For long-term use of cold storage room, various technical indicators must be checked regularly and adjusted in time. The operating temperature and pressure of the cold storage system, as well as the amount of lubricating oil and refrigerant, must be checked and adjusted in time. The system should have automatic control and compressor alarm devices. Once there is a problem, an alarm will be issued, or an automatic protective shutdown and the compressor will stop. Here are 7 common problems and solutions for the use of cold storage room.      1. The installation environment and maintenance of the air coolerThe location and environment of the air cooler inside the cold storage will affect its operation. Generally, the air cooler near the cold storage door is prone to condensation and frost. Although the air cooler can automatically heat and defrost at regular intervals, if the door is opened too frequently, the opening time is too long, the time and quantity of hot air entering is long, the defrosting effect of the fan is not good. Because the defrosting time of the air cooler cannot be too long, otherwise the cooling time will be relatively shortened, the cooling effect will not be good, and the storage temperature cannot be guaranteed.Kogamaru       2. Drainage of the melted water during the defrosting of the air cooler　　This problem is related to the severity of the frosting. Due to the severe frosting of the fan, a large amount of condensate will inevitably be produced. The fan's drain pan cannot bear it, and the drainage is not smooth, and it will leak and flow to the ground in the warehouse. If there are goods stored below, the goods will be soaked. In this case, a thicker draft tube can be installed to remove the condensate.　　Some air coolers have the problem of blowing water from the fan and spraying it on the stock in the warehouse. This is also the frosting problem of the fan in the cold and heat exchange environment, mainly due to the condensate generated by the fan leaf in the hot environment, rather than the problem of the defrosting effect of the fan itself.　　3.the problem of the condenser fan motor and the electric heating tube of the air cooler　　 This is a vulnerable part. The fan motor that runs for a long time in a high temperature environment may malfunction and be damaged. If the guaranteed temperature of the cold storage is very important, some vulnerable parts should be ordered for timely maintenance.　　4. the ambient temperature of the condenser　　The condenser is generally installed on the roof of an outdoor building. In an environment with a high temperature in summer, the temperature of the condenser itself is very high, which increases the operating pressure of the unit. If there is a lot of hot weather, you can add a pergola on the roof condensation to block the sun and reduce the temperature of the condenser, so as to reduce the pressure of the machine, protect the unit equipment, and ensure the temperature of the cold storage. Of course, if the unit capacity is sufficient to ensure the storage temperature, there is no need to build a pergola.　　　 5. The problem of low compressor efficiency　　 Due to the long-term operation of the compressor, the cylinder liner, piston ring and other parts will be severely worn and the fit clearance will increase. The sealing performance will be correspondingly reduced. The compressor's air delivery coefficient will also be reduced, and the cooling capacity will be reduced. The refrigeration capacity of the compressor can be roughly judged by observing the suction and discharge pressure of the compressor. If the refrigeration capacity of the compressor drops, the common method is to replace the cylinder liner and piston ring of the compressor.　　 6. there is a problem of more air or refrigerated oil in the cold storage evaporatorOnce more refrigerating oil is attached to the inner surface of the heat transfer tube of the cold storage evaporator, its heat transfer coefficient will decrease. Similarly, if there is more air in the heat transfer tube, the heat transfer area of the evaporator will decrease, and its heat transfer coefficient will decrease. The thermal efficiency will also drop significantly, and the temperature drop rate of the warehouse will slow down accordingly. Therefore, in daily operation and maintenance, attention should be paid to timely removing oil stains on the inner surface of the heat transfer tube of the evaporator and exhausting the air in the evaporator.　　7. the cold storage throttle valve is improperly adjusted or blocked, the refrigerant flow is too large or too smallWhen the throttle valve is opened too large, the refrigerant flow is too large, and the evaporating pressure and evaporating temperature will also increase, and the temperature drop rate of the warehouse will slow down; at the same time, when the throttle valve is opened too small or blocked, the refrigerant The flow rate also decreases, the cooling capacity of the system also decreases, and the temperature drop rate of the warehouse will also slow down.　　 Generally, it can be judged whether the refrigerant flow rate of the throttle valve is appropriate by observing the evaporating pressure, evaporating temperature and frosting of the suction pipe. To Clogging is an important factor that affects the flow of refrigerant. The main cause of throttling valve blockage is ice blockage and dirty blockage.　　Ice blockage is due to the poor drying effect of the dryer. The refrigerant contains moisture. When it flows through the throttle valve, the temperature drops below 0°C. The moisture in the refrigerant freezes and blocks the throttle valve hole.　　 Dirty blockage is caused by the accumulation of more dirt on the inlet filter of the throttle valve, and the flow of refrigerant is not smooth, resulting in blockage.

