Estimation of Lighting Energy Savings From Atrium Daylighting for Office Buildings

2014 ◽  
Author(s):  
Moncef Krarti
Keyword(s):  
Energy Savings ◽  
Office Buildings ◽  
Energy Reduction ◽  
Passive Heating ◽  
Heating And Cooling ◽  
Light Levels ◽  
Surface Finishes ◽  
Lighting Energy ◽  
Simplified Calculation ◽  
Story Building

Atria can offer several benefits to deep plan commercial and office buildings. This includes passive heating and cooling, ventilation, and daylighting. In order to use daylight effectively in atrium buildings, the characteristics that affect the light levels and distribution must be taken into account and analyzed. These elements include roofs, shapes, well geometries, surface finishes, and glazing types. The analysis outlined in this paper shows that a larger atrium area, higher window-to-wall ratio, clear windows, and a multi-story building provide the highest energy savings. The paper also presents a simplified calculation method to determine the percent lighting energy reduction attributed to atria in office buildings with continuous dimming. The lighting energy savings due to daylighting from atria can be up to 40%.

scholarly journals Energy savings due to the use of PCM for relocatable lightweight buildings passive heating and cooling in different weather conditions

2016 ◽  
Vol 129 ◽  
pp. 274-283 ◽  
Author(s):  
Paula Marin ◽  
Mohammad Saffari ◽  
Alvaro de Gracia ◽  
Xibingyan Zhu ◽  
Mohammed M. Farid ◽  
...  
Keyword(s):  
Energy Savings ◽  
Weather Conditions ◽  
Passive Heating ◽  
Heating And Cooling

Lighting Energy Savings From Daylighting Through Skylights for Warehouses

2007 ◽  
Author(s):  
Aymen Mechergui ◽  
Moncef Krarti
Keyword(s):  
Calculation Method ◽  
Open Space ◽  
Energy Use ◽  
Energy Savings ◽  
Control Strategies ◽  
Simulation Based ◽  
Simplified Method ◽  
The World ◽  
Lighting Energy ◽  
Simplified Calculation

The paper provides the results of a simulation-based analysis to estimate the potential savings in electrical lighting energy use associated with daylighting controls using skylights for open space warehouses. First, the effectiveness of daylighting controls is investigated for several skylight opening areas, glazing types, control strategies, and several locations in Tunisia. A simplified calculation method is then developed to estimate the annual savings in electrical lighting energy use due to daylighting controls in warehouses. The simplified method has been developed and validated for several locations throughout the world.

scholarly journals Performance Simulation and Analysis of Occupancy-Based Control for Office Buildings with Variable-Air-Volume Systems

Energies ◽  
2020 ◽  
Vol 13 (15) ◽  
pp. 3756
Author(s):  
Weimin Wang ◽  
Jian Zhang ◽  
Michael R. Brambley ◽  
Benjamin Futrell
Keyword(s):  
Energy Use ◽  
Energy Savings ◽  
Building Energy ◽  
Cold Climate ◽  
Office Buildings ◽  
Airflow Rate ◽  
Variable Air Volume ◽  
Heating And Cooling ◽  
Air Volume ◽  
Terminal Design

Variable-air-volume (VAV) systems are used in many office buildings. The minimum airflow rate setting of VAV terminal boxes has a significant impact on both energy consumption and indoor air quality. Conventional controls usually have the terminal’s minimum airflow rate at a constant (e.g., 30% or more of the terminal design airflow rate), irrespective of the occupancy status, which may cause problems, such as excessive simultaneous heating and cooling, under ventilation, and thermal comfort issues. This paper examines the potential of energy savings from occupancy-based controls (OBCs). The sensed occupancy information, either occupant presence or people count, is used to determine the airflow rate of terminal boxes, the thermostat setpoints, and the lighting control. Using EnergyPlus, a whole-building energy modeling software, the energy savings of OBC strategies are evaluated for representative existing medium office buildings in the U.S. The simulation results show that the conventional OBC, based on occupant presence sensing, can save 8% of whole-building energy use in Miami (hot climate) for systems without air-side economizer and about 13% in both Baltimore (mixed climate) and Chicago (cold climate). Comparatively, the advanced OBC, based on people counting, can save 8% in Miami to 23% in Baltimore for systems with economizers. The outdoor-air fraction of the supply air from air-handling units significantly affects the potential energy savings from the advanced OBC strategy. In addition to energy savings, the advanced OBC satisfies the zone ventilation during all occupied hours over the whole year.

