阅读说明：本技术 采用蓄冷板的小型蓄冷冷库 (Small cold storage house adopting cold storage plate ) 是由 谢晶 游辉 孙锦涛 王金锋 于 2021-07-27 设计创作，主要内容包括：采用蓄冷板的小型蓄冷冷库,包括库体、冷库门、制冷机组、冷风机、蓄冷板、智能控制系统,所述制冷机组与所述蒸发器连接形成制冷回路,所述蓄冷板内充注蓄冷材料,所述智能控制系统与所述制冷机组连接以实现对冷库温度监测,自动维持库温稳定,所述冷库的运行策略为夜间充冷6-12小时,白天释冷12-18小时。本发明通过在蓄冷冷库内均匀设置蓄冷板,结构简单、蓄冷量大、在需要降温的时候释放冷量,使得冷库库体内的温度分布均匀；利用电低谷制冷蓄冷,使制冷机组在峰段时间停止运行,长期运行可节约大量电费,值得推广应用。(The small cold accumulation cold storage adopting the cold accumulation plate comprises a storage body, a cold storage door, a refrigerating unit, an air cooler, the cold accumulation plate and an intelligent control system, wherein the refrigerating unit is connected with the evaporator to form a refrigerating loop, the cold accumulation plate is filled with cold accumulation materials, the intelligent control system is connected with the refrigerating unit to monitor the temperature of the cold storage, the temperature of the cold storage is automatically kept stable, and the operation strategy of the cold storage is that the cold accumulation is carried out for 6-12 hours at night and the cold is released for 12-18 hours in the daytime. The cold accumulation plates are uniformly arranged in the cold accumulation cold storage, so that the cold accumulation cold storage has a simple structure and large cold accumulation amount, and releases cold when the temperature needs to be reduced, so that the temperature in the cold storage is uniformly distributed; the refrigeration and cold accumulation are carried out by utilizing the electricity valley, so that the refrigeration unit stops running in the peak period, a large amount of electricity charges can be saved by long-term running, and the refrigeration system is worthy of popularization and application.)

1. A small cold accumulation cold storage house adopting a cold accumulation plate comprises a storage body, a cold storage door, a refrigerating unit, an air cooler, the cold accumulation plate and an intelligent control system,

the refrigerating unit and the evaporator are connected to form a refrigerating loop,

the cold storage plate is filled with cold storage materials,

the intelligent control system is connected with the refrigerating unit to monitor the temperature of the refrigeration house and automatically maintain the temperature of the refrigeration house to be stable,

the operation strategies of the refrigeration house are that the refrigeration house is charged for 6-12 hours at night and released for 12-18 hours in the day.

2. A small cold storage freezer using cold storage plates as claimed in claim 1, characterized in that the cold storage material is prepared by mixing ethanol solution of 10-20% and ammonium chloride solution of 20-30% in a ratio of 1: 2, and adding 1-5% of sodium alginate and 0.01-0.05% of diatomite, and mixing.

3. A small cold-storage freezer using cold-storage plates according to claim 1, characterized in that the volume of the cold-storage plates filled with cold-storage material is 90% of the volume of the cold-storage plates.

4. A small cold storage freezer using cold storage plates according to claim 1, characterized in that the mass of the cold storage material is determined by calculating the cold load required by different operation strategies of the freezer and the phase change latent heat and density of the cold storage material.

5. The small cold accumulation cold storage warehouse adopting the cold accumulation plate as claimed in claim 1, wherein the cold accumulation plate is horizontally laid and arranged, and is placed at the same height as the air cooler and perpendicular to the outer wall surface of the air cooler, and the plane size and height of the cold accumulation plate are determined by the mass of the cold accumulation material.

6. A small cold storage freezer using cold storage plates according to claim 1, characterized in that the freezer body has a heat insulating layer, a polyurethane foam layer with a thickness of 150 mm; the inner wall and the outer wall of the cold storage body are both stainless steel plates.

7. A small cold storage freezer using cold accumulation plates according to claim 1, characterized in that the freezer door is an automatic door.

8. A cold storage material as claimed in claim 3, wherein the cold storage agent is prepared from a 15% ethanol solution and a 25% ammonium chloride solution in a ratio of 1: 2, and adding 3 percent of sodium alginate and 0.03 percent of diatomite and mixing.

9. The operating strategy according to claim 4, wherein the operating strategy of the freezer is 6 hours for night charge and 18 hours for day discharge.