         Potato cold storage preservation technology mainly includes three aspects: pre-harvest management, cold storage storage period management and delivery management. Let's learn about the temperature of the potato cold storage room and the precautions for management in the storage.         1. Temperature, humidity and gas composition management of potato cold storage　　 Cold storage fresh-keeping potatoes (potatoes) can be stored in fresh-keeping warehouses or controlled atmosphere warehouses. The temperature and humidity standards of potato (potato) fresh-keeping cold storage are as follows:　　 (1) Temperature management　　 Fresh-keeping cold storage or air-conditioning temperature is 3℃~5℃.The storage temperature is required to reach the specified storage temperature within 48 hours, and the storage temperature must be stable during the entire storage period and the fluctuation should not exceed ±1°C.        When the temperature is higher than 5°C, individual molds start to move, and when the temperature is 8～11°C, the tuber respiration is strong, the fungus multiplies rapidly, and the tuber is prone to rot.　　 When the temperature is 0～1℃, the starch in the potato chunks begins to be converted into sugar, the taste becomes sweeter, and the seed potatoes deteriorate; when the temperature is lower than -1℃, the potato chunks are frozen, and then a lot of rot.　　 (2) Relative humidity management　　The relative humidity of the potato cold storage is kept at 80%～90%.　　 If the humidity is higher than this, the potato pieces are easy to rot and germinate early; if the degree is too low, the potato pieces are easy to lose water, lose weight, become soft and shrink, and lose their edible and seed value.　　 (3) Management of gas environment in potato cold storageThe gas environment of the potato cold storage will affect the storage effect of potatoes. The management recommendations are as follows:Benzathine penicillin: long-acting penicillin　　①Gas environment management of potato fresh-keeping cold storage　　 The potato fresh-keeping warehouse is a relatively sealed environment, after being stored in the warehouse for a period of time.　　 Due to the respiration of the potato itself, the concentration of carbon dioxide in the reservoir will increase and the gas will become turbid.　　Excessively high concentrations of carbon dioxide can cause "poisoning" of potatoes and even rot and deterioration of potatoes.　　 Therefore, it is recommended to ventilate the warehouse body, and choose the morning or evening when the temperature is lower. The warehouse is usually ventilated at least once a week.　　②Gas environment management of potato controlled atmosphere storageThe gas environment of the potato controlled atmosphere storage is recommended to be controlled as: oxygen concentration 3%~5%, carbon dioxide concentration 2%~3%.　　 The respiration of potatoes is still going on after harvesting. Potatoes with too low oxygen content will be hypoxic. In some cases, they will lose their germination ability, and in severe cases, they will cause suffocating rot.　　 The appropriate concentration of carbon dioxide concentration can also slow down the respiration of fresh potatoes, which can effectively delayThe priming effect of breathing jumps.　　 But the carbon dioxide concentration can not be too high, too high carbon dioxide will cause potatoes to be forced to undergo "anaerobic respiration".　　 refers to the process in which the respiratory substrate of potatoes cannot be completely oxidized under hypoxic conditions to produce alcohol, aldehyde, lactic acid and other products, and at the same time release a small amount of energy. The reaction equation is as follows:　　 Anaerobic respiration is not good for potato storage, it will consume more nutrients stored in potatoes and accelerate the aging of fruits and vegetables.In addition to controlling the carbon dioxide and oxygen components, the air conditioning warehouse also controls the concentration of ethylene. Ethylene can quickly increase the respiratory intensity of potatoes and accelerate the ripening of potatoes. The ethylene removal machine of the air conditioning warehouse can control and reduce the concentration of ethylene.　　 (1) During the storage period, samples should be checked regularly to check whether the potatoes (potatoes) have disease, cold damage, color change, water loss and rot, and remove them in time if they are abnormal.(2) The fresh-keeping warehouse should be well ventilated, which should be carried out at least once a week due to the temperature drop or in the evening.　　 2. Potato delivery management　　 After the cold storage storage period is over, the following three points need to be paid attention to when potatoes are shipped out of the warehouse:　　The potatoes out of the warehouse should be slowly warmed up to prevent the dew and deterioration of the potatoes caused by the excessive temperature difference;　　Attention during handling: handle, put, and move gently to avoid mechanical damage;　　Cold chain transportation should be implemented for medium and long-distance transportation, and normal temperature transportation can be selected for medium- and short-distance transportation.

News headlines reported from time to time that a certain ammonia machine cold storage had a leak and how many casualties were lost. Behind these shocking cases, in addition to some human factors, the problems of the ammonia refrigeration system itself are also the reason for the necessity of changing ammonia to fluorine. At present, the biggest problems facing the safety of ammonia refrigeration safety of ice machines in some international countries come from both human and material aspects. However, many cold storages built in the 1950s are still in use. These cold storages have aging equipment, outdated materials, and simple designs. Some cold storages are not only located in densely populated areas, but even close to residential areas, which have long been incompatible with current production needs. In many major accidents involving ammonia, human irregular operations are often one of the most important factors causing the accident.At present, the certificated employment rate of ammonia refrigeration professionals in some areas is very low, and many operators do not have the most basic operating knowledge. At the same time, due to the rapid development of cold chain infrastructure construction, many policies and regulations related to the safety of ammonia refrigeration systems have been unable to keep up with the current market development. In addition, the ammonia refrigeration system of the industrial ice maker uses liquid ammonia as the main refrigerant, which has certain harmfulness. 1. Easy to spreadThe vaporized liquid ammonia is atomized in the vapor in the form of droplets; at the beginning of the leakage, due to the partial evaporation of the liquid ammonia, the density of the ammonia vapor cloud is higher than the air density, and the ammonia gas drifts with the wind, which is easy to form a large area of pollution. Poisonous zone and combustion explosion zone.2. Easily poisonedAmmonia is toxic, it is a irritating and foul-smelling gas, and it is easily volatilized. When ammonia leaks into the atmosphere and spreads to a certain range, it is easy to cause acute poisoning and burns. The main pathways for ammonia to invade the human body are the skin, sensory organs, respiratory tract and digestive tract. The symptoms of mild poisoning are: dry eyes, watery eyes, runny nose, cough, hoarse voice, difficulty swallowing food, dizziness and pain, eye membrane congestion and swelling can be seen during examination, a few dry rales can be heard in the lungs; severe Symptoms of poisoning are: under the action of high concentration of ammonia, the exposed parts of the head and face may cause severe second-degree chemical burns, coma, confusion, convulsions, myocarditis or heart failure, and a small number of reflex sounds. Portal spasm or respiratory arrest was electrocuted death.3. Easy to burn and explodeAmmonia is both a toxic gas and a combustible gas. The self-ignition point of ammonia is 651°C, the combustion value is 2.37-2.51J/m3, the critical temperature is 