Tutorial for MATLAB based V.E.T.H. Wei Fang, Ph.D., Professor Dept. of Bio-Industrial Mechatronics...

Tutorial for MATLAB based Tutorial for MATLAB based V.E.T.H.V.E.T.H.

Wei Fang, Ph.D., ProfessorWei Fang, Ph.D., ProfessorDept. of Bio-Industrial Mechatronics Dept. of Bio-Industrial Mechatronics

EngineeringEngineeringNational Taiwan UniversityNational Taiwan University

Last updated: 2005/5/28Last updated: 2005/5/28

To startTo start

Unzip ‘veth.zip’ and copy all files to one Unzip ‘veth.zip’ and copy all files to one directory, say: ‘veth’directory, say: ‘veth’

Assign ‘current directory’ of MATLAB to that Assign ‘current directory’ of MATLAB to that ‘veth’ directory.‘veth’ directory.

Enter ‘VETH’ in the command window of Enter ‘VETH’ in the command window of MATLAB. Press ‘Enter’, 2 pop-up windows MATLAB. Press ‘Enter’, 2 pop-up windows and 1 Figure window will appear.and 1 Figure window will appear.

1st pop-up window

• This main window deal with assigned environmental conditions.

• One out of 6 outdoor conditions can be selected. – First 5 conditions use default

values – Last option allows user to

assigned all values.

• User can assign V and E values with entering specific numbers.

2 pop-up windows

• This pop-up window deals with UA calculation of a user assigned greenhouse.

• Various of roof type and glazing for roof and wall can be assigned.

5 default conditions5 default conditions

1.1. Hot, no shading, with fan systemHot, no shading, with fan system

2.2. Hot, 50% shading, with fan systemHot, 50% shading, with fan system

3.3. Hot, full shading (no sun), with fan systemHot, full shading (no sun), with fan system

4.4. Very hot, dry, no shading, with fan systemVery hot, dry, no shading, with fan system

5.5. Hot, no shading, with pad and fan systemHot, no shading, with pad and fan system

6.6. User assignedUser assigned

Figure for condition 1

Figure for condition 2

Figure for condition 3

Figure for condition 4

Figure for condition 5

Figure for condition 6

Family curves of Ventilating rate

Family curves of Evapotranspiration rate

Outdoor condition at T=32 oC, RH=52%

Indoor condition for given V=1 and E=5

E value is the sum of model-based values

listed in 2 cells

1. Based on fogging calculation

2. Based on Evapotranspiration models

Press button to invoke the model.Press button to invoke the model.

Fool proof design

• This value is for reference only.

• User still need to enter the value.

Evaporation generated from fogging

Evapotranspiration models

The EndThe End