52results about How to "Improve system energy efficiency" patented technology

The invention discloses a method for improving communication energy efficiency based on antenna selection in a large-scale MIMO system. The method comprises the following steps: S1, establishing a system power consumption model according to a system channel status condition, transmission link power, receiving link power and conversion efficiency, and performing the channel estimation to obtain a channel status, and feeding back the channel status to a base station to determine the minimum capacity requirement at a user side and compute the minimum antenna number; S2, computing the antenna number with the optimal energy efficiency by use of an improved search method according to the system power consumption model and the minimum antenna number; S3, obtaining a sub-set more than the antenna number with the optimal energy efficiency by use of the maximum norm method, and then selecting an antenna array with the antenna number with the optimal energy efficiency by use of a successive subtraction method in the sub-set. Compared with the traditional antenna selection algorithm, the method disclosed by the invention has higher system capacity and lower computing complexity, the communication energy efficiency of the large scale MIMO system can be improved, and the performance of the system is improved.

A system energy efficiency controller in a smart energy network, a control method thereof, and a control method for a terminal device. The system energy efficiency controller includes a control decision module, a storage module, a power clock module, an internal communication module, and an external communication module. The storage module is connected to the control decision module, and stores temporary and permanent information data in the operation process of the storage system. The power clock module provides an internal clock, achieving timing synchronization of processors on the controller. The internal communication module provides two-way communication between the system energy efficiency controller and control implementation units of multiple terminal devices. The external communication module provides two-way communication between the system energy efficiency controller and a local optimizer. The multiple terminal devices include at least one of the terminal devices for the stages of energy production, storage, application and regeneration.

The invention discloses an energy efficiency optimization method suitable for a large-scale multiple-input-multiple-output system. The method comprises the steps: firstly creating an energy efficiency optimization model of a joint optimization base station antenna number, an antenna subset and transmission power; secondly proposing a low-complexity iterative search method, supposing that the base station antenna number is M, and carrying out the traversal of the base station antenna number from one to M; thirdly selecting one antenna number and then employing a suboptimal antenna selection algorithm based on a channel matrix norm for the selection of an antenna subset, wherein the energy efficiency is a quasi-concave function of transmission power after the antenna number and the antenna subset are determined, so the optimal transmission power can be solved through employing a convex optimization theory, and at this moment the energy efficiency corresponding to the optimal transmission power is the optimal energy efficiency under the current antenna number; finally comparing the energy efficiencies of M times, and obtaining the optimal energy efficiency of the system, the optimal antenna number, the antenna subset, and the transmission power. The method can reduce the cost of the system while improving the energy efficiency.

The invention discloses an enhanced vapor injection air conditioner system which comprises a vapor injection compressor, a reversing assembly, a first outdoor heat exchanger, a second outdoor heat exchanger and an auxiliary electronic expansion valve assembly. The vapor injection compressor is provided with an exhaust opening, a vapor return opening and an injection opening. The reversing assembly is provided with a first valve opening, a second valve opening, a third valve opening and a fourth valve opening. The second outdoor heat exchanger comprises a first heat exchange flow path and a second heat exchange flow path which exchange heat with each other. A main electronic expansion valve assembly is connected between the first end of the first heat exchange flow path and the second end of the first outdoor heat exchanger. The first end of the auxiliary electronic expansion valve assembly is connected with an inlet of the second heat exchange flow path. The second end of the auxiliary electronic expansion valve assembly is connected to the second end of the first heat exchange flow path, or the second end of the auxiliary electronic expansion valve assembly is connected between the main electronic expansion valve assembly and the first heat exchange flow path. The value of the ratio DB of the sum of the caliber of the main electronic expansion valve assembly to the sum of the caliber of the auxiliary electronic expansion valve assembly ranges from 1 to 7.

