Ice maker

This article is about ice making machines. For ice maintenance in the sport of curling, see Curling.

An ice maker, ice generator, or ice machine may refer to either a consumer device for making ice, found inside a home freezer; a stand-alone appliance for making ice, or an industrial machine for making ice on a large scale. The term "ice machine" usually refers to the stand-alone appliance.

The ice generator is the part of the ice machine that actually produces the ice. This would include the evaporator and any associated drives/controls/subframe that are directly involved with making and ejecting the ice into storage. When most people refer to an ice generator, they mean this ice making subsystem alone, minus refrigeration.

An ice machine, however, particularly if described as 'packaged' would typically be a complete machine including refrigeration and controls, requiring only connection to utilities.

The term ice maker is more ambiguous, with some manufacturers describing their packaged ice machine as an ice maker, while others describe their generators in this way.

History

In 1748, The first known artificial refrigeration was demonstrated by William Cullen at the University of Glasgow。[1]

In 1844, an American physician, John Gorrie, built a refrigerator based on Oliver Evans' design to make ice to cool the air for his yellow fever patients, so can probably be said to be the father of the ice generator.

In 1851, John Gorrie was awarded US Patent 8080 for an ice machine.

In 1853, Alexander Twining was awarded US Patent 10221 for an ice maker. In 1855, James Harrison received a similar patent for an ice maker in Australia.

In 1867, Andrew Muhl built an ice-making machine in San Antonio, Texas, to help service the expanding beef industry before moving it to Waco in 1871.[2] In 1873, the patent for this machine was contracted by the Columbus Iron Works,[3] which produced the world's first commercial ice-makers. William Riley Brown served as its president and George Jasper Golden served as its superintendent. In 1902, the Teague family of Montgomery purchased control of the firm. Their last advertisement in Ice and Refrigeration appeared in March 1904.[4] In 1925, controlling interest in the Columbus Iron Works passed from the Teague family to W.C. Bradely of W.C. Bradley, Co.[5]

Principle of ice making

All refrigeration equipments are made of four key components; the evaporator, the condenser, the compressor and the throttle valve. Ice machines all work the same way. The function of compressor is to compress low pressure refrigerant vapor to high pressure vapor, and deliver it to the condenser. Here, the high pressure vapor is condensed into high pressure liquid, and drained out through the throttle valve to become low pressure liquid. At this point, the liquid is conducted to the evaporator where heat exchanging occurs, and ice is created. This is one complete refrigeration cycle.

Consumer ice makers

Freezer ice makers

Automatic ice makers for the home were first offered by the Servel company around 1953.[6][7] They are usually found inside the freezer compartment of a refrigerator. They produce crescent-shaped ice cubes from a metal mold. An electromechanical or electronic timer first opens a solenoid valve for a few seconds, allowing the mold to fill with water from the domestic cold water supply. The timer then closes the valve and lets the ice freeze for about 30 minutes. Then, the timer turns on a low-power electric heating element inside the mold for several seconds, to melt the ice cubes slightly so they will not stick to the mold. Finally, the timer runs a rotating arm that scoops the ice cubes out of the mold and into a bin, and the cycle repeats. If the bin fills with ice, the ice pushes up a wire arm, which shuts off the ice maker until the ice level in the bin goes down again. The user can also lift up the wire arm at any time to stop the production of ice.

Early ice makers dropped the ice into a bin in the freezer compartment; the user had to open the freezer door to obtain ice. In 1965, Frigidaire introduced ice makers that dispensed from the front of the freezer door.[8] In these models, pressing a glass against a cradle on the outside of the door runs a motor, which turns an auger in the bin and delivers ice cubes to the glass. Most dispensers can optionally route the ice through a crushing mechanism to deliver crushed ice. Some dispensers can also dispense chilled water.

Portable ice makers

Portable ice makers are units that can fit on a countertop. They are the fastest and smallest ice makers on the market. The ice produced by a portable ice maker is bullet shaped and has a cloudy, opaque appearance. The first batch of ice can be made within 10 minutes of turning the appliance on and adding water. The water is pumped into a small tub with metal pegs immersed in the water. The pegs have a heating and cooling system inside that freeze the water around them and then heat up so the ice slips off the peg and into the storage bin. Portable ice makers will not keep the ice from melting, but the appliance will recycle the water to make more ice.

Built-in/freestanding ice makers

Built-in ice makers are engineered to fit under a kitchen or bar counter, but they can be used as freestanding units. They produce crescent-shaped ice like the ice from a freezer ice maker. The ice is cloudy and opaque instead of clear, because the water is frozen faster than in clear cube ice makers. In the process, tiny air bubbles get trapped, causing the cloudy appearance of the ice.

Industrial ice makers

Commercial ice cube makers improve the quality of ice by using moving water. The water is run down a surface that is constantly at 0 degrees C (32F) because only water without impurities will freeze at this temperature on a surface. Water with impurities requires lower temperatures to freeze and will continue to wash down the surface and through the drain of a commercial ice maker. Air and undissolved solids will be washed away to such an extent that in horizontal evaporator machines the water has 98% of the solids removed resulting in very hard virtually pure, clear ice. In vertical evaporators the ice is softer, more so if there are actual individual cube cells. Commercial ice machines can make different sizes of ice like flakers, crushed, cube, octagon, and tube.

