Method and arrangement for defrosting a vapor compression system

US6931880B2 · kind B2 · utility

Assignee

• Sinvent AS · NO

Inventors

• Kare Aflekt · Trondheim, NO
• Einar Brendeng · Trondheim, NO
• Armin Hafner · Trondheim, NO
• Petter Neksa · Trondheim, NO
• Jostein Pettersen · Trondheim, NO
• Havard Rekstad · Trondheim, NO
• Geir Skaugen · Trondheim, NO
• Gholam Reza Zakeri · Bad Vilbel, DE

Key dates

• Filing date: Aug 31, 2001
• Grant date: Aug 23, 2005
• Expiry date: Aug 31, 2021

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F25B2600/2501
• WIPO field: Thermal processes and apparatus
• WIPO sector: Mechanical engineering

Abstract

A method of defrosting of a heat exchanger (evaporator) in a vapor compression system including, downstream of a heat exchanger (evaporator) (3) to be defrosted, at least a compressor (1), a second heat exchanger (condenser/heat rejecter) (2), and an expansion device (6) connected by conduits in an operable manner to form an integral closed circuit. The heat exchanger (3) to be defrosted is subjected to essentially the same pressure as the compressor's (1) discharge pressure. Thus, the heat exchanger (3) is defrosted as the high-pressure discharge gas from the compressor (1) flows through to the heat exchanger, giving off heat to the heat exchanger (3). In the circuit, in connection with the expansion device (6) a first bypass loop 23 with a first valve (16′), is provided. A pressure reducing device (6′) is provided in a second bypass loop in conjunction with a second valve (16′″) disposed downstream of the heat exchanger (3) being defrosted, whereby the first valve (16′) is open and the second valve (16′″) is closed when defrosting takes place.