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omayma



Number of posts : 255
Registration date : 2007-07-04

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PostSubject: Green House Effect   Green House Effect Icon_minitimeThu Jul 05, 2007 9:54 pm

write whatever u find out about Green House Effect idea..!
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Alaa Kattan



Number of posts : 210
Registration date : 2007-07-04

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PostSubject: Re: Green House Effect   Green House Effect Icon_minitimeFri Jul 06, 2007 1:21 am

Quote :
إن تكنولوجيا التبريد الشمسي الآن تعتبر من أهم
تطبيقات الطاقة الشمسية، خاصة أنها طاقة نظيفة ومتجددة لا تحتاج لتقنية
عالية للحصول عليها وتخزينها، فضلاً عن أنها غالبًا ما تستخدم فيها مواد
صديقة للبيئة، وهو ما يعطي لها أهمية، خاصة مع انتشار التلوث، وتعرض مواد
الطاقة التقليدية كالمحروقات للنضوب، وارتفاع تكاليف استخراجها.

Quote :
وتستخدم الطاقة الحرارية للشمس كمصدر للطاقة في هذا النوع من الثلاجات بواسطة طريقتين:

الطريقة الأولى يتم فيها
تجميع أشعة الشمس بواسطة مركزات شمسية تتكون من عدسات مجمعة للأشعة (عدسات
لامة)؛ لتسخين بعض الزيوت والسوائل التي تتميز بقدرتها على تحمل درجات
الحرارة ما بين 100 و130 درجة مئوية، وتخزينها في خزانات حرارية تحفظها
ساخنة؛ لاستخدامها على مدار اليوم في تسخين المولد الكهروحراري الذي
يستخدم في توليد التيار الكهربي المستمر اللازم لتشغيل وحدة التبريد

Quote :

أما الطريقة الثانية فيتم الاستعاضة فيها عن
المحول الكهروحراري بالخلايا الشمسية الكهروفولتية، ويتم تصنيعها من
السليكون؛ حيث تؤدي الطاقة الضوئية للشمس الساقطة عليها إلى استثارة
الفوتونات الضوئية الموجودة بتلك الخلايا؛ لينتج عنها طاقة حرارية، وهو ما
يؤدي لترك الإلكترونات الساخنة لمواقعها إلى مواضع أقل حرارة، وتحرك
الإلكترونات الباردة في الاتجاه المعاكس، وهو ما ينتج عنه قوة دافعة
كهربية تستخدم في توليد التيار الكهربي المستمر اللازم لتشغيل الثلاج

التفاصيل في اللينك ده

http://www.islamonline.net/servlet/Satellite?c=ArticleA_C&cid=1178193365872&pagename=Zone-Arabic-HealthScience%2FHSALayout

الموضوع ده لو استثمرنا جانب توليد الحرارة منه هيكون مفيد و انا بحاول اخد التمهيد منه ل

green house effect
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Alaa Kattan



Number of posts : 210
Registration date : 2007-07-04

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PostSubject: Re: Green House Effect   Green House Effect Icon_minitimeFri Jul 06, 2007 1:43 am

SOLAR GREENHOUSE


Green House Effect SolgrenA
solar greenhouse is specially designed for heat gain. The glazing is
perpendicular to the angle of a winter sun. The upside-down funnel shape of the
greenhouse concentrates hot air near the top flap. On a 20 F., windy,
January day in Plattsburgh NY I measured temperatures in excess of 160 degrees
F. at the solar greenhouse apex. Hot air is lighter than cold air so it naturally
rises and pushes the top flap open. The cold air return flap is pushed open in a
like manner. This allows cold air from the living space to be returned into the
solar greenhouse for heating.

At night the solar greenhouse cools down so that cold greenhouse air attempts to
enter the house through the bottom flaps. This reverse circulation is prevented
by the simple plastic one way flaps.






The solar greenhouse is a good example of a passive
application of the greenhouse effect.

Active solar energy systems also make use of the
greenhouse effect.

