68results about How to "Efficient defrosting" patented technology

On an upper surface of a container body, there are disposed at least a base portion of a concentration meter configured to detect the concentration of a liquid reducing agent based on a heat transmission characteristic between two spaced points, and a heat exchanger configured to permit the engine coolant to circulate therein and arranged to surround a detecting section of the concentration meter, which hangs from the base portion of the concentration meter via a supporting column thereof, to thereby perform the heat exchange with the liquid reducing agent, and also, a protector or an encasing element of substantially box shape is arranged to surround a lower portion of the heat exchanger and the detecting section of the concentration meter, and further, a visor is attached on the supporting column of the concentration meter, which is positioned above the protector by a predetermined interval.

The invention discloses an automatic defrosting control method for a frost free refrigerator. The method comprises a step of: intelligently judging a defrosting pointcut, namely testing evaporation temperature, refrigerating chamber temperature, environment temperature and real-time running state of the refrigerator, judging the attenuation degree of the heat exchange capacity of an evaporator ofthe refrigerator according to a set algorithm of the control method, and further judging the defrosting pointcut to automatically control the defrosting process. By the method, defrosting cut accuracy and exit timeliness are realized, the energy efficiency level and refreshing quality of the refrigerator are improved, and the intelligent control level of the refrigerator is improved.

An air conditioner for a vehicle is provided with: a compressor that compresses a heat exchange medium; an external heat exchanger that receives the heat exchange medium and that exchanges heat with the outside of a vehicle compartment; and an evaporator that receives the heat exchange medium and exchanges heat with the inside of a vehicle compartment, and the air conditioner for a vehicle is able to perform: a defrosting cooling operation in which the heat exchange medium that has been compressed by the compressor is made to flow into the evaporator and absorb heat, and to then flow into the external heat exchanger and release heat; and a hot gas operation in which the heat exchange medium that has been compressed by the compressor is made to flow into the external heat exchanger and release heat without being made to absorb heat in the evaporator, and, by switching between performing the defrosting cooling operation and performing the hot gas operation, the air conditioner for a vehicle performs a defrosting operation in which the external heat exchanger is defrosted.

An air-conditioning apparatus divides an outdoor heat exchanger to form parallel heat exchangers and supplies part of refrigerant from a compressor to the parallel heat exchangers alternately to perform defrosting, performs medium-pressure defrosting in which part of the refrigerant from the compressor is decompressed and supplied to a parallel heat exchanger to be subjected to defrosting, and the refrigerant after being used for defrosting is injected into the compressor. A first flow switching unit performs switching of a connection mode of ends of the parallel heat exchangers on compressor side, where the pressure changes among high pressure, medium pressure, and low pressure according to operation contents, to one of three modes: a mode with the ends connected to the compressor discharge side, a mode with the ends connected to the compressor suction side, and a mode with the ends connected to neither the discharge nor suction side.

An outdoor unit (A) that constitutes a refrigeration circuit by being connected by piping to indoor units (B, C) comprises: a compressor (1) that compresses and discharges a refrigerant; a plurality of parallel heat exchangers (50) that perform heat exchange between air and the refrigerant; a first defrost pipe (15) that forms a channel to perform defrosting by diverting a portion of the refrigerant discharged by the compressor (1) making the same flow to the parallel heat exchanger (50) to be defrosted; a first throttling device (10) that depressurizes the refrigerant that passes through the first defrost pipe (15); a second throttling device (7) that regulates the pressure of the refrigerant that passes through the parallel heat exchanger (50) to be defrosted; and a controlling device (30) that controls the second throttling device (7) so that the pressure of the refrigerant passing through the parallel heat exchanger (50) to be defrosted is within a predetermined range and that determines when defrosting is complete on the basis of the degree of supercooling of the refrigerant.

