scholarly journals KINERJA TERMAL SELUBUNG GEDUNG KULIAH KOTA BANDAR LAMPUNG ITERA

2019 ◽  
Vol 3 (3) ◽  
pp. 267
Author(s):  
Andi Asrul Sani ◽  
Adelia Enjelina Matondang ◽  
Guruh Kristiadi Kurniawan ◽  
Anggi Mardiyanto
Keyword(s):  
Heat Transfer ◽  
Energy Consumption ◽  
Building Energy ◽  
Air Conditioner ◽  
Tropical Country ◽  
Air Conditioners ◽  
Natural Lighting ◽  
Thermal Transfer ◽  
Institute Of Technology ◽  
Window Area

Abstract: The use of glass material should consider the comfort of space in the building. Field of glass is needed as natural lighting and visual facilities between the occupants and the surrounding environment. Its function as natural lighting is often accompanied by an increase in temperature in buildings, considering that Indonesia is a tropical country. Building temperatures that increase due to incoming sunlight can cause discomfort to building occupants. Such conditions make building occupants use air conditioner (AC). The use of air conditioners can increase the value of building energy consumption. For this reason, research on the value of heat transfer in buildings or the value of OTTV (Overall Thermal Transfer Value). OTTV value calculation is done by manual calculation. Bandar Lampung City lecture building at the Sumatra Institute of Technology was chosen as the object of this study. From the results of the study found that the value of heat transfer of a building or OTTV (Overall Thermal Transfer Value) is influenced by the factor of the ratio of the window area to the facade or WWR (Window Wall Ratio) and the shading factor (Shading Coefficient).(Keywords: Keyword: energy consumption, building energy, glass. Abstract: Penggunaan material kaca semestinya mempertimbangkan kenyamanan ruang dalam bangunan. Bidang kaca diperlukan sebagai pencahayaan alami dan sarana visual antara penghuni dan lingkungan sekitar. Fungsinya sebagai pencahayaan alami seringkali disertai dengan peningkatan temperatur pada bangunan, mengingat Indonesia merupakan negara yang beriklim tropis. Temperatur bangunan yang meningkat akibat dari radiasi sinar matahari yang masuk dapat menyebabkan ketidaknyamanan bagi penghuni bangunan. Kondisi seperti itu membuat penghuni bangunan menggunakan air conditioner (AC). Penggunaan air conditioner tersebut dapat meningkatkan nilai konsumsi energi bangunan. Untuk  itu dilakukan penelitian mengenai nilai perpindahan panas dalam bangunan atau nilai OTTV (Overall Thermal Transfer Value). Penghitungan nilai OTTV dilakukan dengan penghitungan manual. Gedung kuliah Kota Bandar Lampung di Institut Teknologi Sumatera di pilih sebagai objek dalam penelitian ini. Dari hasil penelitian ditemukan bahwa nilai perpindahan panas suatu bangunan atau OTTV (Overall Thermal Transfer Value) dipengaruhi oleh faktor nilai perbandingan luas jendela terhadap bidang fasad atau WWR (Window Wall Ratio) dan faktor pembayangan (Shading Coefficient).Kata kunci : konsumsi energi, energi bangunan, kaca.

A Field Survey of Occupancy and Air-Conditioner Use Patterns in Open Plan Offices

2010 ◽  
Vol 20 (1) ◽  
pp. 137-147 ◽  
Author(s):  
Geun Young Yun ◽  
Hyo Joo Kong ◽  
Jeong Tai Kim
Keyword(s):  
Energy Consumption ◽  
Building Energy ◽  
Air Cooling ◽  
Air Conditioner ◽  
Air Conditioners ◽  
Use Patterns ◽  
Building Management ◽  
Simulation Based ◽  
Open Plan ◽  
Survey Results

This paper reports the survey results from a field monitoring study of office occupancy and air-conditioner use pattern of an office building in Seoul, Korea, from 20 July to 29 September 2009. The survey has an aim to reveal the relationship between the indoor environment conditions and occupancy; and the use patterns of air-conditioners and energy consumption in offices. The results showed that the average occupied time of the investigated offices was 15.48 h per day for normal weekdays, which was longer than expected occupancy schedules assumed for offices for the design prediction of building energy consumption. This study also presents the hourly profiles of air-conditioner use and evaluates the effect of longer occupancy period on energy consumption for air cooling in open-plan offices in Korea. The findings of this study could contribute to inform building energy simulation based on realistic office occupancy profile provided by the survey, which would therefore inform better operation of air-conditioners and more efficient use of energy in building management.

