3152results about "Compression machines with reversible cycle" patented technology

The present invention relates to compositions for use in refrigeration, air-conditioning, and heat pump systems wherein the composition comprises a tetrafluoropropene and at least one other component. The compositions of the present invention are useful in processes for producing cooling or heat, as heat transfer fluids, foam blowing agents, aerosol propellants, and fire suppression and fire extinguishing agents.

An integrated ventilation unit configured to provide ventilation and conditioned air to an indoor space may include a heat pump system, an energy recovery device and a control unit. The heat pump system may include a first coil located at a supply air side of the ventilation unit, a second coil located at an exhaust air side of the ventilation unit, and a compressor. The energy recovery device may be configured to transfer heat between a return air stream and a supply air stream and the control unit may be configured to control operation of the heat pump system and the energy recovery device.

An automotive air conditioning system has a primary hot water circuit 11 located on a side where a vehicle installed heat generator 10 is located and a secondary hot water circuit 13 which includes a hot water type heater core 12 for heating passenger compartment outlet air, whereby when in a heating mode, in the event that a coolant temperature TW1 of the primary hot water circuit is lower than a coolant temperature TW2 of the secondary hot water circuit 13, an opening and closing valve 26 is closed, whereas an opening and closing valve 23 is opened, so that a state is created in which the hot water circuits 11, 13 are separated from each other. On the other hand, in the event that the coolant temperature TW1 of the primary hot water circuit becomes higher than the coolant temperature TW2 of the secondary hot water circuit 13, the opening and closing valve 26 is opened, whereas the opening and closing valve 23 is closed, so that a state is created in which the hot water circuits 11, 13 are connected to each other.

An HVAC system for heating and cooling a passenger compartment of a vehicle is provided. A first heat exchanger transfers heat between a primary loop and a secondary loop. The primary loop is a reversible loop and uses high pressure refrigerant. A compressor pressurizes the refrigerant. A second heat exchanger selectively transfers heat energy to and from the passenger compartment. The secondary loop is a low pressure liquid coolant loop that passes through the first heat exchanger. A pump moves fluid through the secondary loop. A third heat exchanger transfers heat to and from an external medium from the fluid passing through the secondary loop. A secondary heat source adds heat to the secondary loop during a heating mode. A bypass means selectively bypasses the secondary heat source during a cooling mode.

In an air conditioner for a vehicle, in a heating operation for heating a vehicle compartment, when heating capacity is obtained by flowing a coolant through an inside of an indoor heat exchanger, the coolant flows directly in the inside of the indoor heat exchanger to heat air to be supplied to the vehicle compartment. In contrast, when the heating capacity is not obtained by flowing the coolant through the inside of the indoor heat exchanger, the coolant flows through a first water-refrigerant heat exchanger and a refrigerant in a heat pump cycle circulates so that heat of the coolant is absorbed by the refrigerant in the first water-refrigerant heat exchanger, and the air is heated in the indoor heat exchanger by using heat of the refrigerant that has absorbed the heat of the coolant.

When a heating mode is set in a refrigerant cycle system, air is heated in a condenser by condensing high-pressure gas refrigerant, a part of high-pressure refrigerant from the condenser is decompressed in a pressure reducing unit to a middle pressure, and the other part of high-pressure refrigerant from the condenser is heat-exchanged with the middle-pressure refrigerant having passed through the pressure reducing unit in a refrigerant-refrigerant heat exchanger. Therefore, middle-pressure refrigerant having passed through the pressure reducing unit is evaporated in the refrigerant-refrigerant heat exchanger and the evaporated middle-pressure refrigerant is introduced into a gas injection port of a compressor. Thus, in the refrigerant cycle system, heating capacity can be improved due to the gas refrigerant injection into the compressor.

A liquid-based cooling system provides a method of supplying a heated coolant fluid at a relatively constant temperature and pressure to one or more heat driven engines, such as adsorption chillers or heat pumps, by utilizing a proportional flow control device in association with each of a plurality of heat-producing electronic components to optimize the output of a plurality of liquid-cooled cold plates operatively mounted on such plurality of heat-producing electronic components. The proportional flow control devices may be electro-mechanical or solid state proportional control valves for water flow control. The proportion flow control devices are operatively connected to be actuated based upon the electrical signals typically generated to control the variable cooling fans of the electronic components.