A fluid manifold includes a block with a first aperture, a second aperture, and a curved fluid passage fabricated, via an additive manufacturing process, through the block between the first aperture and the second aperture. The curved fluid passage surrounds a cavity and includes a non-zero radius of curvature. A fluid manifold includes a volume of material and a fluid passage fabricated, via an additive manufacturing process, through the volume of material. The fluid passage includes a first passive element having a first diameter, a second passive element having a second diameter, and an orifice having a third diameter. The orifice is located between the first and second passive elements. The first and second diameters are smaller than the third diameter. A fluid manifold having a single block of material with a curved passage fabricated through the single block of material is prepared by an additive manufacturing process.

The invention provides a double-temperature air conditioning system and a control method thereof. The double-temperature air conditioning system comprises a compressor, an outdoor heat exchanger, an indoor heat exchanger, and an intermediate heat exchanger. The compressor comprises two air inlets and at least one air outlet. The outdoor heat exchanger is connected with the air outlets of the compressor. The indoor heat exchanger comprises a first heat exchanger and a second heat exchanger. The first heat exchanger is connected with the outdoor heat exchanger through a first branch circuit. A first throttling device is arranged on the first branch circuit. The first heat exchanger is connected with the first air inlet of the compressor. The second heat exchanger is connected with the secondport of the outdoor heat exchanger. A second throttling device is arranged on a second branch circuit. The second heat exchanger is connected with the second air inlet of the compressor. The first branch circuit and the second branch circuit are connected with the intermediate heat exchanger at the same time. The double-temperature air conditioning system and the control method thereof can improve the energy efficiency of the air conditioning system.

A zone damper having a first portion responsive to the static pressure in a HVAC system to open and bleed an amount of conditioned air past the damper when the static pressure of the system increases above a selected level, a second portion controlled by a actuator to move between an open and a closed position in response to a zone thermostat, and a coupling mechanism coupling the first and second portions to limit the relative movements of the two portions with respect to each other, and a biasing mechanism exerting a torque against the system static pressure differential. The first portion can be a single one-piece undivided blade pivotally mounted with a shell surrounding the zone damper.

A powered ankle-foot prosthesis and associated methods of use are described herein. Such prostheses can employ an actuator and elastic components, the actuator being controlled to deliver net positive work to propel the wearing amputee forward and the elastic components being used to store and release negative energy to improve efficiency. Elastic components can be linear springs coupled with a cam and configured in parallel to the actuator. The cam profile can be designed to generate a desired spring torque versus angle curve rather than a spring stroke versus angle curve, thereby reproducing human ankle controlled dorsiflexion stiffness. Such configurations improve system energy efficiency and reduce both actuator torque and power requirements. Such prostheses can also operate in a passive mode, in which a nearly normal gait can be achieved even without powered assist.

The invention provides a dynamic clustering method for multi-base-station cooperation. The method comprises the following steps that parameters are initialized, wherein the parameters comprises a base station set, users dispatched by each time slot and each base station and the distance between each user and the corresponding base station; downlink channel state information from each base station to all the users is calculated and a channel norm mutual information matrix is calculated according to channel norm mutual information; according to each given cluster, the base station with the maximum channel norm mutual information is selected from the candidate base station set to serve as a leading base station and the leading base station is deleted from the candidate base station set; according to the size of channel norm mutual information, to the leading base station, of the remaining users, the base stations with the large channel norm mutual information to the leading base station are selected and subsumed in one cluster, and the selected base stations are deleted from the candidate base station set until the number of the base stations in each cluster satisfies the size of the cluster. According to the dynamic clustering method for multi-base-station cooperation, one leading base station is arranged for each cluster and other base stations in each cluster are selected according to the leading base station so that the complexity of system clustering can be effectively reduced and the system energy efficiency can be improved.

