Heat-medium discharge device

Abstract

Provided is a heat-medium discharge device which, when vent sections are opened substantially simultaneously and a heat medium in the heat-medium channels of a plurality of solar-heat collection devices flows downward and is discharged due to an elevation difference, is capable of using the pressure of the downward-flowing heat medium to prevent the heat medium from spilling from a vent section as a result of backflow by the heat medium in some of the heat-medium channels. The heat-medium channels (2) of the solar-heat collection devices (1) are provided with an elevation difference in order to cause the heat medium to flow downward in the heat-medium channels (2) to an angled pipe (5). The highest section of the heat-medium channels (2) is provided with a vent section (15) capable of opening and closing and capable of introducing air when discharging the heat medium. The vent section (15) is provided with a spillage prevention means for preventing spillage of the heat medium from the vent section (15) when the heat medium in the heat-medium channels flows backward against the discharge direction. The spillage prevention means is configured from a vent valve and a backflow valve, or a pressure meter (32) for measuring the pressure inside the heat-medium channels (2) and a vent valve (15b) for closing the vent section (15) when the measured value from the pressure meter (32) is a positive value.