A Study on the Thermal Energy Use of Dam Reservoir Water

2018 ◽  
Vol 23 (4) ◽  
pp. 75-81
Author(s):  
Chang-Myung Seo
Keyword(s):  
Thermal Energy ◽  
Energy Use ◽  
Dam Reservoir ◽  
Reservoir Water

scholarly journals Multi-Country Analysis on Energy Savings in Buildings by Means of a Micro-Solar Organic Rankine Cycle System: A Simulation Study

Environments ◽  
2018 ◽  
Vol 5 (11) ◽  
pp. 119 ◽  
Author(s):  
Alessia Arteconi ◽  
Luca Del Zotto ◽  
Roberto Tascioni ◽  
Khamid Mahkamov ◽  
Chris Underwood ◽  
...  
Keyword(s):  
Thermal Energy ◽  
Energy Demand ◽  
Energy Use ◽  
Energy Savings ◽  
Organic Rankine Cycle ◽  
Cost Savings ◽  
Rankine Cycle ◽  
Primary Energy ◽  
Operational Cost ◽  
The North

In this paper, the smart management of buildings energy use by means of an innovative renewable micro-cogeneration system is investigated. The system consists of a concentrated linear Fresnel reflectors solar field coupled with a phase change material thermal energy storage tank and a 2 kWe/18 kWth organic Rankine cycle (ORC) system. The microsolar ORC was designed to supply both electricity and thermal energy demand to residential dwellings to reduce their primary energy use. In this analysis, the achievable energy and operational cost savings through the proposed plant with respect to traditional technologies (i.e., condensing boilers and electricity grid) were assessed by means of simulations. The influence of the climate and latitude of the installation was taken into account to assess the performance and the potential of such system across Europe and specifically in Spain, Italy, France, Germany, U.K., and Sweden. Results show that the proposed plant can satisfy about 80% of the overall energy demand of a 100 m2 dwelling in southern Europe, while the energy demand coverage drops to 34% in the worst scenario in northern Europe. The corresponding operational cost savings amount to 87% for a dwelling in the south and at 33% for one in the north.

scholarly journals Simulation of Double Pipe Heat Exchanger with Implementation of PCM

2019 ◽  
Vol 8 (12) ◽  
pp. 658-663
Keyword(s):  
Heat Exchanger ◽  
Thermal Energy ◽  
Energy Use ◽  
Phase Change Materials ◽  
Time Step ◽  
Contour Plots ◽  
Materials Used ◽  
Double Pipe ◽  
Thermal Energy Storage Systems ◽  
Pipe Heat

In the present time several techniques have been developed in managing and storing thermal energy. Use of Thermal energy storage systems (TES) are one of the solutions for this issue. Hence in the present work, phase change materials (PCM) are used for storing thermal energy. D-mannitol and Hydroquinone are the two PCM materials used in double pipe heat exchanger and simulations are carried out analytically on ANSYS. Study of temperature variation is done with respect to time and values are calculated for time, t = 200, 500, 2200 and 4200 seconds. The results also include contour plots and numerical values for mass fraction for each of the case. The result shows, that with increase in the time step, the temperature gradually increases for both the cases of PCM materials.

Solar Thermal Energy Use in EU-27 Countries: Evolution and Promotion

2013 ◽  
pp. 241-266
Author(s):  
María P. del Pablo-Romero ◽  
Antonio Sánchez-Braza ◽  
Enrique Lerma
Keyword(s):  
Thermal Energy ◽  
Energy Use ◽  
Solar Thermal ◽  
Solar Thermal Energy

scholarly journals Continuous and Periodic Monitoring System of Surface Water Quality of an Impounding Reservoir: Sulejow Reservoir, Poland

2019 ◽  
Vol 16 (3) ◽  
pp. 301
Author(s):  
Aleksandra Ziemińska-Stolarska ◽  
Mirosław Imbierowicz ◽  
Marcin Jaskulski ◽  
Aleksander Szmidt ◽  
Ireneusz Zbiciński
Keyword(s):  
Water Quality ◽  
Surface Water ◽  
Monitoring System ◽  
Online Monitoring ◽  
Surface Water Quality ◽  
Dam Reservoir ◽  
Reservoir Water ◽  
Periodic Monitoring

Keywords: online monitoring; dam reservoir; water quality; multi-parameter probe; eutrophication

scholarly journals Spatial Distribution of Phytoplankton and Physico-Chemical Characteristics of Reservoir Agaie-Lapai Dam, Minna, Niger State, Nigeria

