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Coimbra City Case Study

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3. CASE STUDY
Since the research is trying to determine the effectiveness of natural ventilation condition in existing building, the researchers have tried to analyze 30 old residential buildings in Coimbra city centre. Since the old city centre of Coimbra has a very characteristic building typology and, which is similar to other old centres of Portuguese cities, the case studies of research were selected from Rua das Padeiras at Coimbra city centre in order to know its properties, facades and envelope orientation. The results of these analyses were used to find the average area of each element and get a building dimensional typology that we believe, is representative of the Coimbra’s historical buildings. After finding the properties of the …show more content…

The building is located in the central region of Portugal where average temperatures in the winter range from 5C (night) and 15C (day). In the summer, the average temperatures range from 16 C during the night and 29 C during the day. Solar radiation levels in this city are about 1650 kWh/m2/year (http://solargis.info/)
4. RESULTS
The main results from the integrated assessment are discussed and presented in this section. This section describes how this simulation method was used to analyze the effectiveness of natural ventilation condition in existing buildings by computed distributions of air temperature, velocity, and air flow. As it was already explained, the research has been developed to understand the thermal comfort level (section 4-1), indoor air flow (section 4-2) of the reference building with the existing condition (materials, services and living style).
Thermal Comfort …show more content…

In the second step has been trying to compare the obtained numerical results of simulation tools with the mathematical models, and PPD in different existing models. To do so, the online software of comfort calculator ISO7730 [30] and CBE thermal comfort tools [35] based on the ASHREA 55/2013 [23] were used. The result of comfort calculator ISO 7730 [15] is 1.35 for the level of PMV and 49.8% for the PPD. Also, the result of CBE based on the ASHREA 55/2013 [23] is 1.28 for PMV and 42% for PPD level. Consequently, the building has an uncomfortable condition in thermal comfort point of view. As a final step, the comparison between the numerical results of PMV by DBS simulation tools and the mathematical models shows that the results of all simulation tools are quite close to the real condition of the buildings and they are

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