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Mtr Jayasinghe - One of the best experts on this subject based on the ideXlab platform.

  • influence of Insulated Roof slabs on air conditioned spaces in tropical climatic conditions a life cycle cost approach
    Energy and Buildings, 2009
    Co-Authors: R U Halwatura, Mtr Jayasinghe
    Abstract:

    The recent energy crisis and the environment impacts of building industry have led to the active promotion of principles of sustainable development in recent times. Minimization of energy usage is the key to improve sustainability where the actual impact is assessed on the basis of life cycle cost estimates. In this context, the performance of Insulated Roof slabs which can be used as an alternative to conventional light weight Roofs, have been assessed in detail especially with respect to air conditioned buildings. It is shown that Insulated Roof slabs could have a desirable behaviour with respect to life cycle performance in addition to providing other benefits such as cyclone resistance and higher robustness to the building.

  • Influence of Insulated Roof slabs on air conditioned spaces in tropical climatic conditions—A life cycle cost approach
    Energy and Buildings, 2009
    Co-Authors: R U Halwatura, Mtr Jayasinghe
    Abstract:

    The recent energy crisis and the environment impacts of building industry have led to the active promotion of principles of sustainable development in recent times. Minimization of energy usage is the key to improve sustainability where the actual impact is assessed on the basis of life cycle cost estimates. In this context, the performance of Insulated Roof slabs which can be used as an alternative to conventional light weight Roofs, have been assessed in detail especially with respect to air conditioned buildings. It is shown that Insulated Roof slabs could have a desirable behaviour with respect to life cycle performance in addition to providing other benefits such as cyclone resistance and higher robustness to the building.

  • Thermal performance of Insulated Roof slabs in tropical climates
    Energy and Buildings, 2008
    Co-Authors: R U Halwatura, Mtr Jayasinghe
    Abstract:

    Reinforced concrete Roof slabs can be an ideal alternative to traditional Roofs considering the better cyclone resistance that can be offered due to the self weight. However, the concrete slabs do not perform satisfactorily in warm humid tropical climatic conditions and tend to act as heated bodies for the occupants in free running spaces. As a solution, a robust Roof slab insulation system is proposed and its thermal performance was determined experimentally using small and large-scale models. With comfort models developed for the people acclimatized to tropical climatic conditions, it is shown that Insulated Roof slabs could provide acceptable indoor conditions while providing many valuable benefits such as cyclone resistance, regaining of land lost for the house and the possibility of creation of Roof top gardens.

  • Strategies for improved micro-climates in high-density residential developments in tropical climates
    Energy for Sustainable Development, 2007
    Co-Authors: R U Halwatura, Mtr Jayasinghe
    Abstract:

    High-density residential developments on outskirts of cities with a large number of detached multistorey houses on small blocks of land are actively promoted as a solution to urban migration in many countries. Such a concentration of houses can have adverse effects on the micro-climate due to the presence of a large number of Roofs which have a tendency to warm the surrounding air, leading to heat island effects. The use of Insulated Roof slabs provides an alternative that may enable the creation of green cover at Roof level. In this research, the performance of different insulation thicknesses has been evaluated, indicating that a minimum thickness of 25 mm would be desirable in tropical climatic conditions. The effect of creating green cover was determined with actual models. It is proved with comparative studies that shading screens can be used to simulate the presence of green cover with computer simulations. This is important in predicting the performance of Insulated Roof slabs for buildings of different layouts.

R U Halwatura - One of the best experts on this subject based on the ideXlab platform.

  • influence of Insulated Roof slabs on air conditioned spaces in tropical climatic conditions a life cycle cost approach
    Energy and Buildings, 2009
    Co-Authors: R U Halwatura, Mtr Jayasinghe
    Abstract:

    The recent energy crisis and the environment impacts of building industry have led to the active promotion of principles of sustainable development in recent times. Minimization of energy usage is the key to improve sustainability where the actual impact is assessed on the basis of life cycle cost estimates. In this context, the performance of Insulated Roof slabs which can be used as an alternative to conventional light weight Roofs, have been assessed in detail especially with respect to air conditioned buildings. It is shown that Insulated Roof slabs could have a desirable behaviour with respect to life cycle performance in addition to providing other benefits such as cyclone resistance and higher robustness to the building.

  • Influence of Insulated Roof slabs on air conditioned spaces in tropical climatic conditions—A life cycle cost approach
    Energy and Buildings, 2009
    Co-Authors: R U Halwatura, Mtr Jayasinghe
    Abstract:

    The recent energy crisis and the environment impacts of building industry have led to the active promotion of principles of sustainable development in recent times. Minimization of energy usage is the key to improve sustainability where the actual impact is assessed on the basis of life cycle cost estimates. In this context, the performance of Insulated Roof slabs which can be used as an alternative to conventional light weight Roofs, have been assessed in detail especially with respect to air conditioned buildings. It is shown that Insulated Roof slabs could have a desirable behaviour with respect to life cycle performance in addition to providing other benefits such as cyclone resistance and higher robustness to the building.

