CN111288597A

CN111288597A - Static ice storage air conditioning system of distributed photovoltaic efficient direct-drive multi-connected micro-tube evaporator

Info

Publication number: CN111288597A
Application number: CN202010158143.0A
Authority: CN
Inventors: 徐永锋; 李明; 高慧敏; 李国良; 刘春元
Original assignee: Jiaxing University; Yunnan Normal University
Current assignee: Yunnan University YNU; Jiaxing University; Yunnan Normal University
Priority date: 2020-03-09
Filing date: 2020-03-09
Publication date: 2020-06-16
Anticipated expiration: 2040-03-09
Also published as: CN111288597B

Abstract

The invention discloses a distributed photovoltaic high-efficiency direct-drive multi-connected micro-tube evaporator static ice-storage air-conditioning system which comprises a distributed photovoltaic energy system, an ice-making and cold-storage system, a cold-exchange and cold-supply system and a data control system.

Description

Static ice storage air conditioning system of distributed photovoltaic efficient direct-drive multi-connected micro-tube evaporator

Technical Field

The invention relates to the technical field of air conditioners, in particular to a static ice storage air conditioning system of a distributed photovoltaic high-efficiency direct-drive multi-connected micro-tube evaporator.

Background

In recent years, through continuous research of scholars at home and abroad for many years, solar photovoltaic refrigeration is continuously improved and developed in the aspects of product structure, system operation efficiency and refrigeration performance, and the research on photovoltaic refrigeration has achieved better results and has gone on the way of industrial development, but the research and application of photovoltaic refrigeration are still puzzled by the core problem of solar energy intermittency. In order to overcome the problems, two methods, namely grid-connected power generation and storage battery assistance, are mainly adopted to ensure the stability of the electric energy output by the photovoltaic module at the present stage, but the adopted methods of grid-connected power generation and storage battery assistance have limitations, and the technical problem of difficulty in energy storage of the existing photovoltaic refrigeration is solved and becomes the primary task of the research work of the photovoltaic refrigeration.

In a photovoltaic refrigeration system, if a certain product with mature technology and low price is adopted to replace a storage battery to store energy and can simultaneously solve the influence of solar fluctuation and intermittence on the refrigeration system, the solar photovoltaic air conditioner has wide application prospect.

Therefore, how to provide an air conditioning system that effectively solves the difficult problem of distributed photovoltaic energy storage is a problem that needs to be solved urgently by those skilled in the art.

Disclosure of Invention

In view of the above, the invention provides a distributed photovoltaic high-efficiency direct-drive multi-connected micro-tube evaporator static ice storage air conditioning system.

In order to achieve the purpose, the invention adopts the following technical scheme:

distributed photovoltaic efficient direct-drive multi-connected micro-tube evaporator static ice storage air conditioning system comprises:

the distributed photovoltaic energy system comprises a distributed photovoltaic array and an inverse control all-in-one machine used for controlling the output power of the distributed photovoltaic array to be at the maximum value;

the ice-making and cold-storage system comprises a variable frequency compressor controlled by the inverse control integrated machine to operate, a condenser, a throttling and shunting system, a microtube evaporation system, a confluence system and a gas-liquid separator, wherein the condenser, the throttling and shunting system, the microtube evaporation system, the confluence system and the gas-liquid separator are sequentially communicated with the variable frequency compressor to form a refrigeration cycle; the microtube evaporation system and the confluence system are positioned in the ice storage barrel;

the system comprises a cold exchange and supply system, a cold storage and supply system and a cold storage and supply system, wherein the cold exchange and supply system comprises a variable frequency water pump and a fan coil group, the variable frequency water pump is connected with the fan coil group through a pipeline, the variable frequency water pump is connected with the bottom of the ice storage barrel, and the fan coil group is connected with the top of the ice storage barrel; and

the data control system is electrically connected with the distributed photovoltaic energy system, the refrigeration ice storage system and the cold exchange and supply system respectively, and comprises a sensor, a data acquisition and transmission system and a data display terminal, and the data acquisition and transmission system is electrically connected with the sensor and the data display terminal respectively.

Preferably, in the above static ice storage air conditioning system of the distributed photovoltaic high-efficiency direct-drive multi-connected micro-tube evaporator, an MPPT controller is arranged in the inverse control all-in-one machine.

Preferably, in the above static ice storage air conditioning system of the distributed photovoltaic high-efficiency direct-drive multi-connected micro-tube evaporator, the ice making storage system and the cold exchange and supply system adopt a variable frequency drive mode.

Preferably, in the distributed photovoltaic high-efficiency direct-drive multi-connected micro-tube evaporator static ice storage air-conditioning system, the sensors include an air speed sensor for measuring the air speed, a solar irradiation intensity sensor for measuring the total irradiance, a distributed photovoltaic array output performance sensor for measuring the direct current voltage, the direct current and the power generated by the distributed photovoltaic array, a temperature sensor for measuring the temperature, an alternating current voltage sensor for measuring the operating voltage of the variable frequency water pump and the fan coil unit, an alternating current sensor for measuring the operating current of the variable frequency water pump and the fan coil unit, and a frequency sensor for measuring the operating frequency of the variable frequency water pump and the fan coil unit.

Preferably, in the distributed photovoltaic high-efficiency direct-drive multi-connected micro-tube evaporator static ice storage air-conditioning system, the distributed photovoltaic energy system further comprises an anemoscope for recording wind speed around the distributed photovoltaic array and a total radiation meter for recording total radiation value of the surface of the distributed photovoltaic array;

the anemoscope is electrically connected with the wind speed sensor, and the total irradiation meter is electrically connected with the solar irradiation intensity sensor.

