76results about How to "Low electricity price" patented technology

The present invention discloses a method of utilizing distributed energy and temporary additional electricity price to optimize control cooperatively. The method comprises the steps of S1 determining power supply areas and a grid structure; S2 predicting the morrow RDG output and the user original load; S3 calculating the user load after the time-of-use electricity price; S4 carrying out the day-ahead optimization scheduling on the power supply areas, and starting a standby set in necessity; S5 gathering the output of the standby set; S6 carrying out the intra-day rolling calculation, namely controlling the RDG output and the user load according to the temporary additional electricity price; S7 gathering the RDG output reduction quantity and the user load reduction quantity. According to the present invention, a more flexible and changeable and more reasonable scheduling mode is provided for an active power distribution network, and fully embodies the distributed energy real-time scheduling control capability, the load flow bidirectional management capability and the distributed energy admission capability required by the active power distribution network, thereby improving the overall operation stability and robustness of the power distribution network.

The present invention discloses a smart power supply system for electrical appliances, using a rechargeable power storage device, a logic controller, and a learning controller, to control and minimize electricity consumption from mains power during standby. In standby mode, when only a small amount of electrical power is needed, energy from the power storage device is used and mains power is disconnected unless the power storage device requires a recharge. A logic controller senses the appliance's operating state, using it to determine when power should be supplied from mains power or the power storage device. A learning controller monitors and stores historical characteristics of the power storage device's charge and discharge cycles, using them to automatically calculate new recharge cycle parameters to minimize mains power consumption. An external input and output module enable users, computers and electronic devices to interact and program the learning controller.

The invention discloses a cloud service distributed data center system which comprises a system state monitoring module, a load admission control module, a load routing distribution module, a load dispatching module and a multi-source energy supply management module. The system state monitoring module is used for acquiring cloud service requests from different users, recording the cloud service requests and information related to the cloud service requests and transmitting the cloud service requests to the load admission control module, the load admission control module is used for selecting parts of the cloud service requests according to the number of the received cloud service requests and transmitting the cloud service requests to the load routing distribution module, and the load routing distribution module is used for distributing the received cloud service requests to corresponding data centers for processing. The cloud service distributed data center system can solve the problems that a data center energy supply system in an existing system is high in long-term operating expenditure and unstable in new energy supply, electricity price fluctuates, and system data or stable distribution needs to be acquired in advance.

The invention discloses a multi-energy online control system for data centers under dynamic cloud service requests. The multi-energy online control system for data centers under dynamic cloud service requests comprises a system status monitoring module, a load scheduling module and a multi-source energy supply system management module, wherein the load scheduling module comprises a delay-sensitive request scheduling sub-module and a delay tolerant job scheduling sub-module. The system status monitoring module is used for receiving service requests from a user's cloud service every once in a while, determining whether the cloud service request is a delay-sensitive request or a delay tolerant job, and sending the cloud service request belonging to the delay-sensitive request to the delay-sensitive request scheduling sub-module of the load scheduling module while sending the cloud service request belonging to the delay tolerant job to the delay tolerant job scheduling sub-module of the load scheduling module. The multi-energy online control system for data centers under dynamic cloud service requests has the advantages that long-term operating cost of data center energy supply system can be optimized, no system data is needed to be obtained in advance, and no steady state distribution is needed to be assumed.

The invention is a wind power generator, comprising pillar and pillar tensioning ring, where the pillar tensioning ring is connected with tensioning steel rope, a device for wind vane to connect with generator casing is above the tensioning ring, the top end of the pillar is equipped with wind vane beam mount, and a cable is connected from the generator in the generator casing to a generator set control room and the control room is connected with external electric network through cable. And this sail-like wind vane with strong wind catching ability stands up against the wind on the beam mount and falls down reversely, can generate huge torsion force by weak wind, implements anti-vibration auto control, hydraulic auto adjustment, horizontal rotation as horizontal arranged, vertical rotation as horizontal arranged, and horizontal rotation as vertical arranged, and is supported by the pillar, the horizontal grid of steel rope tensions and fixes the wind power generator, and the foundation construction investment is less, the economic property is remarkable, and the wind catching ability is strong, and the invention has features of larger erection height, good stability, large unit capacity, strong anti-damage ability, and wide application range. And the generated power is a clean renewable electric energy.