A subcool condenser having a condensation heat exchange portion, a receive portion and a supercool heat exchange portion is used as an outdoor heat exchanger that functions as a radiator in a cooling operation mode so that COP in the cooling operation mode is increased. In contrast, in a heating operation mode, a refrigerant bypass device that causes the refrigerant to flow so as to bypass the supercool heat exchange portion is provided so that pressure loss generated in the refrigerant flowing through the outdoor heat exchanger is decreased. Thereby, driving force of a compressor can be decreased and COP in the heating operation mode can be improved.

By studying or storing refrigerating cycle characteristics of an air conditioning apparatus at the normal time and comparing them with refrigerating cycle characteristics acquired from the air conditioning apparatus at the time of operation, it becomes possible to exactly and accurately diagnose normality or abnormality of the air conditioning apparatus under any installation conditions and environmental conditions, which eliminates operations of inputting a difference between apparatus model names, a piping length, a height difference, etc at the time of apparatus installation. Accordingly, it aims at shortening the time of judging normality or abnormality, and improving the operability. It is characterized by calculating and comparing a measured value (a value of liquid phase temperature efficiency ε_L(SC/dT_c) calculated from temperature information) concerning an amount of a liquid phase part of the refrigerant in the high-pressure-side heat exchanger with a theoretical value (a value of liquid phase temperature efficiency ε_L(1−EXP(−NTU_R)) calculated from the transfer unit number NTU_R at refrigerant side).

The refrigerating system includes a low stage side refrigerant circuit (2) formed by connecting a low stage side compressor (4), a cascade condenser (5), a low stage side receiver (6), a low stage side expansion valve (7) formed of a temperature-sensitive expansion valve and an evaporator (8) in this order. The system also includes a high stage side refrigerant circuit (3) formed by connecting a high stage side compressor (9), a condenser (10), a high stage side receiver (11), a high stage side expansion valve (12) formed of a motor-operated expansion valve and the cascade condenser (5) in this order. The opening of the high stage side expansion valve (12) is adjusted so that the pressure sensed by a high-pressure sensor (SPH2) for sensing the high pressure in the low stage side refrigerant circuit (2) reaches a predetermined target high pressure.

An ejector cycle device includes a compressor that draws and compresses refrigerant, a radiator that radiates heat of high-pressure refrigerant discharged from the compressor, an ejector, a branch passage branched from a refrigerant passage between the radiator and a nozzle portion of the ejector and coupled to a suction port of the ejector, a throttle unit that is arranged in the branch passage and decompresses refrigerant, and an evaporator that is arranged on a downstream side of refrigerant flow of the throttle unit in the branch passage and evaporates refrigerant. Accordingly, even when a suction performance of the ejector is lowered, refrigerant can flow through the evaporator.

A cogeneration system is disclosed which includes a generator, a drive source for driving the generator, a waste heat supplying heat exchanger for enhancing the heating performance of a heat pump type air conditioner, an auxiliary heating heat exchanger using the waste heat of the drive source as a heat source for heating indoor air, and a regeneration heat supplying heat exchanger using the waste heat of the drive source as a heat source for regenerating a dehumidifier. The cogeneration system can use the waste heat of the drive source for diverse purposes in accordance with the indoor environment, and can have a maximal efficiency.

An air conditioner and method of detecting a refrigerant leakage in the air conditioner in which the entire refrigerant pipe of the air conditioner is sectioned based on expansion valves into a plurality of sections, the sections are checked one by one to quickly detect a refrigerant leakage from the sections and an exact position of a broken or loosened area of the refrigerant pipe causing such a refrigerant leakage is found. In the method of detecting a refrigerant leakage in the air conditioner, comprising a compressor, an expansion valve, an outdoor heat exchanger, and an indoor heat exchanger connected to one another by a refrigerant pipe, the refrigerant pipe is sectioned into a high pressure section extending from the outlet port of the compressor to the inlet port of the expansion valve, and a low pressure section extending from the outlet port of the expansion valve to the inlet port of the compressor. A pressure sensor is provided on the refrigerant pipe within the low pressure section. A control unit detects a refrigerant leakage in the low pressure section by comparing a variation in refrigerant pressure sensed by the pressure sensor with a preset variation in the refrigerant pressure in accordance with a normal operation without the refrigerant pipe having a refrigerant leakage, during a refrigerant leakage detection mode.

