scholarly journals Energy balancing in ground heat exchanger for heat pump systems – a case study with simulations

2019 ◽  
Vol 100 ◽  
pp. 00076
Author(s):  
Ewelina Stefanowicz ◽  
Małgorzata Szulgowska-Zgrzywa
Keyword(s):  
Renewable Energy ◽  
Heat Pump ◽  
Negative Impact ◽  
Renewable Energy Sources ◽  
Cooling Load ◽  
Energy Balancing ◽  
Heating And Cooling ◽  
Large Heat ◽  
Heating Load

The negative impact of systems based on fossil fuel on the environment and the desire to promote sustainable development is increasingly encouraging building owners to invest in renewable energy sources. One of the possibilities of using a renewable energy source located in shallow soil layers is a brine-to-water heat pump. Ground energy can be used for both heating and cooling buildings. This article presents the advantages of balancing the supply and energy consumption from the ground for the large heat pump systems. Authors presented a case study and the simulation of the system operation with different cooling load share vs heating load. This was done on the basis of the analysis of data from several years of measurements from the actual installation as well as the simulation in Earth Energy Designer software. The results of the simulations shows that the most advantageous strategy for the operation of the analysed installation is to provide 50 to 75% of the cooling load in relation to the heating load.

scholarly journals Natural resources and regional development: Case study of the Gornje Polimlje region in Montenegro

Ekonomika ◽  
2021 ◽  
Vol 67 (1) ◽  
pp. 91-103
Author(s):  
Đoko Raičević ◽  
Miloš Marjanović ◽  
Vladimir Đorđević
Keyword(s):  
Renewable Energy ◽  
Natural Resources ◽  
Regional Development ◽  
Negative Impact ◽  
Renewable Energy Sources ◽  
Energy Sources ◽  
Northeastern Part ◽  
Qualitative And Quantitative ◽  
Further Development

The Gornje Polimlje has all characteristics of the geographical region, which some of the areas, or just part of them, left many author's works of impassable value. The northeastern part of Montenegro possesses, in qualitative and quantitative aspects, an enormous wealth of natural values. It was unexpectedly and unacceptably economically neglected in the last fifty years in Montenegro's development. The paper aims to present the natural resources of the Gornje Polimlje region and the way of their valorization in the function of equal development of this region. Tourism is seen as an activity that would produce great economic results with the least negative impact on nature. The conclusion is that natural resources are either underutilized or utilized in the wrong way. Further development should be based on the exploitation of natural resources, first of all on the development of sustainable tourism and the use of renewable energy sources.

scholarly journals Renewable Heating and Cooling Solutions for Buildings and Industry

Proceedings ◽  
2020 ◽  
Vol 65 (1) ◽  
pp. 16
Author(s):  
Andrea Frazzica ◽  
Régis Decorme ◽  
Marco Calderoni ◽  
Alessandra Cuneo ◽  
Zuzana Taťáková ◽  
...  
Keyword(s):  
Renewable Energy ◽  
Heat Pump ◽  
Solar Thermal ◽  
Renewable Energy Technologies ◽  
Energy Technologies ◽  
Heating And Cooling ◽  
Common Strategy ◽  
Selection Of

This workshop brought together a selection of H2020 EU-funded projects involving experts from the biomass, geothermal, solar thermal, and heat pump sectors to discuss a common strategy for increasing the use of renewable energy technologies for heating and cooling for buildings and industry.

scholarly journals A review of challenges and benefits of integration of CHP plant into the grid: a case study in Serbia

2021 ◽  
Author(s):  
Rade M. Ciric ◽  
Sasa N. Mandic
Keyword(s):  
Energy Efficiency ◽  
Negative Impact ◽  
Renewable Energy Sources ◽  
Increase Energy Efficiency ◽  
High Voltage Supply ◽  
The Republic ◽  
Technical Solutions ◽  
The Impact

AbstractThe Republic of Serbia must make significant efforts to promote and exploit renewable energy sources and increase energy efficiency in all energy sectors to ensure energy security and economic competitiveness, reduce the negative impact on the environment from energy production and use, and contribute to global efforts to reduce greenhouse gases. Within the paper several issues of integration of recently realized CHP plant are introduced and discussed. Firstly, the legal and energy policy issues in the Republic of Serbia regarding connecting CHP to the grid are presented. The challenges and technical solutions for CHP connection to the grid, as well as power quality issues and the role of the CHP plant during the restoration of power supply during the maintenance of the substation and unplanned loss of high voltage supply, are presented and discussed. Finally, the impact of prospective massive integration of CHP on the energy balance and CO2 emission reduction in the province of Vojvodina in Serbia is investigated and discussed. Since it is the first CHP plant realized in Serbia, it is crucial that experience be shared to all potential stakeholders in the future energy efficiency projects.

scholarly journals Portfolio optimization of power plants by using renewable energy in Iran

2020 ◽  
Author(s):  
Seyedeh Asra Ahmadi ◽  
Seyed Mojtaba Mirlohi ◽  
Mohammad Hossein Ahmadi ◽  
Majid Ameri
Keyword(s):  
Renewable Energy ◽  
Portfolio Optimization ◽  
Energy Supply ◽  
Power Plants ◽  
Renewable Energy Sources ◽  
Modern Society ◽  
Sustainable Growth ◽  
Electricity Sector ◽  
Capital Costs

Abstract Lack of investment in the electricity sector has created a huge bottleneck in the continuous flow of energy in the market, and this will create many problems for the sustainable growth and development of modern society. The main reason for this lack of investment is the investment risk in the electricity sector. One way to reduce portfolio risk is to diversify it. This study applies the concept of portfolio optimization to demonstrate the potential for greater use of renewable energy, which reduces the risk of investing in the electricity sector. Besides, it shows that investing in renewable energies can offset the risk associated with the total input costs. These costs stem from the volatility of associated prices, including fossil fuel, capital costs, maintenance, operation and environmental costs. This case study shows that Iran can theoretically supply ~33% of its electricity demand from renewable energy sources compared to its current 15% share. This case study confirms this finding and predicts that Iran, while reducing the risk of investing in electricity supply, can achieve a renewable energy supply of ~9% with an average increase in supply costs. Sensitivity analysis further shows that with a 10% change in input cost factors, the percentage of renewable energy supply is only partially affected, but basket costs change according to the scenario of 5–32%. Finally, suggestions are made that minimize risk rather than cost, which will bring about an increase in renewable energy supply.

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