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냉매 충진량과 모세관 길이변화에 따른 R410A 적용 가정용 에어컨 성능의 실험적 고찰
조진표(J. P. Cho),오왕규(W. K. Oh),김내현(N. H. Kim),김영수(Y. S. Kim),구명수(M. S. Koo),윤긍식(K. S. Yun),최영훈(Y. H. Choi) 대한기계학회 2001 대한기계학회 춘추학술대회 Vol.2001 No.9
In this study, we evaluated the performance of residential split type air-conditioner using alternative refrigerant R410A. Tested were variations of charging conditions and capillary tubes length. The objective of this study was to quantify the influence of the refrigerant charge and capillary tubes under the steady state operation of a split type air-conditioning system. as the refrigerant charge is increased, both the evaporating and condensing temperature increase gradually, and the cooling capacity, EER, power consumption has optimum refrigerant charge. In case of inner diameter 1.6㎜, length 1000㎜ that a 10% under charge cause 3.5% reduction in the cooling capacity.
평행류 열교환기가 적용된 무선통신 중계기 냉각용 슬림형 공조기
조진표(J.-P. Cho),김내현(N.-H. Kim) 대한설비공학회 2009 설비공학 논문집 Vol.21 No.2
Slim telecommunication cabinet cooler, equipped with parallel flow heat exchangers and operating with R-22, is developed. The performance is compared with imporled one, equipped with fin-tube heat exchangers and operating with R-134a. Test resulLs show that the newly-developed cooler increases the cooling capacity by 6% and EER by 33%. The refrigerant charge for the developed cooler is 500 g compared with 1250 g for the imported one. The adoption of parallel flow heat exchanger appears to have reduced the refrigerant charge. In addition, it is shown that the reduced air flow rates through parallel heat exchangers as compared with those through fin-tube heat exchangers are beneficial to the reduction of the equipment noise.
물결형 슬릿핀이 장착된 핀-관 열교환기의 습표면 성능 실험
김내현,김정식,조진표,윤재호,백종현,이순구,남승백,권형진,Kim, N.H.,Kim, J.S.,Cho, J.P.,Yun, J.H.,Peck, J.H.,Lee, S.G.,Nam, S.B.,Kwon, H.J. 대한설비공학회 1997 설비공학 논문집 Vol.9 No.2
In this study, the wet surface heat transfer coefficients and friction factors of the heat exchanger with slit-wavy fin were measured. Four sample cores of two or three row with fins of 12 fpi or 16 fpi were tested. Tests were conducted in a closed loop wind tunnel, where the heat exchanger was mounted at 45 degree inclination angle. The wet surface heat transfer coefficient was reduced following the procedure given in ARI 420-81. During the course, new definitions of the $\varepsilon$-NTU applicable to enthalpy driving system were introduced. The wet surface heat transfer coefficients were approximately equal to the dry surface values. However, the friction factors were approximately 120% to 170% higher than those of the dry surface. Both the heat transfer coefficient and the friction factor of the wet surface increased as the relative humidity increased, fin pitch decreased, and the number of row decreased, although the difference was not large.