Preferably, in the distributed photovoltaic high-efficiency direct-drive multi-connected micro-tube evaporator static ice storage air-conditioning system, the variable frequency compressor, the confluence system, the condenser, the throttling and shunting system, the ice storage bucket and the fan coil unit are all connected with temperature probes, and the temperature probes are electrically connected with the temperature sensors;

the variable-frequency compressor and the confluence system are further connected with a pressure probe, and the pressure probe is electrically connected with the data acquisition and transmission system.

Preferably, in the static ice storage air-conditioning system with the distributed photovoltaic high-efficiency direct-drive multi-connected micro-tube evaporator, the micro-tube evaporation system comprises refrigerant micro-tubes and fins, and the refrigerant micro-tubes are fixedly connected through the fins arranged at intervals.

Through the technical scheme, compared with the prior art, the invention discloses and provides a distributed photovoltaic high-efficiency direct-drive multi-connected micro-tube evaporator static ice storage air conditioning system, which has the following advantages:

(1) the ice cold accumulation air conditioning system has the advantages of mature technology, strong cold accumulation capacity, low price and the like, can fully utilize solar energy resources in the daytime to realize high-efficiency photovoltaic direct-drive ice making and cold accumulation, utilizes cold energy stored in the daytime for cold supply at night to realize ice accumulation to replace electric power storage, saves the investment and operation cost of the storage battery, can effectively reduce the energy conversion and storage loss between light, electricity and cold, overcomes the influence of solar irradiation intermittence on the working stability and durability of the photovoltaic refrigeration system, and effectively improves the photovoltaic refrigeration efficiency;

(2) the invention adopts the immersion type static ice storage refrigerant of the evaporator to transfer the cold energy to water completely, but because the evaporator is immersed in water, ice blocks are condensed on the surface of the evaporator, and the refrigerant absorbs heat from the water gradually and difficultly along with the increase of the condensation thickness of the ice blocks, therefore, the static ice storage air-conditioning system of the distributed photovoltaic high-efficiency direct-drive multi-connected micro-tube evaporator provided by the invention adopts the ice storage to replace the storage battery for energy storage, solves the technical problem of distributed photovoltaic energy storage, adopts the photovoltaic direct-drive technology to effectively overcome the influence of the solar irradiation intermittence on the working stability, continuity and persistence of the system, and adopts the multi-connected micro-tube evaporator system to optimize the matching relation of the static ice making efficiency of the immersion type evaporator and the ice layer thickness.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.

FIG. 1 is a schematic diagram of the overall structure provided by the present invention;

FIG. 2 is a schematic view of the working principle of the throttling and shunting system of the present invention;

FIG. 3 is a view showing the structure of the evaporator of the micro-tube in the ice bank in the x-axis and y-axis directions according to the present invention;

FIG. 4 is a view showing a structure of a microtube evaporator in an ice bank in the z-axis direction according to the present invention;

FIG. 5 is a schematic diagram of the parallel gas collection and confluence of the micro-tube evaporator according to the present invention;

FIG. 6 is a drawing showing the length and angle of insertion of the microtube gas headers of the microtube evaporator of the present invention into the evaporator gas headers;

FIG. 7 is a sectional view of the position of the microtube gas header of the microtube evaporator of the present invention on the surface of the evaporator gas header;

FIG. 8 is a graph showing the length and angle of insertion of the evaporator manifold into the gas collection manifold of the micro-tube evaporator of the present invention;

FIG. 9 is a sectional view of the evaporator manifold in position over the surface of the gas collection manifold in accordance with the present invention;

FIG. 10 is a schematic diagram of the parallel refrigerant separation of the microtube evaporator of the present invention;

FIG. 11 is a drawing showing the length and angle of the evaporator liquid-separating branch pipe in the evaporator liquid-separating pipe of the micro-pipe evaporator of the invention;

FIG. 12 is a sectional view of the evaporator liquid-separating branch pipe of the micro-tube evaporator of the present invention at the surface of the evaporator liquid-separating pipe;

FIG. 13 is a view showing the length and angle of the branch liquid distributing pipe inserted into the branch liquid distributing manifold of the micro-pipe evaporator according to the present invention;

FIG. 14 is a sectional view showing the position distribution of branch liquid pipes on the surface of a main liquid pipe in the micro-pipe evaporator of the invention.

In the context of figure 1 of the drawings,

1 is the sun, 2 is an anemometer, 3 is a total irradiation meter, 4 is a distributed photovoltaic array, 5 is an inverse control all-in-one machine, 6 is a variable frequency compressor, 7 is a condenser, 8 is a throttling shunt system, 9 is a micro-pipe evaporation system, 10 is a confluence system, 11 is a gas-liquid separator, 12 is an ice storage barrel, 13 is a variable frequency water pump, 14 is a fan coil group, 15 is a wind speed sensor, 16 is a solar irradiation intensity sensor, 17 is a distributed photovoltaic array output performance sensor, 18 is a temperature sensor, 19 is an alternating voltage sensor, 20 is an alternating current sensor, 21 is a frequency sensor, 22 is a temperature probe I, 23 is a temperature probe II, 24 is a pressure probe I, 25 is a pressure probe II, 26 is a temperature probe III, 27 is a temperature probe IV, 28 is a temperature probe V, 29 is a temperature probe VI, 30 is a temperature probe VII, 31 is a temperature probe VIII, A ninth temperature probe 32, a ninth temperature probe group 33, a data acquisition and transmission system 34 and a data display terminal 35;

in the context of figure 2 of the drawings,

81 is a flow divider valve, 82 is a control system, 83 is a first electromagnetic valve, 84 is a second electromagnetic valve, 85 is a third electromagnetic valve, 86 is a first ice layer thickness monitor, 87 is a second ice layer thickness monitor, 88 is a third ice layer thickness monitor, 89 is a first evaporator, 810 is a second evaporator, 811 is a third evaporator, 812 is a first refrigerant flow channel, 813 is a second refrigerant flow channel, 814 is a third refrigerant flow channel, 815 is a first ice layer thickness monitor signal line, 816 is a second ice layer thickness monitor signal line, 817 is a third ice layer thickness monitor signal line, 818 is a first control line, 819 is a second control line, 820 is a third control line, 821 is an ice storage barrel, and 822 is an expansion valve;

in the context of the figures 3-4,

refrigerant microtubes 91 and fins 92;

in the context of the figures 5-14,

1 to 20 are all micropipe gas collecting tubes, ① to ④ are all evaporator gas collecting tubes,

