Abstract
Earth-air heat exchangers (EAHE) represent a promising option to reduce theheating/cooling load of buildings. Unlike traditional air conditioning systems, the EAHE employ a renewable source of energy and they can work using low electric power. Basically, EAHE employ underground ducts where the air is blown to exchange heat with the ground. Since the superficial layers of the Earth are warmer than outside air in winter and cooler than it in summer, the soil canbe used as a heat source or sink. Therefore, the air leaves the ducts at milder temperatures. Recent research has shown that the Brazilian south region, where prevails a subtropical climate, has a high potential for the use of EAHE. However, such references are still very limited. Hence, this work aims to analyze the thermal performance of EAHE considering the city of Pelotas, located in the south Brazilian state of Rio Grande do Sul. As a case study, we used in situ data, covering thesoil geotechnical profiles from a site in the city, which were obtained by a standard penetration test (SPT). To make the computer simulations, we used an analytical model, which was previously tested and validated. The results point out good prospects for the installation of these devices in the city of Pelotas, taking advantage of its geological potential
Highlights
As pointed out in (SILVA; PAULA, 2009), the global warming is a widespread climatic phenomenon
Case study, is used data from a site called Trevo do Contorno, whose geographical coordinates are (31o45 24.8 S and 52o26 2.6 W). It were obtained with a local building company, called FUNDACON-Fundações e Construções, which performed there a Standard Penetration Test (SPT) in 2016
This article began detailing an analytical model for earth-air heat exchangers (EAHE), which was compared with a numerical one, taking into account data from an experimental installation in the south Brazilian city of Viamão
Summary
As pointed out in (SILVA; PAULA, 2009), the global warming is a widespread climatic phenomenon. Among their causes, we find anthropogenic factors such as the greenhouse gas emissions from burning fossil fuels (mainly coal and oil products), the impacts of industries, refineries, engines, human caused fires, etc. We find anthropogenic factors such as the greenhouse gas emissions from burning fossil fuels (mainly coal and oil products), the impacts of industries, refineries, engines, human caused fires, etc In this scenario, a vital role is played by increasing energetic demands of growing populations and their needs of economic development (AGRAWAL; MISRA; AGRAWAL, 2020). It is worthy to say that the EAHE can work using low powered fans, which reduces significantly the energy consumption with air conditioning
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