Characteristic equation development for double slope solar distiller unit augmented with n identical parabolic concentrator integrated evacuated tubular collectors

Abstract

This paper communicates the analytical equation development for double slope solar still coupled with a number of alike parabolic concentrator integrated evacuated tubular collector (NPCETCDS) which is also valid for evacuated tubular collector integrated double slope solar distiller unit (NETCDS) as well as passive double slope solar distiller unit (PDS). The developed equation is similar to Hottel-Whillier-Bliss equation which was developed for flat plate collector. The analytical equation development for NPCETCDS involves the writing of equations for its different components on the ground of equating net energy input to net energy output. The results obtained for the proposed NPCETCDS have been compared with results of NETCDS and PDS. It has been concluded that the average value of instantaneous efficiency for NPCETCDS is higher by 46.18% and 56.99%; and daily exergy is higher by 81.17% and 92.25% than the corresponding values for NETCDS and PDS for the same basin area in that order. © 2020 Desalination Publications. All rights reserved.