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

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Presentation on theme: "Tutorial for Psyc0226 Wei Fang, Ph.D., Professor Dept. of Bio-Industrial Mechatronics Engineering National Taiwan University Software last updated: 2002/02/26."— Presentation transcript:

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 Abbreviations of thermodynamic properties of moist air used in Psyc Tdb: dry bulb Temp. 2. RH : relative humidity 3. Twb: Wet bulb Temp. 4. Tdp: dew point Temp. 5. AH : absolute humidity 6. SV : specific volume 7. Hfg: Saturated 8. DOS: degree of Saturation 9. Pws: saturated vapor pressure 10. 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 3. List the values 2. Set the intervals

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

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

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

12 Table 4: VPD of air

13 VPD/AHD of air – –

14 Table 5: VPD of air

15 VPD/AHD of air VPD – AHD –

16 Psycharts 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) TwbRHTdpAHSVHhfg DOS PwsPw TdbIP 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 1.To define 2nd state, change from Inactive to Active first. 2.Click in the Psychart window at the selected state or click on the crosshair region to move along constant lines or curves. 3.Click on Cal. to calculate the difference.

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

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) VPD Enter Leaf temperature, then click on Draw icon.

29 Other user friendly designs

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

31

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 Please send us information regarding found bugs. Mail to :


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