All evaporator collecting pipes, all evaporator liquid separating branch pipes 1 ' -20 ', all evaporator liquid separating pipes ① ' - ④

All are branch liquid separating pipes, 100 is a gas collecting main pipe, 100' is a main liquid separating pipe, 101 is a micro-pipe exhaust port, and 102 is a micro-pipe inlet.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

As shown in fig. 1, the distributed photovoltaic high-efficiency direct-drive multi-connected micro-tube evaporator static ice-storage air-conditioning system provided by the invention mainly comprises four subsystems, namely a distributed photovoltaic energy system, an ice-making and cold-storage system, a cold-exchange and cold-supply system and a data control system.

The distributed photovoltaic energy system mainly comprises a distributed photovoltaic array and an inverse control all-in-one machine, in daytime, the sun 1 irradiates on the photovoltaic array 4, photons in sunlight are emitted into silicon-based cells in the photovoltaic array 4 to excite electrons to generate direct current electric energy, the direct current electric energy is inverted into alternating current through the inverse control all-in-one machine 5, in order to ensure optimization of output electric energy, a maximum power point tracking technology (MPPT) is adopted inside the inverse control all-in-one machine 5, the electric energy output by the photovoltaic array 4 is always at a maximum power point under the condition of multilateral weather, and optimization utilization of solar energy is achieved. Because the distributed photovoltaic energy system does not have storage battery energy storage and grid connection, a plurality of parameters such as voltage, current and power of alternating current output by the inverse control all-in-one machine 5 do not have periodic change along with the change of solar irradiance, so that power utilization units in the ice making and cold storage system and the cold exchange and supply system all adopt a variable frequency driving mode, and the inverse control all-in-one machine 5 of the distributed photovoltaic energy system not only controls the output power of the distributed photovoltaic array to be at the maximum value, but also must control the running power of a variable frequency energy utilization load to be consistent with the photovoltaic output energy.

The ice-making cold-storage system is a core component and mainly comprises a variable frequency compressor 6, a condenser 7, a throttling and shunting system 8, a microtube evaporation system 9, a confluence system 10, a gas-liquid separator 11 and an ice-storage barrel 12. The variable frequency compressor 6 constantly performs variable frequency operation on the maximum power point of the distributed photovoltaic array 4 under the control of the inverse control all-in-one machine 5, the variable frequency compressor 6 compresses sucked low-temperature and low-pressure gaseous refrigerant into high-temperature and high-pressure saturated gas, the high-temperature and high-pressure saturated gas is discharged into the condenser 7 and condensed into medium-temperature and medium-pressure liquid refrigerant, the liquid refrigerant flows out of the condenser 7, enters the throttling flow splitting system 8 and is throttled into low-temperature and low-pressure liquid refrigerant, then is shunted into the micro-tube evaporation system immersed in the ice storage barrel 12 to absorb heat and evaporate into gaseous refrigerant, the heat of water around the micro-tube evaporation system is absorbed by the micro-tube evaporation system 9 and gradually reduces the temperature, the freezing is performed on the surface of the micro-tube evaporation system 9, the thickness of an ice layer on the surface of the micro-tube evaporation system 9 is gradually increased along with the continuous refrigeration, the gas-liquid coexisting refrigerant flowing out of the microtube evaporation system 9 is converged and arranged by the converging system 10 and then flows into the gas-liquid separator 11 for gas-liquid separation, and the gaseous refrigerant is sucked by the variable frequency compressor 6 to start the next refrigeration cycle.

In the cold exchanging and cooling cycle, the frequency conversion water pump 13 pumps out the cold water on the bottom layer of the ice storage barrel 12 and sends the cold water to the fan coil unit 14 for exchanging and cooling to serve different users, the cold water after cold exchanging flows back to the upper part of the ice storage barrel 12 to complete one cold exchanging and cooling cycle, and the direct cold water cooling of the ice storage barrel 12 has the characteristics of high cooling efficiency and obvious cooling effect.

The data control system is mainly used for monitoring, transmitting, storing and displaying parameters such as temperature, pressure, wind speed, irradiance, direct current, direct voltage, direct power, alternating current, alternating voltage, alternating power, running frequency and the like. In the invention, a first temperature probe 22 is adopted to measure the ambient temperature near the distributed photovoltaic array, and an anemometer 2 and a total radiation meter 3 are adopted to respectively record the wind speed around the distributed photovoltaic array 4 and the total radiation value of the surface of the distributed photovoltaic array 4; in the ice-making cold storage system, a temperature probe II 23 and a pressure probe I24 are adopted to measure the temperature and the pressure of high-temperature and high-pressure gaseous refrigerant discharged by the variable-frequency compressor 6 respectively, a temperature probe nine 32 and a pressure probe II 25 are adopted to measure the temperature and the pressure of low-temperature and low-pressure gas-liquid coexisting refrigerant flowing out of the confluence system 10 respectively, a temperature probe III 26 is adopted to measure the operating environment temperature of the ice-making cold storage unit, a temperature probe IV 27 is adopted to measure the temperature of medium-temperature refrigerant flowing out of the condenser 7, a temperature probe V28 is adopted to measure the temperature of low-temperature and low-pressure refrigerant flowing out of the throttling diversion system 8, a temperature probe VI 29, a temperature probe VII 30 and a temperature probe VIII 31 are adopted to measure the upper-layer water temperature, the ice-layer temperature and the lower-.

