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As of now, in the EU, all new buildings will have to comply with the requirements for nearly zero energy buildings (nZEB). Portugal defines limits for the maximum useful energy needs for heating and for the maximum primary energy needs and establishes that 50% of primary energy needs must be covered by local renewable energy sources, based on the dwellings’ nominal condition of use. However, the actual use is different. Thus, a simulation tool is used to assess thermal comfort and energy needs for different conditions of use of a dwelling complying with nZEB requirements. Eight different locations are chosen, covering all Portuguese climate zones. The nZEB requirements lead to unusually high levels of thermal insulation, especially in the coldest regions, so special care must be taken by the designers to avoid overheating in summer. Without using HVAC system, some discomfort is found but comfort is possible with low energy consumption. Furthermore, the compliance with nZEB requirements proved to be enough to ensure that a significant percentage of useful energy needs for heating, cooling and domestic hot water is supplied by local renewable energy sources. This is key in order to overcome the high rate of energy poverty in Portugal.
Jaime Resende; Helena Corvacho. The nZEB Requirements for Residential Buildings: An Analysis of Thermal Comfort and Actual Energy Needs in Portuguese Climate. Sustainability 2021, 13, 8277 .
AMA StyleJaime Resende, Helena Corvacho. The nZEB Requirements for Residential Buildings: An Analysis of Thermal Comfort and Actual Energy Needs in Portuguese Climate. Sustainability. 2021; 13 (15):8277.
Chicago/Turabian StyleJaime Resende; Helena Corvacho. 2021. "The nZEB Requirements for Residential Buildings: An Analysis of Thermal Comfort and Actual Energy Needs in Portuguese Climate." Sustainability 13, no. 15: 8277.
Comfort in public spaces is essential to their attractiveness and continued role in improving human quality of life. Acceptable thermal conditions are determinant to ensuring users’ comfort. This study undertakes an assessment of three urban sites in Arouca, in the north of Portugal, using ENVI-met software. Simulations test the influence of pavement and façade covering material, vegetation, and site morphology. The climate of the region is classified as Mediterranean Csb, with rainy winters and dry and mildly warm summers. A typical summer day is considered. The results reveal that a combination of factors might lead to thermal discomfort even in this mild climate on an average day, mainly due to heat exchange by radiation. In addition, the impact of alterations to surface properties depends on the morphological characteristics of the site, e.g., high albedo of the pavement may lead to a decrease or an increase in mean radiant temperature, depending on the space. This variability is present in the effects observed at the studied sites. A high façade albedo always contributes, in these cases, to thermal discomfort. The conclusions of the present study highlight the importance of performing a specific study for each urban site whenever an intervention is to be planned.
Renato Soares; Helena Corvacho; Fernando Alves. Summer Thermal Conditions in Outdoor Public Spaces: A Case Study in a Mediterranean Climate. Sustainability 2021, 13, 5348 .
AMA StyleRenato Soares, Helena Corvacho, Fernando Alves. Summer Thermal Conditions in Outdoor Public Spaces: A Case Study in a Mediterranean Climate. Sustainability. 2021; 13 (10):5348.
Chicago/Turabian StyleRenato Soares; Helena Corvacho; Fernando Alves. 2021. "Summer Thermal Conditions in Outdoor Public Spaces: A Case Study in a Mediterranean Climate." Sustainability 13, no. 10: 5348.
Social housing represents a part of the whole building stock with a high risk of energy poverty, and it should be treated as a priority in renovation strategies, due to its potential for improvement and the need to fight that risk. Renovation actions are currently designed based on patterns that have been shown to be disparate from the reality of social housing. Thereby, a monitoring study is essential for the evaluation of the actual conditions. An in-depth characterization of a social housing neighborhood, located in the North of Portugal, was carried out. Indoor hygrothermal conditions were analyzed through a monitoring campaign. It was possible to identify the differences in indoor conditions of the dwellings and understand the influence of occupancy density and occupants’ behavior. In order to identify the actual occupancy and the type of use, a social survey was performed. A renovation action will soon take place, and a monitoring and survey plan is proposed for the post-renovation period, based on a previous evaluation of the renovation impact, using DesignBuilder software and the real occupancy profiles. In social housing context, since energy consumption for heating and cooling is punctual or non-existent, the focus of low energy renovation should be based on passive strategies that reduce the energy demand. The remaining energy needs should be supplied by renewable energy sources, reducing energy poverty, and enhancing quality of life.
