principle of operation
1. The water pump continuously circulates the chilled water in the water storage tank through the plate or grid evaporator;
2. After the compressor is running, it is sucked-compressed-discharged-condensed (liquefied)-throttled-and then evaporated in the evaporator at the low temperature of-10 to-18 degrees. When the water temperature is 0℃, frozen water condenses into ice layer on the evaporator surface at a low temperature. When the ice layer condenses to a certain thickness and the evaporation temperature of the refrigerant reaches the set temperature of temperature control, the defrosting solenoid valve is opened, and the heat pump is often used for deicing, and then the next cycle is realized.
Ice making cycle:
Through the water replenishing valve, water automatically enters the water storage tank, and then the water is pumped to the shunt head through the flow control valve, where the water is evenly sprayed on the surface of the ice maker and flows through the wall of the ice maker like a water curtain, and the water is cooled to freezing point, while the water without evaporation and freezing flows into the water storage tank through the porous tank, and the circulating work starts again.
Ice fetching cycle:
When the ice reaches the required thickness (the thickness can be arbitrarily selected by the operator/user), the hot air discharged from the compressor is led back to the clamping wall of the ice maker to replace the low-temperature liquid refrigerant. In this way, a water film is formed between the ice and the wall of the evaporation tube. When the ice falls freely into the lower tank under the action of gravity, the water film will play a role in lubrication. The water generated in the ice taking cycle will return to the water storage tank through the porous tank, which also prevents the wet ice from being discharged by the machine.
Refrigerator condensation:
It can be realized by air cooling, water cooling or evaporative condenser. The evaporative condenser is installed above the ice maker, the water-cooled condenser is installed below the ice maker or refrigeration system, and the air-cooled condenser can be installed with the ice maker or outdoors according to the actual situation. If necessary, water-cooled condensers can be used on ships or along the coast to be cooled by seawater. Evaporative cooling can be used at high ambient air temperature, but it is not suitable for water-cooling or air-cooling refrigeration from the point of view of efficiency and economy. German Ferguson FOCUSUN, American Wan Li Manitowoc, American Scotes Man Scotsman, American ICEOMatic, Japanese Qi Xing Ice Maker and Japanese eissmann Ice Maker are the mainstream ice makers in the world, accounting for the vast majority of the world. Ferguson is famous for inventing the world's first ice tube machine (granular). Wanliduo's ice maker specializing in making ice cubes occupies a large share in countries with developed fast food, such as the United States, while Scots are absolutely dominant in Europe. ICEOMATIC is very popular in the Middle East, the United States and many Asian countries, but its position in Japan is unshakable, which is related to the estimation of Japanese national complex! Scots are a kingdom that specializes in making all kinds of ice. She provides more than 200 models of ice machines, including ICE series, AC series, MC series, MV series, AF series, MF series, BF series, TDE series, CME series and MAR series. The daily ice production is from 10 kg to 10000 kg. The shapes of ice cubes are round, square, semi-square, irregular, scaly, massive and snowflake. Widely used in hotels, restaurants, fast food restaurants, karaoke bars, cafes, supermarkets, fisheries, food processing, medical care, families and other consumer places.
Advantages of air-cooled condenser:
Water resources are not needed, and the operation cost is low.
Easy to install and use, no need for other supporting equipment, just turn on the power supply and it can be put into operation.
Do not pollute the environment.
Suitable for areas with severe water shortage or scarce water supply.
Disadvantages of air-cooled condenser:
The cost is high.
The higher the condensation temperature, the lower the operating efficiency of the refrigeration unit.
Not suitable for areas with dirty air and dusty climate.
The cooling performance of water-cooled condenser is determined by the ambient wet bulb temperature. The higher the ambient wet bulb temperature, the higher the condensation temperature. Generally, water-cooled condenser is used, and the condensation temperature is about 5 ~ 7℃ higher than the ambient wet bulb temperature.
The condensation temperature limit of general refrigeration system;
Not higher than 55℃ and not lower than 20℃. In general, it is not recommended to use water-cooled condenser in areas where the ambient wet bulb temperature exceeds 42℃. Therefore, whether water-cooled condenser can be selected depends on the ambient wet bulb temperature.
Usually, when designing water-cooled ice makers, customers must be required to provide the highest ambient wet bulb temperature throughout the year. At the same time, when the ambient temperature exceeds 50℃, the water-cooled condenser cannot be used, and the cooling tower is easily damaged by high temperature. The cooling tower must be protected by shading.
★ Working principle of water-cooled condenser
High temperature and high pressure refrigerant gas enters the shell side of the condenser from the air inlet above the condenser. The cooling water is pumped out from the water storage tank of the cooling tower by the cooling water pump, enters the tube side of the condenser through the water inlet below the right side of the condenser, exchanges heat with the refrigerant outside the copper tube of the condenser, rises in temperature, comes out from the water outlet above the right side of the condenser, passes through the water outlet pipe, enters the water inlet of the cooling tower, is evenly sprayed on the filler through the water outlet of the water spray pipe, and is sucked by the fan to exchange heat with the water in the filler, so that the water temperature is lowered.
The refrigerant gas with high temperature and high pressure exchanges heat with the cooling water flowing in the tube side in the shell side of the condenser, and the temperature is reduced and condensed into liquid. The heat removal of refrigeration unit firstly exchanges heat with water (condensation heat exchange), and then water exchanges heat with air (cooling tower heat exchange).
Advantages of water-cooled condenser:
The condensation temperature of refrigeration unit is low, which improves the refrigeration efficiency.
The initial investment cost is lower than that of air cooling and evaporative cooling.
Good refrigeration effect, suitable for medium and large refrigeration systems.
Disadvantages of water-cooled condenser: it consumes water resources and sprays water, which has a certain impact on the surrounding environment; Need to install waterway system and water supply system.
Evaporative condenser: evaporative condenser, referred to as evaporative cooling.
The cooling performance of evaporative cooling condenser depends on the ambient wet bulb temperature. The higher the ambient wet bulb temperature, the higher the condensation temperature. Generally, water-cooled condenser is used, and the condensation temperature is about 5 ~ 7℃ higher than the ambient wet bulb temperature.
The condensation temperature limit of general refrigeration system;
Not higher than 55℃ and not lower than 20℃. In general, it is not recommended to use water-cooled condenser in areas where the ambient wet bulb temperature exceeds 42℃. Therefore, whether water-cooled condenser can be selected depends on the ambient wet bulb temperature. Usually, when designing water-cooled ice makers, customers must be required to provide the highest ambient wet bulb temperature throughout the year.
Evaporator of ice planer
Composition of Ferguson evaporator in Germany:
The evaporator of the FOCUSUN ice maker in Germany is driven by a reducer, which is composed of an ice skate, a sprinkling tray, a main shaft and a water receiving tray, and slowly rotates counterclockwise. Water enters the water distribution tray from the water inlet of the evaporator of the ice maker and is evenly sprinkled on the freezing surface through the water spray pipe to form a water film; The water film exchanges heat with the refrigerant in the refrigerant channel, and the temperature drops rapidly, forming a thin layer of ice on the frozen surface. Under the extrusion of the ice skates, it is broken into ice cubes and falls into the freezer from the ice chute. Part of the unfrozen water flows back from the water inlet to the cold water tank through the water receiving tray and is recycled by the cold water circulating pump.