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MATLAB based design software for greenhouse evaporative cooling system Wei Fang Dept. of Bio-Industrial Mechatronics Engineering National Taiwan University.

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Presentation on theme: "MATLAB based design software for greenhouse evaporative cooling system Wei Fang Dept. of Bio-Industrial Mechatronics Engineering National Taiwan University."— Presentation transcript:

1 MATLAB based design software for greenhouse evaporative cooling system Wei Fang Dept. of Bio-Industrial Mechatronics Engineering National Taiwan University

2 Objective –Develop Software for the design of pad and fan system

3 Misleading catalogue information

4 Pad & Fan is powerful, but can not create miracle

5 Pad&Fan is useful in Taiwan, all thought Taiwan is considered High T and RH ∵ High T and high RH does not co -exist at most of the time

6 Required good design & Maintenance

7 Proper design Bleed off end Bleed off tube to floor drain or outside

8 wet bulb depression Typical WBD (wet bulb depression) of plain area in Taiwan

9 Max. T drop using Fad&Fan in Taiwan oCoC % WBD (Wet Bulb Depression) = dry bulb Temperature – wet bulb Temperature T = WBD * Efficiency

10 Software development Tool MATLAB (Mathworks, USA) Popular among Engineers Recent Textbook in Agr. Eng. –Takakura and Fang (2002) : Climate under cover -- dynamic simulations of bio- engineering systems using MATLAB. Kluwer Academic Publisher. –Cundiff and Mankin (2003) : Dynamics of biological systems. ASAE.

11 PFD (Pad_Fan_Design) Input : Dimension of GH Design criteria Number of fans Types of Pad Output : System operating curves Fan curves & pressure drop curves Drawings of GH in 3D Length of Pad required Flow rate of P ump Size of S ump Makeup water required

12 PFD window 1 Enter GH dimension –Metric,or English units Type of roof –3 types available Interval between posts No. of bays per post Misc.

13 PFD window 2 Select 1 algorithm out of 3 –NGMA/ACME –Munters –Air change ROT

14 PFD window 3 Number of fan required (guess value) (guess value) –9 models of Euromme fans Select type of pads –4 types available Design facing velocity Extra pressure drop Required pad area, length Calculated pump flow rate Calculated sump size Calculated makeup water

15 PFD window 3 Display Fan & pad curves In m 3 /s, in m 3 /m 2 /min In m 3 /s, in m 3 /m 2 /min Display GH in 3D Show more info. on Pads

16 Operating pt.

17 GH with Gable roof

18 GH with circular arch roof

19 GH with saw-tooth roof

20 Zoom out GH

21 Rotate in 3D

22 More info. on Pads

23 More info. On pads (cont.) Pressure drop of pad under various wind speed Pad efficiency under various wind speed

24 Fool proof design

25 Conclusion 1 The software developed can be served as teaching/research/design tool. The software allows users to pick their options from currently available commercial products most popular in Taiwan, including : –9 fans , 4 pads –3 roofs , –3 design criteria

26 Conclusion 2 The software provide fool proof design , including : –Interval between fans installed to check too much or too little fans –Comparison on Pad length and GH length The software provide flexible outputs , including : –Fan curves, pad curves and system operating point –GH drawings in 3D and allow for rotate,zoom in and out –P ump, sump, makeup water requirement


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