Bianca Seabra; Pedro Pereira; Helena Corvacho; Carla Pires; Nuno Ramos. Low Energy Renovation of Social Housing: Recommendations on Monitoring and Renewable Energies Use. Sustainability 2021, 13, 2718 .
AMA StyleBianca Seabra, Pedro Pereira, Helena Corvacho, Carla Pires, Nuno Ramos. Low Energy Renovation of Social Housing: Recommendations on Monitoring and Renewable Energies Use. Sustainability. 2021; 13 (5):2718.
Chicago/Turabian StyleBianca Seabra; Pedro Pereira; Helena Corvacho; Carla Pires; Nuno Ramos. 2021. "Low Energy Renovation of Social Housing: Recommendations on Monitoring and Renewable Energies Use." Sustainability 13, no. 5: 2718.
In this paper, some of the results of an experimental study are presented. Its purpose was to better understand the impact of glazing on thermal comfort of users of indoor spaces (living and working), especially in the areas near glazed walls. Glazed elements, such as windows and glazed doors, allow visual access to the outdoor environment and the entrance of natural light and solar heat gains but they are often the cause of unwanted heat losses and gains and are disturbing elements in obtaining thermal comfort, both in global terms and in what concerns local discomfort due to radiant asymmetries and/or air draughts. Furthermore, solar radiation directly affecting users in the vicinity of glazing can also cause discomfort. These disturbances are recognized by users, both on cold winter days and on hot summer days. To assess thermal comfort or thermal neutrality of a person in a particular indoor space, it is important to know their location within that space. Thus, in order to adequately assess thermal comfort in the areas near the glazing, the indoor thermal environment must be characterized for this specific location. In this study, two indoor spaces (a classroom and an office-room) of a school building were monitored at different periods of the year. The measurements of the environmental parameters were performed both in the center of the rooms and in the areas near the glazing. Five models of thermal comfort assessment were then applied to the results, in order to compare the comfort conditions between the two studied locations and to evaluate the applicability of these models to the areas close to glazed walls. It was observed there was clearly a greater variability of comfort conditions in the vicinity of the glazed walls when compared to the center of the rooms. The application of thermal comfort assessment models to the two studied rooms was able to reveal the differences between the two compared locations within each space. It was also possible to show the effect of incoming solar radiation and the influence of the geometry of the spaces and of the ratio between glazed area and floor area by comparing the results for both spaces. The assessment model proposed by LNEC (Portuguese National Laboratory of Civil Engineering) proved to be the most adapted to Portuguese users’ habits.
António Manuel Figueiredo Freitas Oliveira; Helena Corvacho. Application of thermal comfort assessment models to indoor areas near glazed walls – experimental evaluation. Revista de la construcción 2021, 20, 106 -127.
AMA StyleAntónio Manuel Figueiredo Freitas Oliveira, Helena Corvacho. Application of thermal comfort assessment models to indoor areas near glazed walls – experimental evaluation. Revista de la construcción. 2021; 20 (1):106-127.
Chicago/Turabian StyleAntónio Manuel Figueiredo Freitas Oliveira; Helena Corvacho. 2021. "Application of thermal comfort assessment models to indoor areas near glazed walls – experimental evaluation." Revista de la construcción 20, no. 1: 106-127.
Southern Europe has an old housing stock and has the challenge, as the rest of European Union Member States, to transform it into a decarbonized one, by means of transforming the existing buildings into Nearly Zero Energy Buildings (nZEB). Member States have a large margin of discretion when defining the requirements for nZEB. In this paper, the nZEB requirements for the renovation of residential buildings in Portugal and Spain are studied in detail (unlike the usual more general comparative studies) for a specific building typology with poor energy performance. This is done by checking whether an existing residential building, renovated with different combinations of improvements of the envelope and active systems in two comparable cities in each of these two countries, fulfills the requirements or not, and by comparing the results of CO2 emissions reductions. One of the improvements of the envelope considered are those necessary to fulfill the compulsory major renovation requirements in both countries to check how much we are already approaching to the decarbonization of the residential sector. The results show that nZEB standards applied to the renovation of typical multi-family buildings of 1961–1980 in both countries will significantly contribute to the descarbonization of the building stock for this type of building typology, with reductions of 80–96% of CO2 emissions for Portugal and 71–94% for Spain, if they are applied. However, some aspects of the regulations could possibly be improved such as more restrictive requirements for the current regulations for major renovations in Portugal or the way energy from renewable sources is ensured in Spain, among others.
