67results about How to "Improve heat pump efficiency" patented technology

A first bypass pipe has one end connected to a main pipe extending from a compressor to an indoor heat exchanger, and its other end branched off into parts that are each connected to the main pipe on an inlet side of an outdoor heat exchanger, and a second bypass pipe has one end connected to an injection port communicating with the compression chamber of the compressor in which compression is taking place and its other end branched off into parts that are each connected to the main pipe on an outlet side of the outdoor heat exchangers. During a defrosting operation that removes frost on the outdoor heat exchangers, a part of the refrigerant discharged from the compressor is supplied from the first bypass pipe to the outdoor heat exchanger to be defrosted, and is then passed through the second bypass pipe and injected from the injection port of the compressor.

A loop type heat pipe includes an evaporator located to evaporate a refrigerant by heat-exchanging with a first fluid as a heat source, and a condenser located to liquefy and condense the evaporated vapor refrigerant by heat-exchanging with a second fluid to be heated. The condenser has a refrigerant condensation side on which the condensed liquid refrigerant flows, and a refrigerant un-condensation side on which the vapor refrigerant before being condensed flows. In addition, the loop type heat pipe is provided with a flow limitation portion for flowing the second fluid from the refrigerant condensation side toward the refrigerant un-condensation side. For example, the loop type heat pipe is suitably used for a waste heat recovery device.

The invention relates to a heat recovery solution dehumidifying fresh air handling unit, which is characterized by comprising a solution circulating system, a heat pump system and an evaporative cooling water system, wherein the solution circulating system comprises a two-stage total heat recovery module, a dehumidifying module and a regeneration module; the two-stage total heat recovery module is connected with a solution circulating pump to form a total heat recovery unit; the dehumidifying module is connected with the regeneration module to form an inter-stage solution circulation loop; the heat pump system comprises a heat pump circulation loop, which is comprised of a compressor, a first condenser, a throttle valve, an evaporator and a second condenser; the heat exchange end of the second condenser is connected with the corresponding regeneration module through the solution circulating pump to form a solution heating loop; the heat exchange end of the evaporator is connected with the corresponding dehumidifying module through the solution circulating pump to form a solution cooling loop; and the evaporative cooling water system comprises a water heating loop formed by communicating an evaporative cooling module with the heat exchange end of the first condenser through a water circulating pump. The heat recovery solution dehumidifying fresh air handling unit can be widely applied on occasions where dry fresh air is needed to be supplied.

A system for increasing efficiency of a closed-earth-loop heat pump system; for increasing heat pump efficiency by feeding relatively colder water to heat pumps when they operate in a cooling mode; and, in certain aspects, systems for using excess produced heat and/or waste heat generated by an air conditioning system that employs an earth loop heat exchange apparatus, the system having power production apparatus that uses the excess produced heat and/or waste heat from air conditioning apparatus to generate electricity and reduce the heat dissipation load on the earth loop heat exchange apparatus; and, in one aspect, such a system that provides cooling fluid to a fuel cell that produces water and electricity.

The indoor air source heat pump water heater is a kind of hot water supplier with air as heat source. The present invention has evaporator installed in the air inlet of the air exchanging fan to exhaust air outdoor and contacting closely to the air exchanging fan; compressor, throttle unit and drying filter installed below water reservoir and connected to the lower opening of the condensator inside the water reservoir. The present invention has the advantages of stable heat pump work state, easy regulation of the throttle unit, high efficiency of the heat pump, no frosting in the evaporator, compact structure, small volume, low noise, etc.

The invention relates to a solar energy heat tube heat pump unit and a method for accomplishing the same. The pump unit comprises an evaporation heat collecting device which can absorb the radiant heat of solar energy or the quantity of heat of other heat sources such as the waste heat and is a system evaporator and is a compressor, a throttling gear, a condenser, a system connecting pipe, a vapor phase bypass valve and a liquid phase bypass valve as well. The invention is characterized in that when the device works in a mode of heat tube, the liquid working substance inside a pipe of the heat collecting device is evaporated into steam by the radiate heat of the sun or the quantity of heat of other mediums, the steam working substance enters into the water inside a heating water tank of the condenser and condenses to liquid which returns to the evaporation heat collecting device again by the push of gravity. Therefore, the water is heated circularly. The invention works in a mode of heat pump when the heat collecting device as the evaporator is at low temperature and pressure. Therefore, the solar energy or the heat energy in other mediums can be absorbed and the medium to be heated inside the condenser is heated. The energy consumption of the heating device is 25 percent of that of the electric water heater.

The invention provides a solar auxiliary air source heat pump device capable of realizing multimode operation. The system comprises a refrigerant circulation loop, a solar heat source loop and a solar cold-hot water loop. Solar energy is organically combined with an air source heat pump to solve the stability problem of solar auxiliary air source heat pump, realize high efficiency utilization of solar energy, simultaneously realize improvement of solar energy on performance of a heat pump system, and develop the solar auxiliary air source heat pump device capable of realizing multimode operation.

