487results about How to "Improve defrosting effect" patented technology

The invention discloses a method for air conditioner defrosting, which comprises the following steps, first, a pipeline is added between an air discharge pipe of a compressor and an air inlet pipe of a condensator in advance, and a magnetic valve is arranged on the pipeline, second, the temperature of a coil pipe of the condensator and temperature of outdoor environment are detected, third, a defrosting operation is judged to be operated or not according to the temperature of the coil pipe of the condensator and the outdoor environment, if the defrosting operation is needed, the fourth step is executed, otherwise the second step is executed, fourth, the magnetic valve is controlled to open, the frequency of the compressor is controlled to reduce to a first predetermined value, a four-way change-over valve is controlled to change into a refrigerating operation, fifth, the compressor is controlled to make an indoor set convert up to a second predetermined value according to the first predetermined speed, sixth, the temperature of the condensator is judged to detect whether the temperature is satisfied for a condition of the defrosting withdrawal, if satisfied, the seventh step is operated, otherwise, the fifth step is operated, seventh, the magnetic valve is closed, the compressor is controlled to convert down to a third predetermined value according to the second predetermined speed, and the four-way change-over valve is controlled to change to a heat-producing operation. The invention provides a method for air conditioner defrosting, which solves the problem that the period of defrosting for an air conditioner is longer, and defrosting effect of the air conditioner is influenced.

The invention discloses an air-conditioner defroster. The defroster comprises a compressor, a four-way valve, an evaporator and a condenser. The defroster also comprises a first pipeline for connecting a liquid inlet of the evaporator with a liquid outlet of the condenser; a second pipeline for connecting an air return inlet of the evaporator with a first port of the four-way valve; a third pipeline for connecting an air inlet of the condenser with a second port of the four-way valve; a fourth pipeline for connecting an air outlet of the compressor with a third port of the four-way valve; a fifth pipeline for connecting a suction inlet of the compressor with a fourth port of the four-way valve; a bypass pipeline with one end communicated with the first pipeline and the other end communicated with the fourth pipeline; a bypass control valve arranged on the bypass pipeline for starting / closing the bypass pipeline; a throttle valve arranged on the first pipeline for regulating the flow of refrigerant in the first pipeline through adjusting the openness of the throttle valve. The invention combines the advantages of heat pump defrosting and hot gas bypass defrosting and can achieve the most effective defrosting.

The invention discloses a heat pump type vehicle air conditioner having a battery heat management function, which comprises a main refrigerant circulating loop configured to allow a refrigerant to flow in a sequence from a compressor, through a vehicle outside heat exchanger and an expansion valve, to a vehicle inside heat exchanger, or configured to allow the refrigerant to flow in a sequence from the compressor, through the vehicle inside the exchanger and the expansion valve, to the vehicle outside exchanger; and a defrosting loop configured to allow the refrigerant compressed by the compressor to sequentially flow through a defrosting throttle valve, the vehicle outside heat exchanger and a gas-liquid separator and then back into the compressor. The heat pump type vehicle air conditioner having the battery heat management function, provided by the invention, has a good defrosting effect with short defrosting time and low inside-vehicle temperature fluctuation, and can provide favorable comfort.

The invention discloses an air conditioner defrosting method and device, wherein the air conditioner defrosting method comprises the following steps of obtaining the time of one defrosting process; determining a first time interval between one defrosting process and a next defrosting process according to the obtained time; carrying out the next defrosting process when the first time interval is up. According to the air conditioner defrosting method and device disclosed by the invention, the problem that the poor defrosting effect of an air conditioner easily occurs in the correlation technique is solved, and the defrosting effect and the user experience are improved.

The invention discloses a defrosting method of a multi-combination type air conditioning unit. The defrosting method comprises that starting operation is carried out, temperature T0 of a frosted side of a coil pipe of an outdoor heat exchanger (1) of each outdoor machine is measured, when T0 of a certain outdoor machine is judged to be lower than -12 degrees, an air conditioning main controller sends a defrosting command to start to defrost the outer machine, reversing direction is carried out on a four-way reversing valve (2) and rotation of an outdoor fan is stopped at the same time, the outer fan is operated in an inverted mode, when a defrosting temperature sensor of the outdoor machine for carrying out defrosting detects temperature of a defrosting side of the coil pipe of the outdoor heat exchanger (1) of the outdoor machine to be larger than or equal to 12 degrees, defrosting is finished, after frequency of an inverter compressor (3) of the outdoor machine is reduced to reversing frequency, the frequency is kept being operated for 10 seconds, then the four-way reversing valve (2) is reversed in direction, and the whole air conditioning unit is switched back to be operated in a heating mode. The defrosting method is short in defrosting time, high in defrosting efficiency and rapid in defrosting speed.