An air conditioner has a variable capacity rotary compressor, which allows the compressor to be smoothly re-started, thus increasing start reliability of the compressor. The air conditioner includes a compressor rotated in opposite directions. A drive unit rotates the compressor in a forward or reverse direction. A start determining unit determines whether the compressor has started to rotate in a forward direction or not. A control unit operates the drive unit so as to rotate the compressor in a direction opposite to the forward direction, and then re- start the compressor in the forward direction, when the compressor has failed to start. The air conditioner and a method of controlling the air conditioner allow the compressor to be smoothly and rapidly re-started even when the compressor has failed to re-start, thus increasing start reliability, and shortening a time required to re-start the compressor.

The invention discloses a cold and warm type frequency conversion air conditioner and a defrosting method thereof. The air conditioner comprises an indoor machine and an outdoor machine, wherein the outdoor machine is provided with a frequency conversion compressor, a four-way valve, a throttling element and an outdoor heat exchanger which are communicated through a connecting pipeline, and the connecting pipeline of the outdoor machine is also provided with a by-pass loop; and the indoor machine is internally provided with an electric heating device which is at least turned on to operate in the defrosting process of the air conditioner. The defrosting method for the air conditioner comprises that when a defrosting condition is reached, the electric heating device is turned on, and a by-pass defrosting process is carried out by the by-pass loop. The air conditioner and the defrosting method not only can guarantee the using comfort of users, but also can improve the defrosting efficiency of the air conditioner, and cannot influence the using reliability of the frequency conversion compressor of the air conditioner.

A low pressure suction side refrigerant to liquid refrigerant heat exchanger, located in the refrigeration circuit in such a way that the sensor (and external equalizer tube, if applicable) is located downstream of the low pressure refrigerant outlet of the heat exchanger, provides for effectively eliminating both the superheat and flash gas loss regions of the evaporator which in turn increases the mass flow through the evaporator and increases the refrigerating capacity of the evaporator at very little increase in compressor power thereby providing for increased system efficiency for refrigerating or cooling purposes. On the heating side, heat rejection capacity of a heat pump is increased even more dramatically because of the heat reclaim of the flash gas loss heat, which provides for even greater efficiency increases for heating applications.

A liquid circulation heating system includes a heat pump for producing a heated liquid and a heating radiator. The heat pump has a heat pump circuit for circulating a refrigerant to heat a liquid. The refrigerant contains tetrafluoropropene and difluoromethane as main components. According to the liquid circulation heating system having such a configuration, a negative impact on global warming can be reduced.

A heat pump system is operable in winter mode and/or summer mode, and may be selectively operated in a defrost mode or cycle. The system includes an energy recovery module that receives and conditions air in a regeneration air channel. A pre-processing module is positioned downstream of the energy recovery module. The pre-processing module receives and heats air from the energy recovery module. A regeneration air heat exchanger is positioned downstream of the pre-processing module. The regeneration air heat exchanger receives and conditions air from the pre-processing module. The pre-processing module heats the air from the energy recovery module to increase efficiency of the regeneration air heat exchanger. During the defrost mode, a loop of regeneration air may be recirculated between the supply air channel and the regeneration air channel in order to defrost the regeneration air heat exchanger.

The invention provides an air-conditioner defrosting control method. The air-conditioner defrosting control method comprises the following steps that when the outdoor environmental temperature is higher than 0 DEG C and lower than 5 DEG C, an air-conditioner works in a heating mode, and whether defrosting conditions are met or not is judged; if the defrosting conditions are met, the air-conditioner enters a defrosting mode, the defrosting mode is that a frequency of a compressor is controlled to be a defrosting frequency, and meanwhile, an aperture of an electronic expansion valve is controlled to be a defrosting aperture to enable the surface temperature of an outdoor heat exchanger to be kept at 0 DEG C; and the defrosting frequency is lower than the real-time operational frequency of the compressor in the heating mode, the defrosting aperture is larger than the real-time aperture of the electronic expansion valve in the heating mode, and the air-conditioner keeps operating the defrosting mode till the situation that an exit condition is met is judged. Meanwhile, an air-conditioner defrosting control device and an air-conditioner are further disclosed. According to the air-conditioner defrosting control method, switching between the heating mode and a refrigeration mode is not needed in the defrosting process, defrosting is conducted by using air heat, and the air-conditioner defrosting control method has the advantages that energy consumption is low, and user experience is good.