The invention discloses a window-type air conditioner, which comprises an indoor panel, a case, an evaporator, an indoor fan, a condenser, an outdoor fan, a compressor and a base plate; an upper centrifugal fan is selectively separated from a fan motor shaft; when the upper centrifugal fan is separated from the fan motor shaft, a lower centrifugal fan runs and the upper centrifugal fan stops; and when the upper centrifugal fan is connected with the fan motor shaft, the upper centrifugal fan and the lower centrifugal fan synchronously run under the drive of a fan motor. When the upper centrifugal fan is separated from the fan motor shaft, the lower centrifugal fan runs, the upper centrifugal fan stops, air enters the case from an air inlet grid at the bottom of the case, the air pressure in the case rises, and a part of air outwards flows from the air inlet grid on the upper wall of the case, so that falling leaves and sundries covered at the upper air inlet grid can be blown away, and the air inlet capacity of the upper air inlet grid is recovered.

The invention relates to a window type air conditioner comprising an indoor panel, a machine box, an evaporator, an indoor fan, a condenser, an outdoor fan, a compressor and a chassis. The outdoor fan of the air conditioner is a centrifugal fan which is axially perpendicular to the chassis, and a guide volute for guiding air flow is arranged around the outdoor fan. The bottom end of a lower motor shaft is provided with a water pumping part, and a guide pipe fitting with the water pumping part is simultaneously arranged on the chassis. When the motor runs, the water pumping part rotates in the guide pipe, and condensed water in the chassis is agitated to the inner upper part of the guide pipe and is scattered outward through drain holes arranged on the guide pipe. The condensed water reaches the lower centrifugal fan through the water pumping part and the guide pipe, and is then thrown away under the blade action of the lower centrifugal fan and sprinkled on the condenser. As a result, the condensed water carries out heat exchange with the condenser, and more heat is taken away. Therefore, the outdoor heat exchange capability of the window type air conditioner is improved, and the refrigeration efficiency of the air conditioner is largely improved.

The invention discloses a compressing mechanism and a rotary compressor. A compressing cavity, a refrigerant channel and a liquid storage cavity are defined in the compressing mechanism; the compressing cavity communicates with the liquid storage cavity; the liquid storage cavity communicates with the outside by the aid of the refrigerant channel; and heat insulating pieces are laid on at least part of the inner wall of the liquid storage cavity. According to the compressing mechanism, the heat insulating pieces are laid on at least part of the inner wall of the liquid storage cavity, when a refrigerant gas flows in the liquid storage cavity, a refrigerant does not make direct contact with an air cylinder, and the suction overheating phenomenon of the compressing mechanism in the operation process can be effectively controlled, so that the compressing mechanism can have relatively high system energy efficiency and operation reliability.

The invention relates to a thermoelectric heat pipe combined clothes dryer which comprises a thermoelectric refrigerator, a precooling heat exchanger, a reheating heat exchanger, a draught fan and a clothes drying cylinder. The thermoelectric refrigerator comprises a thermoelectric refrigerator cold end and a thermoelectric refrigerator hot end. Thermoelectric refrigerator cold end heat absorptionpieces are arranged at the thermoelectric refrigerator cold end, thermoelectric refrigerator hot end cooling fins are arranged at the thermoelectric refrigerator hot end. A refrigerant channel of theprecooling heat exchanger and a refrigerant channel of the reheating heat exchanger form a refrigerant internal circulation loop heat pipe through a refrigerant connecting pipe. An air channel of thereheating heat exchanger, air channels of the thermoelectric refrigerator hot end cooling fins, the draught fan, the clothes drying cylinder, an air channel of the precooling heat exchanger and air channels of the thermoelectric refrigerator cold end heat absorption pieces are connected through air ducts end to end to form an air circulating circuit. Compared with the prior art, the clothes dryeris free of noise, vibration and abrasion during operating, the size of the clothes dryer is reduced, unnecessary energy loss is reduced, and meanwhile the clothes drying time is shortened.

