Differences

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--- apps:biomet_pet [2022/07/31 17:03] – [PET and PET* (PET Reviewed)] enviadmin
+++ apps:biomet_pet [2022/12/02 13:01] (current) – [PET* (PET Reviewed) [Winter 22/23]] enviadmin
@@ Line 22: / Line 22: @@
 Main changes in ENVI-met BIO-met compared to original PET in short are:
   * For the indoor setting, the turbulent exchange coefficients for heat and vapour are calculated using the indoor air velocity instead of keeping them at the outdoor value
-  * The sweat rate and the amount of sweat on the skin is set to zero when starting calculating the indoor environment
+  * The sweat rate and the amount of sweat on the skin is set to zero when starting calculating the indoor environment. It will start again if the reference temperature of the body $T_B=0.2 \cdot T_{skin}+0.9 \cdot T_{core}$ is above the sweating set point, here 36.34 °C.
+For other issues, see next section.
+==== PET* (PET Reviewed) [Winter 22/23] ====
+With the Winter 22/23 release, the whole PET module has undergone a review to fix a number of accumulated errors and inconsistencies. This includes
+some of the suggestions from Walther and Goestchel (2018)  plus several other improvements and changes.
+These modifications result in a PET* (for PET Reviewed) indicator which will show of course (again) differences to both the original and the corrected PET values already included in ENVI-met prior to Winter 22/23..
+The main changes are:
+  * For the indoor setting, the metabolic rate is set to the basal rate (approx. 80 W) plus the work load for walking with 0.1 m/s, regardsless of the outdoor activity set.
+  * The new metabolic rate impacts the breathing settings and engery fluxes which are not updated in the iterations
+  * The fraction of wet skin is resetted to zero before calculating the indoor environment (but might increase then again based on the sweat rate and the indoor humidity)
+  * The energy balance equation of the skin node was re-worked to take into account the changes above. In addition, the skin energy balance now only consists of Radiation and Convection from/to base skin parts plus conduction flux from/to clothing layer and no other components.
+  * Finally, the number of output variables has been extended now providing  //T Skin static (°C), T Core static (°C), T Cloths static (°C), Fraction Wet Skin, Sweat Rate (g/h), Radiative Budget Skin (W)// and //Convective Flux Skin (W)//.
-== PET* (PET Reviewed) ==
-The suggestions from Walther and Goestchel (2018)  plus several other improvements will be added to BIO-met in upcoming versions which will result in a PET* (for PET Reviewed) indicator which will show of course (again) differences to both the original and the ENVI-met corrected PET values.