THERMAL ANALYSIS OF A MULTIFUNCTIONAL FLOOR ELEMENT (original) (raw)

Dynamic thermal analysis of a new lightweight prefabricated building system

In the last few years, to meet the need of build efficient homes in a short time and with maximum constructive simplification, lightweight prefabricated building systems have proved to be particularly suitable, especially in geographical areas which must deal with emergency situations. In this paper the winter and summer thermal performance of a building prototype, realised with modular steel framed elements, have been studied, with both computational simulations and on-site measurements. Special attention has been paid to the optimisation of the dynamic thermal performance of the multi-layered envelope structures. The dynamic thermal behaviour of the outer wall, analysed and discussed in details in the paper, shows that it is possible to improve the performance of lightweight walls by using an optimised stratigraphy characterised by an opportune sequence of resistive and capacitive layers

An Innovative Building Based on Active Thermal Slab Systems

The rising demand of primary energy for heating and cooling of residential and commercial buildings implies the design and the realization of energy efficient buildings with a minimal impact on the environment. Many new technologies allowing low supply temperature with low specific emissions and new buildings envelopes (good insulation and solar shadings) seem powerful, but there is the need to optimise control strategies for achieving this aim. The use of active thermal slab sys- tems is a promising solution. Active thermal slab systems are being increasingly used in the centre and in the north of Europe, but some uncertainties still remain, especially as far as the control strategy is concerned. Moreover the operation of these buildings has to be investigated more in depth and the resort to field measurements is needed. In this work the use of active thermal slabs systems is described and an innovative pilot pro- ject, the building of ZUB (The Centre for Sustainable Building) at t...

Heat Transfer Model of a Structural Element for the Transformation of Housing Sustainability

Civil Engineering and Architecture, 2020

Nowadays, it is common to find heat transfer systems inside buildings. In the present work, a heat transfer system applied to a structural element of a building is proposed, which is produced with a system embedded inside the wall from the internal transport of the liquid that allows increasing or decreasing the interior temperature. For this, a mathematical model developed from a steady-state, one-dimensional energy balance was analytically solved. The system was applied in a circadian way with the data applicable to maximum and minimum temperatures in the city of Monterrey, Nuevo León. Experimentally, the thermal properties of the proposed material were obtained and a wall section was developed with the heat transfer system. An increase in thermal resistance is obtained that allows reducing the temperature changes on the interior face of the wall. The structural element presents thermal resistance values that increase while maintaining the fluid inside the wall. The system justifies the use of fluid within the vertical element that can promote comfort. Using this system would reduce energy consumption by up to 60% compared to a traditional cooling system. The objective of this work was to obtain a mathematical model that approximately describes the behavior of the interior temperature of the wall as a function of the exterior temperature and the flow and temperature of the cooling water, to evaluate the energy efficiency of the heat exchanger.

Energy Balance of a Low Energy House with Building Structures with Active Heat Transfer Control

Periodica Polytechnica Mechanical Engineering, 2021

A qualitatively new dimension has been introduced to the issue of building structures for energy-efficient buildings by the system of Active Thermal Insulation (ATI), which is already applied in the construction of such buildings. ATI are embedded pipe systems in the envelope structures of buildings, into which we supply a heat-carrying medium with adjusted temperature, so this constitutes a combined building-energy system. This introduces the concept of an internal energy source understood as an energy system integrated into the zone between the static part and the thermal insulation part of the building structure envelope. Under certain conditions, the ATI can serve as a heat recuperator or as an energy collector for a heat pump application. ATI consists of pipe systems embedded in building structures, in which the medium circulates heated by energy from any heat source. The function of the system is to reduce or eliminate heat losses through non-transparent structures in the wint...

Optimization of PCM embedded in a floor panel developed for thermal management of the lightweight envelope of buildings

Implementation of phase change materials (PCMs) into building components allows their thermal perfor-mance to be enhanced, reducing indoor temperature fluctuations and improving the occupant comfort.A practical problem to solve is the possibility of leakage when the PCM is under the liquid state. In thisstudy, a new component using PCMs is described. This component derives from an existing slab hav-ing cylindrical cavities which is used in floors/ceilings. The cavities are filled with a polymer–paraffincomposite and leaks are avoided, due to, both the use of the composite and the insertion inside cavities.This study is based on numerical simulations whose results are compared to experimental ones withthe same boundary conditions in order to validate the model. The PCM was introduced inside the cavitieswith an annular repartition and different percentages. A new indicator was introduced (PCM activity)that allows an evaluation of the amount of PCM to be used in such a component. With this indicator theoptimal percentage of PCM has been determined.

