Date of download: 12/19/2017 Copyright © ASME. All rights reserved. From: Theoretical Comparison of Solar Water/Space-Heating Combi Systems and Stratification Design Options J. Sol. Energy Eng. 2007;129(4):438-448. doi:10.1115/1.2770752 Figure Legend: Left: annual net utilized solar energy as a function of the solar collector area and heat storage volume; right: extra annual net utilized solar energy from stratifiers as a function of the solar collector area and heat storage volume. The annual thermal performances are shown for system model 1 and a step-by-step improvement of the system model