Marco Masoero | Politecnico di Torino (original) (raw)
Papers by Marco Masoero
Review: Inspections, Logbook, handling refrigerants, minimum requirements for technicians and com... more Review: Inspections, Logbook, handling refrigerants, minimum requirements for technicians and companies, trainings. New fluids: detection of refrigerant leaks; fluids recovery, recycling and destruction. European certification and training, welding, brazing. Issues concerning production and installation. Revisione regolamentazione sugli F-Gas: ispezioni, libretto d'impianto, manutenzione, requisiti minimi per i tecnici e le aziende, formazione. Nuovi fluidi: controllo perdite di refrigerante; recupero, riciclo e distruzione dei fluidi. Certificazioni e formazione in Europa e in Italia, brasatura. Problematiche legate alla produzione e installazione degli impianti.
An innovative heat accounting method for apartment buildings, named EcoThermo, based on the estim... more An innovative heat accounting method for apartment buildings, named EcoThermo, based on the estimation of water flow rates at each radiator by thermo-hydraulic modelling of the hot water distribution system, has been developed in the framework of the EU Programme FP7-SME-2012. In order to validate this approach and to compare it with conventional Heat Cost Allocators (HCA), a full-scale thermo-hydraulic simulator has been recently built at INRIM. This INRIM test facility represents a real-scale hot water heating system consisting of a gas-fired boiler and 40 radiators of different characteristics, mimicking a four-story residential building. Each radiator is equipped with an electromagnetic flow meter and a pair of short-stem Pt100 PRTs immersed in the water flow for inlet and outlet water temperature measurement, such that the radiator thermal output can be determined by direct metering, providing an accurate reference value against which indirect allocation methods can be compared and assessed. The paper describes in detail the INRIM thermohydraulic simulator, highlighting its design features and metrological capabilities and discussing key results of the investigations carried out so far on different heat accounting approaches. The accuracy of the EcoThermo model has also been assessed against direct heat metering and HCA approach.
Measurement, 2020
Nowadays, two different heat accounting methods are available: the direct method, based on heat m... more Nowadays, two different heat accounting methods are available: the direct method, based on heat meters, and the indirect one, based on heat cost allocators. Unfortunately, in existing buildings, due to the plant configuration, heat meters are often technically unfeasible or not cost efficient, whereas heat cost allocators can be easily installed in almost all conditions. At the same time, the indirect method relies on a high number of interconnected devices with installation and operative conditions often variable within the same building and influencing the on-field metrological performances. In this paper, the authors propose a novel "hybrid" method for accurate heat accounting combining the advantages of indirect method with the higher accuracy typical of direct methods. The proposed method has been experimented at INRIM, the primary metrology institute in Italy, assessing the onfield performance in a virtual eight-apartments building. The experimental results show that the proposed method always presents improved accuracy.
Proceedings of the ICA congress, 2019
The scaled reverberation room has proven to be an excellent tool for acoustic consultants and pro... more The scaled reverberation room has proven to be an excellent tool for acoustic consultants and professionals alike to carry out comparison tests between acoustic materials and 3D systems or structures. The suitability of a scaled reverberation room is currently under investigation for the evaluation of the frequency-dependent sound absorption. At present, no standard is available on the methods that could be used to derive acoustic absorption coefficients from scaled measurements. In this work practical aspects of ISO 354 have been investigated within a 1:5 scaled reverberation room: a balance has been sought between reducing sample size, to reduce the manufacturing costs of materials, and finding the appropriate sample area, thickness, orientation and edges treatment, to obtain reliable values at mid and high frequencies. Four different materials have been tested. The paper discusses some of the findings of the measurements conducted on the same materials in a full-scale reverberation room according to ISO 354, in a 1:5 scaled reverberation room and in an impedance tube according to ISO 10534-2. The absorption coefficients data collected have been effective in proving that small reverberation room tests can provide compatible results compared to standard ones in 400-5000 Hz frequency range.
This work concerns the use of FEM (Finite Element Methods) software to predict the vibration redu... more This work concerns the use of FEM (Finite Element Methods) software to predict the vibration reduction index Kij of several T-shaped junctions of both traditional heavy and lightweight structures. Much has been done so far with respect to FEM simulations of thermal bridges, but such methodology is not yet widespread in the field of acoustics. Research is needed to provide simplified formulas to be included in the new releases of the EN ISO 12354-1 standard, to overcome discrepancies between calculated and measured values. This should be done particularly for heavy junctions and combinations of heavy and lightweight junctions. In this study a validation of the simulation method has been shown, after its application to simple T-joints typical of traditional building constructions. The intention in the future is to use numerical simulations to provide data or formulas on Kij for more complex types of junctions and to validate simulations with in-laboratory measurements.
