Whole-building simulation with symbolic DAE equations and general purpose solvers

Sahlin, Per; Eriksson, Lars; Grozman, Pavel; Johnsson, Hans; Шаповалов, А. В.; Vuolle, Mika

doi:10.1016/j.buildenv.2004.01.019

Cited by 91 publications

(45 citation statements)

References 2 publications

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“…The models are written in neutral model format (NMF) or Modelica, which serve as a readable document and a computer code. Via translators, the models can be used in several modular simulation environments [34,35].…”

Section: Simulations Methods For Casementioning

confidence: 99%

Effects of Building Occupancy on Indicators of Energy Efficiency

2017

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Abstract:The potential to reduce energy consumption in buildings is high. The design phase of the building is very important. In addition, it is vital to understand how to measure the energy efficiency in the building operation phase in order to encourage the right efficiency efforts. In understanding the building energy efficiency, it is important to comprehend the interplay of building occupancy, space efficiency, and energy efficiency. Recent studies found in the literature concerning energy efficiency in office buildings have concentrated heavily on the technical characteristics of the buildings or technical systems. The most commonly used engineering indicator for building energy efficiency is the specific energy consumption (SEC), commonly measured in kWh/m 2 per annum. While the SEC is a sound way to measure the technical properties of a building and to guide its design, it obviously omits the issues of building occupancy and space efficiency. This paper studies existing energy efficiency indicators and introduces a new indicator for building energy efficiency which takes into account both space and occupancy efficiency.

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Section: Simulations Methods For Casementioning

confidence: 99%

Effects of Building Occupancy on Indicators of Energy Efficiency

2017

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“…The building energy simulation of IDA ICE (EQUA 2009a; Sahlin et al 2004) has been used for this study. IDA ICE is a dynamic multi-zone simulation with simple user interface and full flexibility for advanced users.…”

Section: Optical Properties Of Organic Coated Steel Sheetsmentioning

confidence: 99%

Radiation properties of coil-coated steel in building envelope surfaces and the influence on building thermal performance

Joudi¹

2015

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Recent studies have shown that the optical properties of building exterior surfaces are important in terms of energy use and thermal comfort. While the majority of the studies are related to exterior surfaces, the radiation properties of interior surfaces are less thoroughly investigated. Development in the coil-coating industries has now made it possible to allocate different optical properties for both exterior and interior surfaces of steel-clad buildings. The aim of this thesis is to investigate the influence of surface radiation properties with the focus on the thermal emittance of the interior surfaces, the modeling approaches and their consequences in the context of the building energy performance and indoor thermal environment.The study consists of both numerical and experimental investigations. The experimental investigations include parallel field measurements on three similar test cabins with different interior and exterior surface radiation properties in Borlänge, Sweden, and two ice rink arenas with normal and low emissive ceiling in Luleå, Sweden. The numerical methods include comparative simulations by the use of dynamic heat flux models, Building Energy Simulation (BES), Computational Fluid Dynamics (CFD) and a coupled model for BES and CFD. Several parametric studies and thermal performance analyses were carried out in combination with the different numerical methods.The parallel field measurements on the test cabins include the air, surface and radiation temperatures and energy use during passive and active (heating and cooling) measurements. Both measurement and comparative simulation results indicate an improvement in the indoor thermal environment when the interior surfaces have low emittance. In the ice rink arenas, surface and radiation temperature measurements indicate a considerable reduction in the ceiling-to-ice radiation by the use of low emittance surfaces, in agreement with a ceiling-to-ice radiation model using schematic dynamic heat flux calculations.The measurements in the test cabins indicate that the use of low emittance surfaces can increase the vertical indoor air temperature gradients depending on the time of day and outdoor conditions. This is ii in agreement with the transient CFD simulations having the boundary condition assigned on the exterior surfaces. The sensitivity analyses have been performed under different outdoor conditions and surface thermal radiation properties. The spatially resolved simulations indicate an increase in the air and surface temperature gradients by the use of low emittance coatings. This can allow for lower air temperature at the occupied zone during the summer.The combined effect of interior and exterior reflective coatings in terms of energy use has been investigated by the use of building energy simulation for different climates and internal heat loads. The results indicate possible energy savings by the smart choice of optical properties on interior and exterior surfaces of the building.Overall, it is concluded that the interior re...

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“…The models are written in Neutral Model Format (NMF) or Modelica, which serves at the same time as a readable document and a computer code. Via translators, the models can be used in several modular simulation environments [22,23].…”

Section: Simulation Toolmentioning

confidence: 99%

Heating Energy and Peak-Power Demand in a Standard and Low Energy Building

Airaksinen

Vuolle²

2013

Energies

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Building energy efficiency legislation has traditionally focused on space heating energy consumption. This has led to a decrease in energy consumption, especially in space heating. However, in the future when more renewable energy is used both on site and in energy systems, the peak energy demand becomes more important with respect to CO 2 emissions and energy security. In this study it was found out the difference between space heating energy consumption was 55%-62% when a low energy and standard building were compared. However, the difference in peak energy demands was only 28%-34%, showing the importance of paying attention to the peak demands as well.

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Whole-building simulation with symbolic DAE equations and general purpose solvers

Cited by 91 publications

References 2 publications

Effects of Building Occupancy on Indicators of Energy Efficiency

Effects of Building Occupancy on Indicators of Energy Efficiency

Radiation properties of coil-coated steel in building envelope surfaces and the influence on building thermal performance

Heating Energy and Peak-Power Demand in a Standard and Low Energy Building

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