  • Thermal performance of Insulated Roof slabs in tropical climates
    Energy and Buildings, 2008
    Co-Authors: R U Halwatura, Mtr Jayasinghe
    Abstract:

    Reinforced concrete Roof slabs can be an ideal alternative to traditional Roofs considering the better cyclone resistance that can be offered due to the self weight. However, the concrete slabs do not perform satisfactorily in warm humid tropical climatic conditions and tend to act as heated bodies for the occupants in free running spaces. As a solution, a robust Roof slab insulation system is proposed and its thermal performance was determined experimentally using small and large-scale models. With comfort models developed for the people acclimatized to tropical climatic conditions, it is shown that Insulated Roof slabs could provide acceptable indoor conditions while providing many valuable benefits such as cyclone resistance, regaining of land lost for the house and the possibility of creation of Roof top gardens.

  • Strategies for improved micro-climates in high-density residential developments in tropical climates
    Energy for Sustainable Development, 2007
    Co-Authors: R U Halwatura, Mtr Jayasinghe
    Abstract:

    High-density residential developments on outskirts of cities with a large number of detached multistorey houses on small blocks of land are actively promoted as a solution to urban migration in many countries. Such a concentration of houses can have adverse effects on the micro-climate due to the presence of a large number of Roofs which have a tendency to warm the surrounding air, leading to heat island effects. The use of Insulated Roof slabs provides an alternative that may enable the creation of green cover at Roof level. In this research, the performance of different insulation thicknesses has been evaluated, indicating that a minimum thickness of 25 mm would be desirable in tropical climatic conditions. The effect of creating green cover was determined with actual models. It is proved with comparative studies that shading screens can be used to simulate the presence of green cover with computer simulations. This is important in predicting the performance of Insulated Roof slabs for buildings of different layouts.

Ge Courville - One of the best experts on this subject based on the ideXlab platform.

  • A comparison of two independent techniques for the determination of in situ Thermal performance. Discussion
    ASTM special technical publications, 1990
    Co-Authors: Ge Courville, A. O. Desjarlais, R. P. Tye, C. R. Mcintyre, J. R. Hagan
    Abstract:

    A parallel experiment has been performed on an Insulated Roof system installed in the Roof Thermal Research Apparatus at Oak Ridge National Laboratory. Separate sections of a 1.2 by 2.4 m test panel were evaluated for nine months using two different heat flux transducer (HFT) instrumentation packages, with the data being treated independently. The paper discusses the instrumentation packages, sensor calibration procedures, and data collection and analyses methods, highlighting the differences between the independent techniques. A comparison of the independently derived thermal performance results is presented. The comparison includes a discussion of the HFT test techniques for determining the in situ thermal performance of Insulated building components. Limitations of these procedures are also detailed.

  • An Apparatus for Thermal Performance Measurements of Insulated Roof Systems
    Thermal Insulation: Materials and Systems, 1
    Co-Authors: Ge Courville, Kw Childs, Dj Walukas, Phillip W Childs, Ei Griggs
    Abstract:

    The US Department of Energy conducted thermal performance measurements on low-slope Roofs with a recently developed field test apparatus at Oak Ridge National Laboratory (ORNL). The apparatus accommodates four 4 ft x 8 ft test specimens and includes the measurement capabilities for specimen temperatures, temperature gradients, heat flows and moisture content. A weather station characterizes outdoor weather conditions. Tests underway include (1) validation of a Roof surface temperature model developed to study the effects of wet insulation; (2) measurement of temperature distributions and heat transfer in high R-value Roofs; and (3) validation of an analysis of the effectiveness of high reflectance surfaces. Preliminary experimental results are presented and correlations between experiment and modeling are discussed.

  • A comparison of two independent techniques for the determination of in-situ thermal performance
    Insulation Materials Testing and Applications, 1
    Co-Authors: Ge Courville, A. O. Desjarlais, R. P. Tye, C. R. Mcintyre
    Abstract:

    A parallel experiment has been performed on an Insulated Roof system installed in the Roof Thermal Research Apparatus (RTRA) at Oak Ridge National Laboratory (ORNL). Separate sections of a 4 foot, by 8 foot test panel were evaluated for over 12 months using two different heat flux transducer (HFT) instrumentation packages with the data being treated independently. The paper discusses the instrumentation packages, sensor calibration procedures, and data collection and analysis methods highlighting the differences between the independent techniques. A comparison of the independently derived thermal performance results is presented. The comparison includes a discussion of these types of HFT test techniques for determining the in-situ thermal performance of Insulated building components. Limitations of these procedures are also detailed.

