Hybrid solar desiccant cooling system

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

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

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.

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.

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.

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

Fig. : Solar thermal tile system

American solar roofing system

Side view, solar thermal tile system

NovelAire Desiccant Evaporative Cooling System

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.

Desiccant psychometrics

Here the Psychometric Representation Of cycle along line A,B,C & 2 wheel limit

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.

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.

Integrated SOLAR-DES-EVAP cycle

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.

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

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.

Integrated cycle energy cost saving

Application

DEFENCE

COATING

PACKING

POWERPLANT

TABLETTING

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.

References

www.americansolar.com

THANK YOU

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Hybrid solar desiccant cooling system

Technology

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