The present disclosure provides a machine tool power consumption prediction system configured for predicting power consumption of a machine tool. The machine tool executes numerical control programs to produce parts, and various parameters are included in each of the numerical control programs. The machine tool power consumption prediction system includes a power consumption database and a computer. The power consumption database stores power consumption data associated with different values of the parameters included in the numerical control programs. The computer is connected to the power consumption database to retrieve the power consumption data, and generates a power consumption estimate associated with each of the numerical control programs to be executed by the machine tool.

The invention discloses a JFET (Junction Field Effect Transistor) and a manufacturing method thereof, and a micro inverter using the JFET. The JFET comprises a drain ohmic contact electrode, a substrate, a SiC drift layer, an N-type SiC channel layer, an N-type SiC ohmic contact layer and two gate Schottky contact electrodes. The manufacturing method comprises the following steps of providing the substrate; forming a SiC epitaxial layer; forming the N-type SiC channel layer and the SiC drift layer; forming the N-type SiC ohmic contact layer; forming drain and source ohmic contact electrodes; and forming the two gate Schottky contact electrodes. The micro inverter comprises capacitors C1, C2 and C3, an inductor L1, a JFET1, a JFET2 and a JFET3, and silicon carbide Schottky diodes D1, D2, D3 and D4. According to the JFET, the manufacturing method thereof, and the micro inverter, the realization is convenient, the cost is low, the working frequency and the working reliability of the micro inverter are improved, the loss and the price of electric energy are reduced, and the practicality is high.

The invention relates to a heat energy conversion and utilization technology, in particular to an energy storage heat pump air conditioner which can solve the problems that an existing mainstream heat pump can not utilize peak-valley electricity and reduce the running time of a host during peak electricity at night, the energy storage heat pump air conditioner comprises an energy storage device, a cold and heat source tower and a heat pump host, two pipelines are arranged between the energy storage device and the heat pump post, a first pump is arranged on one pipeline, and a first shut-off valve is arranged on the second pipeline; two pipelines are arranged between the cold and heat source tower and the heat pump post, a second pump is arranged on one pipeline, and a second shut-off valve is arranged on the other pipeline; a first interface is arranged between the energy storage device and the first shut-off valve, a second interface is arranged between the cold and heat source tower and the second shut-off valve, and a third shut-off valve is arranged between the first interface and the second interface; and a third interface is arranged between the heat pump host and the first pump, a fourth interface is arranged between the cold and heat source tower and the second pump, the third interface and the fourth interface are connected by using the pipeline, and a fourth shut-off valve is arranged between the third interface and the fourth interface. The energy storage heat pump air conditioner can reasonably utilize the peak-valley electricity and reduce the running power fare.

The invention discloses a method for driving high-temperature liquid metal to flow circularly to cool internal components of a reactor. According to the method, the liquid metal flows out of a left-side metal tank and then flows to the internal components of the reactor under the action of high-pressure (2MPa) inert argon; the high-temperature liquid metal carries out nuclear heat, then flows to a heat exchanger, exchanges heat with a secondary loop working medium, and finally flows to a left-side metal tank. When the liquid level of the liquid metal is reduced to a specified value, a control system controls an electromagnetic directional valve to switch, and the left-side metal tank and the right-side metal tank are respectively deflated and inflated to reach specified pressure. Hydraulic control one-way valves are controlled to be switched on; the liquid metal flows through the internal components of the reactor from the right-side metal tank; the high-temperature liquid metal is then subject to heat exchange and flows into the left-side metal tank. According to the invention, the high-temperature liquid metal is periodically and circularly driven to flow stably to cool the internal components of the reactor; as the system adopts the high-pressure inert gas to drive the high-temperature liquid metal to flow, the limit of using an electromagnetic pump to drive the high-temperature liquid metal is overcome and the high-temperature liquid metal in an advanced reactor can flow circularly.

The invention relates to a method for producing pyromellitic dianhydride, which solves the problems of high energy consumption, high treatment cost of 'three wastes' and the like in the conventional production process. The process of the method comprises the following steps: 1, oxidization, namely taking durene and the air as raw materials, performing an oxidizing reaction in the presence of a catalyst at a high fused salt temperature in a reactor to prepare a gaseous phase mixture, and recovering a semi-finished product of crude anhydride through three tandem cold-traps; 2, discharging, namely cleaning raking out all crude anhydride in the cold-traps; 3, hydrolysis and centrifugation, namely heating the crude anhydride prepared by oxidation by steam in a soft water hydrolysis kettle to form liquid through smelting, hydrolyzing the liquid to form pyromellitic methanoic acid, performing recrystallization after the decoloration by activated carbon and heat filtration, and obtaining the eligible pyromellitic methanoic acid and crude tetracid crystals through centrifugation; and 4, performing dehydration and sublimation to obtain a product of the pure pyromellitic dianhydride. The method reduces the energy consumption, and can save the production cost of 1 million Yuan in the production of 100 tons of pyromellitic dianhydride.