Parametric study of the energy potential of a building’s envelope with integrated energy-active elements

Acta Polytechnica

Building structures with integrated energy-active elements (BSIEAE) present a progressive alternative for building construction with multifunctional energy functions. The aim was to determine the energy potential of a building envelope with integrated energy-active elements in the function of direct-heating, semi-accumulation and accumulation of large-area radiant heating. The research methodology consists in an analysis of building structures with energy-active elements, creation of mathematical-physical models based on the simplified definition of heat and mass transfer in radiant large-area heating, and a parametric study of the energy potential of individual variants of technical solutions. The results indicate that the increase in heat loss due to the location of the tubes in the structure closer to the exterior is negligible for Variant II, semi-accumulation heating, and Variant III, accumulation heating, as compared to Variant I, direct heating, it is below 1 % of the total d...

Contribution to the Research and Development of Innovative Building Components with Embedded Energy-Active Elements

Coatings

The research described in this study focuses on the innovation and optimization of building envelope panels with integrated energy-active elements in the thermal barrier function. It is closely related to developing and implementing the prototype prefabricated house IDA I with combined building-energy systems using renewable energy sources. We were inspired by the patented ®ISOMAX panel and system, which we have been researching and innovating for a long time. The thermal barrier has the function of eliminating heat loss/gain through the building envelope. By controlling the heat/cold transfer in the thermal barrier, it is possible to eliminate the thickness of the thermal insulation of the building envelope and thus achieve an equivalent thermal resistance of the building structure that is equal to the standard required value. The technical solution of the ISOMAX panel also brings, besides the use of the thermal barrier function, the function of heat/cold accumulation in the load-b...

Application of Floor Heating System in New Generation Sustainable Green Domes

One of the most important energy consumers in rural and urban areas are buildings. Therefore, the role of heating and cooling systems is considerable in buildings with high level of energy usage. Floor heating system is a form of central heating system which achieves indoor climate control for thermal comfort using conduction, radiation and convection heat transfer. In the present study, application of floor heating system in a dome shape room is analyzed numerically. Moreover, the obtained results are compared to the floor heating system in an ordinary room with the same volume and 6m×4m×3m dimensions. The required energy to establish thermal comfort for residents in desired rooms is calculated by simulating the velocity and temperature fields. The velocity and temperature distribution as well as the floor temperature are compared in both systems. The primary results showed that in the dome shape room, the required floor temperature for providing thermal comfort condition is less than the ordinary room. However, the total area of the floor is higher in the dome shape room than the ordinary room

Constructal design applications in buildings: Radiant cooling panels and thermochemical energy storage

Heat Transfer, 2020

The present work highlights how the constructal law is implemented in the search for buildings' performance from a thermal lookout. The authors reviewed some of their research efforts through two applications: radiant cooling panels and thermochemical energy storage in buildings. In a deterministic approach, it was demonstrated that the overall performance of such systems could be anticipated. Under the same operating conditions, cooling panel with dendritic flow configurations exhibited better global performance compared to the design with a serpentine flow layout. Two configurations of elemental reactors for thermochemical energy storage were studied: reactive material in beds layers and impregnated within a tube. A theoretical approach allowed to predict the impact of the Bejan number on the sensible heat output for the first configuration, when numerical experiments allowed to determine how to morph the tube shape to increase thermal performances. K E Y W O R D S buildings, constructal law, efficient design, numerical simulations, radiant cooling panel, thermochemical energy storage 1 | INTRODUCTION Since it was first introduced two decades ago, the constructal law has been widely applied in the search for better performance of systems crossed by flows. If the studies began on the street network design, 1 the principal field of application became heat and mass transfer. 2-7 Thus some

Advanced Design and Commissioning Tools for Energy-Efficient Building Technologies

2012

This multi-year project generated significant new and improved software design tools and commissioning guidelines for underfloor air distribution (UFAD) systems, new performance guidelines for radiant slab cooled buildings, and an updated advanced Berkeley thermal comfort model. This final report presents detailed results in four major task areas as summarized below.