The measured temperature, wind speed and total irradiance data are transmitted to a data acquisition and transmission system 34 for recording and storing through a temperature sensor 18, a wind speed sensor 15 and a solar irradiation intensity sensor 16; the direct current voltage, the direct current and the power generated by the distributed photovoltaic array 4 after receiving the solar irradiance are transmitted to a data acquisition and transmission system 34 by a distributed photovoltaic array output performance sensor 17 for recording and storing; the running voltage, current and change frequency of the variable frequency compressor 6, the variable frequency water pump 13 and the fan coil group 14 are respectively transmitted to a data acquisition and transmission system 34 by an alternating voltage sensor 19, an alternating current sensor 20 and a frequency sensor 21 for recording and storing. The real-time data collected and stored by the data collecting and transmitting system 34 are transmitted to the data display terminal 35 through the wireless WiFi and displayed to the owner.

The distributed photovoltaic high-efficiency direct-drive multi-connected micro-tube evaporator static ice storage air-conditioning system provided by the invention can be driven by two modes, namely a mains supply mode and a distributed photovoltaic energy system, the driving mode is controlled by the inverse control all-in-one machine 5, the distributed photovoltaic energy system is preferentially adopted for driving, the distributed photovoltaic energy can drive the system to stably and efficiently operate no matter in sunny days, cloudy days or daytime under cloudy days, the distributed photovoltaic energy can not drive a refrigerating unit and a cooling system enough only under the condition of night or extremely low irradiance, the inverse control all-in-one machine 5 switches the driving mode to the mains supply at the moment, and once the energy output by the distributed photovoltaic energy system meets the driving condition, the inverse control all-in-one machine 5 immediately switches the driving mode to the distributed.

Specifically, the distributed photovoltaic high-efficiency direct-drive multi-connected micro-tube evaporator static ice storage air conditioning system provided by the invention has two cooling working conditions: the working condition of cooling while refrigerating and the working condition of first making ice and storing cold and then supplying cold.

Wherein, the working principle of the operation of refrigerating and cooling working conditions is as follows: after the system is started, the distributed photovoltaic energy system directly drives the refrigerating system and the cold exchange and supply system to operate at the same time, the cold energy produced by the refrigerating system is directly transported to the fan coil unit 14 through the cold water in the ice storage barrel 12 for users to use, the change situation of the cooling load is judged according to the change situation of the indoor temperature of the user measured by the temperature probe group 33 at the air outlet of the fan coil group 14, further, the rate of supplying cold water is adjusted to optimize the cold supply, and when the cold load of the user is balanced, the cold energy produced by the refrigerating system will be left, at this time, the surface of the microtube evaporating system 9 begins to freeze, the cold energy is stored in the ice storage barrel 12 in the form of ice blocks, when the solar irradiance is gradually reduced and the refrigerating capacity of the refrigerating system is not enough to maintain the cold load of a user, the cold energy stored in the ice block can release the cold energy to supplement the insufficient part of cold supply until the cold supply is finished. Because the cooling load for the office area is mainly concentrated in the daytime, the working condition of cooling while refrigerating is suitable for cooling the office area.

The working principle of the operation under the working conditions of firstly making ice and storing cold and then supplying cold is as follows: the method comprises the steps of firstly utilizing solar energy in the daytime to enable the distributed photovoltaic array to generate electricity to directly drive a refrigerating system to make ice and accumulate cold, and carrying out a cold exchange and supply phase after the ice making and cold accumulation phase is completed, so that the ice making and cold accumulation and supply working condition is suitable for household cold supply, the working hours of work and study in the daytime from monday to friday are provided with no cold supply demand at home, at the moment, the distributed photovoltaic energy system directly drives the refrigerating system to operate efficiently and stably, ice cubes are used for preparing stored cold, the ice cubes are learned and returned to home at night, the cold supply demand is provided at home, and at the moment, the commercial power is used for driving the.

Referring to fig. 2, the core component throttling and splitting system 8 in the ice making cold storage system operates as follows:

