Abstract

The effects of the intensive use of fossil fuels on the climate, particularly the growing carbon dioxide emissions in the atmosphere and resulting global warming, are increasingly evident all over the world. Passive solar water heating collectors are an easy and low-cost way to reduce carbon dioxide emissions by replacing conventional with renewable energy through decentralized generation and investments. This chapter is a review of four types of passive solar water heating systems operating in the world: flat plate collectors, evacuated tube collectors, integrated collector storage allied to compound parabolic collectors, and hybrid photovoltaic/thermal collectors. The technological development of the collectors' components is the focus of the discussion, in view of the enhancement of their thermal performance and suggestions for some future trends.

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