Vapour Absorption Cycle Questions

In summary, the conversation was about researching vapour absorption cycle machines, specifically water ammonia refrigerators. The questions asked were about the role of water in the absorption process, the state of ammonia in the solution, and the release of heat during absorption. The provided link offers a detailed description of absorption refrigerators.
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Brett0
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Questions on absorption coolers
Hi all,

I'm doing some research on vapour absorption cycle machines, mainly water ammonia refrigerators.
I've got a few questions.

1. What is the role of the water absorber? ie why do we need the water?
2. In the absorber we have a water ammonia solution. Is the ammonia a gas in the solution (like C02 in coca cola) or liquid, like mixing bourbon and coke (bad example I know)
3. There is always a mention of heat being released in absorption. Is that because the ammonia is becoming a liquid in the water-ammonia solution? is the absorption process condenses the hot gaseous ammonia?

Any help would be fantastic
 
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FAQ: Vapour Absorption Cycle Questions

What is a vapour absorption cycle?

A vapour absorption cycle is a type of refrigeration cycle that uses a liquid refrigerant and a sorbent to produce cooling. It works by absorbing heat from a low-temperature source and releasing it to a higher-temperature sink, using a chemical reaction to drive the process.

How does a vapour absorption cycle work?

In a vapour absorption cycle, a refrigerant (usually ammonia) is absorbed by a sorbent (such as water) in a low-pressure generator. The resulting solution is then pumped to a high-pressure condenser, where the refrigerant is released and condensed into a liquid. The liquid refrigerant then passes through an expansion valve, where it evaporates and absorbs heat from the surrounding environment. The vapour is then returned to the generator to continue the cycle.

What are the advantages of a vapour absorption cycle?

One of the main advantages of a vapour absorption cycle is that it can use waste heat or low-grade energy sources, such as solar or geothermal energy, to drive the process. It also does not require any moving parts, making it more reliable and easier to maintain than other refrigeration systems.

What are the applications of a vapour absorption cycle?

Vapour absorption cycles are commonly used in refrigeration and air conditioning systems, as well as in industrial processes that require cooling, such as food processing and chemical production. They are also used in power plants to increase efficiency by using waste heat to drive the cycle.

What are the limitations of a vapour absorption cycle?

One limitation of a vapour absorption cycle is that it is less efficient than vapour compression cycles, which use mechanical energy to drive the process. It also requires larger equipment and a more complex design, making it more expensive to install. Additionally, the choice of refrigerant and sorbent can have a significant impact on the performance and environmental impact of the cycle.

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