scholarly journals Study on Geospatial Distribution of the Efficiency and Sustainability of Different Energy-Driven Heat Pumps Included in Low Enthalpy Geothermal Systems in Europe

2020 ◽  
Vol 12 (7) ◽  
pp. 1093
Author(s):  
Ignacio Martín Nieto ◽  
David Borge-Diez ◽  
Cristina Sáez Blázquez ◽  
Arturo Farfán Martín ◽  
Diego González-Aguilera

This research work aims at a multinational study in Europe of the emissions and energy costs generated by the operation of low enthalpy geothermal systems, with heat pumps fed by different energy sources. From an economic point of view, natural gas and biogas prices are, usually, lower than electricity ones. So it may be advantageous to use these energy sources to feed the heat pumps instead of electricity. From the environmental point of view, it is intended to highlight the fact that under certain conditions of electricity production (electricity mix), more CO2 emissions are produced by electricity consumption than using other a priori less “clean” energy sources such as natural gas. To establish the countries where each of the different heat pumps may be more cost-efficient and environmentally friendly, data from multi-source geospatial databases have been collected and analyzed. The results show that in the majority of cases, the electric heat pump is the most recommendable solution. However, there are some geographic locations (such as Poland and Estonia), where the gas engine heat pump may be a better alternative.

2019 ◽  
Vol 11 (0) ◽  
pp. 1-5
Author(s):  
Artur Rogoža ◽  
Giedrius Šiupšinskas ◽  
Juozas Bielskus ◽  
Violeta Misevičiūtė

Renewable energy technologies are increasingly integrated into the modernization of multi-apartment buildings, however their benefits are rarely assessed from a complex environmental, energy and economic point of view. The article presents the results of the modernization of a particular apartment building in terms of the production and consumption of energy in a building, from the viewpoint of the life cycle. The benefits of the building’s energy modernization were assessed by introducing active (heat pumps and solar collectors for hot domestic water production) and passive modernization measures. The results show that the integration of heat pumps when electricity is produced from non-renewable energy sources according to the analyzed categories of life cycle analysis is not eco-friendly.


Energies ◽  
2021 ◽  
Vol 14 (4) ◽  
pp. 1063
Author(s):  
Catalina Hernández Moris ◽  
Maria Teresa Cerda Guevara ◽  
Alois Salmon ◽  
Alvaro Lorca

The energy sector in Chile demands a significant increase in renewable energy sources in the near future, and concentrated solar power (CSP) technologies are becoming increasingly competitive as compared to natural gas plants. Motivated by this, this paper presents a comparison between solar technologies such as hybrid plants and natural gas-based thermal technologies, as both technologies share several characteristics that are comparable and beneficial for the power grid. This comparison is made from an economic point of view using the Levelized Cost of Energy (LCOE) metric and in terms of the systemic benefits related to flexibility, which is very much required due to the current decarbonization scenario of Chile’s energy matrix. The results show that the LCOE of the four hybrid plant models studied is lower than the LCOE of the gas plant. A solar hybrid plant configuration composed of a photovoltaic and solar tower plant (STP) with 13 h of storage and without generation restrictions has an LCOE 53 USD/MWh, while the natural gas technology evaluated with an 85% plant factor and a variable fuel cost of 2.0 USD/MMBtu has an LCOE of 86 USD/MWh. Thus, solar hybrid plants under a particular set of conditions are shown to be more cost-effective than their closest competitor for the Chilean grid while still providing significant dispatchability and flexibility.


2016 ◽  
Vol 15 (2) ◽  
pp. 327-349 ◽  
Author(s):  
RACHEL BREWSTER ◽  
CLAIRE BRUNEL ◽  
ANNA MARIA MAYDA

AbstractIn this paper we claim that, in the WTO Appellate Body (AB)'s ruling in US‒Countervailing Measures (China), the AB decision has not put in question the practice of imposing countervailing duties (CVDs). While the US has formally ‘lost’ the case, a change in the procedures and tests used to motivate the CVD will allow the US to continue using this policy tool on the specified products. From an economic point of view, this is not welcome news since CVDs have the standard distortionary effects of tariffs and could go against environmental goals. From a political-economy point of view, the CVDs in this case appear driven by pressure of domestic manufacturers of clean energy technology and products.


Author(s):  
Xiling Zhao ◽  
Xiaoyin Wang ◽  
Tao Sun

Distributed peak-shaving heat pump technology is to use a heat pump to adjust the heat on the secondary network in a substation, with features of low initial investment, flexible adjustment, and high operating cost. The paper takes an example for the system that uses two 9F class gas turbines (back pressure steam) as the basic heat source and a distributed heat pump in the substation as the peak-shaving heat source. The peak-shaving ratio is defined as the ratio of the designed peak-shaving heat load and the designed total heat load. The economic annual cost is taken as a goal, and the optimal peak-shaving ratio of the system is investigated. The influence of natural gas price, electricity price, and transportation distance are also analyzed. It can provide the reference for the optimized design and operation of the system.