The invention discloses a shared photovoltaic conversion system, and the system comprises an interface converter, a direct current bus and a plurality of photovoltaic direct-fed household power supplysystems; each photovoltaic direct-fed household power supply system comprises household photovoltaic part and a plurality of loads; the household photovoltaic parts are fed into a direct-current bus,and the loads are connected into the direct-current bus through corresponding converters; the direct-current sides of the interface converters are connected with the direct-current bus, and the alternating-current sides of the interface converters are externally connected with an alternating-current power grid. Meanwhile, the invention discloses a corresponding maximum power point tracking method. Only one converter is arranged between the photovoltaic and the load, so two stages of AC/DC and DC/DC power conversion links are effectively saved, and the energy efficiency of the system is greatly improved.

The invention belongs to the field of industrial processes, energy and environmental protection, and particularly relates to a multi-energy gradient utilization heat pump low-temperature evaporation and concentration system capable of accurately controlling temperature. The multi-energy gradient utilization heat pump low-temperature evaporation and concentration system capable of accurately controlling the temperature comprises a heating tank, a steam cooling and condensing system, a heat pump circulating system, a vacuumizing and re-condensing system, a water circulating temperature adjusting system, a heat dissipation system and a material preheating system. According to the system, efficient heat exchange on the refrigerant side can be achieved, the pressure environment of the material heating coil is improved, the adverse problems caused by heating materials through a high-temperature refrigerant are effectively solved, the material treatment quality is improved, meanwhile, the superheat degree of secondary steam can be reduced, and the heat exchange environment on the evaporator side during initial starting is improved. The system can accurately control the boiling evaporation temperature of the materials and efficiently utilize the materials in a gradient manner according to energy grades, so that the purposes of saving energy and reducing carbon are achieved, and the system is very significant.

The invention discloses a GLV (Green Landleaf Variable refrigerant flow) and fresh air independent temperature-humidity control system and a mounting chamber thereof. The GLV and fresh air independent temperature-humidity control system comprises a GLV system and a fresh air system, wherein the GLV system comprises a GLV outdoor unit and at least one GLV indoor unit, each of the GLV indoor units is communicated with at least one air supply pipeline and comprises an enclosure, a micro-channel heat exchanger, a sound absorbing baffle and an air feeder, a recirculating air inlet is formed in each enclosure, the micro-channel heat exchangers are connected with the GLV outdoor unit, the air feeders are communicated with air supply pipes, and an air supply outlet is formed in one end part of each air supply pipe; and the fresh air system comprises a dehumidifying fresh air processor and fresh air pipes, one end of each fresh air pipe is communicated with the dehumidifying fresh air processor, a fresh air outlet is formed in the other end of each fresh air pipe, and fresh air sequentially passes through the dehumidifying fresh air processor and the fresh air pipes and finally flows out from the fresh air outlets. The GLV and fresh air independent temperature-humidity control system and the mounting chamber thereof are simple in structure and reasonable in layout, and can effectively reduce system energy consumption and improve the system energy efficiency and the indoor air quality.

The invention provides an air conditioning system and a control method. The air conditioning system comprises a circuit board, a double-stage compressor and a flash generator, wherein the double-stagecompressor is provided with a low-pressure inlet and a medium-pressure inlet, and an outlet of the flash generator communicates with the medium-pressure inlet. According to the air conditioning system and the control method, a heat dissipation assembly is arranged on the circuit board, cooling is carried out by further utilizing a refrigerant gravity liquid supply mode in the flash generator, a liquid refrigerant enters the inner side of the heat dissipation assembly for heat absorption through the flash generator, the refrigerant after heat absorption is changed into gas and flows back intothe flash generator, the gas-state refrigerant can also be used for supplementing the gas and increasing the enthalpy to the two-stage compressor, so that the energy efficiency of the system is improved; and when the heat dissipation assembly communicates with a heat exchange coil pipe, sealing circulation is formed between the heat dissipation assembly of the circuit board and the heat exchange coil pipe, heat of the circuit board can be transferred into the flash generator, namely, the heat of the circuit board can be recycled, so that the evaporation efficiency in the flash generator is improved, the exhaust volume of the flash generator is increased, and the energy efficiency of the system is improved.