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Technical Seminar Presentation-2013
Presented By: Abhinav Anand 1001297081
Hybrid Solar Desiccant Cooling System
ByABHINAV ANAND Regd. No: MECH 1001297081
Under the guidance of Asst Prof. Dharmanand
Barik
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Technical Seminar Presentation-2013
Presented By: Abhinav Anand 1001297081
Contents Introduction Solar Desiccant Evaporative Cooling System Solar thermal tile system NovelAire desiccant evaporative cooling systems Hybrid Solar Desiccant Evaporative Cooling System Advantages Application Conclusion References
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Technical Seminar Presentation-2013
Presented By: Abhinav Anand 1001297081
Introduction
Using excess summer heat from solar collectors to drive desiccant cooling systems .
.This technology is use to improves system efficiency.
These technologies convert primary energy into heating or cooling with COP’s between 2 and 5.
Here three technologies include solar thermal heating, evaporative cooling, and desiccant drying.
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Technical Seminar Presentation-2013
Presented By: Abhinav Anand 1001297081
Desiccant A desiccant material naturally attracts moisture from gases and liquid. The material
becomes as moisture by collecting the moisture on the surface.
solid desiccant include silica gel, activated alumina, lithium chlorate salt and molecular sieves.
Liquid desiccant include lithium chlorate, lithium bromide, calcium chloride and triethylene glycol solution.
the desiccant can be regenerated by the thermal energy.
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Technical Seminar Presentation-2013
Presented By: Abhinav Anand 1001297081
Solar desiccant evaporative cooling system
With the solar, desiccant and evaporative cooling industries each targeting there has been little joint development.
Solar thermal work is concentrated on flat plate water heating systems, which are generally not cost effective for space heating applications.
It can provide a significant portion of the space heating, hot water heating and space cooling needs of residential and commercial consumers.
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Technical Seminar Presentation-2013
Presented By: Abhinav Anand 1001297081
Solar thermal tile system
The solar thermal tile system is a mid temperature air heating collector.
It is design such way that The collector was at a slope of 20 degrees from the horizontal, an angle that would roughly equal a roof pitch of 4 in 12. The sun was at an angle of 37 degrees below perpendicular to the collector.
This system support desiccant regeneration with the large quantities of excess summer heat. Because the system is an air heating system, it is well suited for direct delivery of solar heated air for desiccant regeneration
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Technical Seminar Presentation-2013
Presented By: Abhinav Anand 1001297081
Fig. : Solar thermal tile system
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Technical Seminar Presentation-2013
Presented By: Abhinav Anand 1001297081
American solar roofing system
Side view, solar thermal tile system
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Technical Seminar Presentation-2013
Presented By: Abhinav Anand 1001297081
NovelAire Desiccant Evaporative Cooling System
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Technical Seminar Presentation-2013
Presented By: Abhinav Anand 1001297081
The cycle uses excess air passing through the desiccant wheel to create excess dry air.
After leaving the desiccant wheel (B), the hot dry air is cooled by heat exchanger (c).
The warm dry air is then split into two air streams.
The first stream (C-CX-CY) supports an indirect evaporative cooling of the second stream (C-C’).
This cools the second stream without adding any humidity at state point C’.
The final direct evaporative cooling stage from point C’ to D can adjust the temperature and humidity to any point on the line CD.
The regeneration side of the NovelAire cycle begins by recovering heat via the exhaust side of the heat exchange.
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Technical Seminar Presentation-2013
Presented By: Abhinav Anand 1001297081
Desiccant psychometrics
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Technical Seminar Presentation-2013
Presented By: Abhinav Anand 1001297081
Here the Psychometric Representation Of cycle along line A,B,C & 2 wheel limit
line.
The regeneration cycle is shown along E, G, I and J.
2 wheel limit line” in Figure represents the temperature and humidity possible by evaporative cooling.
The line C’ D represents one such cooler drier condition.
E is original state point.
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Technical Seminar Presentation-2013
Presented By: Abhinav Anand 1001297081
Hybrid Desiccant Evaporative Cooling System
This system includes following system
1) A solar thermal tile system.
2) A NovelAire desiccant evaporative cooling systems.
3) One additional evaporative cooling system between state points E and F,
4) A hot water heating system using the waste heat from the desiccant
regeneration at state point J.
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Technical Seminar Presentation-2013
Presented By: Abhinav Anand 1001297081
Integrated SOLAR-DES-EVAP cycle
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Technical Seminar Presentation-2013
Presented By: Abhinav Anand 1001297081
In hybrid desiccant does not use recovered heat from the heat exchanger for desiccant regeneration.
Instead of this tile roof is used as the primary heating source for desiccant regeneration.
Supplemental gas heat is used to desiccant regeneration during cloudy days.
The hot water heating systems uses waste heat from the desiccant regeneration to heat water via an air-to-water heat exchanger.
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Technical Seminar Presentation-2013
Presented By: Abhinav Anand 1001297081
Integrated SOLAR-DES-EVAP psychometrics The increased cooling for the heat exchanger by the building air can be seen from
the change in state point temperature from E to F.
The first stage cooling of the heat exchanger from A to L can also
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Technical Seminar Presentation-2013
Presented By: Abhinav Anand 1001297081
Advantage
Direct indirect and evaporative cooling system is less expensive than vapour compression system.
It decreases the electrical demand.
Hybrid system can provide year round comfort.
removes moisture from the air without the use of ozone-depleting compounds.
reduce initial capital investment.
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Technical Seminar Presentation-2013
Presented By: Abhinav Anand 1001297081
Integrated cycle energy cost saving
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Technical Seminar Presentation-2013
Presented By: Abhinav Anand 1001297081
Application
DEFENCE
SUGAR
COATING
PACKING
POWERPLANT
TABLETTING
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Technical Seminar Presentation-2013
Presented By: Abhinav Anand 1001297081
Conclusion
The hybrid cycle can use less energy than a normal vapour compression unit. Considering a case of high effectiveness hybrid cycle meeting the high sensible load.
The average energy saving in the summer and winter conditions are considered is 24%.
The saving in resource energy are at least equal to and typically higher than this (27% and40% respectively)
saving is depending on the size of the solar energy system associated with the hybrid cycle.
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Technical Seminar Presentation-2013
Presented By: Abhinav Anand 1001297081
References
www.americansolar.com
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Technical Seminar Presentation-2013
Presented By: Abhinav Anand 1001297081
THANK YOU
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Technical Seminar Presentation-2013
Presented By: Abhinav Anand 1001297081
ANY QUERIES ?
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