Energy performance of five different building envelope structures using a modified Guarded Hot Box apparatus—Comparative analysis

Trgala, Kamil; Pavelek, Miloš; Wimmer, Rupert

doi:10.1016/j.enbuild.2019.04.036

Cited by 20 publications

(14 citation statements)

References 25 publications

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“…The mathematical models, calculations, and the testing of thermal properties of a material are required to correctly calculate the thermal transfer value through the building envelope. To evaluate the thermal performance of the material, the hot box, which consists of highand low-temperature chambers divided by the envelope material is used; it accurately determines the thermal transmittance under both steady-state and dynamic conditions [9]. The opaque material used to construct walls and roofs has many different thermal properties depending on composition [10].…”

Section: Literature Reviewmentioning

confidence: 99%

Energy and Economic Analysis of Tropical Building Envelope Material in Compliance with Thailand’s Building Energy Code

Chiradeja

Ngaopitakkul

2019

Sustainability

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The building envelope has a direct impact on the overall energy consumption of a building. Thus, an improvement in the building envelope using energy-efficient material can yield the desired energy performance. This study is based on the materials and compositions used in building envelopes in compliance with the building energy code of Thailand. The building under study is an educational building located in Bangkok, Thailand. Both the energy and the economic aspects of retrofitted building envelopes are discussed in this study. The energy performance was evaluated by calculating the thermal transfer value and whole building energy consumption using the building energy code (BEC) software. The simulation was done under the assumption that the building envelope in the case study building was retrofitted with different materials and compositions. The study determines the feasibility of retrofitting buildings using energy-efficient material by utilizing the discounted payback period and internal rate of return (IRR) as indicators. The results show that retrofitted building envelopes in every case can reduce the whole building energy consumption. In the best envelope configuration, energy consumption can decrease by 65%. In addition, the economic potential is also high, with an IRR value of approximately 15% and a payback period of 23 less than nine years. These finding indicate that a building envelope made with energy-efficient material can achieve good results for both energy performance and economic feasibility.

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Section: Literature Reviewmentioning

confidence: 99%

Energy and Economic Analysis of Tropical Building Envelope Material in Compliance with Thailand’s Building Energy Code

Chiradeja

Ngaopitakkul

2019

Sustainability

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“…The increasing demand for energy-efficient buildingsspecifically wooden houses -during the past decade has caused a higher standard of the thermal insulation of building envelopes. Buildings are responsible for 40 % of the energy consumption in the EU [1]. At present, there is no binding uniform methodology for the diagnostics of the wooden house sandwich structure system.…”

Section: Introductionmentioning

confidence: 99%

A measurement system for the long-term diagnostics of the thermal and technical properties of wooden houses

2020

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To reduce construction costs and to increase energy savings and indoor environmental quality in a wooden house, an energy consumption measuring system for the diagnostics of the thermal and technical properties of building envelopes has been developed. At present, the vast majority of calculations for the thermal and technical characteristics of buildings are based on simple mathematical models of building envelope behavior, and these are derived primarily from the thermal transmission of individual materials. However, thermal transmission is measured in a stable laboratory environment. Therefore, the measured values may not match the real behavior of materials in continually changing climatic conditions. The energy consumption measuring system was installed in seven wooden houses in different climatic areas to diagnose the thermal and technical properties of a building envelope. The power consumption, temperature, and humidity of the air as well as of the wood; CO2 concentration; the temperature of the individual layers of the envelope sandwich structure; and wind speed and direction were measured. Thanks to the sets of real measurements of the measured thermal and technical behavior, the actual dependence of the indoor environment quality on the outdoor climatic conditions can be ascertained. The presented system can reveal imperfections in the heat capacity and hygroscopicity of materials used for the construction of a wooden house. Based on this measurement, the materials can be revised to save construction costs and energy; to increase the indoor environment quality; and to reduce the impact on the environment by decreasing the amount of used materials.

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“…Indeed, if the hot box equipment is not adequate or the number of temperature probes is not sufficient, a partial knowledge of thermal phenomena and not suitable thermal conditions inside the chambers are obtained. Some authors claim that, given the state of the art, climate chambers can be precisely controlled and programmed with temperature cycles [8]. Being missing an analysis of the measuring and control systems commonly employed in hot box experiments, a literature insight on such systems is presented in the following (Section 2), highlighting the frequent employment of commercial (and sometimes expensive) devices.…”

Section: Introductionmentioning

confidence: 99%

Integrated Measuring and Control System for Thermal Analysis of Buildings Components in Hot Box Experiments

et al. 2019

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In this paper, a novel integrated measuring and control system for hot box experiments is presented. The system, based on a general-purpose microcontroller and on a wireless sensors network, is able to fully control the thermal phenomena inside the chambers, as well as the heat flux that involves the specimen wall. Thanks to the continuous measurements of air and surfaces temperatures and energy input into the hot chamber, the thermal behavior of each hot box component is analyzed. A specific algorithm allows the post-process of the measured data for evaluating the specimen wall thermal quantities and for creating 2D and 3D thermal models of each component. The system reliability is tested on a real case represented by a double insulating X-lam wall. The results of the 72 h experiment show the system’s capability to maintain stable temperature set points inside the chambers and to log the temperatures measured by the 135 probes, allowing to know both the U-value of the sample (equal to 0.216 ± 0.01 W/m2K) and the thermal models of all the hot box components. The U-value obtained via hot box method has been compared with the values gathered through theoretical calculation and heat flow meter measurements, showing differences of less than 20%. Finally, thanks to the data postprocessing, the 2D and 3D thermal models of the specimen wall and of the chambers have been recreated.

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Energy performance of five different building envelope structures using a modified Guarded Hot Box apparatus—Comparative analysis

Cited by 20 publications

References 25 publications

Energy and Economic Analysis of Tropical Building Envelope Material in Compliance with Thailand’s Building Energy Code

Energy and Economic Analysis of Tropical Building Envelope Material in Compliance with Thailand’s Building Energy Code

A measurement system for the long-term diagnostics of the thermal and technical properties of wooden houses

Integrated Measuring and Control System for Thermal Analysis of Buildings Components in Hot Box Experiments

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