An outdoor unit, connected with indoor units by pipes to constitute a refrigerant circuit, includes a compressor configured to compress and discharge refrigerant, a plurality of parallel heat exchangers configured to allow heat exchange between air and the refrigerant, a first defrosting pipe serving as a flow path for branching a part of the refrigerant discharged by the compressor and allowing the refrigerant to flow into the parallel heat exchanger to be defrosted for defrosting, a first expansion device configured to decompress the refrigerant passing through the first defrosting pipe, a second expansion device configured to adjust the pressure of the refrigerant that passed through the parallel heat exchanger to be defrosted, and a controller configured to control the second expansion device such that the pressure of the refrigerant that passed through the parallel heat exchanger to be defrosted falls within a predetermined range.

The invention discloses a constant temperature flow control method for a heat pump water heater and a double-system unit using the same, relates to a fluid heater utilizing a heat pump and a control method thereof, and particularly relates to a constant temperature flow control method for the heat pump water heater and a double-system primary heating type heat pump water heater unit using the method. The double-system primary heating type hot pump water heater unit comprises a heat pump system A, a heat pump system B, a water supply heating system C and a constant temperature flow control device, wherein PID regulation on water flow is performed according to outlet water temperature; an outlet water temperature set value is set as a target value, and the opening of a constant temperature flow valve is controlled according to a checking value of the outlet water temperature so as to adjust the water flow; when the temperature of a water box is low, a constant temperature water pump and a compressor are started, and the unit operates at constant temperature; when inlet water temperature is too high, a bypass-valve is opened; and one system in a double-system generates a fault and stops operation, the outlet water set temperature is down-adjusted, the water flow of a heat pump unit is guaranteed, and the condensation effect and heating capacity and energy efficiency of the unit are improved, so that the other system without the fault is safely and stably operated in an efficient manner.

A heat pump defrost system for efficiently defrosting an outdoor coil while simultaneously operating the heat pump in a normal heating manner. The heat pump defrost system generally includes a primary flow circuit including an indoor heat exchanger, an outdoor heat exchanger, a compressor connected thereto and a reverse valve for toggling a direction of refrigerant flow therethrough, and an auxiliary flow circuit for deicing the outdoor heat exchanger. The auxiliary flow circuit includes a valve for connecting the auxiliary flow circuit to the primary flow circuit, a heat sink in line with the auxiliary flow circuit, wherein the heat sink stores defrost fluid within the auxiliary flow circuit, at least one thermostat to read an outdoor ambient temperature and a control unit for operatively engaging the valve to direct the hot gas from the compressor of the primary circuit within the auxiliary flow circuit and the heat pump according to the outdoor ambient temperature for deicing the outdoor heat exchanger.

A refrigerant circuit (20) includes a low stage compressor (101, 102, 121, 122), a high stage compressor (41, 42, 43), an outdoor heat exchanger (44) and a utilization side heat exchanger (83, 93). During a defrosting operation of the refrigeration system (10), the high stage compressor (41, 42, 43) is driven. Refrigerant discharged from the high stage compressor (41, 42, 43) is pumped into the utilization side heat exchanger (83, 93) to heat frost on it from its inside. Thereafter, the refrigerant evaporates in the outdoor heat exchanger (44), is then compressed by the high stage compressor (41, 42, 43) and is sent again to the utilization side heat exchanger (83, 93).

The invention provides an air conditioner, a defrosting method and a computer readable storage medium. The air conditioner comprises an indoor heat exchanger, a gas-liquid separator, a compressor andan outdoor heat exchanger which communicate annularly, and further comprises a gas supplementation defrosting bypass, the first end of the gas supplementation defrosting bypass is connected to a gas supplementation opening of the compressor, and the second end of the gas supplementation defrosting bypass is connected to an inlet of the gas-liquid separator; and when the air conditioner is in the heating mode, a defrosting refrigerant can flow into the gas supplementation defrosting bypass through an exhaust opening of the compressor and continue flowing towards the outdoor heat exchanger for defrosting operation. Through the technical scheme, on the premise that mode switching of the air conditioner is reduced, defrosting operation is conducted in time, the operation reliability of the airconditioner is improved, the service life of the air conditioner is prolonged, and accordingly, the using experience of a user is improved.

