• Title/Summary/Keyword: 전자팽창밸브

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Characteristics of Capacity Control of Variable Speed Water Cooler with the Electronic Expansion Valve Open/Close Degree (전자팽창밸브 개도에 따른 가변속 수냉각기의 용량제어 특성)

  • Beak, Seung-Moon;Moon, Choon-Geun;Kim, Hyun-Woo;Jeong, Seok-Kwon;Yoon, Jung-In
    • Journal of Advanced Marine Engineering and Technology
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    • v.34 no.2
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    • pp.282-288
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    • 2010
  • The paper presents the characteristics of capacity control of variable speed water cooler with the electronic expansion valve open/close degree. It is a preliminary study on the optimum control of the water cooler system using a variable speed compressor controlled by inverter. The electronic expansion valve controlled by the variation of compressor speed maintains the constant degree of superheat at the evaporator outlet, which aims to find the degree of superheat obtaining the optimum refrigeration effect. The investigation indicates that there is a point achieving the maximum cooling capacity by the variation of the electronic expansion valve open/close degree with constant compressor speed.

Fuzzy Control Algorithms for the Compressor and the Electronic Expansion Valve of a Multi-type Air-conditioning System using Multiple Input Variables (다입력변수를 사용한 멀티형 공조시스템 압축기와 전자팽창밸브의 퍼지 제어 알고리즘)

  • Han, Do-Young;Park, Kwan-Jun
    • Korean Journal of Air-Conditioning and Refrigeration Engineering
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    • v.18 no.2
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    • pp.163-171
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    • 2006
  • In order to control multi-zone temperatures, a multi-type air-conditioning system may be used. In this study, control algorithms for the compressor and the electronic expansion valve of a multi-type air-conditioning system were developed by using fuzzy logics. The compressor control algorithm was composed of a compressor pressure setpoint algorithm, a compressor pressure setpoint reset algorithm, and a compressor frequency setpoint algorithm. The electronic expansion valve control algorithm was composed of an indoor temperature control algorithm, and a superheat control algorithm. These algorithms were applied to a multi-type air-conditioning system. Test showed good results for the control of a multi-type air-conditioning system.

EEV Superheat Control of a Multi-type Heat Pump by Using Dither Signal (멀티형 히트펌프 전자팽창밸브의 디더 신호를 적용한 과열도 제어)

  • 한도영;표수환
    • Korean Journal of Air-Conditioning and Refrigeration Engineering
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    • v.14 no.11
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    • pp.948-953
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    • 2002
  • The electronic expansion valve (EEV) may be used to control the refrigerant flow rate for the multi-type heat pump. Stepping motor driven EEV may precisely control the refrigerant flow rate to meet each internal load requirement. To control the EEV, PI algorithm may be used. But the hysteresis of EEV deteriorates the performance of superheat control. To reduce the performance degradation, the PI algorithm along with the dither signal may be used. The dither signal, with about 10 times higher frequency than the system crossover frequency and about 10 times larger magnitude than the deadband of hysteresis, was selected for the superheat control of EEV. Experimental results showed the improvement of EEV control by adding the dither signal to the PI algorithm.

Control of Compressor and Electronic Expansion Valve for a Tandom-type Air-conditioner (텐덤형 냉방시스템의 압축기와 전자팽창밸브 제어)

  • Jung, Nam-Chul;Han, Do-Young
    • Proceedings of the SAREK Conference
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    • 2005.11a
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    • pp.469-473
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    • 2005
  • Capacities of a tandom-type air-conditioner may be modulated by turning on/off multiple compressors and adjusting positions of a electronic expansion valve. In this study. control algorithms for compressors and a electronic expansion valve were developed by using fuzzy’ logics. There algorithms were implemented in a test lab and proved to be effective for the control of indoor air temperature and superheat temperature.

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The EEV Control of the Multi-type Air-conditioning System by using a Fuzzy Logic Superheat Temperature Setpoint Reset Algorithm (퍼지로직 과열도 재설정 알고리즘을 사용한 멀티형 냉방시스템의 전자팽창밸브 제어)

  • 한도영;이상원
    • Korean Journal of Air-Conditioning and Refrigeration Engineering
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    • v.15 no.5
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    • pp.382-388
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    • 2003
  • Refrigerant flow rates of the multi-type air-conditioning system can be regulated by electronic expansion valves (EEV). The performance of the multi-type air-conditioning system may be improved by lowering the superheat at the compressor suction side. In this study, a superheat temperature setpoint reset algorithm was developed by using fuzzy logics, and a PI algorithm was applied to control the superheat temperature near setpoints. Experimental results showed energy savings and stable operations at a multi-type air-conditioning system. Therefore, the developed setpoint reset algorithm may be effectively used for the EEV superheat temperature control of the multi-type air-conditioning system.