Another good application would be the flat plate collector.
Heat from the greenhouse effect is able to boil water inside a well constructed
solar collector. If you don't believe me try it. Just click on the banner and
learn how to build your very own solar hot water system.

http://www.jc-solarhomes.com/how_to.htm
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omayma



Number of posts : 255
Registration date : 2007-07-04

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PostSubject: Re: Green House Effect   Green House Effect Icon_minitimeFri Jul 06, 2007 1:04 pm

Q?

ya3ny dy tosta7'dam ma3 turbine walla 7anwaled biha a exactly?!!! Rolling Eyes
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omayma



Number of posts : 255
Registration date : 2007-07-04

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PostSubject: Re: Green House Effect   Green House Effect Icon_minitimeFri Jul 06, 2007 10:50 pm

turning heat into sound and then into electricity Rolling Eyes

http://www.sciencedaily.com/releases/2007/06/070603225026.htm
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Alaa Kattan



Number of posts : 210
Registration date : 2007-07-04

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PostSubject: Re: Green House Effect   Green House Effect Icon_minitimeSat Jul 07, 2007 1:41 am

ana 3ayz ala2y ay doctor bio-chemistry aw ay Doctor Gas ....

fadel ma3loma mesh 3aref agebha men el net

law 7ad ye3raf ye2olly darooooooory

---------------------------------

el link el a7`er beta3 el conversion men el heat le el sound we ba3den electricity fekra gamda geddan

bas lessa fy el researches le el asaf we el sponser Very Happy Very Happy

US Army

ana 7awelt ad7`ol site utah university we ab3at mail le el DR bas mesh la2y el contact

ha7awel fy amaken tanya isA
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omayma



Number of posts : 255
Registration date : 2007-07-04

Green House Effect Empty
PostSubject: Re: Green House Effect   Green House Effect Icon_minitimeSat Jul 07, 2007 1:58 am

mesh me3na biochemistry Rolling Eyes ,...heya 7aga related le eih ?!! Question
mafish dr's thermo aw ay 7aga tanya yenfa3o ,...asl 7angin biochemistry menen : Shocked
though,...momken 7ad yela2y...!!



asl el fekra lazem tetla3 ....!
bounce
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Alaa Kattan



Number of posts : 210
Registration date : 2007-07-04

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PostSubject: Re: Green House Effect   Green House Effect Icon_minitimeSat Jul 07, 2007 2:01 am

http://zebu.uoregon.edu/1998/es202/l13.html

------------------------------------------------

shakl el product elly mota7`ayyelo zay el dish keda

antenna we reciever

el antenna dy 3obara 3an 3adasa tegamma3 do2 el shams we momken yekon feha sensors to control el kemyya we el length beta3 el waves elly e7na 3ayzenha we el reciever dah feh el mixture beta3 el gases 3lshan yenzel 3aleh el do2 we yetem el fata3ol we tetla3 el 7arara we tetwazza3 3ala el sa7`anat masalan we el tadfe2a we momken el steam elly ye7arrak turbines we yegenerate el electricity

tab3an el 7agm we el emkanyyat 7asab talab el 3ameel

3lshan tadfe2at sha22a 3`er 2asr

we ela ganeb en el shams motawaffera dayman

dah el shakl el mabda2y


el moshkela delwa2ty ma3aya heyya emkaneyyet enny a3mel mixture el gases dah mota7a walla la2

we eh el ma2adeer Laughing

we el heat el natga kebera walla la2

asl el sara7a lamma el kon bel mesa7a dy kollaha yezeb .5 degree ma3na keda law a7`adna area as3`ar hayeddey heat a3la

wallah a3lam

Embarassed
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Alaa Kattan



Number of posts : 210
Registration date : 2007-07-04

Green House Effect Empty
PostSubject: Re: Green House Effect   Green House Effect Icon_minitimeSat Jul 07, 2007 2:11 am

kol ma adawwar fy mawdo3 el global warming dah wala2y el nas kollaha 3ayza tekaf7o we ana 3ayz asta3`ello a7es enny mareeeed Shocked geek

-------------------------------

ya gama3a tab elly ye3raf nemret Dr ehab morees ye2olha 3lshan akallemo le2enny mesh damen 2ala2y 3abdallah el sob7 we a7`od menno el nemra
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omayma



Number of posts : 255
Registration date : 2007-07-04

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PostSubject: Re: Green House Effect   Green House Effect Icon_minitimeSat Jul 07, 2007 2:52 am

ana akeed mesh ma3rafsh wasila lel etesal bih,...bas momken law ma3reftesh tewsal le 3abdalla,..shof ay 7ad mekanika,...aw es2al 3andohom fel forum beta3hom law beted7'ol henak ,...ana mesh 3arfah sara7a Rolling Eyes