A heat pump apparatus that having a refrigerating cycle including a compressor, a gas cooler, a pressure reducing device and an evaporator and is designed so that water can be heated by the gas cooler. A refrigerant such as CO2 or the like working in a supercritical area is filled and used at a high-pressure side in the refrigerating cycle and a radiator is equipped between the exit of the gas cooler and the pressure reducing device. The refrigerant temperature at the exit of the radiator is kept at a substantially fixed temperature irrespective of the temperature of hot water to the gas cooler.

The invention provides an air conditioner, a defrosting method and a computer readable storage medium. The air conditioner comprises an indoor heat exchanger, a compressor, an outdoor heat exchanger and a defrosting branch, wherein the indoor heat exchanger, the compressor and the outdoor heat exchanger annularly communicate with one other; the defrosting branch is connected with the indoor heat exchanger in parallel; and when the air conditioner is operated in a heating mode, a defrosting coolant can flow into the defrosting branch through an exhaust port of the compressor and continues to flow into the outdoor heat exchanger for defrosting operation. Through the technical scheme, on the premise that air conditioner mode switching is reduced, the defrosting operation is conducted in time,the operation reliability of the air conditioner is improved, the service life of the air conditioner is prolonged, and thus the user experience is improved.

Provided is a heat-pump-type vehicle air conditioning system that passes hot gas to both a vehicle-cabin-exterior condenser and a vehicle-cabin-exterior vaporizer during a defrosting operation, and that, even during times of low outside air temperature, can efficiently defrost in a short period of time and can use the cooling cycle of an existing system as-is. In the heat-pump-type vehicle air conditioning system (1): a vehicle-cabin-interior condenser (8) disposed downstream of a vehicle-cabin-interior vaporizer (7) within an HVAC unit (2) is connected, with refrigerant switching means (16) therebetween, to a cycle (23) for cooling comprising an electric compressor (15), a vehicle-cabin-exterior condenser (17), a first decompression unit (19) with on-off valve function, the vehicle-cabin-interior vaporizer (7), and an accumulator (21); a vehicle-cabin-exterior vaporizer (27) disposed at the outside of the vehicle cabin is connected, with a second decompression unit (26) with on-off valve function therebetween, to the exit-side liquid refrigerant pipe (22B) of the vehicle-cabin-exterior condenser (17); and furthermore a bypass circuit (32) having a third decompression unit (30) with on-off function is connected between the accumulator (21) and the exit exit-side liquid refrigerant pipe (22B) of the vehicle-cabin-exterior condenser (17).

A heat-pump-type vehicular air-conditioning that includes a cooling refrigerant circuit. The circuit has a base for connecting an onboard condenser provided on the downstream side of an onboard evaporator inside an HVAC unit. The circuit includes a second decompression unit between the outlet side of a receiver and one end side of a vehicle-mounted external heat exchanger. Also included is a second circuit having a solenoid valve opened during heating between the other end side of the vehicle-mounted external heat exchanger and the intake circuit of an electric compressor. The vehicular air-conditioning system being provided with a heating refrigerant circuit in which the electric compressor, a switching unit, the onboard condenser, the receiver, the first circuit, the vehicle-mounted external heat exchanger, and the second circuit are connected in the stated order.

The present invention provides a technique for rapidly removing frost accumulated in air-refrigerant cooling apparatuses. An air-refrigerant cooling apparatus in accordance with the present invention includes a bypass line for directly supplying a defroster with refrigerant air having an increased temperature from a compressor, avoiding temperature drop by a heat exchanger and an expansion turbine. Moisture of the frost melted in the defroster is externally exhausted by a fan.

The present disclosure discloses a defrosting device, including a heating unit provided at a lower side of an evaporator, and configured to heat working fluid therein; and a plurality of heat pipes, both end portions of which are connected to an inlet and an outlet of the heating unit, respectively, and at least part of which are disposed adjacent to a cooling tube of the evaporator to emit heat to the cooling tube due to high temperature working fluid heated and transferred by the heating unit, wherein the plurality of heat pipes are configured with a first heat pipe and a second heat pipe disposed to form two rows on a front portion and a rear portion of the evaporator, respectively, and the first heat pipe and the second heat pipe are formed in different lengths.