Marta Monzón-Chavarrías; Belinda López-Mesa; Jaime Resende; Helena Corvacho. The nZEB concept and its requirements for residential buildings renovation in Southern Europe: The case of multi-family buildings from 1961 to 1980 in Portugal and Spain. Journal of Building Engineering 2020, 34, 101918 .
AMA StyleMarta Monzón-Chavarrías, Belinda López-Mesa, Jaime Resende, Helena Corvacho. The nZEB concept and its requirements for residential buildings renovation in Southern Europe: The case of multi-family buildings from 1961 to 1980 in Portugal and Spain. Journal of Building Engineering. 2020; 34 ():101918.
Chicago/Turabian StyleMarta Monzón-Chavarrías; Belinda López-Mesa; Jaime Resende; Helena Corvacho. 2020. "The nZEB concept and its requirements for residential buildings renovation in Southern Europe: The case of multi-family buildings from 1961 to 1980 in Portugal and Spain." Journal of Building Engineering 34, no. : 101918.
A brief analysis on radiant barriers applied in building roofs, included in a wider study, is presented. A case study which involves experimental measurements carried out in a single-family house, located in a mild climate, specifically in the North of Portugal, where radiant barriers were applied and monitored is described. A computer program (CAPSOL) was also used to carry out a sensitivity analysis and to verify if the results pointed to conclusions similar to those of the experimental measurements. In the experimental part of this work, which took place in the summer periods of two consecutive years, two different roofs were monitored in the same house. Values of temperature, relative humidity, solar irradiance, heat fluxes among other parameters were measured. This article presents some of the collected data. In the numerical simulation, the comparison between the situation of the inclusion of a radiant barrier underneath the roof tiles and over the attic floor slab is presented and compared with another situation without this barrier. In general, it was concluded from this brief analysis that the application of a radiant barrier in the roof of a building proves to be advantageous, especially in what regards the attenuation of the maximum temperatures reached at the roof attic, thus mitigating the risk of overheating.
Miguel Ferreira; Helena Corvacho; Ferreira Miguel; Corvacho Helena. The effect of the use of radiant barriers in building roofs on summer comfort conditions – A case study. Energy and Buildings 2018, 176, 163 -178.
AMA StyleMiguel Ferreira, Helena Corvacho, Ferreira Miguel, Corvacho Helena. The effect of the use of radiant barriers in building roofs on summer comfort conditions – A case study. Energy and Buildings. 2018; 176 ():163-178.
Chicago/Turabian StyleMiguel Ferreira; Helena Corvacho; Ferreira Miguel; Corvacho Helena. 2018. "The effect of the use of radiant barriers in building roofs on summer comfort conditions – A case study." Energy and Buildings 176, no. : 163-178.
Building design and its components are the result of a complex process, which should provide pleasant conditions to its inhabitants. Therefore, indoor acceptable comfort is influenced by the architectural design. ISO and ASHRAE standards define thermal comfort as the condition of mind that expresses satisfaction with the thermal environment. The energy demand for heating, beside the building's physical properties, also depend on human behaviour, like opening or closing windows. Generally, windows are the weakest façade element concerning to thermal performance. A lower thermal resistance allows higher thermal conduction through it. When a window is very hot or cold, and the occupant is very close to it, it may result in thermal discomfort. The functionality of a ventilated double window introduces new physical considerations to a traditional window. In consequence, it is necessary to study the local effect on human comfort in function of the boundary conditions. Wind, solar availability, air temperature and therefore heating and indoor air quality conditions will affect the relationship between this passive system and the indoor environment. In the present paper, the influence of thermal performance and ventilation on human comfort resulting from the construction and geometry solutions is shown, helping to choose the best solution. The presented approach shows that in order to save energy it is possible to reduce the air changes of a room to the minimum, without compromising air quality, enhancing simultaneously local thermal performance and comfort. The results of the study on the effect of two parallel windows with a ventilated channel in the same fenestration on comfort conditions for several different room dimensions, are also presented. As the room dimensions' rate changes so does the window to floor rate; therefore, under the same climatic conditions and same construction solution, different results are obtained.
