scholarly journals Green Building Concept Application with VRF Air Conditioning System

2021 ◽  
Author(s):  
Herman Soegoto ◽  
Keyword(s):  
Air Conditioning ◽  
Research Method ◽  
Electrical Power ◽  
Green Building ◽  
Air Conditioning System ◽  
Monthly Cost ◽  
Space Efficiency ◽  
Aesthetic Appearance ◽  
Research Findings ◽  
Concept Application

The objective of this research is to find out the benefit of the Green Building Concept application with VRF Air Conditioning System at Indonesian Computer University. The research method used is descriptive quantitative analysis. Based on research findings, the VRF air conditioning system in Indonesian Computer University could reduce electrical power usage and the monthly cost for electrical power. However, the payback can only be reached after 15 years of operation. The other benefits are the space efficiency for more flexible placement of the outdoor unit and did not decrease the building's aesthetic appearance.

scholarly journals A New Design of an Integrated Solar Absorption Cooling System Driven by an Evacuated Tube Collector: A Case Study for Baghdad, Iraq

2020 ◽  
Vol 10 (10) ◽  
pp. 3622 ◽  
Author(s):  
Adil Al-Falahi ◽  
Falah Alobaid ◽  
Bernd Epple
Keyword(s):  
Thermal Performance ◽  
Air Conditioning ◽  
Cooling System ◽  
Electrical Power ◽  
Energy Performance ◽  
Coefficient Of Performance ◽  
Solar Absorption ◽  
Air Conditioning System ◽  
Solar Fraction ◽  
Design Variables

The electrical power consumption of refrigeration equipment leads to a significant influence on the supply network, especially on the hottest days during the cooling season (and this is besides the conventional electricity problem in Iraq). The aim of this work is to investigate the energy performance of a solar-driven air-conditioning system utilizing absorption technology under climate in Baghdad, Iraq. The solar fraction and the thermal performance of the solar air-conditioning system were analyzed for various months in the cooling season. It was found that the system operating in August shows the best monthly average solar fraction (of 59.4%) and coefficient of performance (COP) (of 0.52) due to the high solar potential in this month. Moreover, the seasonal integrated collector efficiency was 54%, providing a seasonal solar fraction of 58%, and the COP of the absorption chiller was 0.44, which was in limit, as reported in the literature for similar systems. A detailed parametric analysis was carried out to evaluate the thermal performance of the system and analyses, and the effect of design variables on the solar fraction of the system during the cooling season.

Influence of Façade Area on Thermal Performance of Building for Cooling Purposes

2018 ◽  
Author(s):  
Hamad H. Almutairi ◽  
Abdulrahman Almutairi ◽  
Jaber H. Almutairi
Keyword(s):  
Air Conditioning ◽  
Power Plants ◽  
Electrical Power ◽  
Electrical Energy ◽  
Building Design ◽  
Renewable Energy Resources ◽  
Air Conditioning System ◽  
Air Conditioners ◽  
Simulation Engine ◽  
Hot Climate

Buildings account for significant energy consumption worldwide particularly in regions where energy patterns influenced primarily by weather. Air conditioning system became an essential evaluation factor during building design and construction. The level of curiosity about air conditioning system efficiency in terms of energy usage is increasing quickly. In Kuwait; which is a hot climate country; air conditioners account for 70% of total electrical power. Electricity in Kuwait is produced entirely by the non-renewable energy resources. This work aims to assess the potential electrical savings that could be acquired by reducing building’s façade area towards East-West directional orientation in Kuwait. For this purpose, a detached building model with uniform geometry; was simulated by Energy Plus Thermal Simulation Engine through its interface with DesignBuilder software. Two cases were developed for the analysis; both have the same simulation inputs. The only difference was the orientation of the facades. The results show a reduction of about 900 kWh cooling annually if the largest facades were positioned towards north and south. The obtained saving in annual basis is attributed to about 420 kWh electrical power. Equivalent CO2 emissions associated with the saved electrical energy from power plants in Kuwait were estimated. The resulted savings are promising for early decision making for prospective buildings to be built in future.