working condition 1: when the distributed photovoltaic direct-drive static ice storage air-conditioning system works under the working condition of ice making and cold storage before ice melting and cold supply, the liquid refrigerant flowing out of the expansion valve 823 flows into the shunt valve 81, and at the moment, the control system 82 transmits control signals to control the first electromagnetic valve 83 to be closed, the second electromagnetic valve 84 to be opened and the third electromagnetic valve 85 to be closed through the first control line 818, the second control line 819 and the third control line 820 respectively. The refrigerant flows into the second evaporator 810 through the second refrigerant flow channel 813, and the second evaporator 810 is immersed in the ice storage barrel 821 filled with water, so that the refrigerant absorbs heat from the water in the second evaporator 810 through the pipe wall, evaporates and is discharged, and is sucked into the compressor. After the water in the ice storage barrel 821 releases heat from the pipe wall of the second evaporator 810, the temperature is gradually reduced, the water is condensed into ice blocks on the pipe wall of the second evaporator 810 after being reduced to a certain degree to store cold energy, the thickness of the ice blocks condensed on the surface of the second evaporator 810 is gradually increased along with the progress of a refrigeration process, the stored cold energy is also gradually increased, but the refrigeration efficiency of the refrigeration system is gradually reduced, the ice making quantity and the refrigeration efficiency are in an inverse proportion relation and cannot be obtained simultaneously, but the ice storing quantity and the refrigeration efficiency are both required to be obtained by a user, so that in order to consider the refrigeration efficiency and the ice making quantity, the optimal icing thickness on the surface of the second evaporator 810 is 4cm through experimental tests and theoretical calculation analysis, the ice layer thickness on the surface of the second evaporator 810 immersed in water is monitored through the ice layer thickness monitor II 87, and when the ice layer thickness reaches 4cm, signals are transmitted to the second electromagnetic valve II 84 and the control system 82 through the ice layer thickness monitoring signal line II 816, at this time, the control system 82 controls to send a signal to open the first electromagnetic valve 83 and the third electromagnetic valve 85, close the second electromagnetic valve 84, enable the refrigerant of the flow dividing valve 81 to simultaneously and uniformly flow into the first refrigerant flow channel 812 and the third refrigerant flow channel 814, enable the first evaporator 89 and the third evaporator 811 to simultaneously ice and store cold, and because the first evaporator 89 and the third evaporator 811 are at the initial ice making stage, the ice making efficiency is high, and when the icing thickness of the first evaporator 89 and the third evaporator 811 reaches 4cm, the control system 82 closes the first electromagnetic valve 83 and the third electromagnetic valve 85, opens the electromagnetic valves corresponding to the other unfrozen evaporators, and enables the refrigerant to flow into the other evaporators to restart the ice making process. By adopting the intelligent shunting system to control the multi-connected evaporator in a time-sharing and segmented manner, the refrigeration efficiency of the whole distributed photovoltaic direct-drive static ice storage air-conditioning system can be improved to a greater extent, and considerable ice storage quantity is obtained.

Working condition 2: when the distributed photovoltaic direct-drive static ice storage air conditioning system works under the working condition of cooling while refrigerating, because the cooling capacity at the initial stage is large, in order to ensure that the cooling capacity in the ice storage barrel 821 is uniformly distributed, at the moment, the control system 82 opens all the electromagnetic valves to enable the refrigerant to flow into all the evaporators for refrigerating, and because the evaporators are dispersedly distributed at all the positions of the ice storage barrel 821, the process of transferring the cooling capacity between water in the ice storage barrel 821 is reduced by the dispersive refrigerating of the evaporators, the refrigerating speed is improved, and the effect of using the air conditioner immediately after opening is achieved. When the cold load of a user is balanced, the cold quantity produced by the refrigerating system is larger than the requirement of the user, the ice layer begins to condense around the evaporator of the refrigerating system, when the ice layer thickness monitor monitors that the ice layer condenses, the control system automatically switches to the ice storage working condition, and the control flow is the same as the working condition 1.

Referring to fig. 3-4, the operating principle of the micro-tube evaporation system 9 as the core component in the ice-making cold-storage system is as follows:

the optimal ice layer thickness for static ice making by the immersion evaporator is about 4.5cm, and the supercooling degree of ice blocks is about-1.5 ℃. The microtube evaporation system disclosed by the invention adopts a tube fin type structure as shown in fig. 2, a refrigerant microtube 91 is made of copper, the inner diameter is 8.52mm, the wall thickness is 1mm, threads are arranged in the tube, a fin 92 is an aluminum fin with the thickness of 1mm, the distance between the fin 92 and the adjacent refrigerant microtube 91 is 3cm in the x-axis direction and the y-axis direction, and the distance between the fins 92 is 5cm in the z-axis direction. The refrigerant flows in the refrigerant microtubes 91, the fins 92 enhance energy transfer, and the ice layer is condensed around the refrigerant microtubes 91 and is condensed into cylindrical ice blocks around the refrigerant microtubes 91. The photovoltaic direct-drive refrigeration system is adopted to operate for 8 hours, the icing thickness is 4.5cm, the icing weight per unit micro-tube length is 7.06kg/m through calculation, and the total lengths of the micro-tubes adopted by the refrigeration units with different sizes are shown in the table 1:

TABLE 1

Refrigerating unit	Ice making quantity/kg	Total microtube length/m
			3 pieces of	373	52.83
4 pieces of	584	82.72
			5 pieces of	758	107.37
6 pieces of	999	141.50

The refrigerant adopts R22, the latent heat of vaporization of R22 obtained by table lookup at-10 ℃ is 213.132kJ/kg, and the flow of the liquid refrigerant in a single microtube is 0.3853g/s by calculation to achieve the refrigeration effect in the table 1. According to the calculation result, the number of the optimized microtubes and the length of a single microtube of the immersion type static ice-making microtube evaporator applied to the distributed photovoltaic direct-drive ice storage air-conditioning system are obtained, and are shown in table 2:

TABLE 2

The immersion type static ice making microtube evaporator applied to the distributed photovoltaic direct-drive ice storage air conditioning system is as shown in table 3:

TABLE 3

Referring to fig. 5-14, the operation of the core confluence system 10 in the ice making cold storage system is as follows:

the 3-piece set is used for analysis, the evaporator module adopted by the 3-piece set is formed by connecting two 10 x 4 micro-tube evaporators in parallel, and in order to ensure the refrigerant flow in each refrigerant micro-tube to be balanced, the invention provides that the confluence devices of the inlet and the outlet of the 10 x 4 micro-tube evaporator are designed, as shown in fig. 5-14. (the micro-tube evaporator is composed of a plurality of refrigerant micro-tubes, the refrigerant micro-tubes are single tubes, the micro-tube evaporator is composed of a plurality of refrigerant micro-tubes which are connected in parallel.)

