Vapour Absorption System
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The document summarizes vapor absorption refrigeration systems, which use heat rather than mechanical work to power the refrigeration cycle. It describes the basic components and process, including how ammonia vapor is absorbed by water in the absorber, generated by heat in the generator, condensed in the condenser, and evaporated in the evaporator to absorb heat. It also discusses advantages over vapor compression systems, such as having no moving parts besides the pump and being able to operate using only thermal energy.
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The document discusses the history and principles of vapor absorption refrigeration systems. Some key points:
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Paper URL: https://www.ijtsrd.com/engineering/mechanical-engineering/23318/generation-of-air-conditioning-by-using-exhaust-gases-and-cooling-water-of-an-automobile-engine/dr-m-sampath-kumar
fdocuments.in_134167289-solar-refrigeration-ppt.ppt
The document discusses solar refrigeration, specifically describing solid absorption refrigeration cycles that can be powered by solar energy. It explains that solid absorption uses calcium chloride and ammonia, with no moving parts, making it well-suited for automatic solar operation. The cycle achieves evaporation temperatures required for refrigeration without sensitivity to high condensing temperatures. Applications include freezing ice blocks or an ice bank tank for preserving agricultural produce, meat, and fish.
Seminar
Vapour absorption refrigeration systems use a heat source to provide cooling instead of mechanical work. They operate similarly to vapor compression systems by using a refrigerant that condenses and evaporates between two pressure levels, but the refrigerant is absorbed into an absorbent liquid instead of being compressed by a pump. Common working fluid pairs include ammonia-water and lithium bromide-water. Absorption systems have advantages over compression systems like lower maintenance needs and ability to operate in remote locations using a heat source instead of electricity. The Electrolux refrigerator is a common domestic absorption system that uses ammonia, hydrogen, and water as working fluids to provide cooling through natural circulation without any moving parts besides a small heat source.
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Vapour Absorption System
- 1. Vapor Absorption Refrigeration System Submitted To : Sir. Rizwan Minhas Presented By : Muhammad Zeeshan Ali Saad Naseer Awan Zaid Amjad Muhammad Kashif Latif Naeem Akhter
- 2. It is a heat operated system. It is quite similar to Vapor Compression systems. Condensation and evaporation takes place at two different pressure levels to achieve refrigeration. The main motive is to raise the temperature of the refrigerant from evaporator pressure to condenser pressure. Introduction
- 3. Simple Vapor Absorption System Ammonia vapour from evaporator is absorbed by water in absorber. Condensation heat released is absorbed by cooling water. After being pumped to generator, heat is supplied which gives ammonia vapour. Weak sol. sent back to absorber. High pressure vapour is condensed to high pressure liquid ammonia in condenser. Liquid ammonia is throttled by expansion valve, and then it evaporates absorbing heat from evaporator.
- 4. Practical Vapour Absorption System Water vapours if reach condenser may block the expansion valve. Therefore, analyser-rectifier is used practically. Analyser : Strong solution flows down the trays. Due to high saturation temperature water condenses down and 𝑵𝑯 𝟑 vapours escape through. Rectifier : A water cooled heat exchanger which further condenses water vapour. (If any left) Heat Exchanger : Used to cool weak solution from generator. It also heats the strong solution coming from pump, thereby reducing heat to be supplied at generator, increasing economy.
- 5. Advantages of absorption system over compression system No moving part except pump-motor, which is comparatively smaller than compressor system. Quiet in operation, low maintenance cost. Can work only with thermal energy as an input. Can be built for huge working capacities.
- 7. Electrolux Refrigeration system This type of refrigerator is also called three fluid absorption system The three fluids used are ammonia, water and hydrogen. The ammonia act as the refrigerant. The hydrogen being the lightest gas is used to increase the rate of evaporation of the liquid ammonia passing through the evaporator. Water acts as the solvent.
- 8. Coefficient Of Absorption System
- 9. Environmental Effects of Refrigerants Ozone layer Depletion. Global warming.
- 10. THANK YOU!