A simple evaluation of global and diffuse luminous efficacy for all sky conditions in tropical and humid climate

TL;DR

This study evaluates global and diffuse luminous efficacy in a tropical humid climate using 6 months of measured data, developing empirical models for different sky conditions to estimate illuminance from solar irradiance.

Contribution

It provides initial luminous efficacy values and empirical models specific to tropical humid conditions, filling a gap in existing literature.

Findings

Empirical constants for different sky conditions are established.

Models show good agreement with measured data.

Luminous efficacy varies with sky conditions and time of year.

Abstract

This paper presents initial values of global and diffuse luminous efficacy at Saint-Pierre (Reunion Island). Firstly, data used were measured for a period of 6 months, from February to June 2008. During this period, all defined day-types have been studied (clear, cloudy and intermediate). Generally, the meteorological database of Reunion does not contain information for illuminance values. On the other hand, the local meteorological center has a 60-years-old database for solar irradiance (W.m-2). So it is important to determine Luminous Efficacy in order to find illuminance from solar irradiance (or luminance from solar radiance). The measured data were analyzed, and empirical constant models were developed and presented in this paper in order to determine luminous efficacy under different sky conditions. A comparison between these empirical constants (models) and existing models has been made. The method used to define sky conditions (overcast, intermediate and clear) and day-types characterization as well as classification will be presented in this work.