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Innovative condenser - storage tank - concept for residential heat pumps.

Number: 3252

Author(s) : DIEWALD K., FUGMANN H., SCHNABEL L., THOMAS C.

Summary

Heat pumps for space heating and domestic hot water (DHW) supply have great potential for decarbonizing the building sector. In the European Union, the F-Gas Regulation on fluorinated greenhouse gases aims to reduce the use of HFC refrigerants. Natural refrigerants, especially R290, offer great potential for efficient operation, espe-cially for heat pump applications. Heat pumps are available in a wide range for single-family houses (SFH) and small multi-family houses (MFH), therefore houses in urban areas are the focus of developments. In these areas the use of an air/water heat pump is not always possible due to the often dense population, the noise restrictions or the limited available space. For this reason, Fraunhofer ISE is investigating the combination of heat pumps and Photovoltaic thermal hybrid solar (PVT) collectors as a heat source.
The focus of this article is the heat pump system with the refrigerant cycle, the water storage tank, the heating, and the DHW circuit. An alternative concept is presented in comparison to the standard heat pump systems for heating and DHW. The goal of this system is to produce the DHW during normal heating mode without a special DHW mode. Particular attention is paid to the condenser of the heat pump, which can be designed as an immersed or mantle heat exchanger. The use of R290 makes the charge of refrigerant in the heat pumps a design criterion. Therefore, a detailed thermodynamic model of the heat pump is developed with the program language Modelica. The compressor and evaporator are fitted with data from the manufacturers to achieve realistic simulation results.
The simulation results are used to design the condensers and to compare the two types with each other. The design parameters are the coefficient of performance (COP), the achievable DHW temperature in the upper part of the storage tank and the refrigerant mass.

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  • Original title: Innovative condenser - storage tank - concept for residential heat pumps.
  • Record ID : 30032947
  • Languages: English
  • Source: 2024 Purdue Conferences. 8th International High Performance Buildings Conference at Purdue.
  • Publication date: 2024/07/15

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