Dehumidification Strategies to Improve Energy Use at Retailers: A Case Study of a Supermarket Located in Guayaquil, Ecuador

2020 ◽  
Author(s):  
Jaqueline Litardo ◽  
Rubén Hidalgo-León ◽  
Paul Coronel ◽  
Andrea Damian ◽  
José Macías ◽  
...  
Keyword(s):  
Energy Consumption ◽  
Energy Use ◽  
Building Energy ◽  
Energy Performance ◽  
Air Conditioner ◽  
Baseline Model ◽  
Air Conditioners ◽  
Frozen Food ◽  
Desiccant Wheel

Abstract This study aims to model and evaluate the energy performance of a supermarket located in Guayaquil, Ecuador. For this purpose, we modeled the baseline of the supermarket using EnergyPlus software. All input parameters used in the simulations were provided by the supermarket staff. Air-conditioners and refrigerated cases were modeled using the default templates in EnergyPlus but replacing the specifications of the site systems. The baseline model predicted, within ±10%, the energy consumption of the case study when compared to the real electricity bills of the building. Then, we incorporated a desiccant wheel for each of the air-conditioner units that supply the frozen food area. Results showed relevant reductions of about 52% in cooling energy by decreasing the humidity level from 70% to 40% with the use of desiccant systems. However, the introduction of these systems increased the total building energy consumption by about 3% due to the regeneration process.

scholarly journals Study on energy loss and thermal environment through door open while air conditioner running

2019 ◽  
Vol 111 ◽  
pp. 06035
Author(s):  
Sihwan Lee
Keyword(s):  
Energy Consumption ◽  
Indoor Air ◽  
Room Temperature ◽  
Thermal Environment ◽  
Infiltration Rate ◽  
Operating Efficiency ◽  
Air Conditioner ◽  
Air Conditioners ◽  
Cooling Period ◽  
Closed State

While air conditioner is running, opening doors and windows is a great way to reduce operating efficiency and undermine the air conditioning system’s ability to bring the indoor to a comfortable temperature. The purpose of this study is to evaluate the heat loss and thermal environment through the door open while air conditioner running. To achieve this goal, using full-scale measurement with the commercial store during the cooling period, the infiltration rate, thermal environment and energy consumption of air conditioners with door opened and door closed state were measured. The measured results show that the infiltration rate at the door opened state was increased by about 21.3 times compared to the door closed state. When the set temperature of the air conditioner was 24 °C, the room temperature in the opening gate cooling was measured to be about 5 °C higher than the closing gate cooling. However, the energy consumption was measured approximately 12 kWh/day and there was no difference with door state. This means that the energy consumption is not increased if the indoor air temperature would not reach the set point temperature of air conditioner.

Performance Enhancement of Air Cooled Heat Sink Used in Inverter Drives of Residential Air Conditioners

2020 ◽  
Vol 28 (01) ◽  
pp. 2050008
Author(s):  
Vignesh Lakshmanan ◽  
Pushpak Doiphode ◽  
Indraneel Samanta
Keyword(s):  
Heat Transfer ◽  
Thermal Performance ◽  
Heat Sink ◽  
Performance Enhancement ◽  
Air Conditioner ◽  
Electronic Components ◽  
Variable Frequency Drive ◽  
Air Conditioners ◽  
Baseline Case ◽  
Heating Load