Jorge S. Carlos; Helena Corvacho. Assessing Thermal Comfort Due to a Ventilated Double Window. IOP Conference Series: Materials Science and Engineering 2017, 245, 42004 .
AMA StyleJorge S. Carlos, Helena Corvacho. Assessing Thermal Comfort Due to a Ventilated Double Window. IOP Conference Series: Materials Science and Engineering. 2017; 245 ():42004.
Chicago/Turabian StyleJorge S. Carlos; Helena Corvacho. 2017. "Assessing Thermal Comfort Due to a Ventilated Double Window." IOP Conference Series: Materials Science and Engineering 245, no. : 42004.
The research project carried out aimed to establish guidelines for urban design, especially adjusted to specific climatic conditions and to local design practice. With the aid of a simulation program, Townscope III, several urban scenarios were characterized in what concerns solar access. Some results are presented for the specific case of a block in Espinho. Four different building models were tested. Solar access was evaluated and its repercussion on heating and cooling energy needs of the buildings was estimated. A virtual scenario with an increase of the density of the urban surrounding area was also assessed.
Bruno Marques; Helena Corvacho; Fernando Alves. Assessment of solar access in urban environment: The case of the renewal of a city block in Espinho, Portugal. Indoor and Built Environment 2016, 25, 1075 -1084.
AMA StyleBruno Marques, Helena Corvacho, Fernando Alves. Assessment of solar access in urban environment: The case of the renewal of a city block in Espinho, Portugal. Indoor and Built Environment. 2016; 25 (7):1075-1084.
Chicago/Turabian StyleBruno Marques; Helena Corvacho; Fernando Alves. 2016. "Assessment of solar access in urban environment: The case of the renewal of a city block in Espinho, Portugal." Indoor and Built Environment 25, no. 7: 1075-1084.
The transformation of European existing building stock towards very low energy buildings requires a new approach. In this context, it seems reasonable to think that buildings should no longer be renovated individually but as part of a global energy system. Focusing on larger urban units may present some scale advantages and may constitute an opportunity to change the urban environment in a smart energy way. Specificities of Southern European countries are addressed. Due either to the climate or the life style, there are large differences in energy consumption per dwelling among southern and northern European countries. How much heating energy will be saved by over-insulating building envelopes if people do not feel the need to heat their houses in the first place? In addition, real energy use in buildings frequently shows major differences with respect to the predicted consumption. The definition of realistic solutions demands the availability of realistic predictions. A case of a residential complex in Portugal is used to illustrate the main questions and to conclude that moving from a building to a group of buildings scale may be an interesting challenge for policy makers to look closer in the near future.
Helena Corvacho; Fernando Brandão Alves; Cecília Rocha. A Reflection on Low Energy Renovation of Residential Complexes in Southern Europe. Sustainability 2016, 8, 987 .
AMA StyleHelena Corvacho, Fernando Brandão Alves, Cecília Rocha. A Reflection on Low Energy Renovation of Residential Complexes in Southern Europe. Sustainability. 2016; 8 (10):987.
Chicago/Turabian StyleHelena Corvacho; Fernando Brandão Alves; Cecília Rocha. 2016. "A Reflection on Low Energy Renovation of Residential Complexes in Southern Europe." Sustainability 8, no. 10: 987.
This article discusses the retrofitting of public spaces in compact urban areas bearing in mind the need for outdoor thermal comfort. The role of paving materials and vegetation was focused on a field survey undertaken at a square in Porto, Portugal. The potential for microclimatic improvement of different combinations of paving materials and vegetation was explored through simulations with ENVI-met. The options, objectives and results of the simulations and an evaluation of Life Cycle Assessment related factors were addressed and discussed. The best improvement scenario was defined stressing the relevance of ‘cool’ paving materials and vegetation and the need for a sustainability analysis throughout the design practice.
J. Cortesão; Fernando Alves; H. Corvacho; Cecilia Rocha. Retrofitting public spaces for thermal comfort and sustainability. Indoor and Built Environment 2016, 25, 1085 -1095.