Provided are a device and a method for generating electricity by using river water. A platform is arranged overhead river head of rivers, rivuses or man-made rivers and with water flowing all the years, a water impeller shaft arranged on the platform rotates under driving of flowing water in rivers and is transmitted through an actuator, and a generator generates electricity. A power generation deivce using river flow power sources can be arranged at any position from flow on the side of rivers and the rivuses to the center of the rivers and the rivuses and in river and rivus basins, and the power sources of river water and output from the device are used for power generation in river water or water pumping in river water.

The invention provides a lowest equivalent electrovalence-of-system-based microgrid system design scheme and a test platform. Each subsystem of a microgrid system at least comprises a wind generator set, a photovoltaic set, an energy storage device, a water turbine set, a diesel engine set or a gas engine set. The structure of the microgrid system is determined through analyzing different load characteristics, natural resources and power supply types of the subsystems of the microgrid system; electric cost models of the subsystems of a microgrid are established; change parameters such as the investment cost of microgrid construction, the equivalent cost of power generation and load power demand increases are comprehensively considered to carry out distributed generation power supply selection and capacity configuration; and the microgrid system is established employing the lowest equivalent electrovalence of the system as the target, so that the microgrid system design scheme meeting the economic requirements is rapidly obtained; and the microgrid system test platform is formed by adopting an MVC mode.

The invention discloses a deployment method of a distributed power supply system. The method is executed by a computing device. The method comprises the steps of establishing a generating capacity planning model of the distributed power supply system, wherein the control variables of the generating capacity planning model include the installation position and the generating capacity of each distributed power supply, and the line loss minimization and the generating capacity maximization of the distributed power supply system are adopted as a target; subjecting the generating capacity planning model to iterative solving based on a predetermined algorithm so as to respectively obtain an optimal solution for the installation position and the generating capacity of the distributed power supply; adopting the optimal solution as the planning scheme of the distributed power supply system; calculating the net present value of the distributed power supply system according to the planning scheme of the distributed power supply system; subjecting the planning scheme to feasibility analysis; and adjusting the planning scheme according to an obtained analysis result. The invention also discloses a deployment device and a computing device corresponding to the distributed power supply system.

The invention discloses a coastal electricity system for supplying power to ships, and an electrical system for ships. The coastal electricity system comprises at least one isolation transformer with an automatic voltage regulating function, at least one costal power box and a control system, wherein the input end of the isolation transformer is used for connection with the power output end of factory power of a thermal power plant, the output end of the isolation transformer is used for connection with the coastal power box; the coastal power box is used for connection with power supply interfaces of the ships through cables and connection with electrical signal interfaces of the ships through signal lines; and the control system is used for receiving electrical signals of the ships, transmitted by the coastal power box and coastal power box information, and according to the electrical signals and the coastal power box information, controlling the coastal power box so as to conduct or break connection between the power supply interfaces and the power output end. The coastal electricity system provided by the invention has the advantages of being simple in structure and easy to operate, saving electricity bills for the ships and being safe and reliable.

The invention discloses a multifunctional automatic phase changing system for a medium / low voltage line and a phase changing method thereof. The phase changing system comprises a master control moduleand multiple execution modules; each execution module corresponds to multiple users that are connected in parallel; the master control module comprises a master controller and a three-phase current sampling unit; each execution unit includes an electronic phase changing switch; and the electronic phase changing switch selects, according to a switching command, one phase corresponding to the switching command from three power supply phases of a transformer to supply a power to the multiple users corresponding to the execution modules. According to the multifunctional automatic phase changing system for the medium / low voltage line and the phase changing method thereof, the master control module and the execution modules are provided, lines in a power distribution area are divided, and the multiple execution modules are controlled via the master control module arranged at a power distribution transformer end to switch three phases of each line, so that three-phase power loads of all switched lines tend to balance; and thus, the unbalancedness of the three phases is improved, the line loss of the power distribution area is reduced, the power quality of the users is guaranteed, and thepurposes of saving the energy and reducing an electricity price are implemented.

