Combined heating unit for heat-transfer fluid

This paper considers a combined heating unit for heat-transfer fluid. The system is unique due to the use of new combinations of device components. The offered design of the combined heating unit consists of solar, heat and electric heaters. Locking and regulating devices enable heating heat-transfer fluid. Heat-transfer fluid is heated by separately turning on the heaters. When calculating the heating and hot water supply systems, no separation of heat carrier is considered. The system uses as heating agents both combustion gases and hot air supplied by boiler and subsequently returned after cooling. The paper specifies the heat balance equation and mentions decrease of heat losses with leaving gases due to heat-transfer fluid combined heating.