10. A small-sized cold storage freezer using cold accumulation plates according to claim 1,

the cold storage plate is provided with a cold storage plate, and the cold storage plate is provided with a cold storage plate;

when the temperature of the refrigerator body exceeds a set high-temperature limit value, the intelligent control system sends a unit starting signal to the refrigerating unit, and the unit is started to realize cold supplement on the refrigerator body;

when the temperature of the warehouse body is lower than the set low-temperature limit value, the intelligent control system sends a stop signal to the refrigerating unit and closes the refrigerating unit.

Technical Field

The invention belongs to the technical field of cold accumulation, and particularly relates to a small cold accumulation cold storage house adopting a cold accumulation plate.

Background

In recent years, food quality and safety are receiving more and more attention in order to meet the increasing material requirements of people and the direction of good life, and the preservation and storage of food are always the hot points of research. The yield and consumption of perishable food in China are huge, but the cold chain circulation rate is low, the spoilage rate is high, by 2017, the cold chain circulation rate of vegetables in China is 35%, the cold chain circulation rate of meat is 57%, the cold chain circulation rate of aquatic products is 69%, and the cold chain circulation rate of meat and poultry in developed countries is 100%, and the cold chain circulation rate of fruits and vegetables is more than 95%. The cold chain logistics provide proper temperature and humidity for the storage, transportation and sale of perishable foods, and can greatly reduce the spoilage rate of agricultural products and foods. The cold storage is an important infrastructure for food freezing processing, storage and circulation, is a key point of a cold chain, is rapidly developed in the construction of the cold storage in China at present, and is mainly distributed in main production areas of fruit and vegetable bases in suburbs of large and medium-sized cities. According to data published by the union of logistics and procurement in China in 2019, the total quantity of the refrigerators in China reaches 6052.5 ten thousand tons (1.51 hundred million m), but the quantity of the refrigerators in China is still low until now, the supply and demand of the refrigerators are still insufficient, and the market development of the refrigerators is wide along with the urbanization, the development of fresh electric commerce and fresh food trade. The scale and the number of the cold storage are also rapidly increased, meanwhile, the high energy consumption of the cold storage is a non-negligible problem, and the energy consumption of the cold storage is mainly composed of a refrigerating system.

The normal work of the refrigeration system of the conventional refrigeration house is generally ensured by municipal power supply, so that the refrigeration house is maintained within a set temperature range. However, when the refrigeration system fails to perform normal refrigeration due to power failure or equipment failure, the temperature in the refrigerator gradually rises, which has a great negative effect on the quality of the articles stored in the refrigerator. Therefore, in general, when the refrigeration system cannot perform normal refrigeration, the refrigerator is required to be maintained within a predetermined temperature range for a predetermined time.

The country encourages to use the preferential conditions of the low-ebb electricity price to put into practical use a large amount of low-ebb electricity, such as cold accumulation, heating and other electrical equipment. Meanwhile, for the electric power department, the cold accumulation technology can transfer the peak power consumption to the low ebb period, thereby not only relieving the gap of the peak power supply and demand, but also promoting the optimal allocation of the power resource, and being a win-win strategy of peak clipping and valley filling. However, the conventional cold storage device has some disadvantages in use, such as: the traditional cold accumulation method adopts water for cold accumulation, but the equipment required by the water for cold accumulation has large floor area, small cold accumulation amount and small cold accumulation temperature difference, so that the cold accumulation temperature difference of the traditional water for cold accumulation has smaller application range, lower comprehensive value in industrial production and small application range.

The patent document with publication number CN209263451U discloses a direct cooling type refrigerator capable of storing cold, which stores cold by directly cooling the substance in the water tank by disposing an evaporator in water, has large cold storage amount, and can prolong the heat preservation time of the refrigerator to a greater extent in case of power failure and other needs of cold release. However, the apparatus is complicated in structure and difficult to install.

The traditional cold accumulation cold storage house has the following problems: the cold accumulation part in the cold accumulation type cold storage is connected with the refrigerating system, so that the whole system becomes complicated, and the manufacturing cost of the system is increased; the uniformity of cold accumulation temperature distribution is difficult to ensure, and the cold accumulation performance is poor; therefore, there is a need for improvement on this basis.

Disclosure of Invention

The invention aims to solve the defects of the existing cold accumulation equipment and provide a small cold accumulation type refrigeration house which adopts a cold accumulation plate and has a simple system.

