Exergy Analysis and Optimization of a Building Air Conditioning System in Tropical Climate

2014 ◽  
Author(s):  
Ricardo Salazar ◽  
Enrico Sciubba ◽  
Claudia Toro
Keyword(s):  
Renewable Energy ◽  
Energy Consumption ◽  
Air Conditioning ◽  
Energy Use ◽  
Exergy Analysis ◽  
Electric Energy ◽  
Point Of View ◽  
Primary Sources ◽  
Renewable Energy Consumption ◽  
Air Conditioning System

The space conditioning sector is one of the highest exergy consumers and least efficient from the point of view of primary-to-end-use matching. Exergy analysis can be considered as a reliable tool for analyzing and optimizing energy consumption related to building conditioning systems. The present study presents a comparative exergy analysis of the air conditioning system of the TOTAL S.A. offices located in Caracas, Venezuela to finally achieve a reduction of the global electric energy use of the considered building. Starting from the provided thermal cooling load, different possible cooling chains (primary-to-final energy conversion chain) are considered in order to locate the thermodynamically more efficient one from an exergetic point of view. The internal air handler unit, which provides for the cooled and dehumidified air to the building, is fed by the energy obtained from different possible converters of renewable energy primary sources. Specifically, solar and hybrid photovoltaic-thermal (PV/T) panels coupled with an absorption refrigeration machine and with an ejector refrigeration cycle are analyzed. The study that has been carried on leads to identify the most convenient matching between final use and primary sources allowing to substantially reduce the global non-renewable energy consumption of the considered building.

Exergy Analysis of Energy Consumption for Central Air Conditioning System

2014 ◽  
Vol 628 ◽  
pp. 332-337
Author(s):  
Xiao Xia Xia ◽  
Nai Jun Zhou ◽  
Zhi Qi Wang
Keyword(s):  
Energy Consumption ◽  
Air Conditioning ◽  
Exergy Analysis ◽  
Exergy Efficiency ◽  
Dew Point ◽  
Exergy Loss ◽  
Air Conditioning System ◽  
Air Cooler ◽  
Central Air Conditioning ◽  
Air Conditioning Systems

The energy consumption of several central air conditioning systems in summer was researched by the method of exergy analysis. Combined with actual example,the exergy loss of all the equipments and the exergy efficiency of three systems were calculated. The results show that the exergy efficiency of three systems is very low. Relatively speaking, the exergy efficiency of primary return air conditioning system with supplying air in dew point is highest. The equipment of highest exergy loss is air-conditioned room, while the exergy loss of surface air cooler is smallest. Based on this, several improvement measures were proposed to reduce exergy loss and improve exergy efficiency.

scholarly journals The Relationship between Financial Development and Renewable Energy Consumption in South Asian Countries

2021 ◽  
Author(s):  
Sakib Amin ◽  
Farhan Khan ◽  
Ashfaqur Rahman
Keyword(s):  
Renewable Energy ◽  
Energy Consumption ◽  
Financial Development ◽  
Energy Use ◽  
Green Energy ◽  
Renewable Energy Consumption ◽  
Causality Test ◽  
Cross Sectional ◽  
Long Run ◽  
Cointegration Tests

Abstract We analyse how the financial development and green energy use are linked to the countries of South Asia from 1990 to 2018. Domestic credit to the private sector and renewable energy consumption is being used in this paper as indicators of financial development and the use of renewable energy. On the indication of cross-sectional dependency among the variables of the models, we apply second generation panel unit root tests and cointegration tests to check the stationarity properties and long-run cointegration relation among the variables. We find that variables are stationary at the first difference, and long-run cointegration exists. By applying robust dynamic heterogeneous and cross-section augmented estimators, we find that increase in GDP increases renewable energy consumption by 1.56-0.50%; however reduces by 0.07-0.03% after certain thresholds. Furthermore, increase in financial development, on average, reduces the propensity of renewable energy consumption by 0.15-0.07% in the long-run. On the other hand, the Dumitrescu-Hurlin panel causality test shows a unidirectional relationship from GDP to financial development and financial development to renewable energy consumption but not vice versa. We suggest that the selected countries revisit and restructure the renewable energy policy and emphasise institutional reforms to strengthen renewable energy development in the upcoming years.

scholarly journals Contribution of Renewable Energy Consumption to CO2 Emission Mitigation: A Comparative Analysis from a Global Geographic Perspective

2021 ◽  
Vol 13 (7) ◽  
pp. 3853
Author(s):  
Junsong Jia ◽  
Jing Lei ◽  
Chundi Chen ◽  
Xu Song ◽  
Yexi Zhong
Keyword(s):  
Renewable Energy ◽  
Energy Consumption ◽  
Energy Use ◽  
Policy Implications ◽  
Sub Saharan Africa ◽  
Emission Mitigation ◽  
Renewable Energy Consumption ◽  
The Pacific ◽  
Sub Saharan ◽  
Geographic Perspective

