Industrial cold storage
There are two types of industrial cold storage.
Industrial cold storage below zero
Industrial cold storage above zero
Cold room above zero: Cold rooms whose temperature is above zero are suitable for storing food at a temperature higher than freezing. In fact, non-freezing foods are stored in the refrigerator above zero. The normal temperature of these cold stores is between 0 and 4 degrees. Fruits, vegetables and fresh dairy products such as milk, buttermilk and yogurt and fresh meat are among the foods that are stored in these cold stores. Sub-zero cold storage: Sub-zero cold storage, which is also known as freezing refrigerator, is used to freeze products such as meat, chicken, fish, vegetables and frozen vegetables. The temperature of the subzero cold room is set between 12 and 23 degrees below zero.
Two circuits refrigerator
The double-circulation cold store has the same performance as both below-zero and above-zero cold stores. The noteworthy point in this type of cold storage is the use of nano disinfectants to clean the freezer, because re-loading food from below zero to above zero may cause and spread bad odors in the freezer and its surroundings. To preserve products, it is better to use an industrial cold room separately, but from an economic point of view, it is not economical to use separate refrigerators and freezers.
Cooler
A pre-cooler is a space where products and food are kept at high temperatures. The pre-cooler lowers the temperature of the products at a relatively high speed to protect them in the refrigerator-freezer. After the temperature of the products is reduced to the necessary level for preservation and storage in the cold room, finally the products are transferred to the cold room. But it should be noted that moving the products between the pre-cooler and the cold room, as well as the time required to perform this activity, may affect the final quality of the products and their shelf life.
How to produce a good refrigerator?
In order to produce a good refrigerator, you must first have a detailed and complete understanding of its facilities. The compressor is the main and most important part of a refrigerator, whose main task is to compress the gases used. Compression by these compressors increases the gas temperature to a great extent. Scroll and screw compressors are two types of compressors, which are usually used in the refrigeration industry.
The refrigerator condenser
Condenser is one of the other components of the whole refrigerator chiller set, which is located between the compressor and the expansion valve, and its main function is to change the state of gas refrigerant to liquid refrigerant. In fact, the condenser is a heat exchanger that, by cooling the refrigerant with water or air, changes the phase of the refrigerant from gas to liquid, so that the condensation refrigeration cycle continues its thermodynamic process.
Refrigerator evaporator
The cooling device consists of 4 basic parts: condenser unit, evaporator unit, compressor and expansion valve. In a closed circuit, the refrigerant circulates between these four parts through piping and does the work of cooling the air inside the refrigerator. The compressor along with the condenser unit is placed outside the cold room and on a chassis. Refrigerant (Freon gas) starts to move between these components, so that the air inside the cold room is cooled by the evaporator.
Evaporators or blowers are used as coolers inside cold storage rooms. In fact, the evaporators bring the temperature of the cold gas generated by the condenser and the expansion valve into the chamber in a closed network space, and then this cold is spread inside the chamber by blowers.
Chiller and its types
Chiller types
Industrial chiller
Air cooled compression chiller
Different applications of chiller
Different types of chillers are used in building and industrial air conditioning systems.
Chiller's performance in building air conditioning
The chiller is used as a subgroup of the air conditioning system. In the air conditioning system of buildings, cold water created from the cold supplier is introduced into the heat exchanger or air conditioning coil to cool the air flow on the coil. The cooled air is transferred directly or through the channel to the environment that needs cooling. After that, the cold water, or in other words, the carrier fluid that has been heated in the coils during the mentioned steps, moves again in the system to cool down in the chiller during the refrigeration cycle and re-enter the cycle. In air conditioners, latent and sensible heat is transferred from air to circulating water. In this way, the air and humidity inside the room are controlled. These types of chillers are used in air conditioners in different cooling sizes to provide cooling. The temperature of the cold water outlet of the cooling supplier varies between 1.5 and 7 degrees Celsius according to the needs and efficiency of the chillers.
Chiller's performance in the industry
One of the most important industrial uses of chillers is the supply of cold water and any other cold fluid. The main use of chillers in the industry is to cool products and machines. Its general functions include cooling in the plastic industry, injection and blow molding, metalworking and cutting with oil, casting, chemical processing, food and beverage production, cement production, machining, welding facilities, power plant facilities, air Compact, laser and MRI systems mentioned.
How do chillers work?
Chillers work by using four main parts, i.e. compressor, evaporator, condenser and measuring devices. The purpose of the system is to remove heat from a part or place such as mechanical parts of various devices. The heat in these parts damages the correct and effective operation of the devices. The way chillers work is that liquids such as water suck heat from a refrigerant that contains chemicals and heat absorbers, and the refrigerant then transfers the heat to the condenser. By using a cold heat exchanger, the condenser turns air or water into steam, so that it becomes a cold liquid again due to saturation. Sometimes more cooling power is needed, so cooling towers are connected to the heat exchanger. When the refrigerant leaves the condenser, it condenses due to the decrease in temperature to absorb more heat. In fact, it is important that the refrigerant cooler absorbs the heat from inside the system and after the heat exchange, the evaporator starts working to remove the heat. The evaporator absorbs the heat at a pressure lower than the atmosphere, while the refrigerant sends the heat to the condenser, so that it turns into a liquid and then condenses and returns to the heat source.
