English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

A solar water heating system (SWHS) is a device that makes available the thermal energy of the incident solar radiation for water heating. The use of solar energy in buildings reduces electrical consumption. In this research, a technical and economic feasibility analysis was performed on a system using solar and gas as energy sources in a residential building. The system was studied operating with 47 flat solar collectors, two thermal reservoirs of 5,000 liters under forced convection and an auxiliary system with 4 passage gas heaters. The technical analysis over 12 months showed that the system has operated with solar fraction between 48-88% and thermal efficiency of 47-73%. Concerning the economic analysis, methods of financial mathematics, such as Net Present Value (NPV), Internal Rate of Return (IRR) and Payback were applied. The data collected demonstrated that the SWHS with gas support was feasible, it also showed positive NPV, IRR superior in relation to the rate of attractiveness; and investment recovery (Payback) in less than 8 years considering a 20-year lifetime of the system. The temperatures of SWHS were monitored showing that the lack of maintenance can generate high levels of energy loss and cost because of the gas consumption.

Avaliação técnica e viabilidade econômica de um sistema de aquecimento solar em um edifício residencial