Korean Journal of Air-Conditioning and Refrigeration Engineering (설비공학논문집)

The Society of Air-Conditioning and Refrigerating Engineers of Korea (대한설비공학회)
권호 표지

Optimization of Heat Transfer Area Distribution for a Hot Water Driven Absorption Chiller

중온수 흡수식 냉동기의 열전달 면적 최적화

  • 정시영 (서강대학교 기계공학과) ;
  • 조광운 (서강대학교 기계공학과 대학원) ;
  • 이상수 (서강대학교 기계공학과 대학원)
  • Published : 2000.05.01
Download PDF
⟨ Previous Next ⟩

Abstract

The major irreversibilities in absorption chillers are associated with the transfer of heat into and out from the machine and irreversible process inside the machine. By modeling only external irreversibilities(endo-reversible), a model was formulated to predict the ideal performance of a single-effect absorption chiller. Its actual performance including both external and internal irreversibilities was calculated with a in-house simulation program. The optimization of heat transfer area distribution was performed for both endo-reversible cycle and actual cycle. The equation of endo-reversible modeling was found to give about 2times higher cooling capacity than the simulation program. At optimal distribution, it was found that heat transfer area of the evaporator was about 30% of total area, that of the generator was 20%, and the rest 50% was for the absorber and condenser. The system COP for endo-reversible cycle was slightly higher than that for actual cycle. In the case of LiBr-water single-effect absorption chiller, the maximum cooling capacity was obtained near the condition that LMTD is same at all heat exchangers.

Keywords

References

  1. Proc. of the int. Sorption Heat Pump Conf. Discussion of optimized design of endo-reversible heat transformaion formation cycles F. Ziegler
  2. ASHRAE An approach for assessing the economics of sorption chillers F. Ziegler;F. Summerer
  3. Performance predictions of absorption cycles using K. E. Herold
  4. Proc. of the int. Sorption Heat Pump Con. v.37 An analysis of the major variables impacting performance of absorption chillers and heat pumps, an endo-reversible model K. E. Herold
  5. Proc. of the int. Sorption Heat Pump Conf. Optimization of ideal absorption cycles with external irreversibilities R. Tozer;B. Agnew
  6. private communication with Century private communication with Century
  7. RWTH Aachen Simulation des dynamischen Verhaltens einer periodisch wirkenden Absorption Waermepumpe mit dem Stoffgemisch Ammoniak/Wasser S. Jeong
  8. Applied Thermal Engineering v.18 no.1 Dynamic simulation of an absorption heat pump for recovering low grade waste heat S. Jeong;B. H. Kang;S. W. Kang