The invention discloses a thermostatic flow regulating device of a single-heating type heat-pump water heating unit and a control method of the thermostatic flow regulating device, relates to a control device for utilizing a fluid heater of a heat pump, in particular to a thermostatic flow regulating device for a dual-system single-heating type heat-pump water heating unit and a control method of the thermostatic flow regulating device. The thermostatic flow regulating device comprises a single chip microcomputer control unit, a temperature-sensing element, a switching signal element and a control signal output driving unit. The single chip microcomputer control unit is connected to a compressor, a water inlet electromagnetic valve, a thermostatic flow valve, a by-pass valve and a thermostatic water pump of the dual-system single-heating type heat-pump water heating unit through the control signal output driving unit. An outlet temperature set value is taken as a target value, opening of the thermostatic flow valve is controlled according to an outlet water temperature measured value, and water flow is regulated; when water tank temperature is low, the unit runs thermostatically; when inlet water temperature is over-high, the by-pass valve is turned on; when one of dual systems is faulted to stop running, outlet water set temperature is lowered so as to guarantee the other non-fault system to be capable of running efficiently, safely and stably.

A heat reclaim refrigeration system uses a first compressor to elevate the amount of latent heat reclaimable by the system and to reclaim this heat using heat reclaim means, such as heat reclaim coils, for practical applications, such as heating a building. In addition, the system reduces pressure required from a second compressor used for refrigeration, and energy consumed thereby, especially during cold periods of the year when a refrigerant condensing means has lower condensing requirements.

The invention discloses a cold accumulation type hot air defrosting refrigerating system and a heat accumulation type hot air defrosting heat pump system. The refrigerating system comprises a refrigerating loop. The refrigerating loop is at least formed by sequential communicating of a compressor, a condenser, a throttling device and an evaporator in series. A defrosting loop for defrosting of the evaporator and a cold accumulation evaporator are further arranged. The defrosting loop is at least formed by sequential communicating of the compressor, the evaporator, the throttling device and the cold accumulation evaporator in series. The refrigerating system can achieve stable, rapid and thorough defrosting, meanwhile, the cooling capacity obtained during defrosting can be recycled, the total running efficiency of the system is improved accordingly, and energy consumption is reduced.

A heat exchanger door system includes a heat exchanger and a first rotatable member, proximate to the heat exchanger, that rotates about an axis of rotation. The system includes a first door member rolled around the rotatable member and movable from a rolled position to an unrolled position in which the first door member covers more of the heat exchanger than when the door member is in the rolled position.

The invention relates to an air-cooled type refrigerator with a heat pipe type heat storage and frost removal mechanism. The air-cooled type refrigerator comprises a refrigerator body, a condenser, an evaporator, a fan, a water receiving tray, a water drain pipe, more than one gravity assisted heat pipe and an annular heat pipe, wherein a heat storage chamber is formed in the refrigerator body between the condenser and the evaporator and is filled with a phase change heat storage material; a gravity assisted heat pipe evaporation section of each of the more than one gravity assisted heat pipe is inserted in a condenser coil of the condenser, a condensation section of each of the more than one gravity assisted heat pipe extends into the heat storage chamber and is wrapped with the phase change heat storage material; an evaporation section of the annular heat pipe is located in the heat storage chamber, one part of a condensation section of the annular heat pipe is attached to the evaporator and used for removing frost on the evaporator of the refrigerator, and the other part is attached to the water receiving tray and used for heating the water receiving tray. According to the air-cooled type refrigerator, waste heat released by the condenser is stored by the phase change heat storage material and used for efficiently removing frost on the evaporator of the air-cooled refrigerator, so that the energy consumption of the refrigerator is effectively reduced.

