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Main Title: The formation of non-condensable gases in ammonia/ water absorption heat pumps made of stainless steel - literature review and experimental investigation
Author(s): Moser, Harald
Zotter, Gerald
Kotenko, Oleksandr
Rieberer, René
Type: Book Part
Language: English
Language Code: en
Abstract: Highly efficient ammonia/water absorption heat pumping (AHP) processes (e.g. the GAX-process) require a high desorption temperature level of e.g. 200°C and above. At these conditions the formation of non-condensable gases can take place, which can be dedicated to two chemical processes: corrosion of steel and thermal decomposition of ammonia. Within a research project the possible use of stainless steel components at high temperature level has been investigated. Tests with an absorption/desorption test rig operating at temperatures up to 290°C as well as corrosion tests using autoclaves at temperatures up to 220°C have been performed. The produced non-condensable gas has been analysed using gas-phase chromatography in order to identify the responsible chemical process. The results show a large initial corrosion rate which decreases with time. This may be explained by a passivation process of the steel surface. At all tests the carbon steel (ST37) autoclaves has shown significant lower corrosion rates compared to the stainless steel components. Regarding the thermal decomposition no dissociation products has been detected up to a temperature level of 290°C.
URI: urn:nbn:de:kobv:83-opus4-62050
Issue Date: 2013
Date Available: 16-Jan-2015
DDC Class: 620 Ingenieurwissenschaften und zugeordnete Tätigkeiten
Subject(s): Absorption
Ammonia decomposition
Heat pump
Non-condensable gases
Thermally driven
Book Title: Thermally driven heat pumps for heating and cooling
Publisher: Universitätsverlag der TU Berlin
Publisher Place: Berlin
Page Start: 221
Page End: 230
Notes: Part of: Thermally driven heat pumps for heating and cooling. – Ed.: Annett Kühn – Berlin: Universitätsverlag der TU Berlin, 2013 ISBN 978-3-7983-2686-6 (print) ISBN 978-3-7983-2596-8 (online) urn:nbn:de:kobv:83-opus4-39458 []
Appears in Collections:Zentrale & sonstige Einrichtungen » Publications

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