Hits:

Indexed by:期刊论文

Date of Publication:2013-09-01

Journal:APPLIED THERMAL ENGINEERING

Included Journals:SCIE、EI

Volume:58

Issue:1-2

Page Number:98-107

ISSN No.:1359-4311

Key Words:District heating; Ejector; Heat pump; Waste heat recovery

Abstract:An Ejector heat pump-boosted District Heating (EDH) system is proposed to improve the heating capacity of existing district heating systems with Combined Heat and Power (CHP). In the EDH, two ejector heat pumps are installed: a primary heat pump (HP1) at the heating station and a secondary heat pump (HP2) at the heating substation. With the EDH, the low-grade waste heat from circulating cooling water in the CHP is recycled and the temperature difference between the water supply and the return of the primary heating network is increased. A thermodynamic model was provided. An experimental study was carried out for both HP1 and HP2 to verify the predicting performance. The results show that the COP of HP1 can reach 1.5-1.9, and the return water temperature of the primary heating network could be decreased to 35 degrees C with HP2. A typical case study for the EDH was analyzed. (C) 2013 Elsevier Ltd. All rights reserved.