The invention discloses an air energy water heater, which comprises a main controller, a compressor and an external environment temperature sensor, wherein the compressor and the external environment temperature sensor are electrically connected with the main controller through leads. The defrosting method mainly comprises the following steps: in the normal heating process, continuously monitoring outdoor environment temperature through the external environment temperature sensor; if the outdoor environment temperature is lower than the defrosting starting temperature, accumulating the running time of the compressor; when the accumulated running time of the compressor reaches the defrosting starting time, starting a defrosting program; and finishing defrosting when the external environment temperature is higher than the defrosting finishing temperature or the defrosting time exceeds the maximum defrosting time, thereby determining whether the defrosting program needs to be started or not by comparing the defrosting starting temperature with the temperature transferred by the external environment temperature sensor to avoid cold shock and thermal shock of external environment to the sensor and ensure the normal use of a sensor chip, so that normal and real judgment of the system can be ensured to enable the defrosting effect to be better.

The invention relates to an air conditioning device and a control method thereof. The air conditioning device comprises a compressor, a four-way valve, an indoor heat exchanger, a sleeve pipe heat exchanger, an expansion valve and an outdoor heat exchanger. The control method comprises the steps that when the air conditioning device carries out heating operation till the outdoor heat exchanger needs to be defrosted, whether the outdoor environment temperature is within the range of a preset temperature interval or not is judged, and if yes, a down-flow defrosting mode is started; in the down-flow defrosting mode, the state of the four-way valve is kept unchanged, the expansion valve is promoted to be totally opened, whether the temperature of a coil pipe of the indoor heat exchanger is larger than or equal to a first preset temperature or not is judged, and if yes, an indoor fan is started; and if no, the indoor fan is stopped, the coil pipe of the indoor heat exchanger is heated, andafter the temperature of the coil pipe of the indoor heat exchanger reaches or exceeds the first preset temperature, the indoor fan is started. The technical problem that in the existing defrosting process, the indoor temperature fluctuation is large, and consequently comfort is poor is avoided; the defrosting time is shortened; noise is reduced; and operation stability is improved.

The invention discloses a heat pump air-conditioning defrosting control method and a heat pump air-conditioning system. The control method at least comprises the following steps: a detecting module detects an inner-side wind pressure value and an outer-side wind pressure value of an outdoor heat exchanger respectively, and transmits the detected inner-side wind pressure value and the detected outer-side wind pressure value to a control device; and the control device calculates a wind pressure difference value of the inner and outer sides of the outdoor heat exchanger, and carries out defrosting control according to the wind pressure value. According to the heat pump air-conditioning defrosting control method, the detecting module is arranged on the outdoor heat exchanger, the existence of a frost layer on the outdoor heat exchanger can be effectively detected, and the accuracy for detecting a defrosting signal of the heat pump air-conditioning system is greatly improved, so that the heat pump air-conditioning defrosting effect is better; an absolute value of the wind pressure difference value of the two sides of the outdoor heat exchanger is compared with a preset defrosting value or a preset cancelling value, and the heat pump air-conditioning system is controlled to carry out defrosting or cancel defrosting, so that the defrosting accuracy is high and the defrosting effect is good.

A refrigeration apparatus uses a refrigerant that operates in a supercritical range. The refrigeration apparatus includes a compression mechanism, a heat source-side heat exchanger, an expansion mechanism, a usage-side heat exchanger, a switching mechanism, an intercooler, a bypass tube, and an injection tube. The switching mechanism is configured to switch between cooling and heating operation states. When the switching mechanism is switched to the cooling operation state to allow refrigerant to flow to the heat source-side heat exchanger and a reverse cycle defrosting operation for defrosting the heat source-side heat exchanger is performed, the refrigerant is caused to flow to the heat source-side heat exchanger, the intercooler and the injection tube. After the defrosting of the intercooler is detected as being complete, the bypass tube is used so as to ensure that the refrigerant does not flow to the intercooler and the injection valve is controlled so that the opening degree is increased.

