Design and experimental study of a low-cost prefab Trombe wall to improve indoor temperatures in social housing in the Biobío region in Chile

Abstract

A renewed interest in bioclimatic strategies for building retrofitting is noticed due to the fact that more than 40% of the total annual world energy consumption is used in buildings. In Chile, existing social housing stock is composed of more than 5,5 million units built with government subsidies. Thermal regulations improvement started in 2000, but solar passive strategies are still not present on the immediate retrofitting agenda. The Bioclimatic Prosthesis Project aims designing and developing prefabricated small scale passive solar systems to reduce energy use in social housing. The systems should moreover be affordable and easy to build and install. This paper focuses on one of these systems: an adaptable and low-cost prefabricated Trombe Wall (TW) with a vertical storage system. Also testing mobile insulation during winter nights and external shading during summer. The system was built and installed in a test cell designed to represent the most used area of a social housing unit in the region. Thermal efficiency of the TW was monitored using sensors and compared to a similar test cell situated on the same site without the component. Two different microclimate scenarios in a coastal city and in the interior valley were tested.The study shows that this addable TW can reduce energy demands and winter firewood consumption by nearly 33%, increasing indoor temperature with 5℃ in the better cases measured. It was moreover noticed that the developed component also reduces cooling demands during summer, overheating problems can be solved completely adding optimized external shading element.

Effect of Freeze Crystallization on Quality Properties of Two Endemic Patagonian Berries Juices: Murta (Ugni molinae) and Arrayan (Luma apiculata)

“…These results were lower than the ones reported by Ramirez [ 50 ], who reported the phenolic compounds content profile of six small berries from the VIII Region del Bio-Bío of Chile. However, the differences in TBCC values between the studies might be explained by the different harvest areas, since the VIII Region del Bio-Bío has dry temperate climates in summer and rainy temperate climates in winter, and thus, the temperature varies from 0 to 30 °C throughout the year, while the Southern Chile has constant rains and low temperatures throughout the year [ 38 , 51 , 52 ]. Hence, the climatic conditions and geographical characteristics contribute to various differences on fruit maturation, and in addition, other factors such as genetic and species variabilities, harvesting year, and growing season affect the phenolic compounds content in final fruits [ 53 ].…”

Um panorama sobre a utilização de células-teste para estudos de campo em pesquisas na área da construção civil

“…Quanto aos elementos de cobertura destacam-se as avaliações do desempenho térmico de novos materiais como tintas reflexivas (HERNÁNDEZ-PÉREZ et al, 2017), novas composições de argamassas (ALAVÉZ-RAMIREZ et al, 2018) ou ainda sistemas de ventilação natural (TZUC et al, 2019). Dentre as investigações de elementos de vedação vertical são comuns os testes com materiais locais que remetem à arquitetura vernacular, como adobe e palha (HUARZA et al, 2018;WHITMAN, 2012), além da aplicação de estratégias para condicionamento passivo, como parede trombe e fachada dupla (ARGUTO et al, 2020;SÁNCHEZ et al, 2016). Ressalta-se ainda a revisão conduzida por Hernández-Pérez et al, (2014) com enfoque na coleta de pesquisas internacionais sobre materiais reflexivos aplicados no exterior de edifícios, classificando estas quanto ao método de investigação dentre os quais está o uso de células-teste.…”

Thermal Performance Analysis of Heat Collection Wall in High-Rise Building Based on the Measurement of Near-Wall Microclimate

“…Through experimentation, some scholars have proposed that the heat collection wall structure could reduce energy consumption [5][6][7][8], improve the thermal environment in winter and the indoor airflow during summer [9][10][11][12][13]. With the development of the heat collection wall technology, people have put forward a series of research optimization, such as the PV-Trombe wall [14,15], the optimization of the airflow cavity [16], the application of fin to strengthen heat transfer [17], prefabricated Trombe wall [18], the new system combined with the solar chimney [19], and the application of phase change materials [20], etc.…”