Paper Conference

Proceedings of eSim 2016: 9th Conference of IBPSA-Canada


Numerical and experimental analysis of a demand-side heat exchanger for domestic hot water heating

Kristen Jaczko, Stephen J. Harrison

Abstract: Natural convection heat exchangers (NCHE) are often used in solar domestic hot water (SDHW) systems as an interface between collector fluid and domestic hot water. This configuration has been thoroughly studied, however NCHEs may be used on the demand-side of storage tanks as a protective measure against harmful legionella bacteria that can multiply in warm water storage systems. In order to predict the performance of demand-side (load-side) NCHEs, the reversethermosyphoning process must be characterized. Several tests were carried out on a heat exchanger under a variety of demand-side natural convection conditions. The data set recorded was used to develop empirical characteristic equations governing the relationship between the operating conditions and the performance indices. These equations were implemented in a system-scale TRNSYS model to simulate its performance under representative hot water demand operating conditions.
Pages: 522 - 530