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.

In a heat-pump water heater, a control unit has a heat-radiation determining means for determining a heat radiation from refrigerant to outside air in an air heat exchanger based on a water temperature flowing into a water heat exchanger, and the control unit selectively performs a general cycle operation and a bypass operation in accordance with a determination result of the heat-radiation determining means. That is, when the water temperature flowing into the water heat exchanger is lower than 60° C., the general cycle operation is performed. On the other hand, when the water temperature is equal to or higher than 60° C., the bypass operation is performed.

A refrigerant heat pump system is operable in both heating and cooling modes. A reheat circuit is integrated into the system schematic to provide improved control over temperature and humidity and to cover a wide spectrum of sensible and latent capacity demands. In the heating mode, the reheat coil is utilized to act as a portion of the enlarged indoor heat exchanger (a condenser in this case), in order to enhance system efficiency without the capacity loss. In some cases, where the designer can choose between the efficiency and capacity augmentation, selective operation of the reheat coil may offer an additional step of capacity modulation, in the heating mode. System reliability is improved through a reduction of start / stop cycles. Although various reheat coil arrangements in relation to the indoor and outdoor heat exchangers are offered and reheat concepts are considered, the benefits of the invention are independent from and transparent to such system design features.

Methods and system for providing de-icing a heat pump heat exchanger and heating a vehicle passenger cabin are presented. In one example, a heat pump that experiences icing of exterior heat exchanger fins may be operated in a cooling mode where a passenger cabin heat exchanger operates as an evaporator to improve de-icing of the exterior heat exchanger fins.

The invention relates to a solution dehumidifying fresh air handling unit combining heat pump drive and evaporative cooling, 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 an interstage solution circulation loop formed by connecting a dehumidifying module, a regeneration module and a solution circulating pump; the heat pump system comprises a solution heat exchange circulation loop formed by connecting a compressor, a first condenser, a throttle valve and an evaporator sequentially and a water heat exchange circulation loop formed by connecting the compressor, a solenoid valve, a second condenser, the throttle valve and the evaporator sequentially; the first condenser and the heat-exchange end of the evaporator are respectively connected with the regeneration module and the dehumidifying module through the solution circulating pump to form two intrastage solution circulation loops; the evaporative cooling water system comprises an evaporative cooling module, a water circulating pump and a water replenishing valve; and the evaporative cooling module is connected with the second condenser through the water circulating pump to form a circulation loop performing heat exchange with refrigeration working media. The solution dehumidifying fresh air handling unit can be widely applied to occasions without indoor ventilation for use.

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.

In a heat-pump water heater, a control unit has a heat-radiation determining means for determining a heat radiation from refrigerant to outside air in an air heat exchanger based on a water temperature flowing into a water heat exchanger, and the control unit selectively performs a general cycle operation and a bypass operation in accordance with a determination result of the heat-radiation determining means. That is, when the water temperature flowing into the water heat exchanger is lower than 60° C., the general cycle operation is performed. On the other hand, when the water temperature is equal to or higher than 60° C., the bypass operation is performed.

An air conditioning control system includes a casing including paths through which air passes, dampers arranged at an entrance and an exit of each of the paths and operated to open or close the entrance and the exit according to a control signal, a heat and mass exchanger including a hygroscopic material for absorbing moisture and arranged across the paths to be rotated with respect to the casing, a driving unit rotating the heat and mass exchanger, a heat exchange unit having a heat transfer medium flowing inside the heat exchange unit and arranged on at least one of the paths, and a controller opening or closing the entrance and the exit of the paths by applying a control signal to the dampers, and changing a rotation speed of the heat and mass exchanger by applying a control signal to the driving unit, according to operation modes.

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 discloses a solar heat-source tower heat pump composite heating device. The device comprises a heat source tower heat pump heating system, a solar heat collector heating system, a phase-change heat storage system and a phase-change heating system. The composite heating device is convenient to install, compact in structure, high in integration rate, wide in application range and high in heat energy utilization rate and photothermal conversion efficiency, and can be widely used for various places in which heat is required to be supplied.