AMA StyleJ. Cortesão, Fernando Alves, H. Corvacho, Cecilia Rocha. Retrofitting public spaces for thermal comfort and sustainability. Indoor and Built Environment. 2016; 25 (7):1085-1095.
Chicago/Turabian StyleJ. Cortesão; Fernando Alves; H. Corvacho; Cecilia Rocha. 2016. "Retrofitting public spaces for thermal comfort and sustainability." Indoor and Built Environment 25, no. 7: 1085-1095.
An efficient adhesive bonding of exterior ceramic tiles applied on façades is an obvious important factor to ensure the safety and the durability of the façade. The failure of adhesive bonding is a common issue with relevant technical and economic consequences.The aim of this work is to present an evaluation of the performance overtime of adhesives systems in bonded ceramic tiles on façades, based on extensive experimental research works carried out at the Laboratory of Building Physics (LFC).A detailed case study is presented which evaluate the performance of adhesives systems to be used on the façades of a building located near the sea. For this purpose, accelerated ageing tests are performed following two different ageing procedures, allowing the comparison of the performance over time of the systems under analysis).
V.P. De Freitas; H. Corvacho; M. Quintela; J.M.P.Q. Delgado. Performance over Time of Adhesive Systems for Bonding Ceramic Tiles – A Detailed Case Study. Diffusion Foundations 2015, 3, 183 -193.
AMA StyleV.P. De Freitas, H. Corvacho, M. Quintela, J.M.P.Q. Delgado. Performance over Time of Adhesive Systems for Bonding Ceramic Tiles – A Detailed Case Study. Diffusion Foundations. 2015; 3 ():183-193.
Chicago/Turabian StyleV.P. De Freitas; H. Corvacho; M. Quintela; J.M.P.Q. Delgado. 2015. "Performance over Time of Adhesive Systems for Bonding Ceramic Tiles – A Detailed Case Study." Diffusion Foundations 3, no. : 183-193.
Jorge Carlos; Helena Corvacho. Evaluation of the performance indices of a ventilated double window through experimental and analytical procedures: SHGC-values. Energy and Buildings 2015, 86, 886 -897.
AMA StyleJorge Carlos, Helena Corvacho. Evaluation of the performance indices of a ventilated double window through experimental and analytical procedures: SHGC-values. Energy and Buildings. 2015; 86 ():886-897.
Chicago/Turabian StyleJorge Carlos; Helena Corvacho. 2015. "Evaluation of the performance indices of a ventilated double window through experimental and analytical procedures: SHGC-values." Energy and Buildings 86, no. : 886-897.
Vasco P. de Freitas; Helena Corvacho; M. Quintela; J.M.P.Q. Delgado. Assessing the durability of mortars tiles – A contribution for a prediction model. Engineering Failure Analysis 2014, 44, 36 -45.
AMA StyleVasco P. de Freitas, Helena Corvacho, M. Quintela, J.M.P.Q. Delgado. Assessing the durability of mortars tiles – A contribution for a prediction model. Engineering Failure Analysis. 2014; 44 ():36-45.
Chicago/Turabian StyleVasco P. de Freitas; Helena Corvacho; M. Quintela; J.M.P.Q. Delgado. 2014. "Assessing the durability of mortars tiles – A contribution for a prediction model." Engineering Failure Analysis 44, no. : 36-45.
This paper presents a study of the potential for the use of natural ventilation systems in Portuguese multi-family residential buildings under winter climatic conditions. The behaviour of various natural ventilation systems is tested in a standard residential dwelling, using the TRNSYS 15 and COMIS 3.1 software programs. This study leads to the conclusion that the use of hybrid ventilation systems can save a considerable amount of the energy normally spent on continuously operating mechanical ventilation systems. Hybrid ventilation systems will not be adequate if there are no ventilation inlets in the façade and air intake is only by means of infiltration, especially in the case of certain modern windows with better seals; in such situations, the use of continuous mechanical ventilation systems is recommended. Therefore, it is essential to equip buildings with air inlets in the façades, preferably self-adjustable grilles, to ensure the best use of hybrid systems.
M. Ferreira; Helena Corvacho. Natural Ventilation Potential in Portuguese Residential Buildings under Winter Conditions – An Opportunity for Hybrid Ventilation. International Journal of Ventilation 2014, 13, 77 -88.
