1. Tutorial for Psyc0226 Wei Fang, Ph.D., Professor
Dept. of Bio-Industrial Mechatronics Engineering
National Taiwan University
Software last updated: 2002/02/26
Tutorial last updated: 2003/11/28

2. Capability of Psyc0226 Allow alteration on atmospheric pressure
Provide handy PsyTables
Totally 11 tables are available
Provide PsyCharts
State calculation: besides AtmP, values of 2 independent states are required to calculate others
Process calculation: find differences between 2 states
More process calculation:
Evaporative cooling
Vapor pressure deficit on leaf

3. More message of the selected cell
Abbreviations of thermodynamic properties of moist air used in Psyc0226
Tdb: dry bulb Temp.
RH : relative humidity
Twb: Wet bulb Temp.
Tdp: dew point Temp.
AH : absolute humidity
SV : specific volume
Hfg: Saturated
DOS: degree of Saturation
Pws: saturated vapor pressure
Pw: vapor pressure
More message of the selected cell

4. Block in red defined as Psychart window

5. Set the Atmospheric pressure is the first step

6. Handy PsyTables

7. Totally 11 PsyTables

8. User friendly 3-step design in PsyTable
1. Define the ranges
2. Set the intervals
3. List the values

9. Table 1: Twb = f(Tdb, RH)
Twb
RH (50 – 100%)and Tdb (20 – 44 oC)

10. Wet Bulb Depression is the limit of evaporative cooling methods.
Table 2: WBD = f(Tdb,RH)
WBD
Wet Bulb Depression is the limit of evaporative cooling methods.

11. Table 3: RH = f(Tdb,Twb) RH
Twb (20 – 44 oC) and Tdb (20 – 44 oC)

12. Table 4: VPD of air

13. VPD=Pws@Tdb – Pw@Tdb AHD=Sat.AH@Tdb – Sat.AH@Tdp
VPD/AHD of air

14. Table 5: VPD’ of air

15. VPD’=Pw@Twb – Pw@Tdb AHD’=Sat.AH@Twb – Sat.AH@Tdp
VPD’/AHD’ of air

16. Psycharts Evaporative cooling process calculation
Besides atmospheric pressure, values of 2 independent states are required to derive others
find differences between 2 states
Evaporative cooling process calculation
Vapor pressure deficit on leaf

17. State Calculation

18. Independent Properties (IP)
Twb RH
Tdp AH SV H
hfg
DOS
Pws Pw
Tdb IP
Any pair of IP can be the given values to derive others.

19. One click in Psychart window using left button of the mouse can define a state

20. Process Calculation

21. Use mouse to define 2 states
To define 2nd state, change from ‘Inactive’ to ‘Active’ first.
Click in the Psychart window at the selected state or click on the crosshair region to move along constant lines or curves.
Click on ‘Cal.’ to calculate the difference.

22. Move along prefix lines or Curves
Constant Twb
Constant Tdb
Constant RH
Constant Tdp, Pw, AH
Constant Tdp, Pw, AH
Constant RH
Constant Tdb
Constant Twb

23. A process with sensible heat gain

24. Process: between states
Sensible Heating (3->4)
Sensible Cooling (4->3)
Humidification (4->5)
Dehumidification (5->4)
Heating (3->5, 3->1)
Cooling (5->3, 1->3)
Air Mixing (1, 2->3)
Evaporative Cooling，Drying (1->2, 1->3)
Combination of above (1->2->3->4->5)

25. Evaporative cooling process

26. Enter ‘Tdb after pad’ or ‘pad efficiency’ to derive others followed by a Click on ‘Draw’ icon.
WBD

27. Temperature drop after passing through pad (ΔT)
ΔT = WBD of outdoor x Efficiency of the pad T
T- ΔT

28. Vapor pressure deficit (VPD)
Enter Leaf temperature, then click on Draw icon.
VPD

29. Other user friendly designs

30. Lines and curves can be visible or hidden by (de)selecting related icons

32. Zoom in & out

33. Labels in Psychart window can be hidden by de-select the Unit label icon

34. The state user defined in the psychart window using left button of the mouse will be placed in the center of the psychart window if the Centralize icon was selected. This option is set inactive by default.

35. Enjoy playing with Digital Psychart
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