Inverter air conditioners are being widely used in the air conditioning sector for energy saving purposes. These air conditioners use an inverter or a variable frequency drive (VFD) to control the compressor operating speed based on cooling or heating load fluctuations. If the heat generated by the electronic components of the VFD is not dissipated properly, it can lead to failure of the VFD. In general, a heat sink is used for dissipating the heat generated by the electronic components of the VFD. The heat sink can be either air cooled or liquid cooled. Using computational fluid dynamics (CFD), this paper deals with optimization of the thermal performance of an air cooled plate-fin heat sink with rectangular fins used in a residential split inverter air conditioner. Commercially available CFD tool has been used for simulations. It has been observed that enhancing fluid flow around the heat sink and improving heat transfer area of the fins significantly improve the thermal performance of the heat sink. By using heat sink with rectangular fins having a stepped profile, it has been possible to improve the heat transfer from the baseline case by 27%. Whereas, by using hollow fins, heat transfer improvement of 20% has been achieved.

Study of Exterior Window’s Energy-Saving Design for the Residential Buildings in Severe Cold Region

2012 ◽  
Vol 598 ◽  
pp. 49-52
Author(s):  
Hong Tao Zhou
Keyword(s):  
Heat Transfer ◽  
Energy Consumption ◽  
Residential Buildings ◽  
Thermal Conditions ◽  
Building Energy ◽  
Cold Region ◽  
Inner Surface ◽  
Reduce Energy Consumption ◽  
Window Design ◽  
The Heat Transfer Coefficient

Measure the temperature of exterior window and surrounding walls’ inner surface, and measure interior air temperature to analyze the effect, which was brought to building energy consumption and interior thermal conditions by the exterior window of the building; studied several details of exterior window design, and proposes a method, which is separately controlling the heat-transfer coefficient according to different orientation, room’s positions and room’s functions while designing the exterior windows, in order to improve the interior thermal conditions and reduce energy consumption of the residential buildings.

Continuous Monitoring, Modeling, and Evaluation of Actual Building Energy Systems

2014 ◽  
Author(s):  
Maxim L. Sankey ◽  
Sheldon M. Jeter ◽  
Trevor D. Wolf ◽  
Donald P. Alexander ◽  
Gregory M. Spiro ◽  
...  
Keyword(s):  
Energy Consumption ◽  
Real Time ◽  
Continuous Monitoring ◽  
Energy System ◽  
Building Energy ◽  
Energy Performance ◽  
Weather Data ◽  
Practical Procedure ◽  
Heating And Cooling ◽  
Institute Of Technology

Residential and commercial buildings account for more than 40% of U.S. energy consumption, most of which is related to heating, ventilation and air conditioning (HVAC). Consequently, energy conservation is important to building owners and to the economy generally. In this paper we describe a process under development to continuously evaluate a building’s heating and cooling energy performance in near real-time with a procedure we call Continuous Monitoring, Modeling, and Evaluation (CMME). The concept of CMME is to model the expected operation of a building energy system with actual weather and internal load data and then compare modeled energy consumption with actual energy consumption. For this paper we modeled two buildings on the Georgia Institute of Technology campus. After creating our building models, internal lighting loads and equipment plug-loads were collected through electrical sub-metering, while the building occupancy load was recorded using doorway mounted people counters. We also collected on site weather and solar radiation data. All internal loads were input into the models and simulated with the actual weather data. We evaluated the building’s overall performance by comparing the modeled heating and cooling energy consumption with the building’s actual heating and cooling energy consumption. Our results demonstrated generally acceptable energy performance for both buildings; nevertheless, certain specific energy inefficiencies were discovered and corrective actions are being taken. This experience shows that CMME is a practical procedure for improving the performance of actual well performing buildings. With improved techniques, we believe the CMME procedure could be fully automated and notify building owners in real-time of sub-optimal building performance.

scholarly journals Assessing cooling energy of insulated building built in tropical country

2021 ◽  
Vol 881 (1) ◽  
pp. 012016
Author(s):  
R C P Sigalingging
Keyword(s):  
Global Warming ◽  
Energy Consumption ◽  
Thermal Comfort ◽  
Air Conditioner ◽  
Total Energy Consumption ◽  
Tropical Country ◽  
Fossil Energy ◽  
Global Concern ◽  
Building Practice ◽  
Fossil Fuel Energy