The invention discloses a multi-connected multi-functional heat pump type electric air-conditioning system and a working method thereof. The air-conditioning system comprises an electric compressor, an out-of-vehicle heat exchanger, a vapor-liquid separator, an in-vehicle heat exchanger, a battery cooler, a vehicle-mounted storage battery, a battery cooler water pump, an electronic expansion valve, an electromagnetic valve, a water tank, a low-temperature cooler water pump, two-position three-way valves, a low-temperature cooler, an out-of-vehicle heat exchanger fan and an in-vehicle heat exchanger fan. According to the air-conditioning system, the year-round operating work condition of an electric vehicle can be well dealt, the in-vehicle heat exchanger and the battery cooler can serve as an evaporator and a condenser according to the needs of the operating work condition, the out-of-vehicle heat exchanger can decide to serve as the evaporator or the condenser in an automatically-matched mode according to the heat load, and heating or cooling of a battery can also be met while the in-vehicle refrigerating or heating requirements are met.

Multi-type air conditioner comprising an outdoor unit installed in an outdoor, comprising a compressor, a refrigerant flow controlling part connected to a discharge end of the compressor for guiding the refrigerant proper to operation conditions selectively, an outdoor heat exchanger connected to the refrigerant flow controlling part, a defrosting device at a side of the outdoor heat exchanger, and a piping system connected between the parts, a plurality of indoor units each installed in a room and having an indoor heat exchanger and an electronic expansion valve having one end connected to one end of the indoor heat exchanger, and a distributor between the outdoor unit and the indoor units for selectively guiding refrigerant from the outdoor unit to the plurality of indoor units proper to operation conditions, and guiding the refrigerant passed through the indoor units to the outdoor unit again.

A defroster for evaporator of electric refrigerator is characterized by that the circulating pipe whose entrance and exit are connected to mechanical chamber passes through the heat exchanger with evaporator in it and its entrance has an exhaust fan. Its advantage is use of the heat generated in mechanical chamber to remove frost.

The invention provides a controlling method for defrosting of an air conditioner. The air conditioner has a heating mode and a defrosting mode started after a preset triggering condition is met when the air conditioner is operated in the heating mode. The controlling method comprises the steps that when the air conditioner is operated in the heating mode, the coil temperature of an indoor heat exchanger is continuously detected; when the preset triggering condition is met, an air conditioner self-heating mode is switched to the defrosting mode, and time of switching the heating mode in this time to the defrosting mode of the air conditioner is calculated, and the time is called the heating mode time Sy; when the air conditioner finishes defrosting, the time of running the defrosting mode of the air conditioner in this time is obtained, and the time is called the defrosting mode time Sc; and the dynamic triggering condition for entering in the defrosting mode of the air conditioner for the next time is determined according to the coil temperature, the heating mode time Sy and the defrosting mode time Sc. The controlling method for defrosting of the air conditioner can adjust the triggering condition for entering the defrosting mode for the next time so that the air conditioner can defrost at the most suitable time, and the defrosting effect is optimum.

An air conditioning apparatus includes a defrosting flow channel mechanism. The air conditioning apparatus performs an air-warming defrost operation in which refrigerant sent from an indoor heat exchanger to an outdoor heat exchanger is evaporated while defrosting an arbitrarily selected heat exchange path using the defrosting flow channel mechanism. In the defrost operation, the refrigerant sent to the outdoor heat exchanger from the indoor heat exchanger is not channeled into the refrigerant flow diverter but is passed through the arbitrarily selected heat exchange path from the gas-side end to the liquid-side end of the arbitrarily selected heat exchange path, and the refrigerant passed through the arbitrarily selected heat exchange path flows through the refrigerant flow diverter to be passed through other heat exchange paths other than the arbitrarily selected heat exchange path from the liquid-side end to the gas-side end of the other heat exchange paths.

The invention provides an operation control method, a control device, an air conditioner and a computer readable storage medium. The operation control method comprises the steps of that the air conditioner runs in a heating mode, and according to the obtained working condition parameters, whether the heating mode is switched to a defrosting mode or an electric auxiliary heating assembly is startedin the heating mode can be determined; and in the defrosting mode, a four-way valve is controlled to maintain unchanged conduction direction, and a control valve between an indoor heat exchanger andan outdoor heat exchanger is controlled to open, thus allowing a corresponding bypass pipeline to be communicated. According to the technical scheme, under the phrase that the frosting risk is detected but the defrosting condition is not reached, the heating effect of the air conditioner is reduced due to the limitation of frosting, so that the electric auxiliary heating assembly can be started toimprove the heating effect under the working condition with existing frosting risk, thus improving the air outlet temperature of an indoor unit and the room heating effect.

