pvl_sapmcelltemp
Estimate cell temperature from irradiance, windspeed, ambient temperature, and SAPM module parameters.
Contents
Syntax
Tcell = pvl_sapmcelltemp(E, E0, a, b, windspeed, Tamb, deltaT)
[Tcell Tmodule] = pvl_sapmcelltemp(E, E0, a, b, windspeed, Tamb, deltaT)
Description
Estimate cell and module temperatures using the Sandia Array Performance Model (SAPM) [1], when given the incident irradiance, wind speed, and ambient temperature.
The cell temperature model is
where
is the cell temperature (C).
is the module backsurface temperature (C).
is the ambient air temperature (C).
is the wind speed (m/s).
,
and
are parameters.
Inputs
- E - Total incident irradiance in W/m^2. E must be a scalar or a vector of the same size as windspeed, and Tamb. Must be >=0.
- E0 - Reference irradiance used when determining delta T, in W/m^2. E0 must be a scalar. Must be >=0. Typically equals 1,000 W/m^2;
- a - SAPM module parameter for establishing the upper limit for module temperature at low wind speeds and high solar irradiance (see SAPM eqn. 11). Must be a scalar.
- b - SAPM module parameter for establishing the rate at which the module temperature drops as wind speed increases (see SAPM eqn. 11). Must be a scalar.
- windspeed - Wind speed in m/s at a height of 10 meters. windspeed must be a scalar or a vector of the same size as E and Tamb. Must be >=0;
- Tamb - Ambient dry bulb temperature in degrees C. Tamb must be a scalar or a vector of the same size as windspeed and E. Must be >= -273.15.
- deltaT - SAPM module parameter giving the temperature difference between the cell and module back surface at the reference irradiance, E0. Must be a numeric scalar >=0.
Outputs
- Tcell - A column vector of cell temperatures in degrees C.
- Tmodule - A column vector of module back temperature in degrees C.
Example
Calculate cell temperature for a typical glass/cell/polymer sheet module mounted on an open rack. a, b, and deltaT parameter from [1], Table 1. Sample weather conditions are used.
deltaT = 3; a = -3.56; b = -0.075; E = 800; % Incident irradiance E0 = 1000; windspeed = 5; %5 m/s Tamb = 10; %10 deg C Tcell = pvl_sapmcelltemp(E, E0, a, b, windspeed, Tamb, deltaT)
Tcell = 28.0366
References
[1] King, D. et al, 2004, "Sandia Photovoltaic Array Performance Model", SAND2004-3535, Sandia National Laboratories, Albuquerque, NM Web Link
See Also
Copyright 2014 Sandia National Laboratories