A heat pump heat pump system, operating with an R-410A refrigerant, comprised of at least one of an air source heat pump system, a water source heat pump system, and a direct expansion heat pump system, preferably for use in a Deep Well Direct Expansion heat pump system, which incorporates a three-mode receiver and an interior air handler, with at least one fan, with such air handler comprised of a combination of two sets of refrigerant to air heat exchange tubing/interior air heat exchange means, with by-pass lines and solenoid valves to facilitate system operation in the desired operational mode, all enabling optimum system performance in one of the desired heating mode, cooling mode, and dehumidification mode of system operation, as controlled by at least one of a thermostat/humidistat.

An inlet header (22) of a microchannel heat pump heat exchanger has a tube (34) disposed therein and extending substantially the length of the inlet header (22), with the tube (34) having a plurality of openings (36) therein. During cooling mode operation, refrigerant is caused to flow into an open end of the tube (34) and along its length to thereby flow from the plurality of openings (36) into the inlet header (22) prior to entering the microchannels (24) to thereby provide a uniform flow of two-phase refrigerant thereto. A bi-flow expansion device (41) placed at the inlet end of the tube (34) allows for the expansion of liquid refrigerant into the tube (34) during periods in which the heat exchanger operates as an evaporator and allows the refrigerant to flow directly from the header (22) and around the tube (34) during periods in which the heat exchanger operates as a condenser coil.

An heat pump drying machine has a normal dry mode (e.g., compression ratio is equal to or greater than 3) for operating a compressor at a predetermined dry operation frequency and an energy saving dry mode (e.g., compression ratio is equal to or greater than 2.3 and is less than 3) for operating the compressor at an energy saving operation frequency that is lower than the dry operation frequency. A control device is provided to control an operation frequency of the compressor 5 so that the two dry operation modes are switched to each other. The control device can execute the control for increasing the operation frequency of the compressor to the dry operation frequency during the operation of the energy saving dry mode.

A heat pump cycle system which can switches cooling operation and heating operation for a compartment includes a first inside heat exchanger and a second inside heat exchanger disposed in an air conditioning case. The first inside heat exchanger is disposed in the air conditioning case at a downstream air side of the second inside heat exchanger, while being arranged in line in a flow direction of refrigerant. The first inside heat exchanger is upstream from the second inside heat exchanger in the flow direction of refrigerant during the heating operation. In the heat pump cycle system, an expansion valve is controlled so that coefficient of performance in each operation becomes approximately maximum. Thus, during the heating operation of the heat pump cycle system, a lower limit temperature of air blown from the inside heat exchangers can be increased so that temperature of air blown into the compartment is increased, while the coefficient of performance is improved.

A heat pump system (10) includes a compressor (20), a reversing valve (30), an outdoor heat exchanger (40) and an indoor heat exchanger (50) coupled via refrigerant lines (35, 45) in a conventional refrigeration circuit, and a refrigerant-to-water heat exchanger (60). In the air cooling with water heating mode, the air heating with water heating mode and the water heating only mode, water from a water reservoir (64), such as a storage tank or swimming pool, is passed through heat exchanger (60) in heat exchange relationship with refrigerant passing through an additional refrigerant line (27) that establishes a fluid flow path through the heat exchanger (60) into the refrigerant circuit intermediate the outdoor heat exchanger (40) and indoor heat exchanger (50). A refrigerant reservoir (70) may be provided for use in refrigerant charge control.

The invention discloses an air conditioner system and an air conditioner provided with the same. The air conditioner system comprises a compressor, an indoor heat exchanger, an outdoor heat exchanger, a reversing assembly, a first throttling element, a second throttling element, a gas-liquid separator and a liquid storage device. The compressor comprises a first air cylinder, a second air cylinder, an exhaust opening and an air return opening. The exhaust volume ratio of the second air cylinder to the first air cylinder is smaller than or equal to 0.1. The reversing assembly comprises a first valve opening, a second valve opening, a third valve opening and a fourth valve opening. When the air conditioner system conducts cooling, the first valve opening is communicated with the second valve opening, and the third valve opening is communicated with the fourth valve opening. When the air conditioner system conducts heating, the first valve opening is communicated with the third valve opening, the second valve opening is communicated with the fourth valve opening, and a gas outlet of the gas-liquid separator is communicated with the second air cylinder. According to the air conditioner system, the exhaust volume ratio of the second air cylinder to the first air cylinder is made to be smaller than or equal to 0.1, so that the performance of the air conditioner system can be effectively improved, and the air conditioner can reach the optimal state of energy efficiency easily.

