Comportamento Termoenergético de Edificação Histórica com Novo Uso na Cidade de Pelotas: O Caso do Casarão 02 – Secretaria Municipal da Cultura.

Abstract

The city of Pelotas is considered as heritage of Rio Grande do Sul State with its amount of eclectic style buildings that resemble wealth times resulting from the economy based on the trade of jerky beef. Many of these buildings, which were built for residential purpose, are still being used and have kept their architectural features over time. In order of encourage the use of historic buildings, for several activities, one hypothesis that should be verified is the potential god thermal energy performance. This dissertation aims to assess the thermal energy behavior of a historic building with new use located in downtown of the city of Pelotas, such as to verify the effects of potential corrective measures to increase thermal comfort and energy efficiency levels. The building in study is the old Residence of Charqueador José Vieira Vianna, also known as House 2. Located at Coronel Pedro Osório Square, number 2, it is nowadays, the address of the Municipal Department of Culture. For both, the research method was divided in seven steps: characterization of the object, configuration of the model and simulation of the base case, proposition of 64 corrective measures, simulation of 65 models, analysis of thermal performance, analysis of energy efficiency, economic evaluation of the corrective measures. The chosen evaluation tool is the computer simulation software DesignBuilder (version 3.0.0.105). Evaluations of thermal performance consider the adaptive model of De Dear and Brager for ASHRAE Standard – 55 (2010). The energy efficiency was analyzed by degree-hours and by RTQ-C – Technical regulation of quality of energy efficiency level of commercial, service and public buildings – natural ventilated building simulation method. The original model obtained thermal comfort in 69,50% of the occupied hours, for 80% of acceptability. For energy efficiency analysis it obtained 333 degree-hours for heating and 1.587 degree-hours for cooling, also for occupied hours. For RTQ-C, the evaluation for natural ventilated building considered POC (percentage of occupied hours within comfort) for the verification of the efficiency level, that resulted in a total score of 3,34, C level. The 64 simulated improvement proposals obtained results varying from better to worse, comparing to the original building, whereas the improvement of the lighting system already raised the original building to B level. The best proposal, number 03 – white insulated roof and original walls –, obtained energy efficiency classification level A, with 79,43% of the occupied hours within acceptable comfort limits. It is evaluated and compared to the original building, as for economic issue, where simple payback and cost of saved energy are verified.