Renewable energy consumption (REC) has an important significance in mitigating CO2 emissions. However, currently, few scientists have analyzed the underlying impact of REC from a global geographic perspective. Thus, here, we divide the world into seven regions to study this impact during the period 1971–2016 using the logarithmic mean Divisia index (LMDI). These regions were East Asia and the Pacific (EAP), Europe and Central Asia (ECA), Latin America and the Caribbean (LAC), Middle East and North Africa (MENA), North America (NA), South Asia (SA), and Sub-Saharan Africa (SSA). The results showed that ECA had the most obviously mitigating effect of −10.13%, followed by NA and MENA (−3.91% and −3.87%, respectively). Inversely, EAP had the largest driving effect of 4.12%, followed by SA (3.43%) and the others. Globally, REC had an overall mitigating contribution of −11.04% to total CO2 change. These results indicate that it is still important to exploit and utilize renewable energy, especially in presently developing or underdeveloped countries. Moreover, for some countries at a certain stage, their REC effects were negative, but, concurrently, their energy intensity effects were positive. These results show that some developing countries recently reduced carbon emissions only by extensively using renewable energy, not by enhancing energy-use efficiency. Finally, some policy implications for reducing CO2 in different countries are recommended.

scholarly journals INVESTIGATION OF RENEWABLE ENERGY USE IN THE P2X TECHNOLOGY

2021 ◽  
pp. 19-30
Author(s):  
NIMA NOROUZI
Keyword(s):  
Energy Efficiency ◽  
Renewable Energy ◽  
High Temperature ◽  
Carbon Emissions ◽  
Energy Use ◽  
Electric Energy ◽  
Electricity Price ◽  
Synthesis Process ◽  
Coal Consumption ◽  
Renewable Energy Consumption

Objective: The electricity-to-hydrogen technology can convert surplus renewable energy electric energy into chemical energy. Hydrogen plays an important role in transportation, power generation, and other fields. Therefore, developing electrochemical (P2X) technology for renewable energy consumption effectively solves renewable energy curtailment. Methods: The four aspects of market scale, technical route, energy conversion efficiency, and demonstration project progress are reviewed, and the energy efficiency of the four electrochemical technologies is compared, Power consumption, marginal electricity price, equivalent output, and market share five major technical and economic indicators. To analyze the strengths, weaknesses, opportunities, and threats of P2X in China, a literature review survey was conducted, relying on recent two-decade publications from four main publishers: Scopus, Springer, Wiley, and Taylor and Francis. Keywords were selected from the first-hand references based on their impact on P2X or related topics listed in the literature databases. The keywords as Power to X, Power to chemicals, PtX, and P2X were chosen according to their actual involvement or keen interest in P2X projects. Results: The research results based on the low-temperature electrolysis technology route show that the comprehensive energy efficiency of the electricity-to-methane and electricity-to-gasoline technologies is higher (50%); the electricity-to-gasoline technology is the most economical (marginal electricity price is 0.37 yuan/kWh), but the synthesis process requires carbon monoxide and carbon emissions, And the technical risk is high; the promotion of electricity to ammonia will have the greatest impact on the market (17.18%). Reducing coal consumption by about 22.85 million tons and the environmental protection significance of electricity-to-ammonia conversion (reducing carbon emissions by about 39.1 million tons) are two important directions for future electrochemical technology. Conclusion: Facing the development of P2X technology in the future, the plan and economics of the high-temperature electrical and chemical technology route based on high-temperature solid oxides were preliminary discussed and prospected.

scholarly journals The Role of Renewable Energy Consumption Towards Carbon Neutrality in BRICS Nations: Does Globalization Matter?

2021 ◽  
Vol 9 ◽  
Author(s):  
Liu Dingru ◽  
Muhammad Ramzan ◽  
Muhammad Irfan ◽  
Özge Gülmez ◽  
Hayriye Isik ◽  
...  
Keyword(s):  
Renewable Energy ◽  
Energy Consumption ◽  
Technological Innovation ◽  
Ecological Footprint ◽  
Energy Use ◽  
Vital Role ◽  
Kuznets Curve ◽  
Renewable Energy Consumption ◽  
Carbon Neutrality