Author(s):  
Sérgio António Neves Lousada ◽  
Rui Alexandre Castanho

Nowadays, the high environmental sensitivity and economic constraints, as well as future prospects for development, require a strong sustainable energy policy. Such policies should be based on the local resource valorization – which gains more emphasis in ultra-peripheral territories as the case of the Madeira and Canary Archipelagos. In fact, renewable energy sources become more competitive from the economic point of view – however, with high environmental and social benefits in both Archipelagos. Thus, the local policies of Porto Santo Island will be inspired on the neighbor archipelago (Canary Islands), more specifically in the El Hierro Island – which is one of the worldwide leaders in sustainability issues. Contextually, the work enables a view through the cooperation perspective, highlighting sustainability strategies in Porto Santo Island (Madeira, Portugal) and El Hierro Island (Canary, Spain). Therefore, it will address diverse forms of energy production through natural resources with influence on spatial planning.


2019 ◽  
Vol 3 (2) ◽  

In the recent attempts to stimulate alternative energy sources for heating and cooling of buildings, emphasise has been put on utilisation of the ambient energy from ground source heat pump systems (GSHPs) and other renewable energy sources. Exploitation of renewable energy sources and particularly ground heat in buildings can significantly contribute towards reducing dependency on fossil fuels. The study was carried out at the Energy Research Institute (ERI), between September 2016 and November 2017. This paper highlights the potential energy saving that could be achieved through use of ground energy source. The main concept of this technology is that it uses the lower temperature of the ground (approximately <32°C), which remains relatively stable throughout the year, to provide space heating, cooling and domestic hot water inside the building area. The purpose of this study, however, is to examine the means of reducing of energy consumption in buildings, identifying GSHPs as an environmental friendly technology able to provide efficient utilisation of energy in the buildings sector, promoting the use of GSHPs applications as an optimum means of heating and cooling, and presenting typical applications and recent advances of the DX GSHPs. It is concluded that the direct expansion of GSHP are extendable to more comprehensive applications combined with the ground heat exchanger in foundation piles and the seasonal thermal energy storage from solar thermal collectors. This study highlights the energy problem and the possible saving that can be achieved through the use of the GSHP systems. This article discusses the principle of the ground source energy, varieties of GSHPs, and various developments.


2021 ◽  
Vol 2021 ◽  
pp. 1-10
Author(s):  
Lili Zuo ◽  
Sirui Zhao ◽  
Yaxin Ma ◽  
Fangmei Jiang ◽  
Yue Zu

During the process of distributing natural gas to urban users through city gate stations, hydrate is easy to form due to the existence of throttling effect which causes safety risks. To handle this problem, a program to quickly calculate hydrate prediction and prevention methods for city gate stations is developed. The hydrate formation temperature is calculated through the Chen–Guo model, and the Peng–Robinson equation of state combined with the balance criterion is used to analyze the water condensation in the throttling process. The Wilson activity coefficient model is used to calculate the mass fraction in the liquid phase of thermodynamic inhibitors for preventing hydrates. Considering the volatility of inhibitors, the principle of isothermal flash has been utilized to calculate the total injection volume of the inhibitor. Moreover, the effects of commonly used methanol and ethylene glycol inhibitors are discussed. In terms of safety and sustainability, the ethanol inhibitor, which is considered for the first time, exhibited better prevention and control effects under conditions with relatively high temperature and low pressure after throttling. Combined with the actual working conditions of a gate station, methanol has the best inhibitory effect, followed by ethylene glycol. From an economic point of view, the benefits of the gas phase of the inhibitor during the delivery of natural gas are obvious; therefore, the method of methanol injection is recommended for hydrate prevention. If the gas phase benefits of the inhibitor are not considered, the ethylene glycol injection method becomes more economical.


