statistical and physical analysis of the external factors perturbation on solar radiation exergy统计和物理分析外部因素扰动的太阳辐射(火用).pdf

Entropy 2003, 5, 452-466 452 Entropy ISSN 1099-4300 /entropy/ STATISTICAL AND PHYSICAL ANALYSIS OF THE EXTERNAL FACTORS PERTURBATION ON SOLAR RADIATION EXERGY (1) (2) (3) Juan Carlos Moreno P , Javier Cañada PP and José Vicente Boscà PP P (1) and (3) P Applied Physics DepartmentPP (2)Applied Thermodynamics Department Universidad Politénica de Valencia; Cno.de Vera s/n 46071 Valencia (Spain) (1) E-mail: jcmestev@fis.upv.es;U Fax: (34) 963877329U (2) E-mail: jcanada@ter.upv.es;U U (3) E-mail : jvbosca@fis.upv.esTU UT Received: 8 November 2002 / Accepted: 9 August 2003 / Published: 31 December 2003 ABSTRACT The purpose of this paper is to analyze the external factor perturbations on solar radiation. Firstly, the influence on the photon distribution function in the space of frequencies is analyzed and, later, the modification generated in equations of internal energy, entropy, and radiation is viewed in order to deduce an expression to calculate the spectral exergy of perturbed radiation Keywords: exergy, blackbody radiation, internal energy, entropy. 1. INTRODUCTION Taking into account the negative perspective of our planet’s energy resources, the exploitation of solar energy is becoming an urgent need. In order to improve the harnessing of solar energy it is essential to develop an in-depth theoretical knowledge of radiation to understand its behaviour. The present paper analyses extraterrestrial solar ra