Bernardo, Luis R.; Davidsson, Henrik; Karlsson, Björn - In: Energies 5 (2012) 10, pp. 4110-4131
One of the biggest obstacles to economic profitability of solar water heating systems is the investment cost. Retrofitting existing domestic hot water heaters when a new solar hot water system is installed can reduce both the installation and material costs. In this study, retrofitting existing...