In the design process, each 10 x 4 micro-tube evaporator is divided into 4 rows, each two rows form a group and share one evaporator gas collecting tube and one evaporator liquid distributing tube, 2 in total, a micro-tube gas collecting tube is adopted for connecting a micro-tube gas exhaust port and the evaporator gas collecting tube, and an evaporator liquid distributing branch tube is adopted for connecting a micro-tube inlet and an evaporator liquid distributing tube.

In fig. 5, "i, ii, iii, iv" indicates the row number of a 10 x 4 microtube evaporator, where each row has 10 microtubes, "v, vi, vii, viii" indicates the row number of another 10 x 4 microtube evaporator, "1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20" in fig. 5-9 indicates the microtubes of the microtube evaporator with the evaporator header ①, and the other microtube evaporators with the evaporator header ②, which are of the same length, material, diameter and connection as the header of the evaporator with the evaporator header ②, thus the description of the positions of the evaporator with the evaporator is the same as the positions of the microtubes of the evaporator with the header ④, and the description of the evaporator with the header 366, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20 "indicates the angles of the evaporator with the header 639, 9, 11, 12, 13, 14, 15, 16, 17, 18, 9, 7, 9, and 7, 9, 7, 9

And

then the evaporator manifold where the evaporator manifolds of the two micro-tube evaporators numbered "①, ②, ③ and ④" are connected to the manifold.

Fig. 6 shows the length of insertion of the microtube header, numbered "1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20", into the evaporator header ① and the angle of the contact surface with the evaporator header, where 1 and 11, 2 and 12, 3 and 13, 4 and 14, 5 and 15, 6 and 16, 7 and 17, 8 and 18, 9 and 19, 10 and 20 with respect to the evaporator headerThe cylindrical center line of tube ① is symmetrical, where 1 and 10, 2 and 9, 3 and 8, 4 and 7, 5 and 6, 11 and 20, 12 and 19, 13 and 18, 14 and 17, 15 and 16 are about the evaporator manifold inserted into evaporator manifold ①

Symmetry, i.e.:

the included angles of the contact surfaces of the micro-tube

gas collecting tubes

1, 10, 11 and 20 and the evaporator gas collecting tube ① are 15 degrees, and the insertion depth is 0 mm;

the included angles of the contact surfaces of the micro-tube

gas collecting tubes

2, 9, 12 and 19 and the evaporator gas collecting tube ① are 30 degrees, and the insertion depth is 1 mm;

the included angle of the contact surface of the micro-tube

gas collecting tubes

3, 8, 13 and 18 and the evaporator gas collecting tube ① is 45 degrees, and the insertion depth is 2 mm;

the included angles of the contact surfaces of the micro-tube

gas collecting tubes

4, 7, 14 and 17 and the evaporator gas collecting tube ① are 60 degrees, and the insertion depth is 3 mm;

the included angle of the contact surface of the micro-tube

gas collecting tubes

5, 6, 15 and 16 and the evaporator gas collecting tube ① is 75 degrees, and the insertion depth is 4 mm.

FIG. 7 is a sectional view showing the distribution of the positions of the microtubes and gas headers of the 10X 4 microtubes evaporator on the surfaces of the heat collecting tubes of the evaporator, and it can be seen from FIG. 7 that the evaporator manifold ① is connected to the gas headers of the evaporator

In the center, 1 and 10, 2 and 9, 3 and 8, 4 and 7, 5 and 6, 11 and 20, 12 and 19, 13 and 18, 14 and 17, 15 and 16 with respect to the evaporator manifold inserted into the evaporator manifold ①

Therefore, the micro-tube header 1 and the micro-tube header 10 are distributed at the same positions on the surface of the evaporator heat collecting tube ①, and similarly, 2 and 9, 3 and 8, 4 and 7, 5 and 6, 11 and 20, 12 and 19, 13 and 18, 14 and 17, 15 and 16 are distributed at the same positions on the surface of the evaporator heat collecting tube ①, and the positions "1, 10" and "11, 20", "2, 9" and "12, 19", "3, 8" and "13, 18", "4, 7" and "14, 17" and "5, 6" and "15, 16" are related to the positions on the cross-sectional view passing throughThe heavy verticality of the evaporator gas collecting tube circular points is symmetrical, namely:

on the cross-sectional view, the included angle between the connecting line of the

positions

1, 10, 11 and 20 and the cross-sectional view circular points of the evaporator gas collecting tube and the plumb line passing through the circular points of the evaporator gas collecting tube on the cross-sectional view is 15 degrees;

the included angle between the connecting line of the

positions

2, 9, 12 and 19 and the circle point of the cross section of the evaporator gas collecting pipe and the plumb line passing through the circle point of the evaporator gas collecting pipe on the cross section is 30 degrees;

the included angle between the connecting line of the

positions

3, 8, 13 and 18 and the circle point of the cross section of the evaporator gas collecting pipe and the plumb line passing through the circle point of the evaporator gas collecting pipe on the cross section is 45 degrees;

the included angle between the connecting line of the

positions

4, 7, 14 and 17 and the circle point of the cross section of the evaporator gas collecting pipe and the plumb line passing through the circle point of the evaporator gas collecting pipe on the cross section is 60 degrees;

the connecting lines of the positions '5, 6, 15 and 16' and the dots of the cross-sectional view of the evaporator gas collecting tube form an angle of 75 degrees with the plumb line passing through the dots of the evaporator gas collecting tube on the cross-sectional view.

