Ventilation system in greenhouse

- VENTILATION SYSTEM IN GREENHOUSE

1. TOPIC :- VENTILATION SYSTEM IN GREENHOUSE COURSE TITLE :- PROTECTED CULTIVATION OF HIGH VALUE HORTICULTURAL CROPS COURSE NO. :- HORT-414 CREDITS HOURS :- 3(1+2) YEAR/SEMESTER :- 4 RD YEAR / 2 ST SEMESTER SUBMITTED TO SUBMITTED BY shri . R.K. DEWANGAN MR.AKHLESH JAISWAL ( COURSE TEACHER) PRESENTATION ON

2. VENTILATION SYSTEM • Definition - a means of changing the air in an enclosed space to . Keep fresh air for respiratory system Preserve correct level Of Oxygen in the air Control Carbon Dioxide Control the moisture level Lowering the heat level Remove dust and odors

3. Requirements for an acceptable amount of fresh air supply in buildings will vary depending on the nature of occupation and activity. Air changes per hour or ventilation rate is the preferred criteria for system design. SYSTEM OF VENTILATION

4. Natural ventilation Definition - the process of supplying and removing air through an indoor space without using mechanical systems. It refers to the flow of external air to an indoor space as a result of pressure or temperature differences The benefits of natural include:- Improved Indoor air quality (IAQ) Energy savings Reduction of greenhouse gas emissions Increased worker productivity

5. WIND EFFECT STACK EFFECT COMBINATION EFFECT

6. MECHANICAL VENTILATION SYSTEMS Definition - Circulate fresh air using ducts and fans rather than relying on airflow through small holes or crack’s in a home’s wall, roof or windows. Benefits of using mechanical ventilation:- Better indoor air quality –can remove pollutants, allergens, and moisture that can cause mold problems More control – provide proper fresh air flow along with appropriate locations for intake and exhaust Improved comfort – allow a constant flow of outside air into the home and can also provide filtration, dehumidification, and conditioning of the incoming outside air.

7. COMPUTERS • Now-a-days, computer control systems are common in greenhouse • Computer systems can provide fully integrated control of temperature, humidity, irrigation and fertilization, CO2, light and shade levels. • A computer can control hundreds of devices within a green house by utilizing dozens of input parameters, such as outside and inside temperatures, humidity, outside wind direction and velocity, CO2 levels and even the time of the day or night.

8. • Computer systems receive signals from all sensors, and end appropriate commands every minute to each piece of equipment in the greenhouse. • A computer produces graphs of past and current environmental conditions both inside and outside the greenhouse complex.. • Computers can only assist by adding precision to the overall greenhouse production practice, and they are only as effective as the software it runs and the effectively of the operator.

9. Advantages 1. The computer always knows what all systems are doing and, if programmed properly, can coordinate these systems without overlap to provide the optimum environment. 2. The computer can record the environmental data, which can be displayed to show current conditions or stored and processed ones to provide a history of the cropping period, and if desired it may also be displayed in table or graph form. 3. A high-speed computer with networking facility can control several remotely located greenhouses , by placing the computer in a central area and the results can be monitored frequently by the management .

10. 4. With proper programming and sensing systems, the computer can anticipate weather changes and make adjustments in heating and ventilation systems, thus saving the energy. 5. The computer can be programmed to sound an alarm if conditions become unacceptable to and to detect sensor and equipment failure. Disadvantages 1. High initial cost investment. 2. Requires qualified operators. 3. High maintenance, care and precautions are required. 4. Not economical for small scale and seasonal production.

11. THANKS FOR ATTENTION