The invention discloses a defrosting control method for an air-conditioner. The defrosting control method comprises the steps that the temperature of a heat exchange tube in an outdoor heat exchanger during heating operation starting of the air-conditioner is acquired and set as an initial temperature; when air-conditioner heating operates for a first preset time, the temperature value of the heat exchange tube in the outdoor heat exchanger is acquired in real time and set as a comparing temperature; whether the air-conditioner meets a preset defrosting condition or not is judged according to the comparing temperature; and when the air-conditioner meets the preset defrosting condition, the air-conditioner is controlled to be in a defrosting mode, and the time duration of the first preset time is regulated according to the initial temperature and the comparing temperature at which the preset defrosting condition is met. The invention further discloses a defrosting control device of the air-conditioner. The defrosting control method and device achieve the purpose of controlling the air-conditioner to start defrosting according to the frosting degree of the outdoor heat exchanger of the air-conditioner, and improve the defrosting effect of the air-conditioner.

The invention relates to the technical field of air conditioners, in particular to a defrosting control method for an air conditioner. The method aims to solve the problem that in an existing defrosting mode, the judgment of the frosting thickness of an outdoor heat exchanger is not accurate and accordingly an air conditioner cannot be effectively defrosted. Therefore, the air conditioner comprises an outdoor heat exchanger. The defrosting control method comprises the following steps that under the condition that the air conditioner runs in a heating mode, the surface temperature of the outdoor heat exchanger is obtained; the air inlet moisture content and the air outlet moisture content of the outdoor heat exchanger are obtained; the frosting thickness of the outdoor heat exchanger is determined on the basis of the air inlet moisture content and the air outlet moisture content; whether the air conditioner enters a defrosting mode or not is judged according to the surface temperature and the frosting thickness. The frosting thickness of the outdoor heat exchanger is determined on the basis of the air inlet moisture content and the air outlet moisture content, and whether the outdoor heat exchanger needs to be defrosted or not is judged according to the surface temperature of the outdoor heat exchanger so that whether the air conditioner enters the defrosting mode or not can bejudged accurately.

The invention relates to a hot wastewater waste-heat recovery type heat pump hot-water system by utilizing waste heat of domestic and industrial hot wastewater, which comprises a wastewater recycle pool, a hot water tank, a filter, a water source circulating water pump, a water source heat pump, a make-up water pipe, a heat preservation water tank, a hybrid resource heat pump, a circulating water pump, a make-up water resource heat pump, a wastewater heat exchanger, and a hot wastewater circulating water pump, wherein three groups of modular units, namely the water source heat pump, the make-up water resource heat pump and the hybrid resource heat pump can be cooperated to run, also can be used independently and have flexible combination and convenient operation. An outdoor heat exchanger and a second heat exchanger of the hybrid resource heat pump can utilize thermal energy of air and the hot wastewater respectively; and when the defrosting is performed, the outdoor heat exchanger is taken as a condenser, and the second heat exchanger utilizes the hot wastewater as a heat source and is taken as an evaporator, the system has good defrosting effect and does not influence hot water temperature. The heat pump hot-water system utilizes the waste heat in a step way, fully recovers the waste heat, and has energy conservation and consumption reduction after the hot wastewater is collected.

Disclosed therein are a heat pump system for a vehicle, which determines that frosting begins on an exterior heat exchanger 130 and carries out a defrosting control if a difference value between outdoor temperature and refrigerant temperature of an outlet side of the exterior heat exchanger is above a frosting decision temperature in a heat pump mode, thereby increasing frost-prevention and defrosting effects and enhancing heating performance and stability of the system because the system recognizes the beginning of frosting on the exterior heat exchanger 130 at a proper time so as to carry out the defrosting control.

Defroster ducts (12R, 12L) includes a right defroster duct (12R) extending from a left side of a temperature control unit (11) toward a right side of a front window (FW) and a left defroster duct (12L) extending from a right side of the temperature control unit (11) toward a left side of the front window (FW). The right and left defroster ducts (12R, 12L) are arranged crossing each other.