FIG. 8 is numbered as

And

the length of the evaporator collecting pipe inserted into the gas collecting main pipe and the included angle between the evaporator collecting pipe and the contact surface of the gas collecting main pipe, wherein

And

and

symmetrical about the cylindrical center line of the gas collection header, namely:

evaporator collecting pipe

And

the included angle between the contact surface of the gas collecting main pipe and the contact surface of the gas collecting main pipe is 15 degrees, and the insertion depth is 0 mm;

manifold of micro-tube evaporator

And

the included angle between the gas collecting main pipe and the contact surface of the gas collecting main pipe is 30 degrees, and the insertion depth is 1 mm.

FIG. 9 is a sectional view of the evaporator manifold of a 10X 4 microtube evaporator in position over the surface of the gas collection manifold, as can be seen in FIG. 9

And

and

symmetry about a heavy vertical line passing through the gas manifold dots on the cross-sectional view, namely:

in cross-section, position

And

the included angle between the connecting line of the cross-sectional diagram circular point of the gas collection header pipe and the plumb line passing through the circular point of the gas collection header pipe on the cross-sectional diagram is 15 degrees;

position of

And

the included angle between the connecting line of the cross-sectional diagram circle point of the gas collection manifold and the plumb line passing through the cross-sectional diagram circle point of the gas collection manifold is 30 degrees.

The micro-tube evaporator is vertically and statically placed in the cold accumulation device, so that the upper end of the vertical micro-tube is an exhaust port, the lower end of the vertical micro-tube is a micro-tube inlet, the evaporator liquid distribution branch pipe and the liquid distribution main pipe in the figure 10 correspond to the micro-tube exhaust port, the micro-tube heat collection pipe, the evaporator gas collection pipe, the evaporator collecting pipe and the gas collection main pipe in the figure 5 respectively, only the flow directions of working media in the tubes are opposite, the refrigerant in the liquid distribution main pipe in the figure 10 flows in, and the refrigerant in the. Thus:

corresponding to the microtube heat collecting tubes numbered "1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20", are evaporator liquid separating branch tubes numbered "1 ', 2', 3 ', 4', 5 ', 6', 7 ', 8', 9 ', 10', 11 ', 12', 13 ', 14', 15 ', 16', 17 ', 18', 19 ', 20';

corresponding to the evaporator gas collecting pipes with numbers of ①, ②, ③ and ④ are evaporator liquid separating pipes with numbers of ① ', ②', ③ 'and ④';

and variations of

The collector tube of the evaporator is correspondingly changed into

And liquid separating branch pipes.

FIG. 11 shows the length of the branch tubes of the evaporator liquid separator, numbered "1 ', 2', 3 ', 4', 5 ', 6', 7 ', 8', 9 ', 10', 11 ', 12', 13 ', 14', 15 ', 16', 17 ', 18', 19 ', 20', inserted into the liquid separator ① 'of the evaporator and the included angle between the contact surfaces of the branch tubes of the evaporator, wherein 1' is equal to 1 'and 1' is equal to the contact surface of the branch tubes of the evaporator11 ', 2 ' and 12 ', 3 ' and 13 ', 4 ' and 14 ', 5 ' and 15 ', 6 ', 16 ', 7 ' and 17 ', 8 ' and 18 ', 9 ' and 19 ', 10 ' and 20 ' are symmetrical about the center line of the evaporator liquid separating tube ① ', wherein 1 ' and 10 ', 2 ' and 9 ', 3 ' and 8 ', 4 ' and 7 ', 5 ' and 6 ', 11 ' and 20 ', 12 ' and 19 ', 13 ' and 18 ', 14 ' and 17 ', 15 ' and 16 ' are symmetrical about the center line of the evaporator liquid separating tube ① ' inserted into the evaporator liquid separating tube

Symmetry, i.e.:

the included angles of the contact surfaces of the liquid separating branch pipes 1 ', 10 ', 11 ' and 20 ' of the evaporator and the liquid separating pipe ① ' are 15 degrees, and the insertion depth is 0 mm;

the included angles of the contact surfaces of the liquid separating branch pipes 2 ', 9 ', 12 ' and 19 ' of the evaporator and the liquid separating pipe ① ' are 30 degrees, and the insertion depth is 1 mm;

the included angles of the contact surfaces of the liquid separating branch pipes 3 ', 8 ', 13 ' and 18 ' of the evaporator and the liquid separating pipe ① ' are 45 degrees, and the insertion depth is 2 mm;

the included angles of the contact surfaces of the liquid separating branch pipes 4 ', 7 ', 14 ' and 17 ' of the evaporator and the liquid separating pipe ① ' are 60 degrees, and the insertion depth is 3 mm;

the included angles of the contact surfaces of the liquid separating branch pipes 5 ', 6 ', 15 ' and 16 ' of the evaporator and the liquid separating pipe ① ' are 75 degrees, and the insertion depth is 4 mm.

FIG. 12 is a sectional view showing the distribution of the evaporator liquid-separating branch tubes of a 10X 4 micro-tube evaporator at the surface of the evaporator liquid-separating tube, and it can be seen from FIG. 12 that the liquid-separating branch tubes connected to the evaporator liquid-separating tube ①

In the center, the liquid separating branches 1 ' and 10 ', 2 ' and 9 ', 3 ' and 8 ', 4 ' and 7 ', 5 ' and 6 ', 11 ' and 20 ', 12 ' and 19 ', 13 ' and 18 ', 14 ' and 17 ', 15 ' and 16 ' are related to the liquid separating pipe ① ' of the evaporator

