scholarly journals Efektifitas fasad selubung ganda dalam mengurangi beban panas pada dinding luar bangunan

2017 ◽  
Vol 6 (1) ◽  
pp. 70-75
Author(s):  
Rosady Mulyadi
Keyword(s):  
Total Load ◽  
Exhaust Heat ◽  
U Value ◽  
Heat Data

Penelitian ini adalah penelitian eksperimental melalui simulasi numerik berbantuan komputer untuk mengetahui efektifitas fasad selubung ganda dalam mengurangi beban panas pada dinding luar. Model fasad selubung ganda yang digunakan terdiri atas selubung luar, selubung dalam, elemen peneduh, bukaan bawah dan bukaan atas sebagai gerbang masuk dan keluarnya udara melalui rongga udara yang tercipta antara selubung luar dan selubung dalam. Simulasi dilakukan untuk mendapatkan data temperatur pada rongga selubung, temperatur kaca, temperatur elemen peneduh, transfer panas radiasi, transmittansi termal, dan jumlah exhaust-heat. Data tersebut digunakan untuk menghitung besaran u-value dan SC dari fasad selubung ganda. Hasil perhitungan besaran beban panas dengan MicroHASP/TES menunjukkan bahwa lebih dari 57.7% dari beban panas pada zona perimeter di waktu puncak dapat direduksi pada selubung barat dan timur. Sebanyak 11% dari total load dapat direduksi jika dibandingkan dengan fasad kaca tunggal 8mm dan 10% dari total load dapat dikurangi jika dibandingkan dengan fasad kaca ganda 6mm.

Workload Perception of Air Traffic Control Officers and Pilots During Continuous Descent Operations Approach Procedures

2019 ◽  
Vol 9 (1) ◽  
pp. 2-11
Author(s):  
Marina Efthymiou ◽  
Frank Fichert ◽  
Olaf Lantzsch
Keyword(s):  
Fuel Consumption ◽  
Traffic Control ◽  
Air Traffic Control ◽  
Negative Impact ◽  
Air Traffic ◽  
Reduce Fuel Consumption ◽  
Total Load ◽  
Open Path

Abstract. The paper examines the workload perceived by air traffic control officers (ATCOs) and pilots during continuous descent operations (CDOs), applying closed- and open-path procedures. CDOs reduce fuel consumption and noise emissions. Therefore, they are supported by airports as well as airlines. However, their use often depends on pilots asking for CDOs and controllers giving approval and directions. An adapted NASA Total Load Index (TLX) was used to measure the workload perception of ATCOs and pilots when applying CDOs at selected European airports. The main finding is that ATCOs’ workload increased when giving both closed- and open-path CDOs, which may have a negative impact on their willingness to apply CDOs. The main problem reported by pilots was insufficient distance-to-go information provided by ATCOs. The workload change is important when considering the use of CDOs.

Impact of roof shading on building energy performance in warm & humid climatic places of India

2020 ◽  
pp. 50-64
Author(s):  
Kuladeep Kumar Sadevi ◽  
Avlokita Agrawal
Keyword(s):  
Energy Consumption ◽  
Energy Conservation ◽  
Energy Performance ◽  
General Assumption ◽  
Climatic Conditions ◽  
Building Envelope ◽  
Passive Cooling ◽  
Base Case ◽  
U Value ◽  
The Impact

With the rise in awareness of energy efficient buildings and adoption of mandatory energy conservation codes across the globe, significant change is being observed in the way the buildings are designed. With the launch of Energy Conservation Building Code (ECBC) in India, climate responsive designs and passive cooling techniques are being explored increasingly in building designs. Of all the building envelope components, roof surface has been identified as the most significant with respect to the heat gain due to the incident solar radiation on buildings, especially in tropical climatic conditions. Since ECBC specifies stringent U-Values for roof assembly, use of insulating materials is becoming popular. Along with insulation, the shading of the roof is also observed to be an important strategy for improving thermal performance of the building, especially in Warm and humid climatic conditions. This study intends to assess the impact of roof shading on building’s energy performance in comparison to that of exposed roof with insulation. A typical office building with specific geometry and schedules has been identified as base case model for this study. This building is simulated using energy modelling software ‘Design Builder’ with base case parameters as prescribed in ECBC. Further, the same building has been simulated parametrically adjusting the amount of roof insulation and roof shading simultaneously. The overall energy consumption and the envelope performance of the top floor are extracted for analysis. The results indicate that the roof shading is an effective passive cooling strategy for both naturally ventilated and air conditioned buildings in Warm and humid climates of India. It is also observed that a fully shaded roof outperforms the insulated roof as per ECBC prescription. Provision of shading over roof reduces the annual energy consumption of building in case of both insulated and uninsulated roofs. However, the impact is higher for uninsulated roofs (U-Value of 3.933 W/m2K), being 4.18% as compared to 0.59% for insulated roofs (U-Value of 0.33 W/m2K).While the general assumption is that roof insulation helps in reducing the energy consumption in tropical buildings, it is observed to be the other way when insulation is provided with roof shading. It is due to restricted heat loss during night.

Lake Superior Atmospheric Wet Deposition 1980-1983

1987 ◽  
Vol 22 (3) ◽  
pp. 365-376
Author(s):  
C. H. Chan ◽  
L. H. Perkins
Keyword(s):  
Atmospheric Deposition ◽  
Wet Deposition ◽  
Major Ions ◽  
Lake Superior ◽  
Relative Accuracy ◽  
Lake Chemistry ◽  
Total Load ◽  
Wet Precipitation ◽  
Percentage Basis ◽  
Nitrogen Loadings

Abstract Wet deposition estimates were computed from monthly wet precipitation samples collected in the Lake Superior Basin. Sulphate and nitrogen loadings from wet precipitation corresponded to 142 and 40 thousand tonnes per year. On a percentage basis, wet deposition of sulphate and nitrogen accounted for 21% and 54%, respectively, of the total load. Atmospheric sources for other major ions ranged from 1 to 10%. Atmospheric deposition at the eastern end of Lake Superior was higher than the western end of the Basin. The relative accuracy of these estimates were examined in relation to the changes in lake chemistry in Lake Superior from 1973 to 1983.

Full Cycle Energy Recovery from Incinerator Exhaust – Heat When You Need It, Electricity When You Don’t

2015 ◽  
Vol 2015 (13) ◽  
pp. 190-194
Author(s):  
Eric Auerbach ◽  
Rob Ostapczuk ◽  
David Comerford ◽  
Michael Letina
Keyword(s):  
Energy Recovery ◽  
Exhaust Heat
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