Simulation of a Double Effect Double Stage Absorption Heat Pump for Usage of a Low Temperature Waste Heat

Title & Authors
Simulation of a Double Effect Double Stage Absorption Heat Pump for Usage of a Low Temperature Waste Heat
Kim, Nae-Hyun;

Abstract
Considering the significant waste of industrial energy, effective use of low temperature waste heat is extremely important. In this study, a heat pump cycle with double effect and double stage was realized, which escalates the hot water temperature from $\small{50^{\circ}C}$ to $\small{70^{\circ}C}$ using $\small{160^{\circ}C}$ high temperature heat source and $\small{17^{\circ}C}$ low temperature heat source. The steam generated in the first generator condenses in the first condenser generating steam in the second generator. The steam condenses in the second condenser and is provided to the second evaporator. Part of the water out of the second evaporator is supplied to the first evaporator, which evaporates using low temperature waste heat. The evaporated steam enters the first absorber and the second evaporator. The steam out of the second evaporator is absorbed into the solution at the second absorber. The hot water temperature is raised in the second condenser and in the second absorber. Proper flow rates and UA values, which satisfied temperature lift $\small{20^{\circ}C}$ and COP 1.6, were deduced through trior and error. The COP increases as the temperature of the high temperature water increases, hot water temperature decreases and flow rate increases, waste water temperature and flow rate increases, solution circulation rate decreases. On the other hand, the temperature rise of the hot water increases as the temperature of the high temperature water increases, hot water temperature increases and flow rate decreases, waste water temperature and flow rate increases, solution circulation rate increases. In addition, the COP and hot water temperature rise increase as UAs of the heat exchangers increase.
Keywords
Absorption heat pump;Double effect;Double stage;Simulation;
Language
Korean
Cited by
References
1.
Park. I. W., Park, J. T. and Yoo, S. Y., "An investigation on the domestic industrial waste heat", Korean J. Air-Conditioning Refrigeration Engineering, Vol. 14, No. 10, pp. 811-816, 2002.

2.
Park, Y. S., "Technology trends on the recovery of waste heat and unused energy using a heat pump", Ministry of Science of Technology, 2011.

3.
Ma, X., Chen, J., Li, S., Sha, Q., Liang, A., Li, W., Zhang, J., Zheng, G. and Feng, Z., "Application of absorption heat transfer to recover waste heat from a synthetic rubber plant", Applied Thermal Engineering Vol. 23, pp. 797-806, 2003. DOI: http://dx.doi.org/10.1016/S1359-4311(03)00011-5

4.
Perez-Blanco, H. and Grossman, G., "Conceptual design and performance analysis of absorption heat pumps for waste heat utilization", ASHRAE Trans., Vol. 88, Part 1, pp. 451-466, 1982. DOI: http://dx.doi.org/10.1016/0140-7007(82)90058-5

5.
Grossman, G., "Adiabatic absorption and desorption for improvement of temperature-boosting absorption heat pumps", ASHRAE Trans., Vol. 88, Part 2, pp. 359-367, 1982.

6.
Grossman, G., "Multistage absorption heat transformers for industrial applications", ASHRAE Trans., Vol. 91, Part 2, pp. 2047-2061, 1985.

7.
Grossman, G. and Childs, K. W., "Computer simulation of a lithium bromide-water absorption heat pump for temperature boosting", ASHRAE Trans., Vol. 89, Part 1, pp. 240-250, 1983.

8.
Grossman, G. and Michelson, E., 1"A modular computer simulation of absorption systems" ASHRAE Trans., Vol. 91, Part 2B pp. 1808-1827, 1985.

9.
Youn, C. H., "Development of a absorption heat pump for recovery of low temperature waste heat", KIMM, 1989.

10.
Kang, S. W., Kang, B. H., Jeong, S. Y. and Lee, C. S., "Computer simulation of a absorption heat pump of the first kind for low temperature waste heat recovery", Korean J. Air-Conditioning Refrigeration Engineering, Vol. 8, No. 2, pp. 187-197, 1996.

11.
Lee, Y. H., Shin, H. J., Youn, H. C. and Park H. K., "A study on the heating and cooling system using sewage heat", J. Korean Solar Energy Society, Vol. 27, No. 4, pp. 19-26, 2007.

12.
Greiter, I., Schweigler, C., and Alefeld, G., "A 500kW absorption heat pump for heating at two temperature levels : Experience of the first heating season", Proc. Int. Absorption Heat Pump Conference, AES-Vol. 31, pp. 85-92, New Orleans, USA, 1994.

13.
World Energy Co., internal performance data, 2015.

14.
Shim, Y. S., A Study on the Absorption Heat Pump for Waste Heat Recovery, Ph. D. Thesis, Incheon National University, 2014.

15.
Harold, K. E., Radermacher, R. and S. A. Klein, Absorption Chillers and Heat Pumps, 1st ed., CRC Press, 1996.

16.
EES, F-Charts Software, www.fchart.com, 2015.