2016 ◽  
Vol 7 (2) ◽  
pp. 1
Author(s):  
Ojutiku R. O. ◽  
Kolo R. J. ◽  
Yakubu M. A.
Keyword(s):  
Chemical Characteristics ◽  
Chemical Parameters ◽  
Dam Reservoir ◽  
Reservoir Water ◽  
Aquatic Life ◽  
Physico Chemical ◽  
Irrigation Purpose ◽  
Productive Water ◽  
Taxonomic Groups ◽  
Fish Productivity

<p class="jbls">Presence of phytoplankton displays water quality and useablity by aquatic life. Agaie-Lapai Dam located in Niger State (latitude 9⁰ 39N and longitude 6⁰33E) was constructed for irrigation purpose and also to serves as source of livelihood to fishermen living in surroundings. The objective of the present research was conducted to assess the distribution of phytoplankton and physic-chemical assessment of Agaie-Lapai Dam. Reservoir Water.  Samples were collected fortnightly and analyzed for phytoplankton and physico-chemical parameters. The dissolved oxygen ranged from 3.8 – 5.15mg/l and temperature from 24.6 – 29.0<sup>0</sup>C.  A total of 14 species of 5 taxonomic groups were recorded. Bacillariophyceae was the most abundant group (44%) followed by Chlorophyceae (26%) while the lowest was Dinophyceae (8%). Phytoplankton abundances in the following descending order: Bacillariophyceae&gt;Cyanophyceae&gt;Chlorophyceae&gt;Chrysophyceae&gt;Dinophyceae.The spatial analysis revealed that phytoplankton was not equally distributed in the water that enabled it to function as productive water body. The observed physico-chemical parameters fell within thus it was within the tolerable limits. It is expected that the identified species will enhance fish productivity. </p>

scholarly journals Thermal energy storage

2020 ◽  
Vol 2 (2) ◽  
pp. 66-88 ◽  
Author(s):  
Fehim Findik ◽  
Kemal Ermiş
Keyword(s):  
Energy Storage ◽  
Thermal Energy ◽  
Thermal Energy Storage ◽  
Large Scale ◽  
Energy Use ◽  
Supply And Demand ◽  
Environmentally Benign ◽  
Energy Technology ◽  
Effective Use ◽  
Thermal Energy Storage Systems

Thermal energy storage (TES) is an advanced energy technology that is attracting increasing interest for thermal applications such as space and water heating, cooling, and air conditioning. TES systems have enormous potential to facilitate more effective use of thermal equipment and large-scale energy substitutions that are economic. TES appears to be the most appropriate method for correcting the mismatch that sometimes occurs between the supply and demand of energy. It is therefore a very attractive technology for meeting society’s needs and desires for more efficient and environmentally benign energy use. In this study, thermal energy storage systems, energy storage and methods, hydrogen for energy storage and technologies are reviewed.

scholarly journals Controlled Mechanical Ventilation in Buildings: A Comparison between Energy Use and Primary Energy among Twenty Different Devices

Energies ◽  
2018 ◽  
Vol 11 (8) ◽  
pp. 2123 ◽  
Author(s):  
Lamberto Tronchin ◽  
Kristian Fabbri ◽  
Chiara Bertolli
Keyword(s):  
Mechanical Ventilation ◽  
Energy Consumption ◽  
Thermal Energy ◽  
High Performance ◽  
Energy Use ◽  
Operating Cost ◽  
Primary Energy ◽  
Energy Requirements ◽  
Controlled Mechanical Ventilation

Indoor air quality (IAQ) of buildings is a problem that affects both comfort for occupants and the energy consumption of the structure. Controlled mechanical ventilation systems (CMVs) make it possible to control the air exchange rate. When using CMV systems, it is interesting to investigate the relationship between the useful thermal energy requirements for ventilation and the energy consumption of these systems. This paper addresses whether there is a correlation between these two parameters. The methodology used in this work involves the application of equations of technical Italian regulations UNI/TS 11300 applied to a case study. The case study is represented by a 54 m3 room, which is assumed to have three CMV systems installed (extraction, insertion, insertion and extraction) for twenty different devices available on the market. Afterwards, simulations of useful thermal energy requirements QH,ve and primary energy EP,V were performed according to the electrical power of each fan W and the ventilation flow. The results show that the two values are not linearly correlated: it is not possible to clearly associate the operating cost for CMV systems according to building requirements. The study also shows that CMV systems are particularly efficient for high-performance buildings, where there is no leakage that can be ascribed to windows infiltrations.

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