  • Electric Field Probes for Quantitative Moisture Measurements in Building Materials
    Water Vapor Transmission Through Building Materials and Systems: Mechanisms and Measurement, 1
    Co-Authors: Ge Courville, Jo Hylton, Wp Murray, A Blalock, Cj Remenyik
    Abstract:

    Three novel capacitance techniques for making moisture measurements in Insulated Roof systems are being studied at the Oak Ridge National Laboratory (ORNL). These are designated as the ''Pin Probe,'' the ''Thermocouple Probe,'' and the ''Planar Probe.'' The Pin Probe, developed at the Massachusetts Institute of Technology (MIT), consists of two parallel lines of straight pins as the two probe electrodes. This is an intrusive probe that must be mounted within the system being tested. The Thermocouple Probe is also intrusive. Its use assumes that thermocouple junctions exist at known locations in the specimen for temperature measurements. The probe electronics allows high frequency capacitance measurements between thermocouples without interfering with their temperature measurement function. The third probe, the Planar Probe, is non-intrusive and consists of a series of equally spaced plate electrodes in a box that sits on the surface of the Roof. These electrodes provide several independent electrical signals from overlapping depths within the Roof system. An analysis procedure was developed to identify the electrical properties of successively deeper layers of material. Prototypes of each of these probes have been constructed and promising preliminary data are available. Probe calibration, circuit stability, and range of applicability are major outstanding issues thatmore » must still be addressed. 6 refs., 12 figs., 4 tabs.« less

Eduardo González - One of the best experts on this subject based on the ideXlab platform.

  • Experimental and numerical evaluation of a solar passive cooling system under hot and humid climatic conditions
    Solar Energy, 2001
    Co-Authors: José Rincón, Nastia Almao, Eduardo González
    Abstract:

    Abstract The thermal performance of a solar passive cooling system (SPCS) under a hot and humid climate is experimentally and numerically evaluated. The experimental data were obtained from two full scale cells, with identical walls, but different Roof configurations. One cell has a highly-Insulated Roof and the other has an SPCS incorporated consisting of a thermal mass (water), which is cooled by evaporation and long wave nocturnal radiation. The study was conducted taking into account the local climatic conditions of Maracaibo, a topical city located in Venezuela. The numerical evaluation was accomplished using the computational code ‘EVITA’ which is based on the finite volume approach with high order bounded treatment of the convective terms. A PISO-like solution algorithm is used to solve the transient form of the continuity, momentum and energy equations. It has been demonstrated experimentally and numerically that under a hot and humid climate, it is possible to keep the indoor temperature below the outdoor temperature, using a passive cooling technique of a Roof pond. The numerical results obtained using the model have demonstrated that the computational code used is a suitable cost-efficient alternative for the thermal performance evaluation of SPCS.

Carine Henriot - One of the best experts on this subject based on the ideXlab platform.

  • AERIAL THERMOGRAPHY AS A DIAGNOSTIC TOOL FOR RESIDENTIAL BUILDING STOCK ENERGY ASSESSMENT, WITHIN A LOCAL ENERGY POLICY PERSPECTIVE
    2017
    Co-Authors: Nathalie Molines, Carine Henriot
    Abstract:

    According to the French Environment and Energy Management Agency (ADEME), a poorly Insulated Roof can be the cause of 25 to 30% of heat loss from a building. Given that a municipality's real estate consists mainly of old buildings, a comprehensive approach is essential to improve Roof thermal efficiency. In this context, the Urban Region of Compiègne (URC), in partnership with ADEME, has implemented an extensive public awareness campaign on building insulation, targeted at local residents and elected officials. Among other initiatives, the campaign conducted an aerial thermographic survey of the entire URC. The urban region of Compiègne organized a Thermography conference to help residents interpret data about their own residence and to inform them about relevant financial aid and other programs. To extend the study beyond an analysis of individual buildings, the URC asked the Department of Urban Systems Engineering of the University of Technology of Compiègne to perform additional studies. This article presents the work we did for building stock. The scope of the study was to propose a tool to conduct a comprehensive diagnostic of the territory of Compiègne and identify areas of particular interest. One point in particular will be discussed in this article: the creation of a set of indicators to refine the analysis relativizing heat loss through the Roof and to identify priority intervention areas. MOLINES Nathalie, HENRIOT Carine 2

  • AERIAL THERMOGRAPHY AS A DIAGNOSTIC TOOL FOR RESIDENTIAL BUILDING STOCK ENERGY ASSESSMENT, WITHIN A LOCAL ENERGY POLICY PERSPECTIVE
    2017
    Co-Authors: Nathalie Molines, Carine Henriot
    Abstract:

    According to the French Environment and Energy Management Agency (ADEME), a poorly Insulated Roof can be the cause of 25 to 30% of heat loss from a building. Given that a municipality's real estate consists mainly of old buildings, a comprehensive approach is essential to improve Roof thermal efficiency. In this context, the Urban Region of Compiegne (URC), in partnership with ADEME, has implemented an extensive public awareness campaign on building insulation, targeted at local residents and elected officials. Among other initiatives, the campaign conducted an aerial thermographic survey of the entire URC. The urban region of Compiegne organized a Thermography conference to help residents interpret data about their own residence and to inform them about relevant financial aid and other programs. To extend the study beyond an analysis of individual buildings, the URC asked the Department of Urban Systems Engineering of the University of Technology of Compiegne to perform additional studies. This article presents the work we did for building stock. The scope of the study was to propose a tool to conduct a comprehensive diagnostic of the territory of Compiegne and identify areas of particular interest. One point in particular will be discussed in this article: the creation of a set of indicators to refine the analysis relativizing heat loss through the Roof and to identify priority intervention areas. MOLINES Nathalie, HENRIOT Carine 2