The invention provides an air conditioner system which comprises a first four-way reversing valve and a second four-way reversing valve. The first four-way reversing valve comprises a D1 port, an E1 port, an S1 port and a C1 port, wherein the D1 port is communicated with an outlet of a compressor, the E1 port is communicated with a first port of a phase change heat accumulator, the S1 port is communicated with an inlet of a gas-liquid separator, and the C1 port is communicated with a first port of an outdoor heat exchanger. The second four-way reversing valve comprises a D2 port, an E2 port, an S2 port and a C2 port, wherein the D2 port is communicated with the outlet of the compressor, the E2 port is communicated with a first port of an indoor unit, and the S2 port is communicated with the inlet of the gas-liquid separator. An outlet of the gas-liquid separator is communicated with an inlet of the compressor. A second port of the phase change heat accumulator is in serial connection with a defrosting electronic expansion valve and is communicated with a second port of the indoor unit, and a second port of the outdoor heat exchanger is connected between the defrosting electronic expansion valve and the second port of the indoor unit. The air conditioner system can improve heating and defrosting effects.

The invention relates to a defrosting technology of a dehumidifier, in particular to a defrosting method of a low-temperature dehumidifier which stops a compressor and increases the wind volume of a fan. The defrosting method can solve the problems that a direction changing valve is currently used for changing the direction of a circulating refrigerant for defrosting, while the direction changing valve is expensive and easily damaged. The technical proposal is as follows: the compressor is started and the fan is operated under the set wind volume, then the dehumidification is operated for a period of time and the temperature of an exhaust pipe of the evaporator is simultaneously judged, if the temperature thereof is higher than the defrosting inrush temperature, the dehumidification is continuously carried out, and if the temperature is not higher than the defrosting inrush temperature, the compressor is closed, the wind volume of the fan is increased, and the defrosting is started; the temperature of the exhaust pipe of the evaporator is simultaneously judged, when the temperature is higher than the defrosting release temperature, the dehumidification state is returned, if the temperature is still not higher than the defrosting release temperature, the defrosting is continuously carried out till the temperature is higher than the defrosting release temperature under the situations that the compressor is closed and the wind volume of the fan is increased, and then the dehumidification state is returned. The defrosting method reduces the cost of the dehumidifier and save the electricity charge due to the elimination of the direction changing valve.

The invention provides a heat pump type hot water supply apparatus, comprising a cascade circulation unit, comprising: a cascade circulation heat exchanger making a first coolant of a low temperature refrigeration circulation perform heat exchange with a second coolant of a high temperature refrigeration circulation, the water coolant heat exchanger heating water during condensation of the secondcoolant of the high temperature refrigeration circulation is connected with a position requiring heat supply and a water circulating path. The heat pump type hot water supply apparatus comprises a coolant injection path and a gaseous coolant adjustment valve. The coolant injection path may be split between a cascade heat exchanger and an evaporator of a low temperature refrigeration cycle to inject coolant into a low pressure side compressor, or between a water coolant heat exchanger and a cascade heat exchanger to inject coolant into a high pressure side compressor of a high temperature refrigeration cycle. The gaseous coolant adjustment valve may be provided in the coolant injection path and is adjusted to correspond to a load of a destination. Via the above structure, high temperature water can be effectively supplied to places requiring hot water supply, reduction of heating efficiency due to outdoor low temperature in cold zones can also be effectively prevented.

The invention relates to an air conditioning plant and a control method thereof. The air conditioning plant comprises a compressor, an indoor heat exchanger, a first throttling device and an outdoor heat exchanger, which are connected in order so as to form a refrigerant main loop, wherein the compressor is used for compressing and exhausting a sucked refrigerant, and the indoor heat exchanger is used for enabling the refrigerant to exchange heat with indoor air; the first throttling device is used for throttling the refrigerant flowing out from the indoor heat exchanger and reducing pressure of the refrigerant, and the outdoor heat exchanger is used for enabling the refrigerant to exchange heat with outdoor air; the outdoor heat exchanger is provided with a first flowing path and a second flowing path, and the first flowing path and the second flowing path are used for enabling the refrigerant to flow past and are in parallel. The air conditioning plant further comprises a by-pass pipeline, and the by-pass pipeline is used for selectively enabling part of the refrigerant exhausted by the compressor to pass through in a branch mode to directly flow into the second flowing path, so that the heat of the part of the refrigerant is utilized to defrost the outdoor heat exchanger. The air conditioning plant realizes the defrosting and heating at the same time and improves the comfortable experience.

