Feasibility of a booster for DHW circulation in apartment buildings

With increasing focus on the performance of district heating systems, a concept is developed to obtain low return temperatures from domestic hot water systems with high share circulation loss. For these it challenging realize temperature by direct heat exchange only, due flow at 50 °C. The termed Circulation Booster. purpose Booster boost and same time secure this part service. heated in two steps: pump. source for heating, pump itself driven electricity. paper includes field experiences 1-year test period, concluding that operating as intended. Further, results regarding electric consumption an economic feasibility study are presented. current tariff structure Denmark related costs gives feasible case payback 5,1 years. An increasingly progressive scheme or lower could further improve concept.