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

a small cold accumulation cold storage house adopting a cold accumulation plate comprises a storage body, a cold storage door, a refrigerating unit, an air cooler, the cold accumulation plate and an intelligent control system,

the refrigerating unit and the evaporator are connected to form a refrigerating loop,

the cold storage plate is filled with cold storage materials,

the intelligent control system is connected with the refrigerating unit to monitor the temperature of the refrigeration house and automatically maintain the temperature of the refrigeration house to be stable,

the operation strategies of the refrigeration house are that the refrigeration house is charged for 6-12 hours at night and released for 12-18 hours in the day.

Preferably, the cold storage material adopts 10-20% ethanol solution and 20-30% ammonium chloride solution, and the ratio of 1: 2, and adding 1-5% of sodium alginate and 0.01-0.05% of diatomite, and mixing.

Preferably, the volume of the cold storage plate filled with the cold storage material is 90% of the volume of the cold storage plate.

The mass of the cold storage material is determined by calculating according to the cold load required by different operation strategies of the refrigeration house and the phase change latent heat and density of the cold storage material.

Preferably, the cold accumulation plates are horizontally laid and arranged and are placed on the outer wall surface of the air cooler at the same height as the air cooler, and the plane size and height of the cold accumulation plates are determined by the mass of the cold accumulation materials.

Preferably, the cold storage body is provided with an insulating layer, and is a polyurethane foam layer with the thickness of 150 mm; the inner wall and the outer wall of the cold storage body are both stainless steel plates.

Preferably, the cold storage door is an automatic door.

Preferably, the cold storage agent is prepared by mixing a 15% ethanol solution and a 25% ammonium chloride solution in a ratio of 1: 2, and adding 3 percent of sodium alginate and 0.03 percent of diatomite and mixing.

Preferably, the operation strategy of the refrigeration house is that the refrigeration house is charged for 6 hours at night and released for 18 hours in the day.

Preferably, the storage body is provided with a temperature sensor, one part of the temperature sensor is arranged in the storage body, and the other part of the temperature sensor is arranged in the cold storage plate;

when the temperature of the refrigerator body exceeds a set high-temperature limit value, the intelligent control system sends a unit starting signal to the refrigerating unit, and the unit is started to realize cold supplement on the refrigerator body; when the temperature of the warehouse body is lower than the set low-temperature limit value, the intelligent control system sends a stop signal to the refrigerating unit and closes the refrigerating unit.

Compared with the prior art, the invention has the following beneficial effects:

(1) the cold accumulation plates are uniformly arranged in the cold accumulation cold storage, so that the cold accumulation cold storage has a simple structure and large cold accumulation amount, and releases cold when the temperature needs to be reduced, and the temperature in the cold storage is uniformly distributed;

(2) the temperature of the cold storage body is detected through the intelligent control system, and when the temperature exceeds a set value, the refrigerating unit automatically realizes a cold supplement function on the cold storage body; the cold storage body is provided with the polyurethane heat-insulating layer and the heat-insulating plate, so that the loss of cold energy can be effectively prevented;

(3) the refrigeration and cold accumulation are carried out by utilizing the electricity valley, so that the refrigeration unit stops running in the peak period, a large amount of electricity charges can be saved by long-term running, and the refrigeration system has certain economic benefit and is suitable for popularization and application.

Drawings

FIG. 1 is a schematic view of a small-sized cold storage warehouse using a cold storage plate according to the present invention

FIG. 2 is a plan view showing the arrangement of cold storage plates of a small cold storage freezer using the cold storage plates according to the present invention

The numbering in the figure is: 1-a cold storage body; 2, an air cooler; 3-cold storage plate; 4-a cold storage door.

Detailed Description

The technical solutions of the present invention are clearly and completely described below with reference to the drawings in the present patent, but the scope of the present invention should not be limited by the preferred examples.

Example 1

As shown in fig. 1, the cold storage refrigerator in the present example is a frozen object refrigerator, and includes: the inner size of the cold storage body is 4.7m multiplied by 3.7m multiplied by 2.9m, the heat insulation plate of the cold storage wall body comprises an upper layer panel, a lower layer panel and a foaming material between the upper layer panel and the lower layer panel, the foaming material is a polyurethane foaming material, and the thickness of the foaming material is 150 mm; the heat-insulating plate has the advantages of heat insulation, durability, no corrosion and the like, and is suitable for being used as a wall body of a refrigeration house; the refrigerating unit is a Mitsubishi vortex direct-current variable-frequency condensing unit ECAV-EP75 YGC; the type of the evaporator, namely an air cooler is Kandator S3HC 218-65; the cold storage material is a self-made mixed solution, and 15% ethanol solution and 25% ammonium chloride solution are mixed according to the proportion of 1: 2,1: 4,1: the proportion of 6 is configured, the actual crystallization temperature of the salt solution is always lower than the theoretical crystallization temperature, the temperature difference is called as supercooling degree, the supercooling degree can increase the energy consumption of a refrigerating unit, when the cold storage material consists of a plurality of groups of different components, freeze-thaw cycle easily causes the separation of all phases of the material, the physical property of the separated compound is deteriorated, the supercooling degree is reduced by adding 0.03% of diatomite as a nucleating agent, the phase separation is improved by adding 3% of sodium alginate, and the phase transition temperature and the phase transition latent heat of each mixed material obtained by using a differential scanning calorimeter are listed as follows:

