Study of Clear Sky Models for Singapore

TL;DR

This paper compares and validates several clear-sky solar radiation models in Singapore to identify the most reliable one for efficient solar energy estimation in tropical regions.

Contribution

It provides a comparative analysis of popular clear-sky models specific to Singapore, including validation with actual solar irradiance data, to determine the most accurate model.

Findings

Identified the most reliable clear-sky model for Singapore.

Validated models against real solar irradiance measurements.

Provided insights into model performance in tropical climates.

Abstract

The estimation of total solar irradiance falling on the earth's surface is important in the field of solar energy generation and forecasting. Several clear-sky solar radiation models have been developed over the last few decades. Most of these models are based on empirical distribution of various geographical parameters; while a few models consider various atmospheric effects in the solar energy estimation. In this paper, we perform a comparative analysis of several popular clear-sky models, in the tropical region of Singapore. This is important in countries like Singapore, where we are primarily focused on reliable and efficient solar energy generation. We analyze and compare three popular clear-sky models that are widely used in the literature. We validate our solar estimation results using actual solar irradiance measurements obtained from collocated weather stations. We finally conclude the most reliable clear sky model for Singapore, based on all clear sky days in a year.