암모니아-물 기포분사형 흡수과정에서의 흡수열 제거를 위한 열전달 특성 연구

이재철; 이기봉; 전병희; 이찬호; 하종주; 김성현

Clean Technology, Vol.7, No.4, 273-280, December, 2001

A Study on Heat Transfer Characteristics for Removal of Absorption Heat in Absorption Process of Ammonia-Water Bubble Mole

이재철, 이기봉, 전병희, 이찬호, 하종주, 김성현

초록

흡수기는 흡수식 열펌프 시스템에서 중요한 구성요소일 뿐만 아니라 흡수기의 성능은 전체 시스템에 중요한 영향을 미친다. 본 연구에서는 기포분사형 흡수기에서의 암모니아기체의 흡수열의 효과적 제거를 위한 냉각수 방향으로의 열전달에 대해 실험적 연구를 수행하였다. 흡수기에 유입되는 암모니아 기체의 유속, 암모니아 수용액의 유속, 농도, 온도, 흡수기의 지름, 높이, 기체와 용액의 유입 방향등 여러 가지 변수에 대하여 열전달 성능의 특성을 살펴본 결과, 기체의 주입량, 용액의 주입량 증가는 열전달 성능 향상에 기여하며, 용액의 온도나 농도의 상승은 열전달 성능에 방해요소로 작용하였으며 흐름방향이 향류인 경우 열전달 성능에 향상이 있었다. 본 실험의 데이터를 이용하여 상관관계식을 유도하여 열전달에 대한 복잡한 관계를 일반화 하였다.

An absorber is a major component in the absorption refrigeration systems and its performance greatly affects the overall system performance. In this study, experimental analyses on heat transfer characteristics for removal of absorption heat in ammonia-water bubble mode absorber were performed. Heat transfer coefficients were estimated as the variations of input gas flow rate, solution flow rate, temperature, concentration, absorber diameter and height, and input flow direction. The increase of gas and solution flow rate affects positively in heat transfer. However, the increase of solution temperature and concentration affects negatively. Moreover, under the same Reynolds Numbers, countercurrent flow is superior to cocurrent flow in heat transfer performance. In addition, from these experimental data, empirical correlations which can explain easily the characteristics of heat transfer are derived.

Keywords:Adsorption Process;Absorption Heat Pump;Heat Transfer;Bubble Mode;Ammonia-Water

[References]

Kang YT, Akisawa A, Kashiwagi T, International Journal of Refrigeration, No. 22, pp. 250-262 (1999)
Sujatha KS, Mani A, Murthy SS, Int. Commun. Heat Mass Trans., 26(7), 975 (1999)
Kang Y, Lim WM, Kim SD, HWAHAK KONGHAK, 25(5), 460 (1987)
Lee KB, Chun BH, Lee JC, Park CJ, Kim SH, Korean J. Chem. Eng., 19(1), 87 (2002)
Lee KB, Chun BH, Lee JC, Park CJ, Kim SH, Experimental Heat Transfer, In Press (2001)
Seader JD, Henley EJ, "Separation Process Principles," Wiley, New York, pp. 123 (1998)
Lee KB, "Study of the Absorber for Ammonia-Water Absorption Heat Pump," MA. Thesis, Korea University, Seoul, Korea (2001)
McCabe WL, Smith JC, Harriott P, "Unit Operations of Chemical Engineering," McGraw-Hill, Singapore, pp. 115 (1993)

[1] Kang YT, Akisawa A, Kashiwagi T, International Journal of Refrigeration, No. 22, pp. 250-262 (1999)

[2] Sujatha KS, Mani A, Murthy SS, Int. Commun. Heat Mass Trans., 26(7), 975 (1999)

[3] Kang Y, Lim WM, Kim SD, HWAHAK KONGHAK, 25(5), 460 (1987)

[4] Lee KB, Chun BH, Lee JC, Park CJ, Kim SH, Korean J. Chem. Eng., 19(1), 87 (2002)

[5] Lee KB, Chun BH, Lee JC, Park CJ, Kim SH, Experimental Heat Transfer, In Press (2001)

[6] Seader JD, Henley EJ, "Separation Process Principles," Wiley, New York, pp. 123 (1998)

[7] Lee KB, "Study of the Absorber for Ammonia-Water Absorption Heat Pump," MA. Thesis, Korea University, Seoul, Korea (2001)

[8] McCabe WL, Smith JC, Harriott P, "Unit Operations of Chemical Engineering," McGraw-Hill, Singapore, pp. 115 (1993)