Determination of the compressor optimal working conditions

Aprea, Ciro; Mastrullo, R.; Renno, Carlo

doi:10.1016/j.applthermaleng.2008.10.002

Cited by 39 publications

(14 citation statements)

References 8 publications

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“…At the chiller system with a variable speed compressor, EEV is one of the most important equipment because of the fact that performance improvement from the VSRS depends on the EEV as well [8][9][10]. It regulates refrigerant, enters to the evaporator, and tries to regulate preset temperature, called superheat, between evaporator inlet and outlet.…”

Section: Fuzzy Logic Algorithm For the Eev Controlmentioning

confidence: 99%

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Energy saving potential of chiller system with fuzzy logic control

Ekren

Küçüka

2009

Int. J. Energy Res.

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SUMMARYIn this study, control algorithm, based on fuzzy logic, for compressor speed and opening percentage of electronic expansion valve (EEV), was investigated. The main aim of this study is to increase efficiency of the chiller system, having variable speed scroll compressor (VSSC) and EEV. Current chiller system has an air cooled condenser, a shelltube liquid evaporator, and a vertical scroll compressor. Flow of the refrigerant R134a was controlled by EEV in the system. Chiller systems are designed for working at maximum load conditions; on the contrary, these plants work under partial load conditions most of their life cycle by means of thermostatic control. Refrigeration capacity modulation methods, such as variable speed compressors, allow to match continuously the compressor refrigeration capacity to the load, determining an energy saving according to classical thermostatic control. In this study, compressor speed was controlled with fuzzy logic algorithm according to chiller water output temperature and EEV opening percentage was controlled with fuzzy logic algorithm according to refrigerant superheat value at outlet of the evaporator. Compressor speed has been changed between 30 and 60 Hz and EEV opening percentage has been changed between 10 and 45% of the maximum opening percentage. In fact, the chiller plant was operated as on/off at 50 Hz fixed speed by a thermostat. During the study, it has been operated as variable speed by adding PWM inverter. In the present study, fuzzy logic controlled variable speed chiller system exhibited 17% coefficient of performance increase according to the thermostatic controlled fixed speed system. Also, better water temperature control was obtained via fuzzy controlled VSSC.

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Section: Fuzzy Logic Algorithm For the Eev Controlmentioning

confidence: 99%

“…It is not generally advisable, working frequency values under 30 Hz, because the compressor vibrations and the lubrication troubles due to the splash system. Therefore, optimal control algorithm and compressor speed is required for highest energy savings [7,8].…”

Section: Fuzzy Logic Algorithm For the Compressor Speed Controlmentioning

confidence: 99%

Energy saving potential of chiller system with fuzzy logic control

Ekren

Küçüka

2009

Int. J. Energy Res.

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“…The discharge time t d can then be obtained by combining Equations (10) and (15). The pressure before the discharge time can be calculated using Equation (16) through substituting Equation (10) into Equation (14):…”

Section: Load Calculation and The Selection Of The Ball Screw Pairmentioning

confidence: 99%

“…The control strategy has been investigated by researchers for the operation optimization of the reciprocating compressor. Aprea et al [16] identified the optimal current efficiency for both the reciprocating and scroll compressor for the variable speed compressors in order to obtain the control algorithm for the optimization of the variable speed compressor in terms of energy, exergy, and economy aspects. The stepless capacity control system has been studied for the reciprocating compressors by several scholars [17][18][19][20].…”

Section: Introductionmentioning

confidence: 99%

Development and Experimental Investigation of a Multistage Oxygen Compressor Unit with a Non-Crank Mechanism for the Onboard Oxygen Generating System

et al. 2019

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The oxygen compressor is one of the key components in the onboard oxygen generating system (OBOGS), with a high-pressure canister for backup. In this paper, a multistage compressor unit with a non-crank mechanism is proposed for the compression of the generated oxygen for storage in the high-pressure canister in the oxygen backup line of the OBOGS. The working principle, control strategy, and the design method of the key components of the non-crank compressor are provided to realize the preliminary design. The experimental study was carried out to investigate the control accuracy and the technical feasibility, including the compression capacity and the cooling performance. Results show that the motion control program could realize the motion scheme of the compressor with an error of less than 2%. The discharge pressure reached a relative stability after around 40 cycles of compression, while the discharge temperature achieved relative stability after approximately 100 cycles. The average discharge pressure at the last stage could meet the pressure requirement under standard working conditions. The average inlet temperature of the oxygen to the gasholder was 25 • C under standard working conditions.

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“…The rotational speed control of the scroll compressor used in a cooling loop has been tested experimentally by Aprea et al (2006Aprea et al ( , 2008. It was noticed that by varying the rotational speed of the compressor to match the cooling load required, the consumption of electricity was decreased compared to the energy consumption of the oneoff controlled compressor.…”

Section: Introductionmentioning

confidence: 99%