A combined fluid-air evaporator having at least two separate duct systems is described, through which separate material flows may be conducted, at least one of the two duct systems having a free surface which may be brought into thermal contact with an air flow, and the at least two duct systems being at least partially in thermal contact with one another. Furthermore, a ventilation arrangement for a building is described using the combined fluid-air evaporator, in which a used air flow directed out of the building, which is in thermal contact with an outside air flow via an air-air heat exchanger, comes into thermal contact with the combined fluid-air evaporator, through which a refrigerant and an exothermic fluid pass, the refrigerant circulating in the loop of a heat pump, whose condenser is connected downstream in the flow direction from the air-air heat exchanger in the heated outside air flow, and the exothermic fluid circulates in the loop of a heat accumulator system.

The present development is a building air cooling system using cool ground water, e.g. well water. Building air is cooled by coming into direct contact with cool ground water in a compact chamber using PVC packing for maximizing heat transfer efficiency, conserving space and reducing the required ground water pumping power consumption without requiring expensive compression and expansion cycles of the traditional air conditioning systems. If additional cooling is desirable, a second stage traditional air conditioning or heat pump system may also be used.

A cooling and heating system with a first heat exchange loop and a second heat exchange loop. The first heat exchange loop uses a first heat transfer fluid that is passed through a compression/evaporation refrigeration cycle to cool a refrigerated space and to collect waste heat, and then pumps that heat transfer fluid to a remote heat pump in the winter where the waste heat is used to provide warm air. The first heat exchange system may also pump some or all of the first heat transfer fluid to a remote water heater where the waste heat is used to heat water. The heat transfer fluid is then passed through an underground portion where it is cooled to about 55°. The second heat exchange loop uses a second heat transfer fluid to cool the heat pump in the summer, and may pump that second heat transfer fluid to a remote water heater where waste heat is used to heat water. The first earth loop and the second earth loop may be interconnected so that a single heat transfer fluid is used in both loops, or they may be operated so that the heat transfer fluid flowing in the first loop is isolated from the heat transfer fluid flowing through the second loop.

Methods and system for managing lubricant within a vapor compression heat pump are presented. In one example, lubricant may be flushed from selected areas of a heat pump to other areas of the heat pump where lubricant is desired. The lubricant may be flushed in full flushing mode or in a partial flushing mode.

The invention discloses an efficient direct-heating type stair coupling heat pump water heater. The efficient direct-heating type stair coupling heat pump water heater comprises an evaporator, a firstcompressor, an intermediate heat exchanger, a first throttling valve, a first water pump, a water storage tank, a second water pump and a second compressor. An outlet of the evaporator is connected with an air suction opening of the first compressor, an exhaust opening of the first compressor is connected with a first inlet of the intermediate heat exchanger, a first outlet of the intermediate heat exchanger is connected with an inlet of the first throttling valve, and an outlet of the first throttling valve is connected with an inlet of the evaporator. An outlet of the first water pump is connected with a first inlet of the water storage tank, a first outlet of the water storage tank is connected with a second inlet of the intermediate heat exchanger, a second outlet of the intermediateheat exchanger is connected with an inlet of the second water pump, an outlet of the second water pump is connected with a second inlet of the water storage tank, and a third outlet of the water storage tank is a moderate-temperature hot water outlet. The efficient direct-heating type stair coupling heat pump water heater has the advantages that the efficiency is high, the loads of the compressorsare light in the low-temperature environment, and the service life is prolonged.

This refrigerant compressor (110) comprises an airtight container (8), a compression mechanism (3) accommodated in the airtight container (8) and used for drawing in and compressing refrigerant, an electric motor (9) accommodated in the airtight container (8) and used for driving the compression mechanism (3), and an oil storage part (50) formed in the bottom part of the airtight container (8) and used for storing lubricating oil; the interior of the airtight container (8) being an atmosphere of refrigerant intake pressure, and the interior of the airtight shell being provided with a heat exchange means for heating using high-pressure refrigerant immediately after the lubricating oil stored in the oil storage part (50) has been discharged from the compression mechanism (3).

The invention discloses a device with convertible two-stage supercharging and single-stage parallel connection of a carbon dioxide refrigerant, and belongs to the technical field of heat pumps. The device with convertible two-stage supercharging and single-stage parallel connection of the carbon dioxide refrigerant comprises a carbon dioxide compressor, carbon dioxide gas cooling, a throttling device (an electronic expansion valve), an air-cooled evaporator, a gas-liquid separator, a cold water make-up pump, a suction shut-off valve, a suction and exhaust short-circuit valve and an exhaust shut-off valve. Through the opening and closing of the suction shut-off valve, the suction and exhaust short-circuit valve and the exhaust shut-off valve, the carbon dioxide compressor is switched in a two-stage supercharging state or a single-stage parallel connection state; a refrigerant system can be automatically switched in the single-stage state or the two-stage state, the energy efficiency ofthe system is the highest, and the automatic switching of the single-stage state and the two-stage state enables the whole device to be adapt to a wider range of ambient temperature, the device can beapplied to the ambient temperature of -30 DEG C-43 DEG C.