Symmetrically, therefore, the evaporator liquid separating branches 1 and 10 are distributed at the same positions on the surface of the evaporator liquid separating tube ① ', and similarly, 2 ' and 9 ', 3 ' and 8 ', 4 ' and 7 ', 5 ' and 6 ', 11 ' and 20 ', 12 ' and 19 ', 13 ' and 18 ', 14 ' and 17 ', 15 ' and 16 ' are evaporatedThe surface positions of the liquid distributing tubes ① ' are distributed in the same manner, and the positions "1 ', 10" and "11 ', 20", "2 ', 9" and "12 ', 19", "3 ', 8" and "13 ', 18", "4 ', 7" and "14 ', 17" and "5 ', 6" and "15 ', 16" are symmetrical with respect to a heavy vertical line passing through the liquid distributing tube dots of the evaporator on the cross section, that is:

on the sectional view, the included angle between the connecting line of the positions ' 1 ', 10 ', 11 ' and 20 ' and the cross-sectional view dots of the liquid distribution pipe of the evaporator and the plumb line passing through the cross-sectional view dots of the liquid distribution pipe of the evaporator is 15 degrees;

the included angle between the connecting lines of the positions 2 ', 9', 12 'and 19' and the cross-sectional view dots of the liquid distribution pipe of the evaporator and the plumb line passing through the cross-sectional view dots of the liquid distribution pipe of the evaporator is 30 degrees;

the included angle between the connecting line of the positions 3 ', 8', 13 'and 18' and the cross-sectional diagram dots of the liquid distribution pipe of the evaporator and the plumb line passing through the cross-sectional diagram dots of the liquid distribution pipe of the evaporator is 45 degrees;

the included angle between the connecting line of the positions 4 ', 7', 14 'and 17' and the cross-sectional diagram dots of the liquid distribution pipe of the evaporator and the plumb line passing through the cross-sectional diagram dots of the liquid distribution pipe of the evaporator is 60 degrees;

the included angle between the connecting lines of the positions 5 ', 6', 15 'and 16' and the cross-sectional view dots of the liquid distribution pipe of the evaporator and the plumb line passing through the cross-sectional view dots of the liquid distribution pipe of the evaporator is 75 degrees.

FIG. 13 is numbered as

And

the length of the branch liquid pipes inserted into the branch liquid main pipe and the included angle between the branch liquid pipes and the contact surface of the gas collecting main pipe are included, wherein

And

and

symmetrical about the cylindrical center line of the liquid distribution header pipe, namely:

liquid separating branch pipe

And

the included angle between the main pipe and the contact surface of the main pipe for liquid separation is 15 degrees, and the insertion depth is 0 mm;

liquid separating branch pipe

And

the included angle between the main pipe and the contact surface of the liquid separation pipe is 30 degrees, and the insertion depth is 1 mm.

FIG. 14 is a sectional view showing the distribution of the positions of branch liquid tubes on the surface of a liquid-separating header pipe in a 10X 4 micro-tube evaporator, and the branch liquid tubes are shown in FIG. 14

And

and

symmetry about a heavy vertical line passing through the dots of the dispensing manifold on the cross-sectional view, namely:

in cross-section, position

And

the included angle between the connecting line of the circle point of the section diagram of the liquid distribution manifold and the plumb line passing through the circle point of the liquid distribution manifold on the section diagram is 15 degrees;

position of

And

and the included angle between the connecting line of the dot of the cross section of the liquid-separating manifold and the plumb line passing through the dot of the liquid-separating manifold on the cross section is 30 degrees.

The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. The device disclosed by the embodiment corresponds to the method disclosed by the embodiment, so that the description is simple, and the relevant points can be referred to the method part for description.

The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. Distributed photovoltaic efficient direct-drive multi-connected micro-tube evaporator static ice storage air conditioning system is characterized by comprising:

the ice-making and cold-storage system comprises a variable frequency compressor controlled by the inverse control integrated machine to operate, and a condenser, a throttling and shunting system, a microtube evaporation system, a confluence system and a gas-liquid separator which are sequentially communicated with the variable frequency compressor, wherein the gas-liquid separator is communicated with the variable frequency compressor to form a refrigeration cycle; the microtube evaporation system and the confluence system are positioned in the ice storage barrel;

2. The static ice storage air-conditioning system of the distributed photovoltaic high-efficiency direct-drive multi-connected micro-tube evaporator is characterized in that an MPPT controller is arranged in the inverse control all-in-one machine.

3. The static ice storage air-conditioning system of the distributed photovoltaic high-efficiency direct-drive multi-connected micro-tube evaporator as claimed in claim 1, wherein the ice making storage system and the cold exchange and supply system adopt a variable frequency driving mode.

4. The distributed photovoltaic high-efficiency direct-drive multi-connected micro-tube evaporator static ice storage air-conditioning system as claimed in claim 1, wherein the sensors comprise a wind speed sensor for measuring wind speed, a solar irradiation intensity sensor for measuring total irradiance, a distributed photovoltaic array output performance sensor for measuring direct current voltage, direct current and power generated by the distributed photovoltaic array, a temperature sensor for measuring temperature, an alternating current voltage sensor for measuring operating voltage of the variable frequency water pump and the fan coil set, an alternating current sensor for measuring operating current of the variable frequency water pump and the fan coil set and a frequency sensor for measuring operating frequency of the variable frequency water pump and the fan coil set.

5. The distributed photovoltaic high-efficiency direct-drive multi-connected micro-tube evaporator static ice storage air-conditioning system as claimed in claim 4, wherein the distributed photovoltaic energy system further comprises an anemometer for recording wind speed around the distributed photovoltaic array and a total radiation meter for recording total radiation value of the surface of the distributed photovoltaic array;

6. The static ice storage air-conditioning system of the distributed photovoltaic high-efficiency direct-drive multi-connected micro-tube evaporator is characterized in that the variable frequency compressor, the confluence system, the condenser, the throttling and shunting system, the ice storage barrel and the fan coil unit are all connected with temperature probes, and the temperature probes are electrically connected with the temperature sensors;