The invention relates to a refrigerator defrosting control method and system. The method comprises the steps that a refrigerator is controlled to run; whether a defrosting starting condition is met or not is judged, the refrigerator is kept running at the original state if the defrosting starting condition is not met, and whether a compressor runs or not is judged if the defrosting starting condition is met; if the compressor runs, refrigeration temperature is obtained in real time, whether the refrigeration temperature is smaller than or equal to Tft-a DEG C or not is judged, Tft is a refrigeration shutdown point, and a is a constant; if the refrigeration temperature is smaller than or equal to Tft-a DEG C, a fan is controlled to stop running, a defrosting heater is started, and the refrigerator enters in a defrosting mode; if the compressor does not run, the fan is directly controlled to stop running, the defrosting heater is started, and the refrigerator enters in the defrosting mode; whether a defrosting finishing condition is met or not continues to be judged, the defrosting mode is kept if the defrosting finishing condition is not met, and the defrosting mode quits if the defrosting finishing condition is met. The influence of rise of the refrigeration temperature on the refrigeration effect in the defrosting process is effectively reduced, it is guaranteed that food in a freezing chamber is below target temperature, and refrigeration quality is guaranteed.

The invention relates to an air conditioning unit defrosting controlling method and device and an air conditioner. The defrosting controlling method comprises the following steps that when a compressor completes starting or exits from a defrosting mode, a counter is reset and timing starts; when the time counted by a timer reaches a first preset time, defrosting influence parameters are obtained; when the defrosting influence parameters conform to a preset defrosting condition, the compressor is controlled to enter into the defrosting mode; and the compressor is controlled to exit from the defrosting mode after defrosting is finished. According to the air conditioning unit defrosting controlling method and device and the air conditioner, the defrosting influence parameters are detected and the preset defrosting condition is set reasonably, and a defrosting step is executed when the defrosting influence parameters meet the preset defrosting condition, so that effective intelligent defrosting is achieved, a good defrosting effect is realized, and a unit can be protected to achieve reliable operation.

A heat exchanger includes a refrigerant tube through which a refrigerant for absorbing heat from air flows, and a defrosting medium tube through which a coolant for supplying heat for defrosting flows. Two fins disposed on both sides of the refrigerant tube include a protrusion protruding toward an upstream side of the flow of air with respect to the refrigerant tube. The protrusion is provided with a clearance that allows melt water generated in the defrosting to flow on the upstream side of the refrigerant tube. The refrigerant tubes and the defrosting medium tubes can be alternately arranged in the upstream line. The protrusion protrudes such that the air can be introduced into an air passage from the side portion of the protrusion even when an end facing the upstream side of the flow of the air is closed with the core of frost.

The invention discloses a heat-pump-type air conditioning system which comprises an indoor heat exchanger, an outdoor heat exchanger, a first pipeline, an expansion valve, a compressor, a four-way valve, a heat storage loop and a hot-gas bypass loop. The first pipeline connects the indoor heat exchanger with the outdoor heat exchanger, the expansion valve is serially connected on the first pipeline, the compressor is used for compressing refrigerant steam, the four-way valve is connected with an input end and an output end of the compressor and connected with the indoor heat exchanger and the outdoor heat exchanger, one end of the heat storage loop is connected between the expansion valve on the first pipeline and the outdoor heat exchanger, a first two-way valve and a heat accumulator wrapped on the outer wall of the compressor are serially connected on the heat storage loop, the other end of the heat storage loop is connected with an input end of the compressor, one end of the hot-gas bypass loop is connected between the output end of the compressor and the indoor heat exchanger while the other end of the same is connected with the outdoor heat exchanger, and a second two-way valve and a throttling device are serially connected on the hot-gas bypass loop. By the heat-pump-type air conditioning system, temperature difference between a refrigerant flowing into the heat accumulator and the heat accumulator is increased, and defrosting effect is effectively improved. The invention further provides a sensible-heat defrosting method and a heat-storage defrosting method.

An ejector type refrigeration cycle, comprising a first evaporator (15) for evaporating refrigerant flowing out from an ejector (14), a branch passage (17) for bifurcating a refrigerant flow between a radiator (13) and the ejector (14) and introducing the refrigerant flow to a gas phase refrigerant suction opening (14c) of the ejector (14), a restriction mechanism (18) provided in the branch passage (17), and a second evaporator (19) installed on the more downstream side of the refrigerant flow than the restriction mechanism (18). The restriction mechanism (18) is provided with a function for fully opening the branch passage (17) at the time of defrosting the second evaporator (19). In the ejector type refrigeration cycle comprising a plurality of evaporators, a defrost function of the evaporator can be realized through the simple construction.