Discomfort - Draught Rate - TESTO 400 Instruction Manual

The factors to be entered refer to ISO 7730 Appendix B and C.
We recommend using the following probes:
• Globe thermometer (0602 0743)
• IAQ probe (0632 1551 Bluetooth® / 0632 1552 cable / 0632 1550
probe head)
• Turbulence probe (0628 0152)
• Tripod (0554 1591)
Graphical representation
Element
1 PPD axis,
scaling from 0 – 100%
3 PMV axis
scaling from -3 to +3
5 Critical section of the curve
Formula for the display:
PPD = 100-95*exp (-0.03353*PMV

9.4.10 Discomfort - draught rate

With the turbulence probe 0628 0152 connected, the turbulence calculation for
the flow value is made possible on the basis of DIN EN 13779 and DIN EN
7730, as well as ASHRAE 55. The draught rate measures the air temperature,
fluctuation and standard deviation of the air velocity. From these three values,
the testo 400 calculates the percentage of dissatisfaction due to draughts.
Element
1 Calculated point from PPD and
PMV
4 Green section of the curve from -
0.5 to 0.5 PMV
4 – 0.2179*PMV²)
9 Operation
55