AMA StyleM. Ferreira, Helena Corvacho. Natural Ventilation Potential in Portuguese Residential Buildings under Winter Conditions – An Opportunity for Hybrid Ventilation. International Journal of Ventilation. 2014; 13 (1):77-88.
Chicago/Turabian StyleM. Ferreira; Helena Corvacho. 2014. "Natural Ventilation Potential in Portuguese Residential Buildings under Winter Conditions – An Opportunity for Hybrid Ventilation." International Journal of Ventilation 13, no. 1: 77-88.
Simulations to evaluate energy demand for heating and cooling and thermal comfort are becoming more and more common place in the building design process, at least in the most complex cases. In all detailed or simplified calculations, to analyse heat transfer to and from a building, several input parameters are needed. The inputs for the simulation of a whole building are at least the building geometry, the building envelope thermal indices (like thermal transmittance or the solar heat gain coefficient) and typical local climatic data. In a ventilated double window, the air flow through the channel between the two windows makes its thermal performance highly dynamic and dependent on the air flow characteristics. For a whole building simulation, single coefficients or easily calculated coefficients are needed for each facade system, including ventilated systems. In this paper, equivalent thermal transmittance coefficients for a ventilated double window are assessed and presented. For that, experimental measurements in the absence of solar radiation (night period) were used to identify tendencies and validate calculations. Furthermore, simulations were done in order to estimate the Uw-values of the ventilated double window under different windows configuration and different air flow rates. These values can then be used in whole building simulation programmes.
Jorge S. Carlos; Helena Corvacho. Evaluation of the thermal performance indices of a ventilated double window through experimental and analytical procedures: Uw-values. Renewable Energy 2013, 63, 747 -754.
AMA StyleJorge S. Carlos, Helena Corvacho. Evaluation of the thermal performance indices of a ventilated double window through experimental and analytical procedures: Uw-values. Renewable Energy. 2013; 63 ():747-754.
Chicago/Turabian StyleJorge S. Carlos; Helena Corvacho. 2013. "Evaluation of the thermal performance indices of a ventilated double window through experimental and analytical procedures: Uw-values." Renewable Energy 63, no. : 747-754.
The aim of this work is to give a contribution for the assessment of the durability of adhesive systems for bonding ceramic tiles on façades, based on experimental works carried out at the Building Physics Laboratory, Faculty of Engineering, University of Porto, Portugal (LFC—FEUP), in the perspective of both the research and the possible practical applications. The durability assessment of any construction material is not an easy task. The researchers must choose between several different approaches, each of which has advantages and limitations. While, in a building in use, the materials or components are subjected to varying actions in an environment where the great majority of the degradation agents are not controllable by man, in a laboratory, one can choose to expose the materials to artificial and controlled conditions, using climatic chambers for accelerated ageing. The main difficulty of this type of test lies in the interpretation of the results, in what concerns their correspondence to real time. Researchers on durability have been discussing this problem for a long time: how to get a valuable correlation between the results of accelerated ageing tests and the one issued from natural exposure. This work is presented in two different stages. In a first stage, a discussion on durability assessment is presented based on an experimental research study, concerning the performance over time of different types of cementitious adhesives exposed to accelerated ageing tests and also to natural ageing. The main advances and the main difficulties in implementing a service life prediction model are identified. Suitable strategies are discussed for the future development of this approach. In a second stage, an extensive case study is presented. The main goal of this case study is to evaluate the durability of alternative adhesive systems for bonding ceramic tiles on the façades of a building, located near the sea. For this purpose, accelerated ageing tests are performed following two different ageing procedures, allowing the comparison of the performance over time of the systems under analysis.
Vasco Peixoto De Freitas; Helena Corvacho; Marisa Quintela; J. M. P. Q. Delgado. Durability Assessment of Adhesive Systems for Bonding Ceramic Tiles on Façades: The Research and the Practice. Case Studies of Building Pathology in Cultural Heritage 2013, 3, 173 -205.
AMA StyleVasco Peixoto De Freitas, Helena Corvacho, Marisa Quintela, J. M. P. Q. Delgado. Durability Assessment of Adhesive Systems for Bonding Ceramic Tiles on Façades: The Research and the Practice. Case Studies of Building Pathology in Cultural Heritage. 2013; 3 ():173-205.