A heat reclaim refrigeration system uses a first compressor to elevate the amount of latent heat reclaimable by the system and to reclaim this heat using heat reclaim means, such as heat reclaim coils, for practical applications, such as heating a building. In addition, the system reduces pressure required from a second compressor used for refrigeration, and energy consumed thereby, especially during cold periods of the year when a refrigerant condensing means has lower condensing requirements.

The invention relates to a defrosting device and belongs to the technical field of low-temperature defrosting. The defrosting device is installed in an ultralow-temperature storage box. The defrosting device comprises a hydrophobic layer, a plurality of ultrasonic transducers arranged in an arrayed mode, a program control system and an ultrasonic generator. The ultralow-temperature storage box comprises a box body inner plate. The side, facing a storage space, of the box body inner plate is coated with the hydrophobic layer, and the ultrasonic transducers generating supersonic vibration are installed on the other side of the box body inner body. The multiple ultrasonic transducers are connected into the program control system in parallel, and the program control system is connected with the ultrasonic generator. The invention further relates to the ultralow-temperature storage box provided with the defrosting device and the defrosting method of the ultralow-temperature storage box. According to the defrosting device, the ultralow-temperature storage box and the defrosting method thereof, frost of the inner plate can be effectively removed, heat-exchange heat resistance between a box body and copper pipes attached to a wall is reduced, and a low-temperature working condition in the box body is maintained; and while the start-stop ratio and energy consumption of a unit are reduced, reliability of the unit is improved, the service life of the unit is prolonged.

An air conditioner for a vehicle is provided with: a compressor that compresses a heat exchange medium; an external heat exchanger that receives the heat exchange medium and that exchanges heat with the outside of a vehicle compartment; and an evaporator that receives the heat exchange medium and exchanges heat with the inside of a vehicle compartment, and the air conditioner for a vehicle is able to perform: a defrosting cooling operation in which the heat exchange medium that has been compressed by the compressor is made to flow into the evaporator and absorb heat, and to then flow into the external heat exchanger and release heat; and a hot gas operation in which the heat exchange medium that has been compressed by the compressor is made to flow into the external heat exchanger and release heat without being made to absorb heat in the evaporator, and, by switching between performing the defrosting cooling operation and performing the hot gas operation, the air conditioner for a vehicle performs a defrosting operation in which the external heat exchanger is defrosted.

The invention discloses an automatic defrosting control method for a frost free refrigerator. The method comprises a step of: intelligently judging a defrosting pointcut, namely testing evaporation temperature, refrigerating chamber temperature, environment temperature and real-time running state of the refrigerator, judging the attenuation degree of the heat exchange capacity of an evaporator ofthe refrigerator according to a set algorithm of the control method, and further judging the defrosting pointcut to automatically control the defrosting process. By the method, defrosting cut accuracy and exit timeliness are realized, the energy efficiency level and refreshing quality of the refrigerator are improved, and the intelligent control level of the refrigerator is improved.

A refrigerator including a main body including a storeroom; an evaporator arranged in the back of the storeroom and configured to generate cold air; a defrost heater arranged under the evaporator into which air flows and configured to remove frost or ice formed on the evaporator; a temperature sensor arranged on the top of the evaporator and configured to measure temperature; and a controller configured to stop operation of the defrost heater in a first defrost cycle based on a first measurement measured by the temperature sensor and stop operation of the defrost heater in a second defrost cycle based on a second measurement, which is different from the first measurement.

An air-conditioning apparatus is capable of performing a heating-defrosting operation where a specific one of a plurality of parallel heat exchangers is a heat exchanger to be defrosted and serves as a condenser while at least one parallel heat exchanger other than the heat exchanger to be defrosted serves as an evaporator. The air-conditioning apparatus includes a liquid refrigerant transporting unit for transferring liquid refrigerant from an accumulator to the heat exchanger to be defrosted. To perform the heating-defrosting operation, the air-conditioning apparatus supplies, to the heat exchanger to be defrosted, the liquid refrigerant transferred by the liquid refrigerant transporting unit.