Effect of Existing Façade’s Construction and Orientation on the Performance of Low-E-Based Retrofit Double Glazing in Tropical Climate

This paper investigates the effect of an existing façade’s construction (viz. clear/grey/solar film, with and without external shade) and orientation on the performance of low-e (hard coat)-based retrofit double glazing in a tropical climate. The performance of double-glazed façades is characterized by the ability to reduce solar heat gain and the consequent reduction in power consumption of air-conditioning systems. This study involves a real-life test-bedding of a low-e (hard coat)-based retrofit double-glazing façade for a few specific cases—clear glass southeast façade without shade, clear glass southwest façade with external shade, and northwest façade with solar film and external shade. Subsequently, energy modelling simulations were done to analyze other scenarios involving various combinations of façade orientation (north, south, west, and east) and façade material (clear glass, tinted grey glass, clear glass with solar film) with and without external sunshades. The east/west-facing façades had a higher impact on the retrofit solution, and more so when the existing façade was of tinted glass or with solar film. For the case analyzed, with a window-to-wall ratio of 8% (based on overall building envelope), a grey tinted east-facing façade could benefit from annual average HVAC energy savings of up to 5.9%.

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An Investigation of Microclimatic Impact of Cool Coating for Buildings in Low-Latitude and Tropical Climate

Volume 6A: Energy ◽

10.1115/imece2014-39739 ◽

2014 ◽

Author(s):

Kishor T. Zingre ◽

Xingguo Yang ◽

Man Pun Wan

Keyword(s):

Computational Models ◽

Energy Savings ◽

Computational Study ◽

Industrial Area ◽

Tropical Climate ◽

Building Envelope ◽

Low Latitude ◽

Volume Method ◽

Technological University ◽

The Impact

This study investigates the impact of cool coating on air-conditioning energy savings and micro-climate of buildings in low-latitude and tropical climate by performing a computational study. The computational study was carried out using Integrated Environmental Solutions (IES) software which is plugged in with Computational Fluid Dynamics (CFD) program [1]. IES simulations (which uses the heat balance equations at building envelope surfaces and in indoor environment) were performed to investigate the roof surface temperature, while CFD simulations (which uses the Finite Volume Method) were performed to investigate the impact on micro-climate above a real-size single storey air-conditioned building. The computational models in the software were validated by comparing the simulations results against the experimental results obtained from the test building in the industrial area of Nanyang Technological University (NTU), Singapore. Results showed that by applying a cool coating having solar reflectivity of 0.8 on the concrete roof with original solar reflectivity of 0.27, the surface temperatures of roof and ceiling can be reduced by up to 17.5°C and 1.2°C respectively in an air-conditioned room maintain at 22°C. In addition, after applying this high solar reflectance coating, a maximum reduction of 1.0°C, 0.7°C and 0.6°C for air temperature at a height of 0.5 m, 1 m and 1.5 m above the roof surface could be achieved.

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Evaluation of a High-Performance Solar Home in Loveland, Colorado

Journal of Solar Energy Engineering ◽

10.1115/1.2710248 ◽

2006 ◽

Vol 129 (2) ◽

pp. 226-234

Author(s):

Robert Hendron ◽

Mark Eastment ◽

Ed Hancock ◽

Greg Barker ◽

Paul Reeves

Keyword(s):

High Performance ◽

Energy Savings ◽

High Efficiency ◽

Building Envelope ◽

Operating Conditions ◽

Hot Water ◽

Space Heating ◽

Solar Water Heater ◽

Water Heater ◽

Solar Water

Building America (BA) partner McStain Neighborhoods built the Discovery House in Loveland, CO, with an extensive package of energy-efficient features, including a high-performance envelope, efficient mechanical systems, a solar water heater integrated with the space-heating system, a heat-recovery ventilator (HRV), and ENERGY STAR appliances. The National Renewable Energy Laboratory (NREL) and Building Science Consortium conducted short-term field-testing and building energy simulations to evaluate the performance of the house. These evaluations are utilized by BA to improve future prototype designs and to identify critical research needs. The Discovery House building envelope and ducts were very tight under normal operating conditions. The HRV provided fresh air at a rate of about 35L∕s(75cfm), consistent with the recommendations of ASHRAE Standard 62.2. The solar hot water system is expected to meet the bulk of the domestic hot water (DHW) load (>83%), but only about 12% of the space-heating load. DOE-2.2 simulations predict whole-house source energy savings of 54% compared to the BA Benchmark (Hendron, R., 2005 NREL Report No. 37529, NREL, Golden, CO). The largest contributors to energy savings beyond McStain’s standard practice are the solar water heater, HRV, improved air distribution, high-efficiency boiler, and compact fluorescent lighting package.