Chicago/Turabian StyleVasco Peixoto De Freitas; Helena Corvacho; Marisa Quintela; J. M. P. Q. Delgado. 2013. "Durability Assessment of Adhesive Systems for Bonding Ceramic Tiles on Façades: The Research and the Practice." Case Studies of Building Pathology in Cultural Heritage 3, no. : 173-205.
Keeping the indoor air quality within the reference levels requires that the polluted indoor air be replaced by fresh air coming from the outside. This paper presents a sensitivity analysis and a series of simulations where the performance of this passive system is studied. The influence of each relevant factor, like the wind, the solar radiation, and the outdoor air temperature, is assessed. Two different local sets of climatic data were chosen, a mild and a cold winter.
Jorge S. Carlos; Helena Corvacho. Ventilated Double Window for the Preheating of the Ventilation Air Comparison of Its Performance in a Northern and a Southern European Climate. Journal of Renewable Energy 2013, 2013, 1 -11.
AMA StyleJorge S. Carlos, Helena Corvacho. Ventilated Double Window for the Preheating of the Ventilation Air Comparison of Its Performance in a Northern and a Southern European Climate. Journal of Renewable Energy. 2013; 2013 ():1-11.
Chicago/Turabian StyleJorge S. Carlos; Helena Corvacho. 2013. "Ventilated Double Window for the Preheating of the Ventilation Air Comparison of Its Performance in a Northern and a Southern European Climate." Journal of Renewable Energy 2013, no. : 1-11.
The ventilated double window, as a passive heating system, acts as a heat reclaiming device. Part of the heat loss from inside through the window is returned back to the room by the air flow, acting as a heat recoverer. Incident solar radiation upon the window warms its components being part of that heat removed by the air flow delivering it into the room, acting as a solar collector. The effect of these two functions were analysed in this study, through numerical simulation based on outdoor tests under real weather conditions. It was found that solar collector function plays a small role in the pre-heating of the air. First of all this is due to the system’s transparency, which allows most of the solar radiation to enter directly to the indoor space. Secondly, in a 24 h period there are only some hours of sunshine. Instead, heat recovery works all the time, the conclusion being that this passive heating device can be used on any facade orientation.
Jorge S. Carlos; Helena Corvacho; Pedro Silva; João Castro-Gomes. Heat recovery versus solar collection in a ventilated double window. Applied Thermal Engineering 2012, 37, 258 -266.
AMA StyleJorge S. Carlos, Helena Corvacho, Pedro Silva, João Castro-Gomes. Heat recovery versus solar collection in a ventilated double window. Applied Thermal Engineering. 2012; 37 ():258-266.
Chicago/Turabian StyleJorge S. Carlos; Helena Corvacho; Pedro Silva; João Castro-Gomes. 2012. "Heat recovery versus solar collection in a ventilated double window." Applied Thermal Engineering 37, no. : 258-266.
M. Isabel Abreu; Helena Corvacho; Ricardo P. Dias. Passive Systems for Buildings Using Buoyancy-Driven Airflows. Recent Patents on Engineering 2011, 5, 23 -31.
AMA StyleM. Isabel Abreu, Helena Corvacho, Ricardo P. Dias. Passive Systems for Buildings Using Buoyancy-Driven Airflows. Recent Patents on Engineering. 2011; 5 (1):23-31.
Chicago/Turabian StyleM. Isabel Abreu; Helena Corvacho; Ricardo P. Dias. 2011. "Passive Systems for Buildings Using Buoyancy-Driven Airflows." Recent Patents on Engineering 5, no. 1: 23-31.
Jorge Carlos; Helena Corvacho; Pedro Silva; João Castro-Gomes. Modelling and simulation of a ventilated double window. Applied Thermal Engineering 2011, 31, 93 -102.
AMA StyleJorge Carlos, Helena Corvacho, Pedro Silva, João Castro-Gomes. Modelling and simulation of a ventilated double window. Applied Thermal Engineering. 2011; 31 (1):93-102.
Chicago/Turabian StyleJorge Carlos; Helena Corvacho; Pedro Silva; João Castro-Gomes. 2011. "Modelling and simulation of a ventilated double window." Applied Thermal Engineering 31, no. 1: 93-102.