34results about How to "Extended defrost cycle" patented technology

The heat pump system is composed of compressor, condenser, throttling element, and evaporator connected in sequence through pipes. Coil pipe is wound on compressor, and two ends of coil pipe are connected to loop of evaporator. Advantages are: recovering quantity of heat released to environment by compressor before the invention; recovered quantity of heat is provided to evaporator to raise vapor pressure and to improve superheat degree of return-air of compressor in condition of low temperature. Test shows that in -5 deg.C of ambient temperature, thermal efficiency is raised 30%, and heating capacity is raised 35%. Since coil pipe is connected to loop of evaporator, thus, temperature of evaporator is higher than ambient temperature. The ambient temperature can be lowered than-5 deg.C when evaporator runs without frost. Or frost occurs defrosting cycle can be prolonged so as to raise efficiency of producing heat.

A refrigerator comprises a frost resisting apparatus (1) used for communicating the interior with the exterior of the refrigerator. The frost resisting apparatus (1) comprises a dehumidification tube (10), and a dehumidification agent is filled in the dehumidification tube (10). The refrigerator is further provided with a water-proof gas-permeable membrane, the water-proof gas-permeable membrane being close to an inner side of a refrigerator body. An external opening is disposed on a back of a refrigerator case (3) of the refrigerator, and an internal opening is disposed on a refrigerator opening (2) of the refrigerator. One of the dehumidification tube (10) is connected to the external opening, and the other end is connected to the internal opening. A refrigerator case connector (30) with an air hole is disposed on the external opening, and a refrigerator opening connector (20) with an air hole is disposed in the internal opening. The dehumidification tube (10) is connected to the refrigerator opening connector (20) through a soft pipe (40). The refrigerator can effectively reduce frosting quantity in the refrigerator body, extend the defrosting cycle for a user, and reduce energy consumption.

Refrigerants containing HCFC's are replaced with new blends by using R-236fa and R-125, or R-125 with R-245fa, or R-236ea, or R-134a with R-236fa in place of HCFC's. No hardware or oil composition changes are required to maintain temperatures, pressures and capacity substantially unchanged in a refrigeration system.

The present invention provides a control device and a control method for a cooling room, which can keep the temperature inside the room constant by performing constant control of the temperature inside the room by PID control during constant temperature cooling, and can prevent the growth of frost in the evaporator, which can reduce the need for cooling. The frequency of defrosting and extending the defrosting cycle time. In the internal temperature constant control, the heat supply process of opening the expansion valve for a predetermined heat supply time to enter the heat supply state and the heat shutoff process of closing the expansion valve for a predetermined heat shutoff time are alternately repeated. .

The invention relates to a large-capacity multigang air-conditioner / heat pump unit, which belongs to the technical field of refrigerating air conditioner. The large-capacity multigang air-conditioner / heat pump unit comprises an outdoor unit basic unit, a plurality of outdoor unit expansion units and a plurality of independent indoor unit units, and is characterized in that various outdoor unit expansion units are formed by compressors and evaporator / condensers; compressors of the outdoor unit basic unit are connected with the compressors of the various outdoor unit expansion units through return gas pipes, oil balance pipes and exhaust pipes; evaporator / condensers of the outdoor unit basic unit are connected with the evaporator / condensers of the various outdoor unit expansion units through gas collectors and liquid collectors; and liquid connecting pipes and gas connecting pipes of the outdoor unit basic unit are correspondingly connected with liquid connecting pipes and gas connecting pipes of various indoor unit units, so as to form a vapor compression refrigeration / heating cycle. The comprehensive performance coefficients IPLV(C) and IPLV(H) of the large-capacity multigang air-conditioner / heat pump unit can be improved; the operation reliability of the unit can be improved; and the equipment cost can be reduced.

The invention discloses a device for removing siloxane in biomass gas, which includes a refrigeration cycle unit, a refrigerant cycle unit and a biomass gas siloxane removal unit; a cold storage tank is provided for cold storage of the refrigerant, and two The heat exchanger for removing siloxane works alternately, and the incoming biomass gas is precooled by the refrigerant after heat exchange with the biomass gas and the biomass gas after removing siloxane. The invention can adapt to different working conditions, and is suitable for removing siloxane gases in biomass gas in actual operation, so as to ensure efficient application of biomass gas.

The present application provides a heat pump air conditioning system and a control method thereof. The system includes a compressor, a four-way valve, an indoor heat exchanger, first and second throttling devices, a main heat exchanger, and a defrost heat exchanger, which is located on the air flow upstream side of the main heat exchanger , the second throttling device is connected in series with the defrosting heat exchanger to form a defrosting pipeline. In the heating condition, the refrigerant flows from the exhaust port of the compressor through the indoor heat exchanger, the first throttling device and the main heat exchanger. After throttling through the second throttling device, it enters the defrosting heat exchanger after being throttled by the second throttling device, and then flows back to the compressor; At least one of the frost pipelines is provided with a refrigerant heating device. According to the heat pump air-conditioning system of the present application, the frequency of frosting of the main outdoor heat exchanger can be reduced, and the heat input to the refrigerant of the whole system can be enhanced, so as to prolong the heating time and continuously supply heat to the room during the defrosting period.