132.5°C, and the critical pressure is 11.4Mpa. When the content of ammonia in the air reaches 11-14%, it can burn when exposed to an open flame. The flame is yellow-green. When oil is present, it will increase the risk of combustion; when the content of ammonia in the air reaches 15.7%-27.4%, Exposure to a fire source will cause an explosion, with a flammable concentration of 17%, resulting in a large explosion pressure of 0.58Mpa; the liquid ammonia container will expand when heated, and the pressure will rise, which can cause the cylinder or storage tank to explode.4. Easily pollute the environmentAmmonia can pollute the air. Under the action of wind, this toxic gas drifts with the wind, causing extensive air pollution and harming humans and animals. If a large amount of liquid ammonia leaks into rivers, lakes, reservoirs and other waters, it will cause water pollution. In severe cases, the water in the water area cannot be used without treatment.5. Prone to secondary accidentsAmmonia is unstable and decomposes when exposed to heat. It will cause a violent chemical reaction when it comes in contact with fluorine and chlorine. If exposed to high heat, the internal pressure of the container will increase and there is a danger of cracking and explosion.Guangzhou Bingquan Refrigeration specializes in undertaking various ammonia-to-fluorine project projects. It has a professional design team, its own factory, and after-sales guarantees. It has now provided professional services for many refrigeration businesses across the country. For more wonderful sharing of Bingquan Ammonia to Fluorine Cases, please keep paying attention to Bingquan Refrigeration!

Fresh-keeping cold storage room is often used to store vegetables and fruits and other perishable fresh products, improve the quality and flavor and extend the delivery time, thereby realizing the improvement of economic benefits. Generally speaking, the temperature of the fresh-keeping cold storage is set to 0~5℃, but in actual use, it should be adjusted according to the types of vegetables and fruits stored. Only by setting the most suitable storage temperature can the economic benefits of the cold storage be maximized. Bingquan has compiled the fresh-keeping cold storage temperatures of several common types of vegetables, in order of root vegetables, leafy vegetables, melons and vegetables, solanaceous fruits, edible fungi and vegetable beans.       Root vegetables preservation temperature  Root vegetables: garlic sprouts, garlic, long yam, potatoes, horseradish, turnips, carrots, radishes, bamboo shoots, asparagus, celery, fresh-keeping temperature is 0-5 ℃. For flat yam, ginger, sweet potato, and taro, the vegetables cold room temperature is 0-15℃.   Leafy vegetables preservation temperatureLeafy vegetables: head lettuce, upright lettuce, purple leaf lettuce, rapeseed, milk cabbage, spinach (point leaf type), chrysanthemum chrysanthemum, shallots, leeks, cabbage, brussels sprouts, chicory, Chinese cabbage, Chinese cabbage, Kale, Chinese cabbage, Chinese cabbage, kale, lettuce, parsley, water chestnut, chard, cold storage temperature: 0-3 ℃.  The fresh-keeping temperature of melons and vegetables  Fruit vegetables: Chayote and loofah are kept fresh at 5-10°C; cucumber, pumpkin, winter gourd, winter zucchini (winter squash), dwarf zucchini, and bitter gourd are kept fresh at 10-15°C.  Fresh storage temperature of solanaceous and fruit vegetables cold storage room  Eggplant and fruit vegetables: red ripe tomatoes and sweet corn, fresh-keeping temperature: 0-5℃; eggplant, green ripe tomatoes, green peppers, 9-13℃.  Fresh-keeping temperature of edible fungus vegetables  Edible fungus vegetables: Bailing mushroom, Flammulina velutipes, Pleurotus ostreatus, Shiitake, Agaricus bisporus, the fresh-keeping temperature is: 0-3℃; Straw mushroom fresh-keeping temperature is 11-13℃  Fresh-keeping temperature of legumes for vegetables  Vegetable legumes: sweet beans, snow peas, and peas are kept fresh at 0-3°C; winged beans, lentils, kidney beans, cowpeas, carobs, edamame pods, and kidney beans are kept fresh at 6-12°C.