31results about How to "Increase unit cooling capacity" patented technology

The invention provides a flow-way-changeable heat pump air conditioner heat exchanger. The heat exchanger comprises an air collecting opening (1), a liquid collecting opening (2) and three heat exchanging flow ways arranged between the air collecting opening (1) and the liquid collecting opening (2). The three heat exchanging flow ways are connected with one another in parallel. The heat exchanger further comprises a control valve system which controls at least one flow way of the three heat exchanging flow ways to be connected or disconnected so as to achieve switching among the different flow ways. According to the flow-way-changeable heat pump air conditioner heat exchanger, switching of the heat exchanger flow ways in different operation conditions of a unit can be effectively achieved, so that the heat exchanging coefficient is increased and consequentially the heat exchanging effect is improved. The invention further relates to a control method of the air conditioner heat exchanger.

An air conditioning refrigerating device comprises a high back pressure rotary compressor; an outlet of the high back pressure rotary compressor is connected with an inlet of a condenser; an outlet of the condenser is connected with a liquid inlet of a heat regenerator; the liquid outlet of the heat regenerator is connected with an inlet of a swelling valve; an outlet of the swelling valve is connected with an inlet of an evaporator; an outlet of the evaporator is connected with an air inlet of the heat regenerator; an air outlet of the heat regenerator is connected with an inlet of the high back pressure rotary compressor. According to the air conditioner refrigerating device, refrigerant firstly enters into the high back pressure rotary compressor, enters into the compressor after being compressed into high temperature high pressure air, then is condensed into intermediate temperature high temperature liquid and discharges heat to the air; the refrigerant then flows through the heat regenerator to enter into the swelling valve to be throttled to be in a low temperature low pressure air-liquid mixed state; then the refrigerant enters into the evaporator to change heat with the air in the environment to enable the air temperature to be reduced; accordingly the refrigerating effect is achieved. The air conditioner refrigerating device has the advantages of improving the compressor efficiency and a refrigeration coefficient of a refrigeration system and being good in lubricating oil return.

The invention relates to a method for preparing liquid by low-temperature rectification. The method comprises the steps that 1, raw material air passes through an air compressor, an air pre-cooling system and an air purification system; 2, the purified air enters the heat exchanger continuously, and air in the heat exchanger is divided into two strands, the first strand of air passes through the heat exchanger to be condensed into liquid to enter a rectifying lower tower, the second strand of air is pumped out and then enters a low-temperature expansion machine for expansion, part of the air enters the rectifying lower tower, and the other part of the air is returned to the air compressor inlet or the air pre-cooling system after being subjected to repeated thermal expansion by the heat exchanger; 3, liquefied air after throttling which flows into the lower tower and the expanded part of air into the rectifying lower tower for rectification, so as to obtain a liquid nitrogen product;and rectifying is carried out again through a rectifying upper tower to obtain the liquid oxygen product. According to the method, the exhaust pressure of the circulating air compressor is effectivelyreduced, the unit refrigerating capacity of the expansion machine is improved, and the purposes of enabling the equipment to be easy to operate and reducing the primary investment of the equipment are achieved.

The invention belongs to the field of air separation and discloses an air separation technique. The problem of low purity of oxygen produced through an existing air separation technique is solved. The technique includes the steps that (1) air is filtered and enters an air compressor to be compressed, and the compressed air is cooled and washed in a cooling tower; (2) part of purified air is cooled to a dew point and then enters the bottom of a lower tower, the other part of purified air flows into a booster compressor to be pressurized, the pressurized air is divided into two ways, one way of air is subjected to expansion cooling and delivered into an upper tower, and the other way of air passes through a heat exchanger and flows into the lower tower; (3) the air is subjected to preliminary rectification in the lower tower, liquid air passes through a supercooler and then enters the upper tower, part of liquid oxygen is delivered into a storage system, and the other part of liquid oxygen is reheated and then enters an oxygen pipe network; and (4) argon distillate is extracted from the middle of the upper tower and delivered into a crude argon column, and pure nitrogen extracted from the top of the upper tower of a rectifying tower passes through the supercooler, then enters the heat exchanger and is delivered into a water-cooling tower and a user pipe network. By means of the air separation technique, the purity of produced oxygen reaches 99.8%.

