HOT-WASTEWATER HEAT RECOVERY SYSTEM

摘要

PURPOSE: To improve the hot-wastewater heat recovery rate and the precision in measuring the water flow rate by a method wherein the supply water flow rate is controlled according to the hot-water level in a hot-water storage tank, and controls are carried out so that hot-wastewater in a hot-wastewater tank is pumped and sent to a hot-wastewater heat recovery device at a flow rate in a specified proportion to the supply water flow rate that is controlled. CONSTITUTION: A flow control valve 14 is installed on a supply water line 3 leading from a water storage tank 1 to a heat source device 2 via a hot- wastewater heat recovery device 6. Two or more hot-water level sensors 10 are arranged in a hot-water storage tank 9 where hot-water heated by the heat source device 2 is stored. In addition, hot-wastewater is once stored in the hot-water storage tank 9 and then pumped and discharged by a hot- wastewater pump 12 via the hot-wastewater heat recovery device 6. The flow control valve 14 is controlled according to the water levels detected by the hot-water level sensors 10 and the hot-wastewater pump 12 is controlled by a flow controller 15 so that hot-wastewater in a hot-wastewater tank 11 is pumped and sent to the hot-wastewater heat recovery device 6 at a flow rate equivalent to 70-100% of the supply water flow rate that is controlled.