The structural elements with smaller section of the suspended bridge designed for connecting peni... more The structural elements with smaller section of the suspended bridge designed for connecting peninsular Italy and Sicily (Messina Strait), together with the suspension and current carrier cables of the railway line, in presence of energetic winds at 25-30 m/s speed, may determine turbulent vortices capable of generating sound waves exhibiting a strong fundamental frequency. Each element is characterized by a typical “acoustic signature” composed of a fundamental frequency, which represents the dominant tone, plus upper order harmonics which define the timbre of the emitted sound. The superposition of such harmonic components generates the “chords” whose audible component determines sensorial stimuli: the “voice” of the bridge. The aeroacoustic study which has allowed to define the acoustic signature of the bridge has been developed with a scientific approach based on analytical methods and numerical modelling of the aeroacoustic emission deriving from the interaction of wind with th...
intellagence.eu.com
This paper reports the results of acoustical measurements carried out in three small Italian oper... more This paper reports the results of acoustical measurements carried out in three small Italian opera houses. The theatres have approximately a volume of 1200 m 3 and are typical Italian theatres built between the late XVIII century and during the XIX century. To meet an increasing demand from the public, several theatres were built over the territory, mostly with the traditional horseshoe plan form with boxes in two or three tiers and gallery. The acoustical characterization based on the measurements of the reverberation time and other parameters described in ISO 3382, albeit necessary, is not exhaustive for this kind of theatres, in which the internal envelope is made entirely of wood. The contemporary literature, on the basis of empirical experience, underlined the superiority of wood, as a material with high acoustical quality. A measurement procedure was therefore developed in order to investigate the response of the wood envelope structure to the acoustical excitation. This study was performed through the analysis of the vibration of the sensible elements of the theatres. The aim of the measurements is to quantify and describe the sound energy that is radiated by the structure, related to the global energy that reaches the listener during a performance. Such analysis, coupled to the results of the measurements according to ISO 3382, has allowed a more detailed characterisation of the acoustical response of the three theatres.
Review: Inspections, Logbook, handling refrigerants, minimum requirements for technicians and com... more Review: Inspections, Logbook, handling refrigerants, minimum requirements for technicians and companies, trainings. New fluids: detection of refrigerant leaks; fluids recovery, recycling and destruction. European certification and training, welding, brazing. Issues concerning production and installation. Revisione regolamentazione sugli F-Gas: ispezioni, libretto d'impianto, manutenzione, requisiti minimi per i tecnici e le aziende, formazione. Nuovi fluidi: controllo perdite di refrigerante; recupero, riciclo e distruzione dei fluidi. Certificazioni e formazione in Europa e in Italia, brasatura. Problematiche legate alla produzione e installazione degli impianti.
An innovative heat accounting method for apartment buildings, named EcoThermo, based on the estim... more An innovative heat accounting method for apartment buildings, named EcoThermo, based on the estimation of water flow rates at each radiator by thermo-hydraulic modelling of the hot water distribution system, has been developed in the framework of the EU Programme FP7-SME-2012. In order to validate this approach and to compare it with conventional Heat Cost Allocators (HCA), a full-scale thermo-hydraulic simulator has been recently built at INRIM. This INRIM test facility represents a real-scale hot water heating system consisting of a gas-fired boiler and 40 radiators of different characteristics, mimicking a four-story residential building. Each radiator is equipped with an electromagnetic flow meter and a pair of short-stem Pt100 PRTs immersed in the water flow for inlet and outlet water temperature measurement, such that the radiator thermal output can be determined by direct metering, providing an accurate reference value against which indirect allocation methods can be compared and assessed. The paper describes in detail the INRIM thermohydraulic simulator, highlighting its design features and metrological capabilities and discussing key results of the investigations carried out so far on different heat accounting approaches. The accuracy of the EcoThermo model has also been assessed against direct heat metering and HCA approach.
