Cold storage defrost editing
Due to the frost on the surface of the evaporator in the cold storage, the cooling and conduction of the cooling evaporator (pipe) is hindered, which ultimately affects the cooling effect. When the thickness of the frost layer (ice layer) on the surface of the evaporator reaches a certain level, the refrigeration efficiency even drops below 30%, resulting in a large waste of electrical energy and shortening the service life of the refrigeration system. Therefore, it is necessary to perform the cold storage defrosting operation in an appropriate cycle.
Chinese name cold storage defrosting use cold storage
table of Contents
1 defrost purpose
2 defrost method
3 way choice
4 hot fluoride defrost application
5 one-button hot fluorine defrosting
Defrost purpose editing
1. Improve system cooling efficiency;
2. Guarantee the quality of frozen products in the warehouse;
3. Saving energy;
4. Extend the service life of the cold storage system.
Defrost mode editing
Cold storage defrosting method: hot gas defrosting (hot fluorine defrosting, hot ammonia defrosting), water spray defrosting, electrical defrosting, mechanical (manual) defrosting, etc.
1, hot air defrost
--Applicable to large, medium and small cold storage pipe defrosting directly to the hot high-temperature gaseous condensing agent without entering the evaporator, the evaporator temperature rises, causing the frosting layer and the cold row to melt or then peel off. Hot air melting is economical and reliable, easy to maintain and manage, and its investment and construction are not difficult. However, there are many options for hot air defrosting. The usual method is to send the high pressure and high temperature gas discharged from the compressor into an evaporator to release the heat and defrosting, and let the condensed liquid enter another evaporator to absorb the heat and evaporate into a low temperature and low pressure gas. Go back to the compressor suction to complete a cycle.
2, water spray defrost
--Used in large and medium-sized air coolers for defrosting
Regularly spray the evaporator with normal temperature water to melt the frost layer. Although the defrosting effect of the water spray defrosting is very good, it is more suitable for the air cooler, and it is difficult to operate for the evaporation coil. It is also possible to spray the evaporator with a solution having a higher freezing point temperature, such as 5%---8% concentrated brine, to prevent frost formation.
3, electrical defrost
--Electric heat pipe defrosting is mostly used for medium and small size air coolers; electric heating wire defrosting is mostly used for medium and small cold storage aluminum tube
Electric heating defrosting is simple and easy to use for the cooling fan. However, for the case of the aluminum tube cold storage, the construction difficulty of installing the heating wire for the aluminum fin is not small, and the failure rate is higher in the future, and the maintenance and management difficulty is difficult. Larger, less economical, and relatively safer.
4, mechanical manual defrost
-- Small cold storage pipe defrosting for cold storage pipe manual defrosting is more economical, the most original defrosting method. Larger cold storage is not realistic with manual defrosting. It is difficult to operate upwards, and the physical energy consumption is too fast. The long stay in the library is too long to be harmful to the health of the body. Defrost is not easy to completely remove, which may cause deformation of the evaporator and may even degrade evaporation. The refrigerant caused a refrigerant leakage accident.
Mode selection editing
(fluorine system)
According to the different evaporators of the cold storage, a relatively suitable defrost mode is selected, and the energy consumption, the safety factor of use, and the difficulty of installation operation are further selected.
1. Defrosting method of air cooler
There are electric tube defrosting and water cream available. In areas where water is more convenient, the water-cooling chiller can be selected, and in the water-deficient areas, the chiller that chooses the electric tube defrosting is preferred. Water flushing air coolers are generally deployed in large air conditioning and refrigeration systems.
2. Defrosting method of steel row
There are hot fluoride defrosting and manual defrosting options.
3. Defrosting method of aluminum tube
There are hot fluoride defrosting and electric heating creams to choose from. As aluminum tube evaporators are widely used, the defrost of aluminum tubes has attracted more and more attention from users. Due to the material, the aluminum tube is basically not suitable for use as a steel row. It is easy to use a simple and violent manual mechanical defrosting. Therefore, the defrosting method of the aluminum tube should be selected by electric wire defrosting and hot fluorine defrosting, combined with energy consumption and energy efficiency. And safety and other factors, aluminum tube defrosting should choose hot fluorine defrost.
Hot Fluoride Defrost Application Editor
A Freon flow conversion device developed according to the principle of hot gas defrosting, or a set of conversion system composed of a plurality of solenoid valves (hand valves), that is, a refrigerant regulating station, can realize the application of cold storage thermal defrosting.
1, manual adjustment station
It is widely used in large refrigeration systems such as in-line.
2, hot fluorine conversion equipment
It is mostly used in small and medium-sized single-machine refrigeration systems. Such as: one-button hot fluorine defrosting conversion device
One-click hot fluorine defrosting editing
Independent circulation system for single compressors (not suitable for connection installation of parallel, multi-stage, cascade units). It is used in the defrosting of small and medium-sized cold storage pipes in the refrigeration and refrigeration industry, and defrosting in the ice industry.
Characteristics
1, manual control, one-click conversion.
2, from the internal heating, the combination of frost layer and tube wall can be melted, the energy efficiency ratio is 1:2.5.
3, defrosting thoroughly, more than 80% of the frost layer is solid.
4, according to the map directly installed on the condensing unit, no other special accessories.
5, according to the actual temperature and other actual differences, generally used 30 to 150 minutes.
One-button hot fluorine defrosting installation diagram
One-button hot fluorine defrosting installation diagram
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