摘要:
A heat pump apparatus includes a heat source-side refrigeration cycle sequentially connecting a compressor 1, a heat source-side heat exchanger, an expansion valve 4, and a heat source side of a cascade heat exchanger 5, and configured to circulate refrigerant, and a load-side refrigeration cycle sequentially connecting a heat medium sending unit, a load-side heat exchanger, and a load side of the cascade heat exchanger 5, and configured to circulate a heat medium. The heat source-side heat exchanger and the cascade heat exchanger 5 each have an equivalent diameter of less than 1 mm, which is calculated by 4 x S/L, where S represents a cross-sectional area of a fluid passage and L represents a length of a wetted perimeter.
摘要:
An object of the invention is to provide a heat exchanger capable of reducing an amount of refrigerant stagnated in heat-transfer tubes and decreasing a pressure loss in heat-transfer tubes of the heat exchangers as a whole. A heat exchanger including a first heat exchanger 101 disposed on upstream side of a heat exchange fluid and a second heat exchanger 102 disposed on downstream side of the heat exchange fluid, which are connected in series in a flow path of a heat medium, wherein the heat medium flows from the first heat exchanger 101 to the second heat exchanger 102 so as to be parallel to the flow of the heat exchange fluid when the heat exchanger serves as an evaporator, the heat medium flows from the second heat exchanger 102 to the first heat exchanger 101 so as to be opposed to the flow of the heat exchange fluid when the heat exchanger serves as a condenser, and a sum of flow path volume of first heat-transfer tubes of the first heat exchanger 101 is smaller than a sum of flow path volume of second heat-transfer tubes of the second heat exchanger.
摘要:
A heat exchanger includes a heat transfer tube having an internal flow path through which a heat medium flows, the heat transfer tubes being arranged in a plurality of columns in a column-wise direction in which a heat-exchange medium passes through; a column bridging portion 5 being a heat medium-flow path connecting a pair of the heat transfer tubes arranged adjacent to each other in the column-wise direction; a header 4 to which the heat transfer tubes are connected, the column bridging portion 5 being provided inside the header 4; and a refrigerant partition plate 7 installed in the heat medium-flow path inside the column bridging portion 5.
摘要:
A stacking-type header (2) according to the present invention includes: a first plate-shaped unit having a plurality of first outlet flow passages (11 A) formed therein; and a second plate-shaped unit (12) stacked on the first plate-shaped unit (11), the second plate-shaped unit (12) having a distribution flow passage (12A) formed therein, the distribution flow passage (12A) being configured to distribute refrigerant, which passes through a first inlet flow passage (12a) to flow into the second plate-shaped unit (12), to the plurality of first outlet flow passages (11A) to cause the refrigerant to flow out from the second plate-shaped unit (12), in which the distribution flow passage (12A) includes a branching flow passage (12b) including: an opening port configured to allow the refrigerant to flow thereinto; a first flow passage communicating between the opening port and an end portion positioned on an upper side relative to the opening port; and a second flow passage communicating between the opening port and an end portion positioned on a lower side relative to the opening port, and in which the branching flow passage (12b) is smaller in difference in flow resistance between the first flow passage and the second flow passage than a branching flow passage in a state in which a flow-passage resistance in the first flow passage and a flow-passage resistance in the second flow passage are equal to each other, and in a state in which the first flow passage and the second flow passage are point symmetric with each other about the opening port.
摘要:
Even with a plurality of heat exchange function surface units, a heat exchanger (1) can suppress an influence of the gravity exerted on refrigerant and suppress reduction of heat exchange performance in each of the surfaces. The heat exchanger (1) has the plurality of heat exchange function surface units (3), and includes an upper header pipe (5), a lower header pipe (7), and a plurality of heat exchange pipes (9) provided between the pair of upper and lower header pipes in each of the heat exchange function surface units. The plurality of heat exchange function surface units have a parallel connection relationship, and a plurality of the lower header pipes are connected to a lower collection pipe (19) through a branch current adjusting section (17).
摘要:
It is intended to realize an air conditioning system of high operational efficiency without reducing the user's comfort. In an air conditioning system 1, a set temperature determining device 31 determines a target temperature of water to be supplied to an indoor heat exchanger 12, based on ["target outflow temperature" = "current outflow temperature" + (("inlet and outlet temperature difference" / "indoor and outdoor temperature difference") × "set temperature difference")]. The indoor and outdoor temperature difference is a difference between an indoor temperature and an outdoor temperature, the inlet and outlet temperature difference is a difference between temperatures of water at the inlet side and the outlet side of an intermediate heat exchanger 9, and the set temperature difference is a difference between an indoor temperature and a set temperature. A control device 32 controls an outdoor unit 2 in response to the target temperature determined by the set temperature determining device 31.
摘要:
To obtain an air-conditioning apparatus that makes no refrigerant circulate into an indoor unit and can achieve energy-saving. A refrigeration cycle is configured by connecting a compressor 10 that compresses the refrigerant, a four-way valve 11 that switches the circulation path of the refrigerant, a heat source side heat exchanger 12 that exchanges heat, expansion valves 16a to 16d that adjust the pressure of the refrigerant, and two or more intermediate heat exchangers 15a and 15b that exchange heat between the refrigerant and the heat medium to heat and cool the heat medium, by piping. A heat medium circulation circuit is configured by connecting two or more intermediate heat exchangers 15a and 15b, pumps 21a and 21b that pressurize the heat medium, two or more use side heat exchangers 26a to 26d that exchange heat between the heat medium and the air in the indoor space 7, and flow path switching valves 22a to 22d and 23a to 23d that switch pass of the heated heat medium or the cooled heat medium to the use side heat exchangers 26a to 26d, by piping.
摘要:
A ventilation and air conditioning apparatus for a vehicle includes: a ventilator 2 that sucks air from outside the vehicle; an air conditioner 3 that conditions air inside the vehicle; a duct 4 for fresh outside air that connects the ventilator 2 with the air conditioner 3 so as to supply the air that the ventilator 2 has sucked from outside the vehicle to the air conditioner 3; and a duct 5 for conditioned air that supplies the conditioned air blown out from the air conditioner 3 to inside the vehicle. The duct 4 for fresh outside air is branched so as to be connected to the duct 5 for conditioned air. With this configuration, even if the operation of the air conditioner is stopped due to, e.g., a leakage of a flammable refrigerant, an amount of ventilation can be secured in the vehicle.