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

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

Numerical Simulation on Dynamic Characteristics of a Water Heater System Driven by a Heat Pump

열펌프 가열식 온수기의 동적특성 해석

  • 김민성 (서울대학교 기계항공공학부) ;
  • 김민수 (서울대학교 기계항공공학부) ;
  • 백남춘 (한국에너지기술연구원 대체에너지연구부)
  • Published : 2002.01.01
Download PDF
⟨ Previous Next ⟩

Abstract

A dynamic model of a water heater system heated by a heat pump was developed. The water heater system was composed of heat pump and hot water reservoirs. Finite volume method (FVM) was applied to describe the heat exchangers. A new constraint on electronic expansion valve (EEV) or thermostatic expansion valve (TXV) that can control superheat after the evaporator was developed. Dynamic performances were evaluated for various sizes of the reservoir. In order to compare those performances, time scale was normalized by time constant representing the characteristics of reservoir size. Time constant was determined from quasi steady-state simulation of the system. From the simulation, the size of the water heater reservoir was found to have a large influence on the transient performance of the sys- tem. Therefore, the optimization of the reservoir size is needed in a design process.

Keywords

References

  1. Korean J. Air-Cond. Ref. Eng. v.12 no.3 Capacity modulation of a heat pump system by changing the composition of refrigerant mixtures Kim, M.;Kim, M. S.;Kim, Y. C.
  2. Proceedings of the American Control Conference Two time constant modeling approach for residential heat pumps Tree, D. R.;Weiss, B. W.
  3. Int. J. Refrig. v.5 no.3 A simulation model of the transient performance of a heat pump Chi, J.;Didion, D. https://doi.org/10.1016/0140-7007(82)90099-8
  4. Int. J. Refrig. v.12 no.1 Unsteady compressible two-phase flow model for predicting cyclic heat pump performance and a comparison with experimental data MacArthur, W. J.;Grald, E. W. https://doi.org/10.1016/0140-7007(89)90009-1
  5. ASHRAE Transactions v.93 no.1 Performance of engine-driven heat pumps under cycling conditions Rasmussen, R. W.;MacArthur, J. W.;Grald, E. W.;Nowakowski, G. A.
  6. Numerical heat transfer and fluid flow Patankar, S. V.
  7. Experimental Heat Transfer v.1 General film condensation correlation Chen, S. L.;Gerner, F. M.;Tien, C. L. https://doi.org/10.1080/08916158708946334
  8. Chem. Eng. Res. Des. v.65 Simplified general correlation for saturated flow boiling and comparisons of correlations with data Gungor, K. E.;Winterton, R. H. S.
  9. Int. Chem. Eng. v.16 New equations for heat and mass transfer in turbulent pipe and channel flow Gnielinski, V.
  10. Thermodynamic properties of refrigerants and refrigerant mixtures database (REFPROP)(Version 5.0) Huber, M.;Gallagher, J.;McLinden, M.;Morrison, G.