Abstract:
PROBLEM TO BE SOLVED: To provide a heat exchanger with very high heat exchange efficiency, and superior energy saving performance. SOLUTION: A windward heat exchanger 11 and a leeward heat exchanger 12 are provided, having heat transfer tubes 13 inserted in tabular fins 10, 10, and provided in a plurality of rows in a perpendicular direction to a flow direction of gas. In the heat exchanger, a width size L of the tabular fin of the windward heat exchanger 11 is formed larger than a width size L2 of the tabular fin of the leeward heat exchanger 12, and a tube outer diameter D of the heat transfer tube 13 is set 7-8.5 mm. Since heat flow velocities shared by the heat transfer tubes of each row will be equalized, particularly, frost formation in a first row becomes small when a temperature of the gas is low, and efficiency of the heat exchanger can be improved. COPYRIGHT: (C)2009,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To provide a refrigerating cycle device capable of improving operational efficiency by extracting maximum efficiency of an evaporator by properly controlling an amount of a refrigerant flowing in a bypass circuit in an initial stage of a defrosting operation and a cooling operation under a condition of low outside air temperature. SOLUTION: The refrigerating cycle device 1a includes: a main refrigerant circuit 2 including a supercooling heat exchanger 23; the bypass circuit 3 passing through the supercooling heat exchanger 23; and a control device 4a controlling a main expansion valve 24 in the main refrigerant circuit 2 and a bypass expansion valve 31 in the bypass circuit 3. An amount of the refrigerant flowing in the bypass expansion valve 31 is decreased so that an evaporator inlet temperature reaches a refrigerant saturation temperature when an inlet temperature of a use-side heat exchanger 25 as the evaporator is lower than the refrigerant saturation temperature calculated from an inlet refrigerant pressure of the use-side heat exchanger 25. COPYRIGHT: (C)2011,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To provide a refrigerating cycle apparatus that conducts an opening setting of a bypass expansion valve that shortens time where the cooling cycle is stable, and to provide a hot water heating device. SOLUTION: The refrigerating cycle apparatus 1 includes: a cooling circuit 2 where an overcooled heat exchanger 23 is provided; a bypass passage 3 that bypasses the overcooled heat exchanger 23; and a control apparatus 4 that controls a bypass expansion means 31 in a primary expansion means 24 and the bypass passage 3 in the refrigerant circuit 2. When the bypass expansion means 31 is opened within a predetermined time until a predetermined opening that is set based on the temperature of a fluid to be heated and a fluid to be cooled at start of operation, the means is less influenced by the cooling medium or variation in temperature until the cooling cycle is stable, which drastically reduces time until the cooling cycle is stable. COPYRIGHT: (C)2011,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To provide a heat pump water heater, performing defrosting operation in a short time by effectively utilizing heat of heat radiator stored during boiling operation without radiating heat by a heat radiator during the defrosting operation. SOLUTION: The heat pump water heater comprises: a first bypass circuit 17 connecting a refrigerant inlet of the heat radiator with a refrigerant outlet of the heat radiator 12, and connecting a refrigerant outlet of a decompressor 13 with a refrigerant inlet of an evaporator 14; and a first flow control valve 18 adjusting a flow rate of the refrigerant flowing in the first bypass circuit 17. Heat of the refrigerant discharged from a compressor 11 of which the heat is not removed by a low temperature part of the radiator 12, and a heat stored in a high temperature part of the radiator during the boiling operation are supplied to the evaporator 14 to perform the defrosting operation in a short time. COPYRIGHT: (C)2009,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To suppress heat radiation to the surrounding from a high temperature part and reduce power consumption for boiling operation without enlargement of a box body in a heat pump water heater. SOLUTION: The heat pump water heater includes the box body incorporating a portion of a heat pump cycle and a boiling flow passage, a high temperature fluid side pipe connecting tool 1 disposed on the outside of the box body for connecting the boiling flow passage and an outflow flow passage to a box body outer portion, and a low temperature fluid side pipe connecting tool 2 disposed on the outside of the box body for connecting the boiling flow passage to an inflow passage from the box body outer portion, wherein the high temperature fluid side pipe connecting tool 1 has a heat insulating layer 3 around its periphery. Heat radiation from the high temperature fluid side pipe connecting too1 1 to the surrounding is suppressed, and thermal energy loss can be reduced, so that an effect that the power consumption for boiling operation can be reduced is displayed. COPYRIGHT: (C)2009,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To provide a refrigerating cycle device capable of performing an operation of high energy efficiency regardless of an inflow temperature of heat receiving fluid of a radiator and an inflow temperature of heat giving fluid of an evaporator. SOLUTION: A refrigerating cycle for circulating a refrigerant is constituted by successively connecting at least a