The invention discloses a heat pump system, which comprises a compressor (1), a hot water heat exchanger (2), a throttling device (3) and an outdoor heat exchanger (4) sequentially arranged in a refrigerant circulation circuit. The water tank (7) and the circulating water pump (8) are arranged in sequence. The system also includes a heat exchanger (10), a refrigerant bypass pipe (11) and a hot water bypass pipe (12). The heat exchanger absorbs the running waste heat of the compressor and heats it. The circulation medium in the refrigerant and water bypass pipes. The inlet port of the refrigerant bypass pipe is switched and connected to the outlet port of the throttling device through the refrigerant reversing valve (5). The outlet port of the refrigerant bypass pipe is connected to the inlet port of the outdoor heat exchanger. The inlet end of the water bypass connecting pipe is switched and connected to the outlet end of the circulating water pump through the hot water reversing valve (6), and the outlet end of the hot water bypass connecting pipe is connected to the inlet end of the hot water heat exchanger. The heat pump system of the invention can utilize the running waste heat of the compressor to defrost and preheat hot water, and more fully utilize the running waste heat of the compressor.

The invention belongs to the refrigeration field of refrigeration houses, and discloses a frostless heat exchange system for a refrigeration house. The system comprises a fan, a heat exchanger, a moisture absorption assembly, a windward port and an air supply opening, wherein the windward port is connected with the refrigeration house to be treated, so that return air in the refrigeration house tobe treated enters the heat exchange system from the windward port; the fan rotates so as to enable the return air in the refrigeration house to be treated to enter the heat exchange system from the windward port; the moisture absorption assembly is arranged on the windward port, and is used for dehumidifying and drying the return air entered from the windward port, so that the dew point temperature of the dehumidified return air is lower than the temperature of the surface of the heat exchanger, and the surface of the heat exchanger is prevented from frosting; the heat exchanger is used for cooling the return air dehumidified through the moisture absorption assembly; and the air supply opening is connected with the refrigeration house to be treated, and is used for returning the return air treated by the heat exchanger into the refrigeration house to be treated. Through the frostless heat exchange system for the refrigeration house provided by the invention, the defrosting cycle is greatly prolonged, the heat exchanger is prevented from frosting, and the problems brought by defrosting are solved.

The invention provides a method for reducing frost of a chamber. The method includes the step that water vapor in the refrigerator chamber is guided out of the refrigerator chamber in one direction, in other words, the water vapor is only allowed to be transmitted out of the refrigerator chamber. The frost amount in the refrigerator chamber is reduced, and the frost removing cycle is prolonged.

The invention discloses a cold accumulation type device for removing siloxane in biomass gas. The device comprises a refrigeration circulating unit, a secondary refrigerant circulating unit and a biomass gas siloxane removing unit; a cold accumulation tank is arranged for cold accumulation of a secondary refrigerant; three heat exchangers for removing siloxane work alternately to pre-cool the coming biomass gas of which the siloxane is removed. The device disclosed by the invention is adaptive to different work conditions and is suitable for removing siloxane type gases in the biomass gas during actual operation so as to guarantee high-efficiency application of the biomass gas.

The present application provides a heat pump air conditioning system and a control method thereof. The system includes a compressor, a four-way valve, an indoor heat exchanger, first and second throttling devices, a main heat exchanger, and a defrost heat exchanger, which is located on the air flow upstream side of the main heat exchanger , the second throttling device is connected in series with the defrosting heat exchanger to form a defrosting pipeline. In the heating condition, the refrigerant flows from the exhaust port of the compressor through the indoor heat exchanger, the first throttling device and the main heat exchanger. After throttling through the second throttling device, it enters the defrosting heat exchanger after being throttled by the second throttling device, and then flows back to the compressor; At least one of the frost pipelines is provided with a refrigerant heating device. According to the heat pump air-conditioning system of the present application, the frequency of frosting of the main outdoor heat exchanger can be reduced, and the heat input to the refrigerant of the whole system can be enhanced, so as to prolong the heating time and continuously supply heat to the room during the defrosting period.

The invention provides a refrigerator. The refrigerator comprises a refrigerator body and a cooler. At least one storage room and an air channel are arranged in the refrigerator body. The cooler is arranged in the air channel, so that the cooler and air flowing through the cooler carry out heat exchange. Specially, the air channel is configured to allow part or all of air from the interior of one or more storage rooms in the storage rooms to flow around the cooler and be mixed with air flowing through the cooler at the downstream position of the cooler. Due to the special structure of the air channel, the refrigerator enables part of air for circulation not to be cooled by the cooler, the air is mixed with the air flowing through the cooler at the downstream position of the cooler so that refrigeration temperature can be achieved, and moisture in air which is not cooled by the cooler can continue to return to the corresponding storage rooms. Therefore, moisture in a refrigeration room can be prevented from being lost or being lost too fast in the refrigeration process, air humidity of the refrigeration room is guaranteed, and food freshness retaining is facilitated.

The present invention discloses one kind of parallel cooling refrigerator and belongs to the field of cooling-air circulating technology for refrigerator. The refrigerator includes freezing chamber, cold storage chamber installed parallelly to the freezing chamber, partition board to separate the freezing chamber and the cold storage chamber, evaporator to form cooling circulation, separating board to separate the heat exchange space of the evaporator into two parts, freezing chamber cold air passage to feed partial cold air into the freezing chamber, cold storage chamber cold air passage to feed other cold air into the cold storage chamber, and blower for the forced circulation of cold air. The present invention has raised cooling effect, saving in power, raised cold storage chamber cooling speed and maximized cold storage chamber volume.