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.

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 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.