3ala fekra wana we esra2 wa2feen nerkab la2enah tale3 men el koleya bas rakeb el 3arabeya meen kan 7aywa2afo ba2a Laughing ?
-----------------

as for el fekra ma da el lateral thinking Very Happy
mesh lazem nefdal ne7'bat fel 7eta we7na momken nelef 7awaliha Laughing

bas el moshkela el technical approach da elly beywa2afna shwya...!

bas 7'er ISA el fekra 7atetla3 scratch
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esraa



Number of posts : 2
Registration date : 2007-07-07

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PostSubject: Re: Green House Effect   Green House Effect Icon_minitimeSat Jul 07, 2007 10:47 am

i found this

w mesh 3arfa momkn yefedna b eh
Greenhouse Energy Conservation Checklist



Increasing energy costs make conservation and efficient use of facilities an important part of today’s greenhouse operation. New greenhouse designs, better glazing, improved heating and ventilating equipment and new management systems should be included when upgrading or adding on. With typical annual energy usage being 75% for heating, 15% for electricity and 10% for vehicles, efforts and resources should be put where the greatest savings can be realized.




Reduce Air Leaks

Keep doors closed - use door closer or springs.
Weatherstrip doors, vents and fan openings. For example, a 48” fan louver that fails to close properly leaving 1” gaps, allows 23,000 Btu/hr of heat to escape costing $0.35 if you are burning $1.50 fuel oil.
Lubricate louvers frequently so that they close tight. A partially open louver may allow several air changes per hour. Additional fuel is needed to heat this air. Shut off some fans during the winter and cover openings with insulation or plastic to reduce infiltration of air.
Repair broken glass or holes in the plastic covering.

Double Covering

Line sidewalls and endwalls of greenhouse inside with poly or bubble wrap to achieve the thermopane effect. Install double wall polycarbonate structured sheets to get insulation effect and reduce recovering labor.
Use poly with an infrared inhibitor on the inner layer for 15% savings. Payback is 2-3 months.
Add a single or double layer of plastic over older glasshouses to reduce infiltration and heat loss by 50%.

Energy Conserving Blanket

Install a thermal blanket for 20%-50% savings. Cost is $1.00 - $2.50/sq ft. Payback is 1-2 years. Tight closures should be maintained where curtains meet sidewalls, framing or gutters. Use a U-shaped trap to prevent heat from escaping overhead. Heat and water lines should be insulated or located below the blanket.



Foundation and Sidewall Insulation

Insulate the foundation - place 1-2” polyurethane or polystyrene board to 18” below ground to reduce heat loss. This can increase the soil temperature near the sidewall as much as 10 degrees during the winter.
Insulate the kneewall or sidewall to bench height. Use 1” to 2” of insulation board. Applying 2” of foam insulation to a 3’ high kneewall on a 28’ x 100’ greenhouse will save about 400 gallons of fuel oil/year.
Insulate behind sidewall heat pipes - Use aluminum faced building paper or insulation board behind to radiant heat back into the growing area. Leave air space next to wall to prevent frost damage to the wall.


Site Location

Locate new greenhouses in sheltered areas to reduce wind-induced heat loss, if this does not reduce light.
Install windbreaks on the north and northwest sides of the greenhouse. The windbreak can be a double row of conifer trees or plastic snow fence.


Space Utilization

Increase space utilization to 80% - 90% with peninsular or movable benches.
Install multi-level racks for crops that don’t require high light levels.
Grow a crop of hanging baskets on overhead rails or truss-mounted conveyor system.
A roll-out bench system can double growing space. Plants are moved outside during the day.

Efficient Heating System

Installation of floor or under-bench heat will allow air temperature to be set 5º - 10ºF lower.
Yearly maintenance - Check boiler, burner and backup systems to make sure they are operating at peak efficiency. Have furnaces cleaned and adjusted and an efficiency test run before heating season. A 2% increase in efficiency for a 30’ x 150’ greenhouse will save about 200 gallons of fuel oil.
Clean heating pipes and other radiation surfaces frequently.
Check accuracy of thermostats – correcting a reading that is 2ºF high will save $100-$200.
Install electronic thermostats or controllers with a 1° F accuracy. Potential yearly savings of 500 gallons of fuel oil in a 30’ x 100’ greenhouse when changing from a mechanical to electronic thermostat or controller.
Aspirate thermostats or sensors for more uniform temperature control. Differential between on and off can be reduced as much as 6ºF.
Install horizontal air flow (HAF) fans to get more uniform temperature in the growing area.
Insulate distribution pipes in areas where heat is not required.
Check and repair leaks in valves, steam traps and pipes.