The invention provides an energy-saving chilled water storage structure and belongs to the field of energy storage. The energy-saving chilled water storage structure comprises a cold energy storage tank and a high-pressure air tank. The high-pressure air tank is connected with an air pump. The air pump is connected with an air inlet pipe. The air inlet pipe is communicated with the outside. The high-pressure air tank is connected with an air outlet pipe. The air outlet pipe is located at the bottom of the cold energy storage tank. The bottom of the cold energy storage tank is provided with a choking mechanism. The choking mechanism comprises a limiting plate arranged on the bottom wall of the cold energy storage tank. The limiting plate divides the bottom space of the cold energy storage tank into two chambers, wherein one chamber is internally provided with the air outlet pipe. The choking mechanism further comprises an air guide plate fixed to the inner wall of the cold energy storage tank. The other end of the air guide plate is in a suspended state. The air guide plate inclines downwards. An air passing opening is formed between the air guide plate and the limiting plate. Air discharged out of the air outlet pipe can pass through the air passing opening to move toward the bottom of the cold energy storage tank. The top of the cold energy storage tank is provided with a cold air pipe. The cold air pipe leads into a room. The air outlet pipe is provided with a solenoid valve. The chilled water storage structure is high in refrigerating efficiency and cold energy utilization rate, cold air is fresh, and the electricity price is low.

A novel designed turbine using ocean wave or other shifting water wave to generate power has impellers of flat or concave front surface and convex back surface. This turbine turns in one direction no matter which direction water comes from. The turbine is fixed on a controllable floating box, so that it can catch water wave no matter on flood tide or ebb tide. The energy from the turbine magnified by a variable system runs the rotor at high speed to generate electricity. A concrete base fixed the floating box, the turbine and the power generation device to sea shore. In case making the impellers of flat surface and horizontally fixed into rive, the turbine can be used for electricity generation also.

The present invention relates to a magnetic wheel machine generating unit. It includes prime mover, power generator and field exciter, etc. It is characterized by that between prime mover and power generator the magnetic wheel machine is set, in the interior of the magnetic wheel machine a fixed magnetic wheel and a rotary magnetic wheel are assembled, and a fixed magnetic ring and a rotary magnetic ring are respectively assembled on the opposite positions of fixed magnetic wheel and rotary magnetic wheel, and the opposite sides of two magnetic rings are identical in polarity.

The invention relates to the technical field of clean energy and water electrolysis hydrogen production, in particular to a water electrolysis hydrogen production system, which comprises a hydroelectric generation system, an electric power storage system, a water electrolysis hydrogen production system, a hydrogen purification system and a hydrogen storage system, wherein the lower side of the hydroelectric generation system is provided with the electric power storage system; the water electrolysis hydrogen production system is arranged on one side of the hydroelectric generation system, the hydrogen purification system is arranged at one end of the water electrolysis hydrogen production system, and the hydrogen storage system is arranged at one end of the hydrogen purification system. Inthe invention, by arranging the hydroelectric generation system, the hydrogen storage system, the water electrolysis hydrogen production system and the hydrogen purification system, waste water is used for power generation, energy waste is avoided, the electricity price is low, on-site hydrogen production is achieved, and energy storage is facilitated.

The invention relates to a comprehensive utilization method of heat energy in a potassium perchlorate production process, which belongs to the technical field of potassium perchlorate production. The invention aims to solve the technical problem of providing a new heat supplying method for the technical field of potassium perchlorate production, increases energy utilization efficiency and solves environmental pressure caused by the three wastes generated by the coal consumption of a boiler. The invention has the technical schemes of: heating by adopting high-temperature heat conducting oil, in particular to a conduction process that after the heat conducting oil is heated, transmitting heat to materials which need to be heated to cause that the temperature of the heat conducting oil is reduced, and repeatedly heating. The comprehensive utilization method increases energy utilization efficiency and reduces the environmental pressure caused by the three wastes generated by the coal consumption of a boiler, and otherwise, the comprehensive utilization method increases continuous production capacity, is suitable for large-scale production requirements and breaks the tradition that a perchloric acid double-decomposition process is only heated by steam in a long period.