Research on Subway Air-Conditioning System Design

2013 ◽  
Vol 411-414 ◽  
pp. 3039-3045 ◽  
Author(s):  
Zhi Chai ◽  
Jin Rui Nan ◽  
Jun Kui Huang
Keyword(s):  
Computer Simulation ◽  
Temperature Change ◽  
Cross Section ◽  
Air Conditioning ◽  
Research Method ◽  
General Characteristic ◽  
Air Conditioning System ◽  
Aeration System ◽  
Heat Quantity ◽  
Two Sides

The design of subway air-conditioning system accounts for not only the general characteristic, but also the following factors the different working circumstances and the big passengers density. In order to provide sufficient refrigerating capacity to offset the heat quantity of subway carriage, it is indispensable to install a reasonable air-conditioning, heating and aeration system to improve the comfort. In this paper the research object is the velocity and temperature change of the airflow inside the subway, and the research method is computer simulation. We study the performance and temperature change of the airflow using UG and CFD, compare and analyze the variation of the airflow in the same cross section of different models. Through comparing and analyzing the velocity and temperature change of the three models, this paper finds that the model that installs the inlets at the two sides of the subway is senior to that installs the inlets at the top of the vehicle.

Improved Energy Saving for R22 Building Air Conditioning Retrofitted with Hydrocarbon Refrigerant, Study Case: Civil Engineering Department of ITS

2014 ◽  
Vol 493 ◽  
pp. 281-286 ◽  
Author(s):  
Widyastuti ◽  
Ary Bachtiar Krishna Putra ◽  
Ridho Hantoro ◽  
Eky Novianarenti ◽  
Arrad Ghani Safitra
Keyword(s):  
Energy Consumption ◽  
Energy Saving ◽  
Air Conditioning ◽  
Civil Engineering ◽  
Action Plan ◽  
Green Building ◽  
Total Consumption ◽  
Air Conditioning System ◽  
Engineering Department ◽  
Institute Of Technology

Sepuluh November Institute of Technology (ITS) encourages the ECO Campus program. The program enables ITS to systematically identify, evaluate, manage and improve their environmental performance and practices. One of the program issue is energy saving in building. The energy saving effect of an air-conditioning system retrofit project is analyzed by Energy Conservation Opportunities (ECOs) Method. These ECOs are assessed in terms of their costs and benefits, and an economic comparison to rank the various refrigerants. Finally, an Action Plan is created where certain ECOs are selected for implementation. Civil Engineering Department has a responsibility to design infrastructure and green building concept planning. This department also has the largest energy consumption in this faculty comparing the other department. The energy consumption on this Department is 60829 kWh/month. The value of IKE is 13.39 per month with the largest electrical energy consumption in air-conditioning system is 57% from total consumption. The energy used of air-conditioning sytem is 523.692 kWh. The energy saving opportunities by CFC retrofitting with hydrocarbon can save its power consumption about 20%. It also saving cost and reducing the electricity bill of 1643871.838 IDR/month. The payback period of investment costs of retrofit R-22 to Hydrocarbonis about 13 month.

scholarly journals Student Pavilion UNIMAS for Platinum Green Building Index

2014 ◽  
Vol 5 (1) ◽  
pp. 23-27
Author(s):  
A. Baharun ◽  
S.H. Ibrahim ◽  
R. Affandi ◽  
P.G. Goh
Keyword(s):  
Thermal Comfort ◽  
Air Conditioning ◽  
Building Materials ◽  
Rainwater Harvesting ◽  
Green Building ◽  
Indoor Environmental Quality ◽  
Water Efficiency ◽  
Air Conditioning System ◽  
Thermal Transfer ◽  
Site Planning

 Green Building Index is a rating tool to evaluate a building on its sustainability. Student Pavilion in UNIMAS is a green building to cater with the GBI rating. In this study, it looks into the current facility that the building has according to six(6) criteria: energy efficiency, indoor environmental quality, sustainable site planning and management, material and resources, water efficiency, and innovation. Each criterion is evaluated accordingly to its tasks. The building of Student Pavilion has an Overall Thermal Transfer Value of 34.08 which is less than 50 as required by GBI rating guidelines. The facility is greatly relying on natural day light, when the illuminance in the room is less than 300 lux, artificial light is switched on, to fill the insufficient illuminance. There is electrical sub-metering for each tenant to monitor and diagnose the usage of electric. Solar panel at Student Pavilion can annually provide 5537.4 kWhr/year but it is insufficient to support the total electric usage of the building. Besides that, the thermal comfort of Student Pavilion is within the range of thermal comfort except for the food court area as the building is designed and built to allow for maximum wind flow and air exchange so that it would not rely on air-conditioning system. The building materials and transportation to the site is also considered in GBI. Furthermore, the water demand and rainwater harvesting at Student Pavilion is determined and it was found that the current supply of rainwater harvesting is not enough to cater with the demand of the occupants, hence larger volume of rainwater harvesting storage should be provided. The current green facility of Student Pavilionshould be improved in order to achieve Platinum in GBI.