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The Role of Wind on Double Skin Facades in High Rise Office Building

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.787.711 ◽

2013 ◽

Vol 787 ◽

pp. 711-716

Author(s):

Daryanto ◽

Eko Budihardjo ◽

Wahyu Setyabudi ◽

Gagoek Hardiman

Keyword(s):

Energy Conservation ◽

Building Envelope ◽

Office Buildings ◽

Thermal Discomfort ◽

High Rise ◽

Double Skin ◽

The Subject ◽

Air Conditioning Systems ◽

Double Skin Facades

There was an indication that high rise buildings in Jakarta was not designed based on energy conservation principles. The most important aspects of the high-rise buildings is energy saving technology located in the building envelope design. Building envelope with a full glass design functions for widening view and enhancing natural lights, even though but it is also increasing energy consumption and thermal discomfort due to the intensity of solar radiation in hot humid climates. During the current decade, the development of double building envelope type (Double Skin Façade: DSF) seemed more just to improve the aesthetics and the use of natural light, while the wind and thermal performance aspects were still lack of serious consideration. Those aspects will be chosen as the subject matter in this research. The research was aimed to investigate and compare the value of heat transfer in the building envelope of high-rise office buildings. Samples were taken from five DSF buildings, with closed and open cavity. CFD software is used for simulation of the five different models of DSF. The research proves that the high-rise office buildings as the research object in Jakarta do not apply energy conservation principle. The utilization of wind in the DSF cavity can reduce temperature and relieve the burden of air conditioning systems that is energy save. An important finding of the research is the need for ventilation in the design of a double skin at high-rise office buildings in the humid tropics.

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Pulsed LED-Lighting as an Alternative Energy Savings Technique for Vertical Farms and Plant Factories

Energies ◽

10.3390/en14061603 ◽

2021 ◽

Vol 14 (6) ◽

pp. 1603

Author(s):

Ernesto Olvera-Gonzalez ◽

Nivia Escalante-Garcia ◽

Deland Myers ◽

Peter Ampim ◽

Eric Obeng ◽

...

Keyword(s):

Energy Consumption ◽

Alternative Energy ◽

Energy Savings ◽

Production Systems ◽

Real Life ◽

Plant Production ◽

Photon Flux ◽

Photon Flux Density ◽

Led Light ◽

Operation Modes

Different strategies are reported in the literature for energy saving in Closed Plant Production Systems (CPPS). However, not reliable evidences about energy consumption with the use of pulsed LED light technique in lighting system available in Plant Factory and Vertical Farm. In this work, three key points to determine the effects of pulsed LED light versus continuous LED light are presented: (1) A mathematical model and its practical application for stabilizing the energy equivalence using LED light in continuous and pulsed mode in different light treatments. (2) The quantum efficiency of the photosystem II was used to determine positive and/or negative effects of the light operating mode (continuous or pulsed) on chili pepper plants (Capsicum annuum var. Serrano). (3) Evaluation of energy consumption with both operation modes using ten recipes from the literature to grow plants applied in Closed Plant Production Systems, different Photosynthetic Photon Flux Density at 50, 110, and 180 µmol m−2 s−1, Frequencies at 100, 500, and 1000 Hz, and Duty Cycles of 40, 50, 60, 70, 80, and 90%. The results show no significant statistical differences between the operation modes (continuous and pulsed LED light). For each light recipe analyzed, a pulsed frequency and a duty cycle were obtained, achieving significant energy savings in every light intensity. The results can be useful guide for real-life applications in CPPS.

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BIM and BEM Methodologies Integration in Energy-Efficient Buildings Using Experimental Design

Buildings ◽

10.3390/buildings11100491 ◽

2021 ◽

Vol 11 (10) ◽

pp. 491

Author(s):

Jorge González ◽

Carlos Alberto Pereira Soares ◽

Mohammad Najjar ◽

Assed N. Haddad

Keyword(s):

Experimental Design ◽

Energy Efficient ◽

Thermal Characteristics ◽

Energy Performance ◽

Building Envelope ◽

Climatic Zones ◽

Energy Efficient Buildings ◽

Energy Modelling ◽

Building Information ◽

Energetic Performance

Linking Building Information Modelling and Building Energy Modelling methodologies appear as a tool for the energy performance analysis of a dwelling, being able to build the physical model via Autodesk Revit and simulating the energy modeling with its complement Autodesk Insight. A residential two-story house was evaluated in five different locations within distinct climatic zones to reduce its electricity demand. Experimental Design is used as a methodological tool to define the possible arrangement of results emitted via Autodesk Insight that exhibits the minor electric demand, considering three variables: Lighting efficiency, Plug-Load Efficiency, and HVAC systems. The analysis concluded that while the higher the efficiency of lighting and applications, the lower the electric demand. In addition, the type of climate and thermal characteristics of the materials that conform to the building envelope have significant effects on the energetic performance. The adjustment of different energetic measures and its comparison with other climatic zones enable decision-makers to choose the best combination of variables for developing strategies to lower the electric demand towards energy-efficient buildings.