The invention discloses a jet type supercooling refrigeration system, and aims at providing a refrigeration system capable of obtaining a large degree of supercooling and low operation cost. The jet type supercooling refrigeration system comprises a main refrigeration cycle and a jet subcooling refrigeration cycle; the cooling heat of the high temperature gas of the compressor exhaust port in themain refrigeration cycle drives an injector in the jet subcooling refrigeration cycle. The refrigeration system can obtain a large degree of subcooling, and the high-pressure refrigerant liquid in a generator is heated by the cooling heat of the high-temperature gas of the compressor exhaust port, so that the jet supercooling cycle can use the waste heat effectively; without other energy input, the operation cost is reduced. Meanwhile, the refrigerant entering a main condenser has a lower temperature, the space occupied by the condenser is reduced, the cooling process is more sufficient, the energy efficiency of the system is improved effectively; and the service life of the compressor is prolonged.

The invention relates to an energy saving type CO2 double-machine double-level refrigeration multi-split air conditioner system. A subcritical compressor, a mixing barrel, a transcritical compressor,a gas storage tank, an intermediate cooler and a heat regenerator are included. The subcritical compressor is connected with the bottom of the mixing barrel through a first gas cooler. The top of themixing barrel is connected with the transcritical compressor. The transcritical compressor is connected with a second gas cooler through an oil separator. The second gas cooler is connected with the gas storage tank. The gas storage tank is connected with two gas inlet pipes of the intermediate cooler through a drying filter. The intermediate cooler is connected with a plurality of air coolers through the heat regenerator. After being connected in parallel, air outlet pipes of the air coolers are connected with the heat regenerator, and the heat regenerator is connected with a gas inlet pipe of the subcritical compressor. The multi-split air conditioner system is combined with the CO2 double-machine double-level refrigeration technology to be applied to the medium-low-temperature field, the double-mode refrigeration principle energy saving design characteristic is adopted, and for the industry field of medium-low temperature environment bins and medium-low temperature refrigeration houses and cold chains, future market application prospects are very wide.

The invention relates to a heat pump drying system with deep supercooling capable of being used in the drying field of various materials. The system comprises a plurality of independent heat pump units, a subcooler unit, a fan and a central controller, wherein each of the heat pump units comprises a compressor, a condenser, a liquid storage device, a drying filter, an expansion valve and an evaporator. The heat pump unit which is relatively high in condensing temperature or relatively small in supercooling degree in the heat pump drying system with deep supercooling is provided with a subcooler, and a liquid refrigerant out of the condenser is cooled by means of dehumidified low-temperature air, so that the supercooling degree is improved greatly and the refrigerating capacity is improvedgreatly. When the plurality of subcoolers are adopted, the subcoolers can be connected in parallel or in series on the air side. In the system, drying air is successively cooled and dehumidified stageby stage by the evaporators and is then reheated by means of the condensers, so that the air is cooled and heated gradiently, and the heat pump drying system has the advantages of being small in heattransfer temperature difference, energy-saving and efficient.

The invention discloses a CO2 refrigeration piston compressor with a turbine expansion mechanism. The CO2 refrigeration piston compressor comprises an expansion unit and a compression unit, wherein the expansion unit comprises an expansion shell, a gas channel and an acting assembly, the acting assembly comprises a transmission part and a rotating part, and the rotating part is arranged in the expansion shell and connected with the transmission part; and the compression unit comprises a motor, a connecting rod, a piston and an air cylinder. According to the CO2 refrigeration piston compressor, the acting assembly is coaxially connected with the motor, and normal-temperature high-pressure CO2 gas expands in the expansion shell to act outwards, so that power consumption of the motor is saved; and meanwhile, the dryness of the high-pressure CO2 in the fluid state after isentropic expansion is smaller than that of the high-pressure CO2 in the fluid state after adiabatic throttling, and therefore the unit refrigerating capacity is improved; According to a system applying the CO2 refrigeration piston compressor, the motor power in the working process of the compressor is reduced, the refrigerating capacity of the system is increased, and therefore the operation energy efficiency of the system is improved.

The invention relates to a solution desorption refrigeration cycle device, which is characterized in that: it has a low-pressure generator, which has a outlet via channel connected to the inlet, and a inlet via channel connected to the throat valve and the heat exchanger, while another outlet via channel is connected to the inlet of heat exchanger and another two interfaces via channels connected to the inlet and outlet of low-temperature heat base; one inlet of adsorbed via channel is connected to the outlet of compressor, while another outlet is connected to the solution pump; another two interfaces of adsorbed via channel is connected to the inlet and outlet of high-temperature heat base. The invention uses solution to generate desorption in low-temperature to generate the refrigerator, which can attain higher unit refrigerator than steam compress refrigeration cycle device, with improved refrigeration factor.