A refrigerating cycle apparatus is obtained that can determine excess/shortage of a refrigerant amount in a refrigerating circuit at high precision even if a factor such as a heat exchanger whose refrigerant amount is difficult to calculate exists. The refrigerating cycle apparatus according to the present invention includes one heat source unit or more, one utilization unit or more, a refrigerating circuit constituted by the heat source unit and utilization unit, a storage part which stores an appropriate refrigerant amount of a refrigerant to be charged in the refrigerating circuit and a correction coefficient which corrects a liquid refrigerant amount such that calculation of the refrigerant amount of each constituent element of the refrigerating circuit is equal to the appropriate refrigerant amount, a measurement part which detects an operation state amount in each constituent element of the refrigerating circuit, a calculation part which calculates the refrigerant amount of each constituent element of the refrigerating circuit based on the operation state amount by using the correction coefficient, a comparison part which compares the appropriate refrigerant amount with a calculative refrigerant amount calculated by the calculation part, and a determination part which determines excess/shortage of the refrigerant amount charged in the refrigerating circuit based on a comparison result of the comparison part.

A heat pump of the present invention has a compressor and an expander coupled with a common axis of rotation, a first throttling device disposed in a circulation passage of refrigerant, and a second throttling device disposed in a bypass passage diverted from the expander. A control device controls the openings of these throttling devices. The control device executes a first controlling in which the opening of the first throttling device is adjusted in order to bring a high pressure PH in a refrigeration cycle close to a predetermined value determined based on a value at which the coefficient of performance (COP) of the heat pump is optimized, and after the first controlling is completed, it executes a second controlling in which the opening of the second throttling device is adjusted in order to bring a degree of superheat SH close to a predetermined positive value. This ensures smooth and stable operations of the heat pump.

The invention provides a vapor-injected air-conditioning system, a vapor-injected air-conditioning control method and an air-conditioner, which can solve the problems of incapability of refrigerant flow adjustment, complex structure, poor refrigerating/heating effect and the like of the prior art. The technical scheme includes that the vapor-injected air-conditioning system comprises a compressor, a controller, a four-way valve, a condenser, an evaporator, a flash evaporator, an electromagnetic valve and refrigerant pipes. Two refrigerant pipe connector ends of the flash evaporator are arranged at the refrigerant pipes between the evaporator and the condenser and connected with the refrigerant pipes on the respective side, a refrigerant outlet at one end of the flash evaporator is connected with the compressor through one refrigerant pipe provided with a one-way valve and the electromagnetic valve, and an electronic expansion valve is arranged on the refrigerant pipe arranged between the condenser and the flash evaporator. A vapor-injected flow control system is simplified, cost is reduced, refrigerant flow control of the system is optimized by using the electronic expansion valve for controlling, and refrigerating and heating performances are improved.

The invention provides a heat pump type air conditioning device which comprises an air conditioning main loop, an air supply loop and a defrosting device. The air conditioning main loop comprises a compressor, a four-way reversing valve, an outdoor heat exchanger, a throttling device, a flash evaporator, an expansion device and an indoor heat exchanger all of which are sequentially connected through a refrigeration pipeline, wherein a first connector of the four-way reversing valve is communicated with the outlet end of the compressor, a second connector of the four-way reversing valve is communicated with the outdoor heat exchanger, a third connector of the four-way reversing valve is communicated with the indoor heat exchanger, and a fourth connector of the four-way reversing valve is communicated with the inlet end of the compressor. One end of the air supply loop is connected with the flash evaporator, the other end of the air supply loop is connected with the compressor, and the air supply loop comprises air supply valves which are connected through a pipeline. The defrosting device is used for carrying out defrosting on the outdoor heat exchanger, and is a refrigerant heating device which is connected to the air conditioning main loop in series. According to the heat pump type air conditioning device, defrosting can be carried out under the condition that the compressor does not need to be stopped, defrosting is timely, and the structure is simple.

A vehicle air conditioner includes a first heat exchanger, wherein air around the first heat exchanger is supplied into a vehicle compartment, a heat storage unit, an in-vehicle circuit that connects between the first heat exchanger and the heat storage unit, a second heat exchanger, wherein air around the second heat exchanger is sent outside a vehicle, a vehicle system, wherein the vehicle system generates exhaust heat, an out-vehicle circuit, a connection circuit that connects between the in-vehicle and the out-vehicle circuits, a plurality of valves operating so that the in-vehicle circuit and the out-vehicle circuit are connected or disconnected from each other through the connection circuit and a control device for controlling states of the valves.