The present invention provides a cooling system-containing gondola lift having a capacity for at least one passenger, the gondola lift comprising a cabin and a cooling system installed in the cabin, wherein the cooling system comprises: a porous case having a plurality of holes; a block of ice disposed in the case; a liquid container connected to the case for housing the liquid melted from the block of ice; and an atomizer for atomizing the liquid melted from the block of ice.

The invention provides a machine tool power consumption prediction system and a method. The machine tool power consumption prediction system configured for predicting power consumption of at least one machine tool. The machine tool being for executing numerical control programs to produce parts, and various parameters are included in each of the numerical control programs. The machine tool power consumption prediction system includes a power consumption database and a computer, the database stores power consumption data associated with different values of the parameters included in numerical control programs. The computer is configured to assess the numerical control program against the power consumption database and generates a power consumption estimate associated with each of the numerical control programs to be executed by the machine tool.

The invention provides an outdoor energy storage charging system comprising an integrated cabinet. The input terminal of the integrated cabinet is connected to a transformer with commercial power and the output terminal of the integrated cabinet is connected with a plurality of charging devices. A high-voltage control cabinet, a central processing cabinet and an energy storage battery pack that are connected successively are arranged inside the integrated cabinet. The high-voltage control cabinet is used for voltage transformation, rectification, discharge outputting and charging inputting control of the system; a GPRS receiving and sending antenna is arranged at the high-voltage control cabinet to realize wireless alarming to a remote control center terminal. The central processing cabinet is used for collecting battery information of the energy storage battery pack. A plurality of energy storage battery pack units connected in series are arranged inside the energy storage battery pack. IC sensing regions are arranged at the charging devices and charging payment two-dimensional codes are arranged in the IC sensing regions. The outdoor energy storage charging system having a large coverage range is used convenient; and a peak-load shifting effect is realized, so that the burden is reduced for the daytime consumption of commercial power.

The present invention is electricity generating technology with marine energy, water energy and wind energy. Sea waves in different directions are utilized for generating electricity by means of one novel water wheels with vanes possessing flat or notched upper side and raised lower side. The energy the novel water wheels accepts is amplified in a speed varying system and converted into the fast rotation of rotor in the generator to generate electricity. The sea wave generating apparatus includes concrete pedestal, limited floating box, novel water wheels, generator, etc. When the novel water wheels is reformed into one with planar vane wheel and set in river, one novel water energy generating equipment is formed. Wind energy in sea and river is also utilized in generating electricity simultaneously.

The invention relates to a multi-layer roller hearth waste heat utilization cyclic furnace and a waste heat recovery method applied to the multi-layer roller hearth cyclic furnace. The multi-layer roller hearth waste heat utilization cyclic furnace comprises a furnace body, an elevator, a vacuum ventilation chamber, a material inlet and outlet table, a transmission system and a control system. The transmission system comprises a transmission device which is connected with a motor. The material inlet and outlet table, the vacuum ventilation chamber, the elevator and the furnace body are sequentially connected. An electric furnace door is arranged between the furnace body and the elevator. A furnace shell is arranged outside the furnace body. Multiple heating bodies and at least two layers of in-furnace carrier rollers are disposed in the furnace body. The in-furnace carrier rollers of each layer are arranged on the transmission device. The control system controls forward and reversing transmission of the transmission device and ascending and descending of a lifting movable table. Compared with a continuous furnace and a cyclic furnace in the prior art, the multi-layer roller hearth waste heat utilization cyclic furnace has the advantages that charge capacity is large, the application range is wide, energy consumption for production is low and production efficiency is high.

A home electric appliance of the present invention includes an input operation unit for inputting desired time information indicating any of a desired operation start time and a desired operation end time; a receiving unit for receiving a time shift calculation result including any of an operation start time and an operation end time and an electricity charge of which an amount becomes not more than a predetermined value when the appliance is operated according to the operation start time or the operation end time within a predetermined period determined by the desired time information; a storage unit for storing a reference value with which the time shift calculation result is evaluated; a comparison evaluation unit for carrying out comparison processing which compares the time shift calculation result with the reference value stored in the storage unit; an operation control unit for controlling operation of the appliance based on the time shift calculation result; and a display unit for displaying information regarding the operation. The display unit changes a display method according to a comparison result by the comparison evaluation unit.