Efficient Cooling System

Build new greenhouse with open-roof design to eliminate the need for fans.
Install roll-up or guillotine sides to reduce the need for fan ventilation.
Use shading to reduce the need for mechanical cooling.
Install evaporative cooling to get better temperature control during the summer.
Select fans that meet AMCA standards and have a Ventilation Efficiency Ratio greater than 15.Use the largest diameter fan with the smallest motor that meets ventilation requirements.
Keep doors closed when fans are operating.
Locate intake louvers to give uniform cooling.


Conserve Electricity

Have wiring system inspected for overloading, corroded parts and faulty insulation.
Replace 3 hp or larger motors with high efficiency ones to reduce electric consumption by 2-5%.
Check for proper belt tension and alignment.
Replace incandescent bulbs with low wattage fluorescent or HID bulbs. Save 2/3rds on electricity.
Install motion detectors to control security lights so they are not on all the time.


Trucks and Tractors

Regularly scheduled tune-ups can save 10% on fuel usage. Keep tires properly inflated.
Avoid lengthy idling. Idling can consume 15-20% of the fuel used.
Run equipment in the proper gear for the load.


Water Systems

Locate hot water tanks as close as possible to the largest and most frequent use. Insulate pipes.
Heat water to the lowest temperature needed, usually 120ºF is adequate.
Use pipe size large enough to supply necessary water at minimum friction loss.
Eliminate water leaks – A dripping faucet at 60 drops/min. will waste 113 gallons/month.


Management

Lower night temperature – Fuel consumption is reduced 3% for each 1ºF night temperature is lowered.
Delay starting the greenhouse by a week or more. Build a germination/growth chamber to start seedlings.
Keep growing areas full at all times.


Additional information can be found in Energy Conservation for Commercial Greenhouses – NRAES-3, 100 pages, $20.00 available from the Department of Natural Resources Mgt. & Engr., 1376 Storrs Rd., UConn, Storrs CT 06269-4087. Make check payable to UConn. Price includes postage and handling.





John W. Bartok, Jr.

Agricultural Engineer

Natural Resources Mgt. & Engr. Dept.

University of Connecticut, Storrs CT

May 2005


http://www.hort.uconn.edu/ipm/greenhs/bartok/htms/Greenhouse%20Energy%20Conservation%20Checklist.htm
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Alaa Kattan



Number of posts : 210
Registration date : 2007-07-04

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PostSubject: Re: Green House Effect   Green House Effect Icon_minitimeSat Jul 07, 2007 1:36 pm

ba3attelhom now e-mail as2alhom 3ala el fekra fy el no2at elly wa2fa oddamna we yaret yeroddo 2abl montasaf el lel el naharda ya raaaaaaab

ipm@uconn.edu


bas ana motafa2el i s A Cool
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Alaa Kattan



Number of posts : 210
Registration date : 2007-07-04

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PostSubject: Re: Green House Effect   Green House Effect Icon_minitimeSat Jul 07, 2007 4:40 pm

delwa2ty lamma etkallemt ma3a 3abdalla betarkez fy el kalam elly 2alo el DR ehab morees

el Dr akked 3ala en el heat el natga raheeba we kebera geddan we en risk beta3 el methane kan fy wogod el equipment gowa el beet nafso we d no2at a3taked ennaha mofeda 3ala asas en el heat el kebera dy e7na me7tagenha fe3lan we en wogod el gehaz fy el beet dy momken ne7ello law 7`allena el set mawgod 3ala sat7 el building aw 3ala el building men barra

we el Dr 2al en el mixture elly fy el gaw howa el wa7eed elly yenfa3 3lshan el tafa3ol yetem

ana law feh forsa le 7ad bokra el sob7 i s A momken aro7 el kollya as2alo 3an shakl mo3ayyan keda

law 7`alas hane7`tar blel i s A yeb2a el flywheel heyya elly forsetha (Y)
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