Measurement, 2020
Nowadays, two different heat accounting methods are available: the direct method, based on heat m... more Nowadays, two different heat accounting methods are available: the direct method, based on heat meters, and the indirect one, based on heat cost allocators. Unfortunately, in existing buildings, due to the plant configuration, heat meters are often technically unfeasible or not cost efficient, whereas heat cost allocators can be easily installed in almost all conditions. At the same time, the indirect method relies on a high number of interconnected devices with installation and operative conditions often variable within the same building and influencing the on-field metrological performances. In this paper, the authors propose a novel "hybrid" method for accurate heat accounting combining the advantages of indirect method with the higher accuracy typical of direct methods. The proposed method has been experimented at INRIM, the primary metrology institute in Italy, assessing the onfield performance in a virtual eight-apartments building. The experimental results show that the proposed method always presents improved accuracy.
Proceedings of the ICA congress, 2019
The scaled reverberation room has proven to be an excellent tool for acoustic consultants and pro... more The scaled reverberation room has proven to be an excellent tool for acoustic consultants and professionals alike to carry out comparison tests between acoustic materials and 3D systems or structures. The suitability of a scaled reverberation room is currently under investigation for the evaluation of the frequency-dependent sound absorption. At present, no standard is available on the methods that could be used to derive acoustic absorption coefficients from scaled measurements. In this work practical aspects of ISO 354 have been investigated within a 1:5 scaled reverberation room: a balance has been sought between reducing sample size, to reduce the manufacturing costs of materials, and finding the appropriate sample area, thickness, orientation and edges treatment, to obtain reliable values at mid and high frequencies. Four different materials have been tested. The paper discusses some of the findings of the measurements conducted on the same materials in a full-scale reverberation room according to ISO 354, in a 1:5 scaled reverberation room and in an impedance tube according to ISO 10534-2. The absorption coefficients data collected have been effective in proving that small reverberation room tests can provide compatible results compared to standard ones in 400-5000 Hz frequency range.
This work concerns the use of FEM (Finite Element Methods) software to predict the vibration redu... more This work concerns the use of FEM (Finite Element Methods) software to predict the vibration reduction index Kij of several T-shaped junctions of both traditional heavy and lightweight structures. Much has been done so far with respect to FEM simulations of thermal bridges, but such methodology is not yet widespread in the field of acoustics. Research is needed to provide simplified formulas to be included in the new releases of the EN ISO 12354-1 standard, to overcome discrepancies between calculated and measured values. This should be done particularly for heavy junctions and combinations of heavy and lightweight junctions. In this study a validation of the simulation method has been shown, after its application to simple T-joints typical of traditional building constructions. The intention in the future is to use numerical simulations to provide data or formulas on Kij for more complex types of junctions and to validate simulations with in-laboratory measurements.
The structural elements with smaller section of the suspended bridge designed for connecting peni... more The structural elements with smaller section of the suspended bridge designed for connecting peninsular Italy and Sicily (Messina Strait), together with the suspension and current carrier cables of the railway line, in presence of energetic winds at 25-30 m/s speed, may determine turbulent vortices capable of generating sound waves exhibiting a strong fundamental frequency. Each element is characterized by a typical “acoustic signature” composed of a fundamental frequency, which represents the dominant tone, plus upper order harmonics which define the timbre of the emitted sound. The superposition of such harmonic components generates the “chords” whose audible component determines sensorial stimuli: the “voice” of the bridge. The aeroacoustic study which has allowed to define the acoustic signature of the bridge has been developed with a scientific approach based on analytical methods and numerical modelling of the aeroacoustic emission deriving from the interaction of wind with th...
intellagence.eu.com
This paper reports the results of acoustical measurements carried out in three small Italian oper... more This paper reports the results of acoustical measurements carried out in three small Italian opera houses. The theatres have approximately a volume of 1200 m 3 and are typical Italian theatres built between the late XVIII century and during the XIX century. To meet an increasing demand from the public, several theatres were built over the territory, mostly with the traditional horseshoe plan form with boxes in two or three tiers and gallery. The acoustical characterization based on the measurements of the reverberation time and other parameters described in ISO 3382, albeit necessary, is not exhaustive for this kind of theatres, in which the internal envelope is made entirely of wood. The contemporary literature, on the basis of empirical experience, underlined the superiority of wood, as a material with high acoustical quality. A measurement procedure was therefore developed in order to investigate the response of the wood envelope structure to the acoustical excitation. This study was performed through the analysis of the vibration of the sensible elements of the theatres. The aim of the measurements is to quantify and describe the sound energy that is radiated by the structure, related to the global energy that reaches the listener during a performance. Such analysis, coupled to the results of the measurements according to ISO 3382, has allowed a more detailed characterisation of the acoustical response of the three theatres.