functionCalculTsky_withRH

Compute the sky temperature knowing the relative humidity

Information

This function returns the sky temperature from the water vapor pressure and the dry bulb temperature.

Hypothesis and equations

This function returns the sky temperature based on the following equation:

T_ciel=94+12.6*ln(P_vap)-13*K_t+0.341*T_seche

with:

  • Kt defined as the ratio between the global horizontal received to the ground and the global horizontal received outside atmosphere.
  • Pvap the water vapor pressure.

Bibliography

Longwave sky radiation parameterizations , M. Aubinet, Solar Energy n°53 (version 2) pp. 147-154, 1994

Instructions for use

none

Known limits / Precautions for use

This sky temperature estimation is more precise than the one obtained with CalculTsky_withoutRH model.

Of course, there are other correlations to calculate the sky temperature.

Validations

Validated model - Amy Lindsay 03/2014

--------------------------------------------------------------
Licensed by EDF under a 3-clause BSD-license
Copyright © EDF 2009 - 2023
BuildSysPro version 3.6.0
Author : Amy LINDSAY, EDF (2014)
--------------------------------------------------------------

Inputs

TypeNameDefaultDescription
Modelica.Units.SI.TimetTime
RealT_secheDry bulb temperature [K]
Real[10]GSolar information vector
RealPvapWater vapor pressure [Pa]

Outputs

TypeNameDefaultDescription
RealT_cielSky tempereture [K]