scholarly journals Limits to polycentricity? Institutional layering and policy feedbacks of building energy performance requirements in Sweden

2020 ◽  
Vol 30 (2) ◽  
pp. 71-83 ◽  
Author(s):  
Nora Smedby
Keyword(s):  
Building Energy ◽  
Energy Performance ◽  
Building Energy Performance ◽  
Performance Requirements ◽  
Institutional Layering

scholarly journals On the limits of the quasi-steady-state method to predict the energy performance of low-energy buildings

2018 ◽  
Vol 22 (Suppl. 4) ◽  
pp. 1117-1127 ◽  
Author(s):  
Ilaria Ballarini ◽  
Elisa Primo ◽  
Vincenzo Corrado
Keyword(s):  
Steady State ◽  
Building Energy ◽  
Energy Performance ◽  
Zero Energy ◽  
Building Energy Performance ◽  
Performance Requirements ◽  
Zero Energy Building ◽  
Steady State Method ◽  
Low Energy Buildings ◽  
State Method

The recent European energy policies progressively introduced more restrictive energy performance requirements aimed at achieving the nearly zero-energy building target for all new buildings and major renovations. To check compliance with these requirements, the building energy performance can be evaluated through different calculation methods, as widely presented in literature. The present article is aimed at identifying in which boundary conditions (e. g. climate, use category, building size, thermal insulation level) a simplified steady-state calculation method can predict with sufficient accuracy the energy performance of low-energy buildings if compared with a dynamic simulation model. The analysis was performed on two building types, representative of the Italian residential typology, located in three different climatic zones and characterised by two insulation levels. The insulation levels fit the U-values of the notional reference building, established by the Italian legislation for checking compliance with energy performance requirements in two different steps; the first level is in force until 2020, while the second level is that of a reference nearly zero-energy building in force from 2021 onwards. The building energy performance, in terms of net energy needs for space heating and space cooling, was assessed by means of both the monthly calculation method of CEN standards and the detailed simulation model of EnergyPlus. Consistency options were applied to the models to guarantee that their outputs could be comparable. The quasi-steady-state method demonstrated to predict the cooling energy need quite well, but to lose in accuracy when the weight of the thermal transfer in the energy balance increases.

scholarly journals Influence of Lightweight Aggregate Concrete Materials on Building Energy Performance

Buildings ◽  
2021 ◽  
Vol 11 (3) ◽  
pp. 94
Author(s):  
Tara L. Cavalline ◽  
Jorge Gallegos ◽  
Reid W. Castrodale ◽  
Charles Freeman ◽  
Jerry Liner ◽  
...  
Keyword(s):  
Thermal Properties ◽  
Building Materials ◽  
Energy Savings ◽  
Lightweight Concrete ◽  
Lightweight Aggregate ◽  
Building Energy ◽  
Energy Performance ◽  
Energy Simulation ◽  
Building Energy Simulation ◽  
Building Energy Performance

Due to their porous nature, lightweight aggregates have been shown to exhibit thermal properties that are advantageous when used in building materials such as lightweight concrete, grout, mortar, and concrete masonry units. Limited data exist on the thermal properties of materials that incorporate lightweight aggregate where the pore system has not been altered, and very few studies have been performed to quantify the building energy performance of structures constructed using lightweight building materials in commonly utilized structural and building envelope components. In this study, several lightweight concrete and masonry building materials were tested to determine the thermal properties of the bulk materials, providing more accurate inputs to building energy simulation than have previously been used. These properties were used in EnergyPlus building energy simulation models for several types of commercial structures for which materials containing lightweight aggregates are an alternative commonly considered for economic and aesthetic reasons. In a simple model, use of sand lightweight concrete resulted in prediction of 15–17% heating energy savings and 10% cooling energy savings, while use of all lightweight concrete resulted in prediction of approximately 35–40% heating energy savings and 30% cooling energy savings. In more complex EnergyPlus reference models, results indicated superior thermal performance of lightweight aggregate building materials in 48 of 50 building energy simulations. Predicted energy savings for the five models ranged from 0.2% to 6.4%.

Assessing Chinese campus building energy performance using fuzzy analytic network approach

2015 ◽  
Vol 29 (6) ◽  
pp. 2629-2638 ◽  
Author(s):  
Shushan Hu ◽  
Feng Liu ◽  
Cunchen Tang ◽  
Xiaojun Wang ◽  
Huaibei Zhou
Keyword(s):  
Building Energy ◽  
Energy Performance ◽  
Network Approach ◽  
Building Energy Performance ◽  
Campus Building
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