler in variable refrigerant flow air conditioning system for high EER and comfortable indoor environment

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Cited by 34 publications
(21 citation statements)
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“…Compressor speed has an impact on refrigerant flow rate in the cycle; consequently, it would affect the refrigeration capacity. EEV is also working as the main part of variable speed refrigeration systems to regulate degree of refrigerant superheat at desired values and to maintain pressure ratio at optimum working levels [10]. System performance under manual operation was examined to determine the effect of compressor speed and valve opening at constant inlet water temperatures to the evaporator and condenser 17 and 29 °C, respectively.…”
Section: Resultsmentioning
confidence: 99%
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“…Compressor speed has an impact on refrigerant flow rate in the cycle; consequently, it would affect the refrigeration capacity. EEV is also working as the main part of variable speed refrigeration systems to regulate degree of refrigerant superheat at desired values and to maintain pressure ratio at optimum working levels [10]. System performance under manual operation was examined to determine the effect of compressor speed and valve opening at constant inlet water temperatures to the evaporator and condenser 17 and 29 °C, respectively.…”
Section: Resultsmentioning
confidence: 99%
“…The experimental results showed that energy saving can be increased by 38.9% using a variable speed driver for both the compressor and fans compared to single speed equipment. Tu et al [10] developed a dynamic model to control a variable refrigerant flow system including variable speed compressor, EEV and sub-cooler. The optimum energy efficiency ratio was at narrow EEV opening under partload condition.…”
Section: Introductionmentioning
confidence: 99%
“…These types of HPs can adjust their heating capacity to the heat load by continuously regulating their compressor speed by means of pulse width modulation (PWM) and pulse amplitude modulation (PAM) via the inverter. Shao [7] showed that the proper modulation of the capacity to the heat demand significantly reduces the power consumption of the HP, thus the compressor operating speed is essentially affecting the performance of the HP [8]. Several studies confirmed the influence of the compressor speed on the capacity and thus control strategies via frequency adjustment of the compressor have been developed [9][10][11][12].…”
Section: Introductionmentioning
confidence: 99%
“…Shao [7] showed that the proper modulation of the capacity to the heat demand significantly reduces the power consumption of the HP; thus the compressor operating speed is essentially affecting the performance of the HP [8]. Several studies confirmed the influence of the compressor speed on the capacity and thus control strategies via frequency adjustment of the compressor have been developed [9][10][11][12].…”
Section: Introductionmentioning
confidence: 99%