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DEVELOPMENT OF A NEW CO2-BASED DEMAND-CONTROLLED VENTILATION STRATEGY USING ENERGYPLUS

10.31224/osf.io/h6mdn ◽

2017 ◽

Author(s):

Behrang Chenari ◽

Francisco Bispo Lamas ◽

Adélio Rodrigues Gaspar ◽

Manuel Gameiro da Silva

Keyword(s):

Energy Efficiency ◽

Indoor Air ◽

Energy Use ◽

Energy Savings ◽

Environmental Condition ◽

Ventilation Strategy ◽

Controlled Ventilation ◽

New Strategy ◽

Demand Controlled Ventilation ◽

Air Conditioning Systems

A significant amount of energy is being used by ventilation and air conditioning systems to maintain the indoor environmental condition in a satisfactory and comfortable level. Many buildings, either new or existing (throughout their renovation process) are subjected to energy efficiency requirements but these must not be in the expenses of indoor environmental conditions. For instance, indoor air quality (IAQ) has to be considered while improving energy efficiency, otherwise occupants might be exposed to inappropriate indoor environment.Demand-controlled ventilation (DCV) is a method that provides comfortable IAQ level with lowest energy use. In this paper, the main objective is developing a new CO2-based DCV strategy and simulating it using EnergyPlus. The IAQ and energy consumption associated to this strategy have been compared with the results of CO2-based DCV strategies previously developed by the same authors in another article. The comparison shows that the new strategy performs better, both in energy use and IAQ. The recorded energy savings ranged between 6-14% comparing with the previously developed strategies while IAQ slightly improved.

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Evaluation of a High-Performance Solar Home in Loveland, Colorado

Solar Energy ◽

10.1115/isec2005-76231 ◽

2005 ◽

Cited By ~ 1

Author(s):

Robert Hendron ◽

Mark Eastment ◽

Ed Hancock ◽

Greg Barker ◽

Paul Reeves

Keyword(s):

High Performance ◽

Energy Savings ◽

High Efficiency ◽

Building Envelope ◽

Operating Conditions ◽

Hot Water ◽

Space Heating ◽

Solar Water Heater ◽

Water Heater ◽

Solar Water

Building America (BA) partner McStain Neighborhoods built the Discovery House in Loveland, Colorado, with an extensive package of energy-efficient features, including a high-performance envelope, efficient mechanical systems, a solar water heater integrated with the space-heating system, a heat-recovery ventilator (HRV), and ENERGY STAR™ appliances. The National Renewable Energy Laboratory (NREL) and Building Science Consortium (BSC) conducted short-term field-testing and building energy simulations to evaluate the performance of the house. These evaluations are utilized by BA to improve future prototype designs and to identify critical research needs. The Discovery House building envelope and ducts were very tight under normal operating conditions. The HRV provided fresh air at a rate of about 75 cfm (35 l/s), consistent with the recommendations of ASHRAE Standard 62.2. The solar hot water system is expected to meet the bulk of the domestic hot water (DHW) load (>83%), but only about 12% of the space-heating load. DOE-2.2 simulations predict whole-house source energy savings of 54% compared to the BA Benchmark [1]. The largest contributors to energy savings beyond McStain’s standard practice are the solar water heater, HRV, improved air distribution, high-efficiency boiler, and compact fluorescent lighting package.

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Determination of Optimum Envelope of Religious Buildings in Terms of Thermal Comfort and Energy Consumption: Mosque Cases

Energies ◽

10.3390/en14206597 ◽

2021 ◽

Vol 14 (20) ◽

pp. 6597

Author(s):

Ahmet Bircan Atmaca ◽

Gülay Zorer Gedik ◽

Andreas Wagner

Keyword(s):

Thermal Properties ◽

Energy Consumption ◽

Thermal Comfort ◽

Thermal Insulation ◽

Energy Savings ◽

Gain Factor ◽

Building Envelope ◽

Comfort Level ◽

Humid Climate ◽

Savings Rate

Mosques are quite different from other building types in terms of occupant type and usage schedule. For this reason, they should be evaluated differently from other building types in terms of thermal comfort and energy consumption. It is difficult and probably not even necessary to create homogeneous thermal comfort in mosques’ entire usage area, which has large volumes and various areas for different activities. Nevertheless, energy consumption should be at a minimum level. In order to ensure that mosques are minimally affected by outdoor climatic changes, the improvement of the properties of the building envelope should have the highest priority. These optimal properties of the building envelope have to be in line with thermal comfort in mosques. The proposed method will be a guide for designers and occupants in the design process of new mosques or the use of existing mosques. The effect of the thermal properties of the building envelope on energy consumption was investigated to ensure optimum energy consumption together with an acceptable thermal comfort level. For this purpose, a parametric simulation study of the mosques was conducted by varying optical and thermal properties of the building envelope for a temperature humid climate zone. The simulation results were analyzed and evaluated according to current standards, and an appropriate envelope was determined. The results show that thermal insulation improvements in the roof dome of buildings with a large volume contributed more to energy savings than in walls and foundations. The use of double or triple glazing in transparent areas is an issue that should be considered together with the solar energy gain factor. Additionally, an increasing thickness of thermal insulation in the building envelope contributed positively to energy savings. However, the energy savings rate decreased after a certain thickness. The proposed building envelope achieved a 33% energy savings compared to the base scenario.

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