A Comparative Study of the Building Energy Performance of Thermotropic Windows

2017 ◽  
Vol 42 (1) ◽  
pp. 16-22
Author(s):  
Jian Yao ◽  
Rong-Yue Zheng
Keyword(s):  
Energy Demand ◽  
Energy Performance ◽  
Office Buildings ◽  
Climatic Regions ◽  
Energy Saving Potential ◽  
Heating And Cooling ◽  
Energy Demands ◽  
Solar Shading ◽  
Lighting Energy ◽  
Shading Devices

This paper conducted a study on the energy-saving potential of a developed thermotropic window. Office buildings in different climate regions of China were compared in terms of heating, cooling and lighting energy demands. Results show that annual heating and cooling energy demands for office buildings differ largely, while lighting energy demand at different climates keeps a significant percentage of the total energy demand, ranging from 36.1% to 66.3%. Meanwhile, thermotropic windows achieve a great advantage in improving daylighting performance and in reducing the overall energy demand, by reducing the overall energy demand by 2.27%-8.7% and 10.1%-21.72%, respectively, compared to movable shading devices and Low-E windows. This means that this kind of thermotropic windows have a great potential in applications in different climatic regions and can be considered as a good substitute of solar shading devices and Low-E windows.

scholarly journals Simple analysis of daylight saving time effects in Belgrade climate and latitude

Spatium ◽  
2018 ◽  
pp. 1-6
Author(s):  
Marija Grujic ◽  
Aleksandar Radevski
Keyword(s):  
Energy Demand ◽  
Energy Savings ◽  
Office Buildings ◽  
Negative Effects ◽  
Daylight Saving Time ◽  
Daylight Saving ◽  
Middle Latitudes ◽  
Lighting Energy ◽  
Summer Time ◽  
Clock Shift

Contemporary controversy about daylight saving time (DST) is mainly derived from different standpoints in studies investigating the positive and negative effects of the clock shift during summer period. From the standpoint of energy savings, most studies have consensus that the summertime clock shift in middle latitudes, with a large difference between winter and summer daylight hours, contributes to energy savings in buildings. Belgrade?s mid-latitude, moderate-continental climate has a six-month long heating season and a three-month cooling season. The annual domination of the heating period assumes that the demand for heating energy also dominates in the annual energy breakdown for average office buildings. Since DST covers mainly summer time, the energy breakdown in office buildings during the DST period is dominated by the energy demand for lighting and cooling. The shift of time ahead of standard time during the DST period causes a shift in temperature, daylight availability and solar energy resources and thus a shift in the potential for the utilisation of the surrounding energy. This paper investigates how the application of DST in Belgrade?s climate and latitude influences the change of climate parameters relevant for the cooling and lighting energy demand in office buildings.

A Simplified Method to Estimate Cooling Energy Savings From Night Ventilation for Office Buildings

2007 ◽  
Author(s):  
Xiang Liu ◽  
Moncef Krarti
Keyword(s):  
Energy Use ◽  
Energy Savings ◽  
Energy Performance ◽  
Office Buildings ◽  
Analysis Method ◽  
Commercial Building ◽  
Volume Rate ◽  
Ventilation Duration ◽  
Night Ventilation ◽  
Simplified Calculation

This paper provides a simplified analysis method and to evaluate the potential of night ventilation to save cooling energy for office buildings. Specifically, impacts on cooling energy performance are investigated for various combinations of night ventilation flow rates and duration periods. The analysis results indicate that an increase of ventilation duration period and volume rate leads to greater night ventilation benefits for dwellings located in Denver, CO. However, an increase of the ventilation volume rate above 5 air changes per hour has a little impact on cooling energy savings. When the ventilation period is short (less than 10 hours), and the flow rate is high (more than 3 ACH), the cooling energy savings from night ventilation increase linearly with the ventilation duration period length. A simplified calculation method has been developed based on the results of a series of parametric simulation analyses. Commercial building designers and operators can use the proposed simplified calculation tool to assess the effectiveness of night ventilation in reducing cooling energy use.

