Indoor-environment simulator for control design purposes

Tomažič, Simon; Logar, Vito; Kristl, Živa; Krainer, Aleš; Škrjanc, Igor; Košir, Mitja

doi:10.1016/j.buildenv.2013.08.026

Cited by 18 publications

(13 citation statements)

References 21 publications

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“…Improved XPS foam insulation with better material efficiency (and lower thermal conductivity) was developed in [9]. An experimental study concerning the hygrothermal behaviour of retrofit solutions as applied to older stone masonry walls has, for instance, been presented in [25]. In [26] XPS foam was applied as part of a vibration isolating screen installed in soil near a test public transport track.…”

Section: Materials For Thermal Insulation Boardsmentioning

confidence: 99%

Seismic Aspects of the Application of Thermal Insulation Boards Beneath the Foundations of Buildings

Koren¹,

Kilar²,

Azinović³

2016

Insulation Materials in Context of Sustainability

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In recent years, there has been a significant increase in the construction of energyefficient buildings. These buildings are mainly characterized by their thermal envelope, which needs to follow the complete outer perimeter of the building without any interruptions, to avoid thermal bridges. It has been observed, however, that the specific new details which prevent the occurrence of thermal bridges can, in many cases, substantially affect the structural integrity of such buildings during earthquakes. This chapter deals with the seismic aspects of the application of thermal insulation (TI) boards beneath the foundations of buildings. For this purpose, the mechanical characteristics of the most commonly used material in practice (i.e., extruded polystyrene-XPS) were experimentally determined. Additionally, the shear behaviour of differently composed TI foundation sets was investigated and their friction capacity estimated. The authors have proposed a new solution for the foundation detail, which is based on controlling the sliding mechanism between the individual layers of TI boards in order to reduce the seismic forces induced on the superstructure. The proposed detail with a specially designed sliding layer surface is made of commonly used TI materials for modern passive houses, thus reducing the potential additional costs. The solution was verified by means of nonlinear dynamic analysis of several realistic building models and various friction coefficients between XPS boards. The selected results are presented in terms of fragility curves for the occurrence of sliding between the layers of XPS boards. Based on these curves, the desired seismic response scenario and level of protection of a building structure could be selected.

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Section: Materials For Thermal Insulation Boardsmentioning

confidence: 99%

Seismic Aspects of the Application of Thermal Insulation Boards Beneath the Foundations of Buildings

Koren¹,

Kilar²,

Azinović³

2016

Insulation Materials in Context of Sustainability

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“…This enhancement was able to solve the problems that an incorrect sizing of original HVAC systems had determined on comfort conditions [6]. In fact, building management systems (BMSs) are becoming increasingly important as they are an efficient means because they can both make buildings consume less and improve indoor air quality [7]. However, the implementation of these systems is still limited, even because of the need for setting BMS parameters at the design stage; this asks for the availability of dynamic simulators [7].…”

Section: Introductionmentioning

confidence: 99%

“…In fact, building management systems (BMSs) are becoming increasingly important as they are an efficient means because they can both make buildings consume less and improve indoor air quality [7]. However, the implementation of these systems is still limited, even because of the need for setting BMS parameters at the design stage; this asks for the availability of dynamic simulators [7]. Indeed, dynamic models are of crucial importance in implementing an effective control strategy [8].…”

Section: Introductionmentioning

confidence: 99%

HVAC System

2018

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This chapter focuses on advanced tools for transient energy simulation of existing buildings. Budget constraints often hinder the possibility of implementing large-scale retrofit projects. As a consequence, designers must work out low-cost renovation, which asks for a deep knowledge of the current state of the buildings. Furthermore, the performances of heating plants in existing buildings can be enhanced through the improvement of the control of the system. These types of retrofit actions can be carried out with a limited budget, but asks for the availability of very accurate transient energy simulation tools, which can compare the current and the renovated scenarios. On top of them, cost-benefit analyses can be developed. In this chapter, a model of a small hospital is developed in the Dymola/Modelica environment. The high flexibility of the transient simulation model and the very good agreement between numerical estimations and measurements are shown. Then, one scenario regarding enhanced regulation of the heating system by means of a customized ambient temperature control system is developed, and the expected energy savings are estimated.

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“…First, designers should be allowed to easily change parameters and immediately evaluate results, as explained in Tomažič et al (2013). Even Nagano et al (2006) showed at what extent user-friendly design and performance prediction tools can help in the execution of quick feasibility studies.…”

Section: Introductionmentioning

confidence: 99%

Development and calibration of a model for the dynamic simulation of fans with induction motors

Vaccarini

Carbonari

Casals

2017

Applied Thermal Engineering

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In this paper a model for the dynamic simulation of fans used in mechanical air supply systems is described. Thanks to this model, the behavior of fans subject to control by variable frequency drives (VFD) can be predicted, which includes power absorbed by the fan and expected ventilation rates. Hence, it can help design energy control systems for buildings. The proposed model was based on the Modelica language and was developed from the dynamic phasor domain representation, because this representation is a trade-off between the basic non transient representation, that is computationally efficient but cannot describe fan dynamics, and the dynamic time domain model, that is the most representative one but computationally very demanding. A comparison among these models showed that, within fan frequency variations typical of ventilation systems in buildings, the phasor domain model is as representative as the more complex dynamic time domain model in terms of prediction of the dynamic behavior, that is neglected by the basic non transient model. Moreover, the new phasor domain model was validated against measured data relative to a fan installed in a subway station in Barcelona. Thanks to this model, energy consumption of dynamically driven fans can be estimated at the simulation stage, at the expense of a reasonable computational effort.Peer ReviewedPostprint (author's final draft

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Indoor-environment simulator for control design purposes

Cited by 18 publications

References 21 publications

Seismic Aspects of the Application of Thermal Insulation Boards Beneath the Foundations of Buildings

Seismic Aspects of the Application of Thermal Insulation Boards Beneath the Foundations of Buildings

HVAC System

Development and calibration of a model for the dynamic simulation of fans with induction motors

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