The invention provides a novel inflatable chilled water storage system and belongs to the field of energy storage. The chilled water storage system comprises a chilled water storage pool and further comprises a high pressure gas tank, the high pressure gas tank is connected with an air pump, an air inlet of the air pump is communicated with a first air inlet pipe, one end of the first air inlet pipe is communicated with the air pump, the high pressure gas tank is connected with a first air outlet pipe, the outer end of the first air outlet pipe is communicated with the high pressure gas tank, and the inner end of the first air outlet pipe is located at the bottom of the chilled water storage pool. An air distribution plate is arranged at the bottom of the chilled water storage pool, the inner end of the first air outlet pipe penetrates through the air distribution plate, and air holes are formed in the air distribution plate. A cold air pipe is arranged at the top of the chilled water storage pool, the first air outlet pipe is provided with a first electromagnetic valve, each air hole is provided with a first sponge sheet, the first air inlet pipe is provided with a second electromagnetic valve, the air pump is connected with a second air inlet pipe, and the second air inlet pipe is provided with a third electromagnetic valve. The air pump is further connected with a second air outlet pipe, the other end of the second air outlet pipe is led to the bottom of the chilled water storage pool, and the second air outlet pipe is provided with a fourth electromagnetic valve. The chilled water storage system has high refrigerating efficiency and a high cold capacity utilization rate, cold air is fresh, and the electricity price is low.

The invention provides a photocell array tracking device which belongs to the field of solar power application. Photocells for large-scale solar power generation are arranged in an array manner. In the prior art, the array is composed of a plurality of tracking devices which are respectively provided with two sets of transmission devices, thus a plurality of motors and gear reducers are needed, resulting in high cost. In the invention, two sets of transmission devices are adopted to drive the array, which comprises the following steps: a photocell frame (8) is fixed at both ends of a stub shaft (4) on a long shaft (3) to constitute a group and a plurality of groups constitute a row; beams (21) are adopted to fix a plurality of rows into the array; and flexible transmission parts (17) are adopted to sequentially sleeve transmission wheels (16) of the long shaft with driving wheels (10) at the end of a motor (9); flexible transmission parts (6) are adopted to sequentially sleeve delivery wheels (7) of a delivery shaft (18) with transmission wheels (5) of the stub shaft (4), thus driven wheels (15) on the delivery shaft (18) are coupled with driving wheels (14) at the end of a motor (13). In the device, two motors are adopted to drive the array and photocells of thousands of square meters track the sun, thus the generation cost is greatly reduced.

The invention relates to a management method and device for electric vehicle charging, equipment and a storage medium. The method comprises the steps that a charging request sent by a vehicle owner terminal is received; the maximum charging duration and the minimum charging duration are calculated; calling the predicted charging electricity price of each preset time period; if the charging staying duration is greater than the minimum charging duration, sequentially selecting the time period with the lowest predicted charging electricity price from the time periods; sending a maximum power charging instruction to the target charging pile at the starting time of each selected time period, so that the charging pile charges the automobile at the maximum power until the charging amount reaches the planned charging amount; and if the charging staying time length is smaller than the minimum charging time length, sending a maximum power charging instruction to the target charging pile until the actual charging time length reaches the charging staying time length. The method has the technical effects that the charging process is reasonable and convenient, and meanwhile, the charging cost is saved.

The invention provides a chilled water storage system with a purifying function and belongs to the field of energy storage. The system comprises a cold accumulation pool and further comprises a high-pressure gas tank, wherein an air pump is connected to the high-pressure gas, an air inlet of the air pump is communicated with an air inlet pipe, and an air outlet pipe is communicated with the high-pressure gas tank; the inner end of the air outlet pipe is located on the bottom of the cold accumulation pool, an air diversion plate is arranged in the cold accumulation pool, and the inner end of the air outlet pipe penetrates through the air diversion plate; ventilation holes are formed in the air diversion plate, a cold air pipe is arranged on the top of the cold accumulation pool and leads into a room, and an electromagnetic valve is arranged on the air outlet pipe; a purifying pipe is arranged on each ventilation hole, the bottom end of each purifying pipe is fixedly connected to the periphery of the corresponding ventilation hole, each purifying pipe is wavy, and the top ends of the purifying pipes do not extend out of the water surface; a wavy sponge strip is arranged in each purifying pipe, a round sponge piece is arranged on the top of the cold accumulation pool, and the sponge piece is fixed to the inner wall of the cold accumulation pool. The system is high in refrigeration efficiency and high in cold utilization rate, cold air is fresh, and electricity cost is low.