U-value in situ measurement for energy diagnosis of existing buildings

Ficco, Giorgio; Iannetta, Fabio; Ianniello, Elvira; Alfano, Francesca Romana d’Ambrosio; Dell’Isola, Marco

doi:10.1016/j.enbuild.2015.06.071

Cited by 185 publications

(153 citation statements)

References 13 publications

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“…In addition, a real time clock, the low power DS1307 module provided by Maxim Integrated, has been included in the system and connected through an I2C protocol, in order to track the measurement time. Two experimental tests in quasi steady-state conditions have been carried out, having 200 min of duration each and with the acquisition time-step of the temperature values equal to 10 min, that is a traditional value in long-term measurements [11]. The acquisition time-step is in agreement with the maximum acquisition rate allowed by the designed system.…”

Section: The Proposed Systemmentioning

confidence: 55%

Digital Multi-Probe Temperature Monitoring System for Long-Term on Field Measurements

Pantoli

Muttillo

Rubeis

et al. 2017

Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017

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Abstract:In this work, we present a flexible and multi-probe temperature measurement system, suitable for real time monitoring and long-term applications. The proposed sensor system allows to investigate the thermal performance of different environments such as building areas, walls or external places. The equipment has been characterized both at device and system levels and validated through experimental tests through a comparison with different sensors. The conceived system consists of a control unit with a microcontroller, a user interface and an internal recording section for data storage and management, and digital temperature sensors with a 12-bit resolution, whose number can be freely defined, having the system a modular architecture. The low-cost and open-source characteristics, beyond of its flexibility and capability to manage several sensors placed also very far from the control unit (up to 500 m), make the proposed solution a suitable candidate to be used for practical applications that require on-field measurements.

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Section: The Proposed Systemmentioning

confidence: 55%

Digital Multi-Probe Temperature Monitoring System for Long-Term on Field Measurements

Pantoli

Muttillo

Rubeis

et al. 2017

Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017

View full text Add to dashboard Cite

show abstract

“…In this paper method B has been used. All the tests have been performed under the following main conditions: (i) wind speed below 3 m s −1 ; (ii) product of building height by indoor-outdoor air temperature difference lower than 500 m K; (iii) total volume of the building below 4000 m 3 .…”

Section: Methodsmentioning

confidence: 99%

“…Unfortunately, the retrofit of opaque elements is often difficult, especially when buildings exhibit historical constraints (e.g., in Mediterranean countries) or aesthetic peculiarities that avoid invasive solutions such as external insulation. On the other hand, operating on windows is undoubtedly easier and this can be applied also to historical buildings [3] by reproducing the original window frame with high performance materials.…”

Section: Introductionmentioning

confidence: 99%

Experimental Air-Tightness Analysis in Mediterranean Buildings after Windows Retrofit

et al. 2016

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Abstract:Energy saving and Indoor Air Quality (IAQ) in buildings are strongly affected by air leakages. Several studies reveal that the energy loss owing to leaky windows can account for up to 40% of the total building energy demand. Furthermore, at the design stage, the possible infiltration of outdoor air through windows is not taken into account when determining the nominal outdoor airflow rate of the ventilation system. This practice may result in an oversizing of the ventilation system and consequent energy waste. Thus, the air-tightness class of a wall assembly should be assessed for each window component considering the type of material, the presence of the seal, the type of closure, the sealing and the maintenance condition. In this paper, the authors present the experimental results of air-tightness measurements carried out using the fan pressurization method in three residential buildings located in the Mediterranean region before and after a window retrofit. Two different window retrofits were investigated: the application of rubber seals on window frames and the substitution of existing windows with new certified high performance windows. The effectiveness of such retrofits was estimated also in terms of energy saving. Test results demonstrated a high variability of the building air tightness after window retrofits, despite the fact that air tight-certified windows were used.

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“…These methods have been widely studied in the literature and there are several studies in which the validity of their use is compared [24][25][26][27].…”

Section: Introductionmentioning

confidence: 99%

Determining the U-Value of Façades Using the Thermometric Method: Potentials and Limitations

et al. 2018

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Abstract:The thermal transmittance of building envelopes determines to a large extent the energy demand of buildings. Thus, there is a keen interest in having methods which can precisely evaluate thermal transmittance. From a scientific point of view, this study analyses the viability of the application of the thermometric method (THM), one of the most used methods in Spain. For this purpose, the test method has been improved by determining the adequate test conditions, the selection and installation of equipment, data acquisition and post-processing, and the estimation of uncertainty. We analyse eight case studies in a Mediterranean climate (Csa) to determine the potentials and limitations of the method. The results show that the values obtained through THM are valid under winter environmental conditions with relative uncertainties between 6% and 13%, while difficulties to perform the test in optimal conditions, and therefore to obtain valid results in warmer seasons, are detected. In this regard, the case studies which obtained a greater number of observations by performing the filtrate conditions were able to obtain representative results. Furthermore, there are significant differences depending on the kind of equipment and probes used during the experimental campaign. Finally, in warm climate regions a data filtrate can be considered for observations of a temperature difference higher than 5 • C, obtaining valid results for the case studies, although the rise in the thermal gradient can guarantee a greater stability of data.

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U-value in situ measurement for energy diagnosis of existing buildings

Cited by 185 publications

References 13 publications

Digital Multi-Probe Temperature Monitoring System for Long-Term on Field Measurements

Digital Multi-Probe Temperature Monitoring System for Long-Term on Field Measurements

Experimental Air-Tightness Analysis in Mediterranean Buildings after Windows Retrofit

Determining the U-Value of Façades Using the Thermometric Method: Potentials and Limitations

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