Abstract Global warming is a huge issue and has become a global concern lately. The global warming issue is gaining more attention on reducing fossil energy since fossil energy has significantly exacerbated global warming. Since housing sectors are consuming significant fossil fuel energy, reducing housing energy consumption is necessary. One option discussed in this paper is to reduce the load on the air conditioner (AC) by applying insulation to the building. Reducing the AC energy will reduce the total energy consumption in the buildings. Building practice in a mild climate has shown that good insulation can reduce heating or cooling energy in the building. But using insulation in housing is not a common practice in Indonesia’s construction sectors. Simulating the use of insulation in housing will show how much energy reduction will be obtained, especially for air conditioning energy. The analysis in this study found that thermal comfort is related to air temperature and relative humidity in the room. This article will study the reliability of using insulation in buildings to reduce energy consumption and provide thermal comfort for the occupant.

scholarly journals Comparison of energy consumption between non-inverter and inverter-type air conditioner in Saudi Arabia

2020 ◽  
Author(s):  
Ahmed Almogbel ◽  
Fahad Alkasmoul ◽  
Zaid Aldawsari ◽  
Jaber Alsulami ◽  
Ahmed Alsuwailem
Keyword(s):  
Saudi Arabia ◽  
Energy Consumption ◽  
Air Conditioning ◽  
High Growth ◽  
Operating Conditions ◽  
Air Conditioner ◽  
Air Conditioners ◽  
Air Conditioning Systems ◽  
Electrical Consumption ◽  
Day By Day

AbstractInterest for air-conditioning systems (ACs) has exponentially expanded worldwide throughout the most recent couple of decades. Countries with booming economies including Saudi Arabia report high growth of sales of room air conditioners. With the expanded (GDP) and warming climates, interest for room air-conditioning systems is required to additionally increment. Meeting the expanded need for electricity energy will be a challenge. Expanded utilization of energy-efficient air conditioners impactsly affects lowering the electricity demand. In an ordinary AC, the blower runs at a fixed speed and is either ON or OFF. In an inverter AC, the compressor is consistently on; however, power drawn relies upon the demand for cooling. The speed of the compressor is adjusted appropriately. In this paper, the energy consumption of non-inverter and an inverter AC of the same capacity was assessed in an average office room, under comparative operating conditions, to find the differences in the energy saving, Carbon Dioxide (CO2) emission, and power consumption of air conditioner. Energy consumption was measured for about 108 days, which is from July 16th to October 31st, 24/7, and compared. The experiment is conducted with the same conditions and same capacity air conditioners (18,000 BTU). Results show that the day-by-day normal vitality utilization, the inverter will save up to 44% of electrical consumption compared to a non-inverter of 3471 kWh/year and 6230 kWh/year respectively. Furthermore, the Total Equivalent Warming Impact (TEWI) analysis shows that inverters can save 49% of CO2 emissions.

Using Vertical Green as Material for Complying Building Energy Code

2012 ◽  
Vol 622-623 ◽  
pp. 1035-1038 ◽  
Author(s):  
Kaweewat Sathien ◽  
Kuaanan Techato ◽  
Juntakan Taweekun
Keyword(s):  
Energy Saving ◽  
Construction Material ◽  
Building Energy ◽  
Building Envelope ◽  
Air Conditioner ◽  
Thermal Transfer ◽  
Plant Utilization ◽  
Energy Codes ◽  
Building Energy Codes

Plant utilization as a part of building envelope has never been introduced in view of the compliance to Building Energy Code or the successful building energy codes or even in view of energy for building labeling. This research tries to find out the approach to utilize the equivalent plant conductivity (ke) in order to make the plant as a construction material for the building envelope. The ke is plugged into the formula of the Overall Thermal Transfer Value to see the energy saving for air-condition from having vertical green. By testing on two rooms with air conditioner, one with vertical green and another is without vertical green, the room with vertical green reduced the Overall Thermal Transfer Value from 59.87 W/m2 to 49.39 W/m2.

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