2019 ◽  
Vol 8 (3) ◽  
pp. 3723-3731

It is known that the price of natural gas liquids (NGL) is higher than that of natural gas from which it is derived, so more modifications needed for existing plants to derive more NGL is economically accepted point of view. The main objective of the present work is to present the method applied on Trans gulf (T/G) gas plant to overcome its performance decrease happened after the plant feed gases becoming leaner than its design margin and hence it led to a great decrease in the plant NGL recovery. This achieved by introducing a new simple modification to the existing process scheme obtained by using a condensate stream to enrich the reflux of the de-ethanizer tower so more recovery is obtained. In order to accomplish that goal, some changes in the existing process operating conditions were needed. A simulation is used in this study to examine the existing and the introduced modification utilizing ASPEN-HYSYS software version 8.4 using Peng-Robinson equation of state (EOS). The simulation of the existing plant results in a better understanding of the plant behavior in the different iterations to reach the maximum benefits. The plant after suffering from low butane recovery from its feed gas and which considered as a figure to the plant efficiency, it increased by this method from 38 % to reach 86-90 % butane recovery and its LPG production increased by 170% to be ≈ 122 tonne/day instead of ≈ 44 tonne/day while only losing ≈ 16 tonne/day of condensate production. An optimization to the new method is done in this paper so that it doesn't intercept with the existing plant equipment performance for the process safety triggers. Also, the last section of the study describes the economic point of view and the return on investment (ROI) how it was paid back only in 7 days. This modification can be taken as a guideline for both new and existing LPG plants which use only propane refrigeration systems for LPG recovery to increase their profits with the lowest cost possible.


2021 ◽  
Vol 286 ◽  
pp. 02014
Author(s):  
Gheorghe Lăzăroiu ◽  
Lucian Mihăescu ◽  
Dana-Alexandra Ciupăgeanu ◽  
Rodica-Manuela Grigoriu ◽  
Dana-Andreya Bondrea

The paper presents an investigation on the conditions for implementing a methanation membrane decarbonator coupled to an energy installation that generates flue gases. The retention of the carbon dioxide content in the flue gases and its conversion to methane is envisaged. For start, low thermal power installations, employing natural gas as main fuel supply, are considered. Internal combustion engines (also working with natural gas fuel) are taken into account for the testing of the carbon dioxide retention process. For this, a classification of the flue gas composition by fuel categories is initially carried out. The decarbonation efficiency is defined and clarifications are made withal regarding the connection between the decarbonation installation and the energy plant. The first practical achievements are also presented, resulting from a decarbonator with a volume of 940 cm3 (having the inner diameter of 12 cm and a height of 50 cm). The results prove that the proposed solution has great potential for practical applications, further research being however necessary. In terms of operating costs (including hydrogen consumption), it is remarked that they can be reduced by exploiting the methane production and eliminating the carbon tax, extending the integration perspective form economic point of view.


2012 ◽  
Vol 52 (1) ◽  
pp. 195
Author(s):  
Doug Young

The Clean Energy Act (CEA) and its related legislation received royal assent on 18 November 2011, ushering in a new era for the Australian industry, and for those who deal with it. Building on the 2007 National Greenhouse and Energy Reporting Scheme (NGERS), which mandates the measurement and reporting of greenhouse gas emissions and electricity production and consumption, the CEA imposes direct obligations on: individual industrial operations (facilities) that emit more than 25,000 tonnes of carbon dioxide, or its other equivalent greenhouse gases, from particular sources, in a year; suppliers of natural gas (at the point of last supply before the gas is burnt or otherwise used), for the emissions that will be generated when the gas is burnt; and, operators of land-fill facilities, such as local councils. While the primary emissions targeted by the scheme are produced by burning fossil fuels, they also include emissions such as the methane released when coal is mined. The obligations include the option of surrendering carbon units for each tonne of emissions, however, if this optional step is not performed, the mandatory payment of a tax, which far exceeds the cost of a unit, is enforced. The Australian Government will sell carbon units at a fixed price for the first three years, starting at $23, after which units will be auctioned for between $15 and the expected international unit price, plus $20. The supply of domestic units will be unlimited for the three fixed price years, but will be subject to a reducing cap in following years, consistent with the Government policy of reducing Australia’s emissions. The Government has created a monopoly for the supply of units for the first three years by prohibiting the use of overseas-sourced carbon units, and by only allowing 5% of the unit surrender requirements to be comprised of Australian generated carbon credits. Thereafter, for the first five of the flexible-charge years, only half the units can be sourced from overseas, with any apparent saving likely to be offset by the various taxes and charges applicable to the use of those units. Certain fuels will also be separately taxed. Entities, however, which acquire, manufacture or import fuels and would otherwise be entitled to a fuel tax credit, may be able to assume direct liability thus enabling them to acquire or manufacture fuel, free of the carbon tax component. Where the imposts will cause competitive disadvantage to industries that compete with entities from other countries that do not have similar imposts, some assistance is provided in the form of allocated units provided at no charge. Assistance is also available to coal-fired electricity generators, producers of liquefied natural gas, operators of gassy coal mines, and the steel industry (not discussed in this paper). This paper also explains, in detail, how liability is created, how to determine which entities are liable, the means of assigning liability to other entities, and the assistance available to various industries to help deal with the financial impact of the scheme on their operations. It also outlines the key concepts that underpin the scheme.


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