Although a number of studies have been conducted on the environmental Kuznets curve (EKC) and the pollution halo hypothesis (PHH), few researchers have assessed the scope in the light of the BRICS— Brazil, Russia, India, China, and South Africa—nations. Therefore, the current research assesses the income-induced EKC as well as the role of technological innovation and renewable energy consumption utilizing a dataset stretching from 1990 to 2018. The present research utilized the novel method of moments quantile regression (MMQR) developed by Machado and Silva (2019) to assess these interrelationships. The empirical outcomes from the MMQR affirmed an inverted U-shaped interrelationship between CO2 emissions and economic growth across all quantiles (first to ninth) for the BRICS nations, thus confirming the presence of the EKC hypothesis. Furthermore, we affirmed the PHH, thus confirming the negative interrelationship between globalization and ecological footprint across all quantiles (first to ninth). Moreover, it was found that renewable energy use plays a vital role in curbing the emissions of CO2 across all quantiles (first to ninth), while no evidence of significant connection was established between technological innovation and ecological footprint across all quantiles. In addition, the Granger causality outcomes revealed a feedback causality between income and ecological footprint, while a unidirectional causality was established from globalization and renewable energy use to ecological footprint.

Cold and Heat Source Energy-Saving Reconstruction for Central Air-Conditioning System in a Research and Development Center of Shanghai

2011 ◽  
Vol 204-210 ◽  
pp. 327-331
Author(s):  
Jin Wang ◽  
Jing Jing Xin ◽  
You Tao Zhou ◽  
Xin Lin Li ◽  
Shu Sheng Li
Keyword(s):  
Energy Consumption ◽  
Heat Source ◽  
Research And Development ◽  
Energy Saving ◽  
Air Conditioning ◽  
Electric Energy ◽  
Air Conditioning System ◽  
Central Air Conditioning ◽  
One Year ◽  
Development Center

Central air-conditioning energy consumption accounts for a large proportion of the buildings. And cold and heat source energy consumption accounts for about two-thirds of central air-conditioning system. For a research and development center in Shanghai, because cold and heat source capacity largely surpasses the actual demand, we propose to combine with cold sources of the two buildings. We call it "two-in-one" reconstruction. When cooling load is small, we use cold source in one building to support the two buildings. After implementation, by return on investment analysis, the average electric energy-saving rate is 9.6%. Investment can be recovered within one year.

Impact of Globalization and Renewable Energy Consumption on Environmental Degradation: A Lesson for South Africa

2021 ◽  
Vol 11 (1) ◽  
pp. 145-155
Author(s):  
Seun Damola Oladipupo ◽  
Husam Rjoub ◽  
Dervis Kirikkaleli ◽  
Tomiwa Sunday Adebayo
Keyword(s):  
Economic Growth ◽  
South Africa ◽  
Renewable Energy ◽  
Energy Consumption ◽  
Co2 Emissions ◽  
Environmental Degradation ◽  
Energy Use ◽  
Sustainable Growth ◽  
Renewable Energy Consumption ◽  
Nonrenewable Energy

South Africa is one of Africa's most polluted countries, with rising CO2 emissions posing a threat. South Africa must discover ways of minimizing pollution and take necessary steps before it is too late in order to achieve sustainable growth. For this purpose, this research assesses the ecological consequences of globalization, nonrenewable energy use, economic growth and renewable energy consumption in South Africa. The study leverages on the non-linearity advantages of the novel quantile on quantile regression (QQR) method for a robust analysis as opposed to the use of conventional linear approaches, thereby overcoming conspicuous shortfalls in extant studies, while offering a detailed explanation of the overall dependency structure between CO2 emissions and globalization, nonrenewable energy use and renewable energy use using a dataset covering the period between 1970 and 2018. The outcomes suggest that nonrenewable energy use, globalization, and economic growth contribute to environmental degradation in the majority of the quantiles, while the effect of renewable energy use on CO2 is not strong at all quantiles. The study highlights that economic expansion, nonrenewable energy use and globalization play key roles in in mitigating environmental sustainability in South Africa, while renewable energy is not sufficient to meet environmental requirements.

System Optimization and Exergy Analysis of Air Conditioning System for Data Center

2013 ◽  
Vol 291-294 ◽  
pp. 1857-1862
Author(s):  
You Yin Jing ◽  
Qian Qian Liu ◽  
Jiang Jiang Wang
Keyword(s):  
Energy Consumption ◽  
Data Center ◽  
Air Conditioning ◽  
Exergy Analysis ◽  
Operation Mode ◽  
System Optimization ◽  
Maximum Efficiency ◽  
System Operation ◽  
Air Conditioning System ◽  
Suitable Combination

As the air conditioning energy consumption of the date center has increasingly become the focus of attention, reformation for the energy consumption and exploration for the suitable combination model of the air conditioning system have significance in energy saving. This paper makes a program design for the air-conditioning system of a data center in Beijing, makes an analysis of the system operation mode and uses the concept of exergy efficiency to optimize the air conditioning system in order to achieve maximum efficiency.

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