Abstract
In solar heating systems with an absorber area of more than 20 m2, a plate heat exchanger is used as a separator between the primary glycol-based refrigerant and secondary water. The use of a plate heat exchanger enables an increase in the heat exchange area compared to the standard coil heat exchangers located inside the domestic hot water tank. An important problem is to determine the volume flow rate on both the primary and secondary side of the exchanger. The paper presents an analysis of the influence of the circulation pump efficiency on the primary and secondary side of the heat exchanger installed in a solar heating installation on the intensity of the heat exchange process.
Highlights
A plate heat exchanger is used as a separator for the exchange of heat between two different working media
The plate heat exchanger is used as a separator between a collector bank connected to the primary side of the heat exchanger, where the working medium is a propylene glycol-based refrigerant, and a domestic hot water storage tank (DHW) connected to the secondary side of the heat exchanger that constitutes a thermal load for solar collectors
The use of an external plate heat exchanger instead of a DHW storage tank with a coil heat exchanger allows for virtually unlimited selection of heat exchange surfaces
Summary
A plate heat exchanger is used as a separator for the exchange of heat between two different working media. The plate heat exchanger is used as a separator between a collector bank connected to the primary side of the heat exchanger, where the working medium is a propylene glycol-based refrigerant, and a domestic hot water storage tank (DHW) connected to the secondary side of the heat exchanger that constitutes a thermal load for solar collectors. The use of an external plate heat exchanger instead of a DHW storage tank with a coil heat exchanger allows for virtually unlimited selection of heat exchange surfaces In this manner, it is possible to increase the amount of transferred solar energy accumulated through the aperture of collectors and, to reduce the time required for hot water production. It is necessary to analyze dynamic properties of the heat exchange process in the plate heat exchanger
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