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Darwish Al-Arafati 86949

Nasr Al-Abdali 86996

Greenhouse Humidity Control

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Outline• Introduction• Project Overall (Problem, Specifications and

Constraints).• Project Design and its principle. • Sensor Specifications.• Project and market Product Comparison.• Conclusion• References

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Project Objective:In the greenhouse the humidity level is very important as a very humid atmosphere may be harmful to some plants because the rate of transpiration and evaporation is reduced in a very humid conditions, and these plants my suffer damage from overheating unless you use the ventilation to bring into the greenhouse cooler and drier air. On the other hand, many tropical plants from native humid climates require high levels of humidity for a healthy growth and will not survive in a dry atmosphere. That is why Controlling Humidity needed!.

Introduction:One of the biggest challenges in maintaining a greenhouse is humidity control. Most plants enjoy a humidity of 50 to 60 percent, and this is a challenge to manage at times. The main goal is to avoid condensation on plants, which promotes mold and fungus growth. Low humidity leads to leaf dehydration, more frequent watering and pest infestation.

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Humidity level in Green Houses may

affect plants growth..

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Economical:[ Total Cost is equal Nearly 8$]

Environmental: No ImpactHealth and Safety: It does not

affect them.Social and Cultural: System is

acceptable.Performance: Fast System

Response

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• Performance: Accurate and It has Very Fast Response....• Functionality: System Will check Voltage across the Sensor ,so valid action will be done• Operational: System can work on the environment on which temperature lie between 10 to 60°C.

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ConstraintsProblem Statement

Specifications

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How Does it work?!!

1k Ohms

230 Vac

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Component Name CostHS 1101 (HUMIDITY SENSOR) 4.6

2 Comparators Operational Amplifier 1.36$2 Relays 1.4$

4 Resistors 0.4$

Total Cost 7.76$

Project Cost

1$≈0.385 O.R

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Humidity Sensor Specifications

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Farm Greenhouse Humidity Controller Product Compared With Project Design

Comparison Side Project/ Greenhouse Humidity Controller

Farm Greenhouse Humidity Controller

Resolution Lower Higher

Measuring range

+0.1% RH/°C10 to 60°C

+1% RH/°C-40C~+85C  

Cost 8$ 35$

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How to Improve Design?

•Using accurate components.

•Highly Sensitive Humidity sensor.

•Using Microcontroller instead of Comparators.

•Avoid using long wires and poor cables.

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References-http://www.ehow.com/how_2107526_manage-humidity-greenhouse.html-http://fogco.com/applications/greenhouse-http://www.ryanguitars.com/NewsandEvents/Guitar_tech_tips/Humidity_Chart.htm

Conclusion:Humidity can be controlled easily using 2 comparators with few resistors and a sensor.45% of Humidity is perfect one for plants growth. By means of Humidity Absorption and Air Humidifier, Humidity is going to be controllable and being balanced to be 45% in the air.