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Results from measurements of heat pump for district heating using ambient air as heat source.
Number: 0103
Author(s) : HANSEN S. O. K., JENSEN J. K., DOMINATO M., REINHOLDT L. O., MARKUSSEN W. B.
Summary
Intensive measurements on 2 out of 20 evaporators have been made on a 6.5 MW ammonia heat pump for district heating at Brædstrup Fjernvarme Amba in Denmark as part of a project called “Optimization of large heat pumps using ambient air”. The goal of the project is to optimize and develop the evaporator design and control of the heat pump in relation to frosting, defrosting, and noise. The system is af pump circulation type with evaporators of flatbed type having 8 fans each designed for direction of air flow downwards. The measurements include the weight of the evaporators, the electrical power consumption of each fan, temperatures of air entering and leaving the evaporator, refrigerant flow, and temperatures of the evaporator coils. CFD-work compared to analysis of the measurements shows recirculation of air depending on wind direction and speed. Analysis of measurements have led to development of a new defrost control for effective defrost with use of minimum energy. This paper presents interesting results and conclusions about performance and defrost from the measurements.
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Details
- Original title: Results from measurements of heat pump for district heating using ambient air as heat source.
- Record ID : 30029710
- Languages: English
- Subject: Technology
- Source: 15th IIR-Gustav Lorentzen Conference on Natural Refrigerants (GL2022). Proceedings. Trondheim, Norway, June 13-15th 2022.
- Publication date: 2022/06/13
- DOI: http://dx.doi.org/10.18462/iir.gl2022.0103
- Document available for consultation in the library of the IIR headquarters only.
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