Simulation of Double-Stage Absorption Heat Pumps for Low Grade Waste Heat Recovery

Author

Yang Xiaojing ; You Shijun ; Zhang Huan

Author_Institution

Sch. of Environ. Sci. & Technol., Tianjin Univ., Tianjin, China

fYear

2011

fDate

25-28 March 2011

Firstpage

1

Lastpage

4

Abstract

Four types of double-stage Water-Lithium Bromide absorption heat pump systems were introduced to recover waste heat of about 40°C. Thermodynamic and heat transfer numerical simulation was carried out to predict the performance of these absorption heat pumps. The effects of the driving heat source (steam) input pressure, the waste heat outlet temperature, and the hot water inlet temperature on the system performance EER were investigated in detail. It is found that the Series-flow type and Reverse Series-flow type are almost same, but the Reverse Parallel-flow type of the absorption heat pump system is with the best system performance. The thermal efficiency (EER) of the Reverse Parallel-flow type is about 0.1 higher than the Series flow type.

Keywords

absorption; flow; heat pumps; heat recovery; heat transfer; lithium compounds; numerical analysis; thermodynamics; waste heat; LiBr; double-stage absorption heat pump; driving heat source input pressure; heat transfer numerical simulation; hot water inlet temperature; low grade waste heat recovery; reverse parallel-flow type; series flow type; temperature 40 degC; thermal efficiency; thermodynamic; waste heat outlet temperature; Absorption; Heat pumps; Heat recovery; Heat transfer; Thermodynamics; Waste heat; Water heating;

fLanguage

English

Publisher

ieee

Conference_Titel

Power and Energy Engineering Conference (APPEEC), 2011 Asia-Pacific

Conference_Location

Wuhan

ISSN

2157-4839

Print_ISBN

978-1-4244-6253-7

Type

conf

DOI

10.1109/APPEEC.2011.5748967

Filename

5748967