compressor 1, the radiator 2, a first pressure reducing mechanism 3, a second pressure reducing mechanism 5 and the evaporator 6, an opening of the pressure reducing mechanism 3 at the upstream side is controlled on the basis of the inflow temperature of the heat receiving fluid of the radiator 2 and the inflow temperature of the heat giving fluid of the evaporator 6 to optimize refrigerant-refrigerant heat exchange amount in an internal heat exchanger 4 in the pressure reducing mechanisms 3, 5 at the upstream side and downstream side of a high pressure-side refrigerant flow channel of the internal heat exchanger 4, thus the operation of high energy efficiency can be performed regardless of the inflow temperature of the heat receiving fluid of the radiator 2 and the inflow temperature of the heat giving fluid of the evaporator 6. COPYRIGHT: (C)2009,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To provide a heat pump water heater capable of suppressing an increase in water inflow temperature and performing hot water storage operation with high energy efficiency. SOLUTION: The heat pump water heater includes a hot water storage circuit having an upper side flow passage 17 making a radiator 2 communicate with an approximately upper part of a hot water storage tank 11, a lower side flow passage 18 making the radiator 2 communicate with an approximately lower part of the hot water storage tank 11, and a flow passage switching means 13 selecting either of the upper side flow passage 17 or the lower side flow passage 18 to switch the flow passage. Switching control by the flow passage switching means 13 during a change from defrosting operation for stopping a circulating pump 12 and operating a compressor 1 to remove frost formation on an evaporator 4 to hot water storage operation for operating the circulating pump 12 and the compressor 1 and heating heated fluid by the radiator 2 to store hot water in the hot water storage tank 11 is changed according to a time zone. COPYRIGHT: (C)2010,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To provide a heat pump water heater capable of achieving efficient boiling operation and defrosting operation without making high-temperature water stored in a hot water storage tank nonuniform. SOLUTION: The heat pump water heater includes: a compressor 11; a radiator 12; a decompression device 13; an evaporator 14; the boiling operation heating water to predetermined set temperature by the radiator 12; the defrosting operation for removing frost adhered on the evaporator 13; and a control means 40. The boiling operation after completion of the defrosting operation is performed by increasing discharge temperature of the compressor 11. Since the discharge temperature is increased without changing set boiling temperature, the efficient boiling operation and defrosting operation can be performed without making the temperature of the high-temperature water stored within the hot water storage tank 30 nonuniform. COPYRIGHT: (C)2010,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To provide a heat pump device which downsizes a refrigeration device by making a contour of an oil separator smaller and does not cause reduction in capacity although a compressor is used for a long term. SOLUTION: The heat pump device includes: a heat pump circuit formed of the compressor 21, a radiator 23, a decompression means 24, and an evaporator 25 for discharging refrigerant compressed by a compression mechanism part in a sealed container with lubrication oil enclosed therein from a discharge port provided for the sealed container to the outside of the sealed container; an oil separator 27 for separating the lubrication oil from the refrigerant in the heat pump circuit; and an oil feeding part 30 for returning the lubrication oil separated by the oil separator 27 to an intake side of the compressor 21. The oil feeding part 30 is arranged with an oil absorber 31 for absorbing/desorbing the lubrication oil. The lubrication oil accumulated in the oil separator 27 can be returned to the inside of the compressor 21 by absorption force of the oil absorber 31. COPYRIGHT: (C)2010,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To provide a storage water heater capable of performing hot water supply operation with high energy efficiency by using heat quantity of expansion water of high temperature which has been discharged in conventional cases. SOLUTION: The lower part of a hot water storage tank 41, an expansion water heat exchanger 49, a refrigerant circulation circuit 50 and the upper part of the hot water storage tank 41 are interconnected annularly. Water in the lower part of the hot water storage tank 41 is heated by the refrigerant circulation circuit 50, and hot water is stored from the upper part of the hot water storage tank 41. A pressure relief valve 48 for discharging expansion water within the hot water storage tank 41 to reduce the inner pressure of the hot water storage tank 41 when the pressure within the hot water storage tank 41 exceeds predetermined pressure is connected to the upper layer part of the hot water storage tank 41. Heat exchange is performed between the expansion water discharged from the pressure relief valve 48 and the water made to flow out from the lower part of the hot water storage tank 41 by the expansion water heat exchanger 49. Thus, since the heat quantity of the expansion water of high temperature which has been discharged in conventional cases can be used, hot water supply operation with high energy efficiency can be performed. COPYRIGHT: (C)2010,JPO&INPIT