CAD Design

Here you can see and share tutorial of CAD Design.

Nutrient Film Technique

Nutrient Film Technique or NFT is a hydroponic technique whereby a very shallow stream of water containing all the dissolved nutrients required for plant growth is recirculated past the bare roots of plants in a watertight gully, also known as channels. Ideally, the depth of the recirculating stream should be very shallow, little more than a film of water, hence the name 'nutrient film'. This ensures that the thick root mat, which develops in the bottom of the channel, has an upper surface which, although moist, is in the air.

Greenhouse Technology

A greenhouse is a structure with a different types of covering materials, like glass or plastic roof and frequently glass or plastic walls; it heats up because incoming visible solar radiation (for which the glass is transparent) from the sun is absorbed by plants, soil, and other things inside the building.

The Stories

Read more about the stories of life, maybe you can get valuable lessons from these stories and can apply to your life .

CFD Analysis

Computational Fluid Dynamic (CFD) is one method to analysis moving of fluid internal or external room. This engineering tool can use analysis fluid at many aspect such as mechanical, civil, environment, till the agricultural aspect.

Showing posts with label Computational Fluid Dynamic. Show all posts
Showing posts with label Computational Fluid Dynamic. Show all posts

Wednesday, January 5, 2011

Nutrient Solution Pattern

1:44 AM Posted by Abdul Wahab | Comments (0)

It is nutrient solution pattern in NFT Beds which is simulated by CFD. The square indicated that the area of root zone.

Saturday, January 1, 2011

Abstract of Research

6:59 PM Posted by Abdul Wahab | Comments (0)


MATERIAL SELECTION ON NUTRIENT FILM TECHNIQUE (NFT) BEDS USING COMPUTATIONAL FLUID DYNAMIC  (CFD)

Abdul Wahhaab1, Herry Suhardiyanto1, and Ahmad Indra Siswantara2

1 Departement of Mechanical and Biosystem Engineering, Faculty of Agricultural Technology, Bogor Agricultural University, IPB Dramaga Campus, PO BOX 220, Bogor, West Java, Indonesia
2 Departement of Mechanical Engineering, Faculty of Engineering, University of Indonesia, Depok, West Java, Indonesia


ABSTRACT

Nutrient Film Technique (NFT) is one of hydroponic technology that nutrient solution circulate in a crop's root zone at anytime with 3 mm tickness.  A computer model has been developed to simulate the thermal distribution of NFT beds using Computational Fluid Dynamic (CFD).  The objective of this research are to develop a simulation model of moving heat flow of nutrients in the NFT bed in several types of materials with a CFD program and to determine the optimal type of materials in the design of beds.  The crop that is used as a object of a research is a tomato.  Tomato grown in two different beds, with and without zone cooling.  CFD use for simulate heat transfer on these beds and simulate on model of beds with several different materials.
The results showed that the distribution of nutrient solution temperature along the beds change over time follow the greenhouse temperature.  The simulation on different material of beds like PVC, fiberglass, glass, asbestos, porcelain, cement, and styrofoam showed that fiberglass is the highest temperature 28.9-32.3 oC and porcelain is the lowest temperature 28.9-31.2 oC. Otherwise, the lowest heat transfer coefficient is fiberglass and the highest is porcelain. High or low heat transfer coefficient will affect the release of heat from inside the beds to the environment.  According to analysis, the optimum of material which used for NFT beds design are cement, porselaian, and glass.


Keywords: Material, NFT Beds, CFD








For full paper, you can download it on 'download category'

CFD

3:02 AM Posted by Abdul Wahab | Comments (0)

Computational fluid dynamics (CFD) is a branch of fluid mechanics that uses numerical methods and algorithms to solve and analyze problems that involve fluid flows. Computers are used to perform the calculations required to simulate the interaction of liquids and gases with surfaces defined by boundary conditions. With high-speed supercomputers, better solutions can be achieved. Ongoing research, however, yield software that improves the accuracy and speed of complex simulation scenarios such as transonic or turbulent flows. Initial validation of such software is performed using a wind tunnel with the final validation coming in flight tests.

 
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