Evaluation of Cooling Water Storage for Liquid-Desiccant Air Conditioning System

2014 ◽  
Author(s):  
Danial Salimizad ◽  
Chris McNevin ◽  
Stephen Harrison
Keyword(s):  
Air Conditioning ◽  
Electrical Power ◽  
Water Storage ◽  
Cooling Water ◽  
Operating Conditions ◽  
Coefficient Of Performance ◽  
Liquid Desiccant ◽  
Air Conditioning System ◽  
Electrical Power Consumption ◽  
Evaporative Cooling Tower

Liquid-desiccant (LD) dehumidification technology has been used to extract moisture from humid air while attempting to consume less electricity than traditional air-conditioning methods. An evaporative cooling tower (ECT) was used as a cooling device to reject the latent heat gained by the system to regenerate the desiccant solution. The performance of an ECT was evaluated both experimentally and through TRNSYS simulations to investigate optimal operating conditions. The ECT often operated in humid conditions which resulted in reduced heat rejection rates and ineffective operation. To improve performance, cooling water storage (CWS) was investigated as a way to reduce ECT usage during periods of higher ambient humidity. To undertake this study, the complete LD system, incorporating CWS, was modelled in TRNSYS for a range of typical operating conditions. The results indicated that operation of the CWS system reduced the electrical power consumption and increased the electrical coefficient of performance (COPE) of the liquid desiccant air conditioning unit system by up to 16%. The total cooling rate improved by up to 6%. Smaller gains in COPT and solar fraction were also found in the simulation results.

scholarly journals Challenge of Using Groundwater for Buildings Air Conditioning in Subtropical Areas

2021 ◽  
Vol 14 (1) ◽  
pp. 364
Author(s):  
Chih-Ping Kuo ◽  
Hung-Jiun Liao
Keyword(s):  
Latent Heat ◽  
Indoor Air ◽  
High Latitude ◽  
Air Conditioning ◽  
Electrical Power ◽  
Water System ◽  
System Optimization ◽  
Total Power ◽  
Humid Air ◽  
Air Conditioning System

Using circulating groundwater to cool air-conditioning is not new in high latitude regions but difficult in subtropical areas. Different from only using fans to remove the heat from indoor air for drier air in the high latitude region, the latent heat inside the humid air in subtropical areas makes the operation more difficult. Latent heat inside the humid air must remove away by air-conditioning including compressor and fan for cooling indoor air, which means more electrical power is required for the operation. To save total electrical power for the air-conditioning system is the main goal of this study. To use the advantage of groundwater with lower temperature to lower down the work of compressor, this research compared two ways, close/open types of water/groundwater circulation, both using groundwater to remove the heat generated by a 15RT (45 kW) air-conditioning. Full-scale tests and simulations were performed in this study to evaluate the efficiency of transferring the heat produced by air-conditioning systems to stably flowing groundwater in a grave stratum under Taipei Basin. With a closed circulating cooling water system, this study found that a 15RT air conditioner could only operate continuously for 4 h before it had to be shut down due to overheating. Additionally, groundwater must carry the heat away within the following 20 h. In changing the closed circulating water system to an open one, a system that uses a circulatory method to extract groundwater upwards and conduct heat exchange with an air conditioning system can enable the continuous operation of such a system with the same heat production condition. Numerical simulations for the heat dissipation behavior of two circulatory systems were performed herein. The results verified the aforementioned phenomena observed from both tests. The result showed both systems can provide air-conditioning working well. The total electrical power for a 15RT air-conditioning in sub-tropical areas can be reduced by 22% using circulating groundwater. Considering the system optimization, the total power consumption can be reduced by about 28%.

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