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 relates to a heating installation comprising: a first circuit (K1) comprising a first medium, a second circuit (K2) comprising a second medium, a first heat pump (2) arranged in the first circuit (K1) for heating the first medium, a third circuit (K3) comprising a third medium, a heat exchanger (40) which is arranged in the third circuit (K3) and which is connected between the condenser (2d) and the expansion valve (2f) of the first heat pump in order to transfer heat from the working medium of the first heat pump to the third medium in the third circuit (K3), and a second heat pump (3) arranged for heating the second medium in the second circuit (K2) by absorbing heat energy from the third medium in the third circuit (K3).

The invention relates to a heat pump system (10) comprising a heat pump (5) so arranged as to permit the taking up of thermal energy from outdoor air and the giving off of thermal energy to another medium (20), and an external space (2) adapted to permit heating of the outdoor air by the use of solar radiation (12), the system (10) being so arranged as to conduct the outdoor air to the heat pump (5) via the external space (2). The invention is characterized in that the heat pump system (10) comprises means (3, 6, 7, 7a, 7b, 9) for regulating the flow of the outdoor air to the external space (2).

The invention belongs to the technical field of energy source engineering and relates to a solution temperature and humidity adjustment air treatment system, which is a high-efficiency and energy-saving system that combines a heat and mass transfer system and heat pipe energy conservation and heat pump energy conservation technology to realize the temperature and humidity adjustment air treatment. The system is an integrated solution temperature and humidity adjustment air treatment system formed by organically communicating an air circulation subsystem, an N-stage solution treatment subsystem, a solution flowing and storing subsystem, an M-stage solution regeneration subsystem, a P-stage heat pipe heat return subsystem, a heat pump cold or heat supply subsystem, an L(or L+1)-stage air cooling tower subsystem, a cooling water circular flow subsystem, a temperature control subsystem and a humidity control subsystem with a low-temperature auxiliary heat source, wherein N is more than or equal to 1 and less than or equal to 20; and N is equal to M, P and L. The system has the advantages of mineral and energy conservation, slight pollution, novel and simple structure, combined temperature and humidity control process, small dehumidification module volume, large mass transfer driving force, high energy utilization rate, energy conservation, high heat pump efficiency, wide application range and the like.

A circuit board controller enables a solar hot water system to be used in conjunction with, and assist, a conventional heating system such as a furnace. If some heat is available from solar heating, then the solar heat is used for pre-heating so the conventional heating system does not have to perform as much work. If there is enough heat available from solar heating to provide all of the heat that is needed, then operation of the conventional heating system is locked out.

An improved reversible cycle heat pump system incorporating powered subcooling to increase heating capacity by over 50 percent over conventional heat pump technology without imposing a performance penalty; wherein over 21 percent is attributable to evaporator capacity gained by subcooling, over 21 percent is attributable to recovery and utilization of sensible heat energy removed as a by-product of subcooling, and over 8 percent is attributable to recovery and utilization of sensible heat energy resulting from the conversion of electric energy to mechanical work, heat of compression, and mechanical heat of friction. The powered subcooling improvement is also easily installed as original equipment, or retrofitted to existing heat pump systems.

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).

A temperature controlled cabinet system and method enables medical items associated with particular temperature ranges to be stored and maintained within the associated temperature ranges in cabinets disposed within ambulances and other medical vehicles. The system includes a temperature sensor for measuring the cabinet interior temperature, a controller assembly for controlling system operation and two head pumps disposed in the cabinet walls to heat or cool the cabinet interior. Alternatively, a single head pump may be utilized to heat or cool the cabinet interior. The controller assembly includes a control console for displaying the actual cabinet temperature and entering a desired temperature range into the system. The heat pumps include a pair of heat sinks disposed about a thermoelectric device (e.g., a Peltier chip) that heats one heat sink, while cooling the other heat sink based on voltage polarity or current flow direction applied to the device. The system controls voltage polarity applied to the thermoelectric device to enable the heat pumps to heat or cool the cabinet interior in response to a comparison of the measured temperature with the desired temperature range. The system utilizes D.C. power from the vehicle electrical system, and may be installed in new cabinets or retrofit into previously disposed cabinets lacking temperature control capability.

Methods and systems for de-icing an exterior heat exchanger of a vehicle's heat pump are presented. In one example, a positive temperature coefficient (PTC) heater provides heat to refrigerant that de-ices the exterior heat exchanger. In some examples, an additional PTC heater provides heat to engine coolant to warm a vehicle's passenger cabin when the vehicle's exterior heat exchanger is being de-iced.

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.