ratio of solution	1：2	1：4	1：6
				Phase transition temperature (. degree. C.)	-18.26	-16.89	-16.31
Latent heat of phase change (kJ/kg)	265.1	257.6	272.3

As can be seen from the above table, the phase transition temperature of the mixed solution decreases with the increase of the proportion of the ammonium chloride solution, and the proportion is 1: 2 is suitable for placing in a freezer at-18 ℃, in this example 1: 2, the solution density is 1114.29 kg/m³。

The mass of the cold storage material in the embodiment is determined according to the cold load required by the operation calculation of the refrigeration house, the instantaneous cold load of the refrigeration house is 1333.9W, and the cold storage plate of the refrigeration houseIn the 18 h operation strategy of cold release in the daytime peak-to-peak period, the mass of the cold storage material is calculated to be 326.04kg, and the volume of the cold storage material is obtained to be 0.2925 m according to the density calculation³. Considering that the solution density of the cold storage material is 1114.29 kg/m³After cooling and solidification, the density is reduced to 1010.9 kg/m³The volume of the cold storage plate is increased along with the reduction of the density, the cold storage material is only filled in 90% of the volume of the cold storage plate, the size of the cold storage plate is determined to be 605mm multiplied by 358mm multiplied by 35mm, and the cold storage plate and the air cooler unit are uniformly distributed at the same height.

When the refrigeration house normally works, the refrigeration unit is started to provide cold for the refrigeration house to reduce the temperature of the refrigeration house, meanwhile, the cold storage plate absorbs energy to solidify, when the temperature of the refrigeration house reaches the lowest temperature of the refrigeration house and the temperature of the cold storage plate is stable, the refrigeration unit stops working, and when the temperature in the refrigeration house is higher than-18 ℃, the cold storage plate releases energy to keep the temperature in the refrigeration house not to rise greatly, so that the opening time of the refrigeration unit of the refrigeration house is reduced, and the running cost of the refrigeration house is reduced.

Example 2

In the embodiment, the power of the refrigerating unit of the small cold accumulation cold storage is 4 KW. According to the 18-hour operation strategy of the day peak stage cold release of the cold storage refrigerator, the valley period operation time of the refrigerating unit of the cold storage refrigerator is 6 hours, while the refrigerating unit of the refrigerator which does not adopt the cold storage technology operates for 16 hours in the peak period and operates for 8 hours in the valley period. According to the general single industry and business and other electricity consumption in summer in Shanghai, the peak electricity price of less than one kilovolt is 0.853 yuan/degree, and the peak-valley electricity price is 0.423 yuan/degree, the electricity consumption and the cost of the refrigeration house are calculated as follows:

initial investment of cold accumulation cold storage:

as can be seen from the above table, the annual electricity charge of the cold storage without using the cold accumulation technology is 10722.6 yuan, the annual electricity consumption of the cold storage with the cold accumulation material is 6852.6 yuan, and the annual electricity consumption of the small cold accumulation plate cold storage can be saved by 3870 yuan. The initial investment of the earlier stage cold storage material of the phase change cold storage refrigeration house of the embodiment is 16633.44 yuan, the cost of the cold storage material can be recovered after the refrigeration house operates for 4.3 years, the calculation result of the embodiment shows that the refrigeration unit uses the valley section electricity price for the cold storage plate for cold storage at night, the cold storage amount is utilized in the daytime to delay the starting time, the effects of peak clipping, valley filling and electricity charge saving and the actual operation cost of the refrigeration house can be achieved.

The above embodiments are merely illustrative of specific principles and procedures of the present invention, and are not intended to limit the present invention. Any person skilled in the art can modify or change the above examples according to the parameters of a specific experimental bench. Accordingly, it is intended that all equivalent modifications or changes which can be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.