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An absorption cycle can be viewed as a mechanical vapor-compression cycle, with the compressor replaced by a generator, absorber and liquid pump. The absorption cycle enjoys the benefits of requiring a fraction of the electrical input, plus uses the natural substances ammonia and water, instead of ozone depleting halocarbons. The absorption cycle enjoyed widespread use from the 1920âs as gas powered refrigerators/ice-makers.

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Turbine inlet cooling is a very efficient use of absorption cooling, boosting turbine efficiency by up to 15%. Many other applications exist in industry, where waste heat is available and cooling is required. Advanced cycles can also produce electrical or shaft power by producing steam or high pressure vapor to power a turbine/generator pair.

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The basic operation of an ammonia-water absorption cycle is as follows. Heat is applied to the generator, which contains a solution of ammonia water, rich in ammonia. The heat causes high pressure ammonia vapor to desorb the solution.

Â An absorption cycle can use a variety of working pairs. The working pair is made up of a refrigerant, typically ammonia or water; and a solution which absorbs the refrigerant. Other working pairs include lithium-bromide-water; TriDroxide-water; and Alkitrate-water. Tridroxide and Alkitrate are Energy Concepts patented working pairs with specialty applications in industry.

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Absorption cycles can operate at high efficiency by utilizing advanced cycles, using generator-absorber heat exchange, multiple pressures, and multiple effects. These cycles use extensive internal heat recovery to require less prime fuel input to produce the same thermal output. High efficiency operation, plus benefits of environmentally friendly refrigerants, clean-burning fuels, and few moving parts requiring maintenance make absorption a very good choice for consumers.Â

The key to the cost reduction is the innovative spectrometer design. This approach takes light on a circular path – rather than the conventional combination of lenses, mirrors and precision diffractive optics. The overall result is a product which reduces the typical weight of a clinical OCT system from 50-70 pounds down to just 4 pounds, while cutting the cost from at least $60,000 to less than $14,000.

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Optical Coherence Tomography is the light-equivalent to SONAR, sending signals to, then reflecting off of surfaces in order to measure depths of individual layers. Those collective signal measurements form an image of the retinal layers, where eye diseases quietly lurk, and can be accurately detected. Although OCT has been available for over 25 years, it remains an expensive technology to manufacture and operate. The use of high-quality optics, precision components and complex software have put this technology out of reach for most healthcare providers worldwide.

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Absorption cycles can produce a variety of thermal outputs. In common commercial use today are gas-fired absorption chillers, which produce chilled water for space cooling applications. The absorption cycle can produce low temperature cooling for ice production or cold storage.

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Lumedica Vision was founded by an experienced team of engineers including Chief Scientist Dr. Adam Wax from the Pratt School of Engineering. Dr. Wax’s team has developed a new low-cost optical coherence tomography (OCT) scanner that could dramatically extend the impact of the imaging technology for eye health by making eye imaging more affordable, accessible and easier to use. Affordable access would enable more health care providers to conduct OCT imaging, giving patients greater, earlier access to the one test that can save their vision and improve their quality of life.

Heat can either be from combustion of a fuel such as clean-burning natural gas, or waste heat from engine exhaust, other industrial processes, solar heat, or any other heat source. The high pressure ammonia vapor flows to a condenser, typically cooled by outdoor air. The ammonia vapor condenses into a high pressure liquid, releasing heat which can be used for product heat, such as space heating.

The high pressure ammonia liquid goes through a restriction, to the low pressure side of the cycle. This liquid, at low pressures, boils or evaporates in the evaporator. This provides the cooling or refrigeration product. The low pressure vapor flows to the absorber, which contains a water-rich solution obtained from the generator.

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“Our goal is to make OCT drastically less expensive, so more clinics can afford the devices, especially in global health settings,” said Wax

This solution absorbs the ammonia while releasing the heat of absorption. This heat can be used as product heat, or for internal heat recovery in other parts of the cycle, thus unloading the burner and increasing cycle efficiency. The solution in the absorber, now once again rich in ammonia, is pumped to the generator, where it is ready to repeat the cycle.Â

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The Absorption Cycle was invented in 1846 by Ferdinand CarrÃ© for the purpose of producing ice with heat input. It is based on the principle that absorbing ammonia in water causes the vapor pressure to decrease. Absorption cycles produce cooling and/or heating with thermal input and minimal electric input, by using heat and mass exchangers, pumps and valves.

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