Computational Fluid Dynamic Modelling of Thermal Periodic Stabilized Regime in Passive Buildings

The periodic stabilized regime is the condition where the temperature of each point of a certain environment varies following a periodic law. This phenomenon occurs in many practical applications, such as passive or ancient buildings not equipped with Heating, Ventilating and Air Conditioning HVAC systems and located in latitudes where the temperature greatly varies with Earth’s daily cycles. Despite that, the study of transient phenomena is often simplified, i.e., considering negligible the thermal response of the indoor microclimate. An exact solution to enclosures whose microclimate is free to evolve under a periodic stabilized regime does not exist nowadays, also from an analytical point of view. The aim of this study is to parametrically analyze the thermal variations inside a room when a transient periodic temperature is applied on one side. The phenomenon has been numerically studied through Computational Fluid Dynamics (CFD) and analytically validated using a function that reproduces the daily variation of the outdoor temperature. The results of this research would lay the groundwork to develop analytical correlations to solve and predict the thermal behavior of environments subject to a periodic stabilized regime.

[1]  Min Zeng,et al.  Transient heat flux measurement of natural convection in an inclined enclosure with time-periodically-varying wall temperature , 2011 .

[2]  A. Abdel-azim.  Fundamentals of Heat and Mass Transfer , 2011 .

[3]  Ferdinando Salata,et al.  Evaluation of Different Urban Microclimate Mitigation Strategies through a PMV Analysis , 2015 .

[4]  Fabio Nardecchia,et al.  How temperature affects the airflow around a single-block isolated building , 2016 .

[5]  S. Acharya,et al.  Influence of wall conduction on natural convection in an inclined square enclosure , 1987 .

[6]  Ahmet Koca,et al.  Effects of Inclination Angle on Natural Convection in Composite Walled Enclosures , 2011 .

[7]  Fabrizio Cumo,et al.  Technologies And Strategies To Design Sustainable Tourist Accommodations In Areas Of High Environmental Value Not Connected To The Electricity Grid , 2015 .

[8]  Davide Astiaso Garcia,et al.  Analysis of energy performance improvements in Italian residential buildings , 2015 .

[9]  Claudia Guattari,et al.  In Situ Thermal Transmittance Measurements for Investigating Differences between Wall Models and Actual Building Performance , 2015 .

[10]  J. C. Jaeger,et al.  Conduction of Heat in Solids , 1952 .

[11]  Luca Evangelisti,et al.  An Integrated Approach for an Historical Buildings Energy Analysis in a Smart Cities Perspective , 2014 .

[12]  Adrian Bejan,et al.  The resonance of natural convection in an enclosure heated periodically from the side , 1993 .

[13]  Sasa Kenjeres,et al.  Natural convection in partitioned two-dimensional enclosures at higher Rayleigh numbers , 1996 .

[14]  Fabio Botta,et al.  Passive cooling design options to improve thermal comfort in an Urban District of Rome, under hot summer conditions , 2013 .

[15]  Fabio Fantozzi,et al.  Thermal analysis of the building envelope of lightweight temporary housing , 2014 .

[16]  Fabio Nardecchia,et al.  CFD analysis for the validation of archaeological hypotheses – The indoor microclimate of ancient storage-rooms , 2016 .

[17]  Fabio Nardecchia,et al.  A novel approach to CFD analysis of the urban environment , 2015 .

[18]  Moghtada Mobedi,et al.  Conjugate natural convection in a square cavity with finite thickness horizontal walls , 2008 .

[19]  M. Hasnaoui,et al.  Combined Effect of Radiation and Natural Convection in a Square Cavity Differentially Heated with a Periodic Temperature , 2008 .

[20]  Luca Evangelisti,et al.  Energy Retrofit Strategies for Residential Building Envelopes: An Italian Case Study of an Early-50s Building , 2015 .

[21]  Peter D. Richardson,et al.  Fundamentals of Heat Transfer , 1962 .

[22]  Fabio Fantozzi,et al.  On the optimization of building envelope thermal performance , 2003 .

[23]  S. Orszag,et al.  Renormalization group analysis of turbulence. I. Basic theory , 1986 .

[24]  Ferdinando Salata,et al.  A Methodological Comparison between Energy and Environmental Performance Evaluation , 2015 .

[25]  J. C. Roy,et al.  CFD PREDICTION OF THE NATURAL VENTILATION IN A TUNNEL-TYPE GREENHOUSE: INFLUENCE OF WIND DIRECTION AND SENSIBILITY TO TURBULENCE MODELS , 2005 .

[26]  Andrea Vallati,et al.  Analysis of thermal field within an urban canyon with variable thermophysical characteristics of the building's walls , 2015 .

[27]  E. K. Lakhal,et al.  NATURAL CONVECTION IN A SQUARE ENCLOSURE HEATED PERIODICALLY FROM PART OF THE BOTTOM WALL , 1995 .

[28]  E. Bilgen,et al.  Natural convection in enclosures with partial partitions , 2002 .

[29]  M. Hasnaoui,et al.  Natural Convection Heat Transfer Enhancement in a Square Cavity Periodically Cooled from Above , 2013 .

[30]  M. Kazmierczak,et al.  Buoyancy-driven flow in an enclosure with time periodic boundary conditions , 1992 .

[31]  Andrea Vallati,et al.  CFD Analysis of Convective Heat Transfer Coefficient on External Surfaces of Buildings , 2015 .

[32]  Mohammed Hasnaoui,et al.  Transient natural convection in a square enclosure with horizontal walls submitted to periodic temperatures , 1999 .

[33]  J. L. Lage,et al.  A dynamic thermal insulator: Inducing resonance within a fluid saturated porous medium enclosure heated periodically from the side , 1994 .

[34]  S. Orszag,et al.  Renormalization group analysis of turbulence. I. Basic theory , 1986, Physical review letters.

[35]  Fabio Bisegna,et al.  The architecture of warehouses: A multidisciplinary study on thermal performances of Portus' roman store buildings , 2015 .

[36]  Ferdinando Salata,et al.  Methodological Approach to the Energy Analysis of Unconstrained Historical Buildings , 2015 .