Control of Compressors and Electronic Expansion Valve considering the Safe Operation of a Tandem-type Air-conditioning system (텐덤형 냉방시스템의 안전운전을 고려한 압축기와 전자팽창밸브 제어)

  • Han, Do-Young;Kim, Jae-Hyun
    • Proceedings of the SAREK Conference
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    • 2006.06a
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    • pp.675-680
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    • 2006
  • Capacities of a tandem-type air-conditioner may be modulated by turning on and off of multiple compressors, and adjusting the position of a electronic expansion valve. In this study, control algorithms for compressors and a electronic expansion valve were developed by using fuzzy logics. The pressure control algorithm was also developed for the safe operation of compressors. There algorithms were implemented in a test lab and proved to be effective for the control of indoor air temperature and superheat temperature,

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Studies on the Performance of a Cam Driving Electronic Expansion Valve for Vehicles (캠구동 방식을 적용한 자동차 공조시스템용 전자팽창밸브의 성능에 관한 연구)

  • Kim, Sung Chul
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.17 no.9
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    • pp.732-736
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    • 2016
  • Air conditioning part designs are moving towards higher efficiency and productivity. The expansion device is one of the core parts of an air conditioning system and controls the refrigerant quantity, evaporation load, compression capacity, and condensation capacity. In this study, an electronic expansion valve for two working fluids ($CO_2$ and R134a) was developed for air conditioning systems in vehicles. The valve uses an eccentric cam driving structure instead of a lead screw to decrease manufacturing costs and increase productivity. The pressure resistance and flow rate performance was evaluated using numerical analysis. At maximum operation conditions and burst pressure conditions with $CO_2$, the maximum stresses on the valve model were about 98 MPa and 223 MPa, respectively. The maximum flow rates of $CO_2$ and R134a with different orifice openings were about 550 kg/h and 386 kg/h, respectively. The performance with R134a was verified by experiments.

A Dynamic Simulation Model of Electronic-Expansion-Valve-Controlled Evaporators (전자팽창밸브 제어성능 모사용 증발기 동특성 모델링)

  • Shin, Young-Gy;Cho, Soo;Tae, Choon-Seob;Jang, Cheol-Yong
    • Korean Journal of Air-Conditioning and Refrigeration Engineering
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    • v.19 no.2
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    • pp.183-190
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    • 2007
  • Controlling superheat of indoor units associated with a multi-type heat pump is one of difficult tasks to be addressed. This study suggests a dynamic model of an evaporator based on heat and mass balance. Thermodynamic properties are calculated by a commercial software, Refprop. The model is programmed in MFC Visual C++ for controller interface in real-time mode. The simulation results shows that PI control works for a narrow range of superheat. Beyond the range, the temperature behavior of the refrigerant is quite nonlinear mainly due to phase change. Thus, it is concluded that PI control of superheat has to be supplemented by nonlinear control ideas to avoid saturation and excessive superheat.

Analysis and Performance Test of an Electronic Expansion Valve for CO2 (CO2 냉매용 전자팽창밸브의 해석 및 평가)

  • Kim, Ook-Joong;Yoon, Seok-Ho;Hong, Yong-Ju;Kim, Jeong-Yup;Kang, Sin-Il
    • Proceedings of the SAREK Conference
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    • 2009.06a
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    • pp.1491-1496
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    • 2009
  • Fluid flow and structural analyses of an electronic expansion valve (EEV) using CO2 as a working refrigerant are carried out to estimate the mass flow rate and maximum stress. An engineering sample EEV that the orifice diameter is 1.8 mm was fabricated. The mass flow rates were measured at various EEV inlet temperatures and pressures for several EEV openings using experimental heat pump system. The sample EEV has over 35 MPa burst pressure and the maximum mass flow rate of CO2 through the EEV increased to 100 g/s at full opening condition.

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