Lighting energy performance determination in office environments through implementation of EN 15193-1 for Turkey

2021 ◽  
pp. 147715352098742
Author(s):  
FŞ Yilmaz
Keyword(s):  
System Design ◽  
Architectural Design ◽  
Office Buildings ◽  
Energy Requirements ◽  
System Control ◽  
Lighting System ◽  
Artificial Lighting ◽  
Design Alternatives ◽  
Lighting Energy ◽  
The Impact

Office buildings are building typologies where efficient and optimal use of lighting energy is crucial while providing comfortable visual environments. The purpose of this study is to explore the impact of diverse architectural design alternatives on lighting energy requirements and lighting energy saving possibilities through a case study. In this study, a total of 3888 design alternatives are investigated in a comparative way in terms of daylighting system design alternatives, artificial lighting system design scenarios, artificial lighting system control types and shading system control options. Introducing the adaptation process of the EN 15193-1:2017 standard for Turkey’s specific climatic and geographical conditions and considering diverse lighting design scenarios, results of this parametric study aim to underline the significance of architectural design strategies in office buildings for the reduction of lighting energy requirements.

scholarly journals Energy and Greenhouse Gas Savings for LEED-Certified U.S. Office Buildings

Energies ◽  
2021 ◽  
Vol 14 (3) ◽  
pp. 749
Author(s):  
John H. Scofield ◽  
Susannah Brodnitz ◽  
Jakob Cornell ◽  
Tian Liang ◽  
Thomas Scofield
Keyword(s):  
Greenhouse Gas ◽  
Energy Use ◽  
Energy Savings ◽  
Electric Energy ◽  
Building Energy ◽  
Energy Performance ◽  
Office Buildings ◽  
Ghg Emission ◽  
Site Energy ◽  
New Construction

In this work, we present results from the largest study of measured, whole-building energy performance for commercial LEED-certified buildings, using 2016 energy use data that were obtained for 4417 commercial office buildings (114 million m2) from municipal energy benchmarking disclosures for 10 major U.S. cities. The properties included 551 buildings (31 million m2) that we identified as LEED-certified. Annual energy use and greenhouse gas (GHG) emission were compared between LEED and non-LEED offices on a city-by-city basis and in aggregate. In aggregate, LEED offices demonstrated 11% site energy savings but only 7% savings in source energy and GHG emission. LEED offices saved 26% in non-electric energy but demonstrated no significant savings in electric energy. LEED savings in GHG and source energy increased to 10% when compared with newer, non-LEED offices. We also compared the measured energy savings for individual buildings with their projected savings, as determined by LEED points awarded for energy optimization. This analysis uncovered minimal correlation, i.e., an R2 < 1% for New Construction (NC) and Core and Shell (CS), and 8% for Existing Euildings (EB). The total measured site energy savings for LEED-NC and LEED-CS was 11% lower than projected while the total measured source energy savings for LEED-EB was 81% lower than projected. Only LEED offices certified at the gold level demonstrated statistically significant savings in source energy and greenhouse gas emissions as compared with non-LEED offices.

scholarly journals Towards Sustainable Energy Retrofitting, a Simulation for Potential Energy Use Reduction in Residential Buildings in Palestine

Energies ◽  
2021 ◽  
Vol 14 (13) ◽  
pp. 3876
Author(s):  
Sameh Monna ◽  
Adel Juaidi ◽  
Ramez Abdallah ◽  
Aiman Albatayneh ◽  
Patrick Dutournie ◽  
...  
Keyword(s):  
Energy Consumption ◽  
Energy Use ◽  
Energy Savings ◽  
Residential Buildings ◽  
Residential Building ◽  
Simulation Models ◽  
Water Heating ◽  
Heating And Cooling ◽  
Space Cooling ◽  
Cooling Loads

Since buildings are one of the major contributors to global warming, efforts should be intensified to make them more energy-efficient, particularly existing buildings. This research intends to analyze the energy savings from a suggested retrofitting program using energy simulation for typical existing residential buildings. For the assessment of the energy retrofitting program using computer simulation, the most commonly utilized residential building types were selected. The energy consumption of those selected residential buildings was assessed, and a baseline for evaluating energy retrofitting was established. Three levels of retrofitting programs were implemented. These levels were ordered by cost, with the first level being the least costly and the third level is the most expensive. The simulation models were created for two different types of buildings in three different climatic zones in Palestine. The findings suggest that water heating, space heating, space cooling, and electric lighting are the highest energy consumers in ordinary houses. Level one measures resulted in a 19–24 percent decrease in energy consumption due to reduced heating and cooling loads. The use of a combination of levels one and two resulted in a decrease of energy consumption for heating, cooling, and lighting by 50–57%. The use of the three levels resulted in a decrease of 71–80% in total energy usage for heating, cooling, lighting, water heating, and air conditioning.

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