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Objective:The goal of this experiment is to perform a heat balance on a hot water heating (HWH) system with the domestic hot water (DHW) and space heating circuit turned ON. To measure and compare the loss in pressure in the piping with the friction loss. To measure the time response of the DWH temperature. And to test the reverse-return and direct-return systems with respect to its self-balancing characteristic.Introduction:The hot water heating (HWH) system is widely used to heat residential and commercial buildings. The HWH system starts at the boiler, where water is heated to a predetermined temperature. The water is then pumped through pipes until it reaches the baseboard heaters. The water flows through the baseboard heater and by convection, heat is release through the heater and warms the room. The water then exits the baseboard heater and can either return to the boilerby a direct-return or reverse-return system. A direct-return system is a system where the water that enters a baseboard heater, returns to the boiler directly following the shortest path. While a