When the sheet of ice on the cold surface reaches the desired thickness, the sheet is slid down onto a grid of wires, where the sheet's weight causes it to be cut into the desired shapes, after which it falls into a storage bin.

Flake ice machine

Flake ice is made of the mixture of brine and water (max 500g salt per ton of water), in some cases can be directly made from brine water. Thickness between 1mm-15mm, irregular shape with diameters from 12mm to 45mm.

The evaporator of the flake ice machine is a vertical placed drum shape stainless steel container, equipped with the rotating blade which spins and scratches the ice of the inner wall of evaporative. When operating, the principle shaft and blade spins anti-clock wisely pushed by the reducer. Water is sprayed down from the sprinkler; ice is formed from the water brain on the inner wall.

Applications

Sea water flake ice machine can make ice directly from the sea water. This ice can be used in fast cooling of fish and other sea products. The fishing industry is the largest user of flake ice machines. Flake ice can lower the temperature of cleaning water and sea products, therefore it resists the growth of bacteria and keeps the sea food fresh.

For similar reasons it is also applied in vegetable, fruit and meat storing and transporting.

In baking, during the mixing of flour and milk, flake ice can be added to prevent the flour from self raising.

In most cases of biosynthesis and chemosynthesis, flake ice is used to control the reaction rate and maintain the liveness. Flake ice is sanitary, clean with rapid temperature reduction effect.

Flake ice is used as the direct source of water in concrete cooling process, more than 80% in weight. Concrete will not crack if has been mixed and poured in constant and low temperature.

Cube ice maker

Cube ice machines are classified as small ice machines, in contrast to [tube ice machines, flake ice machines, or other ice machines. Common capacities range from 30 kg (65 lb) to 1755 kg (3900 lb). Since the emergence of cube ice machines in 1970s, they have evolved into a diverse family of ice machines.

Cube ice machines are commonly seen as vertical modular devices. The upper part is an evaporator, and the lower part is an ice bin. The refrigerant circulates inside pipes of sale-contained evaporator, where it conducts the heat exchange with water, and freezes the water into ice cubes. When the water is thoroughly frozen into ice, it is automatically released, and falls into the ice bin.

The ice bin can also be equipped with compressors. Generally cube ice machines with over 320 kilograms (710 lb) capacities have built-in compressors in the ice bin for storage prior to sales, for use when demands are large.

Cube ice is created in a cubic shape, with each edge usually between 15mm and 35mm. The surface area of every ton of cube ice is approximately 1,383 square metres (14,890 sq ft).

Compressor

Most compressors are either positive displacement compressors or radial compressors. Positive displacement compressors are currently the most efficient type of compressor, and have the largest refrigerating effect per single unit (400RT-2500RT)[further explanation needed]. They have a large range of possible power supplies, and can be 380V, 1000V, or even higher. The principle behind positive displacement compressors utilizes a turbine to compress refrigerant into high pressure vapor. Positive displacement compressors are of four main types: screw compressor, rolling piston compressor, reciprocating compressor, or rotary compressor.

Screw compressors can yield the largest refrigerating effect among positive displacement compressors, with their refrigerating capacity normally ranging from 50RT to 400RT[further explanation needed]. Screw compressors also can be divided to single screw type and dual screw type. Dual screw type is more often seen in use because they are very efficient.

Rolling piston compressors and reciprocating compressors have similar refrigerating effects, and maximum refrigerating effect can reach 600Kw.[further explanation needed]

Reciprocating compressors are the most common type of compressor because the technology is mature and reliable. Their refrigerating effect ranges from 2.2 kW to 200 kW.[further explanation needed] They compress gas by utilizing a piston pushed by a crank shaft.

Rotary compressors, mainly used in air conditioning equipment, have a very low refrigerating effect, normally not exceeding 5 kW. They work by compressing gas using a piston pushed by a rotor, which spins in an isolated compartment.

Condenser

All condensers can be classified as one of three types: air cooling, water cooling, or evaporative cooling.

  • An air cooling condenser uses air as the heat conducting media by blowing air through the surface of condensers, which carries heat away from the high pressure, high temperature refrigerant vapor.
  • A water cooling condenser uses water as the heat conducting media to cooling refrigerant vapor to liquid.
  • An evaporative condenser cools the refrigerant vapor by using heat exchange between the evaporator pipes and the evaporated water which is sprayed on the surface of the pipes. This type of condenser is capable of working in warm environments, they are also very efficient and reliable.

Tube ice generator

The tube ice generator in which the water is frozen in tubes extended vertically within a surrounding casing defining a freezing chamber spaced above the bottom of which is a distributor plate having apertures surrounding the tubes and defining the separate chamber into a warm gas is passed to heat the tubes to cause the ice rods to slide therefrom.[9]

Applications

Tube ice can be used in the cooling process, such as temperature controlling, fish fresh freezing, beverage bottle freezing, etc. It can be consumed alone and with food or beverages.

See also

References

External links

  • How to Buy an Energy-Efficient Commercial Ice Machine. Federal Energy Management Program. Accessed April 2, 2009.
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  • Where to Buy an Energy-Efficient Commercial Ice Machine
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