Hydraulic balancing strategies: A case study of radiator-based central heating system

2018 ◽  
Vol 39 (3) ◽  
pp. 249-262 ◽  
Author(s):  
Edoardo A Piana ◽  
Benedetta Grassi ◽  
Francesco Bianchi ◽  
Cristian Pedrotti
Keyword(s):  
Distribution System ◽  
Heating System ◽  
Simple Calculation ◽  
Practical Application ◽  
Central Heating ◽  
Cost Impact ◽  
The Common ◽  
The Cost ◽  
The Impact

With energy efficiency regulations coming into force, the retrofitting of existing plants has become mandatory in many European countries. The application of thermostatic radiator valves is a cheap, effective solution in case of radiator-based hydronic plants, but it requires the distribution system to be re-engineered and, in some situations, further adjusting devices to be added. In this paper, the behaviour of a vertical distribution heating system has been simulated with the aim of analysing the outcome of different hydraulic balancing strategies and proposing a method to identify the most suitable option. The common problem of noisy valves has been examined and the cost impact of the different solutions has also been considered. Practical application: This paper applies simple calculation tools to explore the impact of different balancing solutions to a real building, using an approach that could valuably assist the practitioner in the decision process.

scholarly journals The economics of altruistic punishment and the maintenance of cooperation

2008 ◽  
Vol 275 (1637) ◽  
pp. 871-878 ◽  
Author(s):  
Martijn Egas ◽  
Arno Riedl
Keyword(s):  
Impact Analysis ◽  
Low Cost ◽  
Threshold Level ◽  
Altruistic Punishment ◽  
Cost Impact ◽  
The Social ◽  
Subject Pool ◽  
The Cost ◽  
The Impact ◽  
Cognitive Cost

Explaining the evolution and maintenance of cooperation among unrelated individuals is one of the fundamental problems in biology and the social sciences. Recent findings suggest that altruistic punishment is an important mechanism maintaining cooperation among humans. We experimentally explore the boundaries of altruistic punishment to maintain cooperation by varying both the cost and the impact of punishment, using an exceptionally extensive subject pool. Our results show that cooperation is only maintained if conditions for altruistic punishment are relatively favourable: low cost for the punisher and high impact on the punished. Our results indicate that punishment is strongly governed by its cost-to-impact ratio and that its effect on cooperation can be pinned down to one single variable: the threshold level of free-riding that goes unpunished. Additionally, actual pay-offs are the lowest when altruistic punishment maintains cooperation, because the pay-off destroyed through punishment exceeds the gains from increased cooperation. Our results are consistent with the interpretation that punishment decisions come from an amalgam of emotional response and cognitive cost–impact analysis and suggest that altruistic punishment alone can hardly maintain cooperation under multi-level natural selection. Uncovering the workings of altruistic punishment as has been done here is important because it helps predicting under which conditions altruistic punishment is expected to maintain cooperation.

scholarly journals Methodology for the Improvement of Large District Heating Networks

2012 ◽  
Vol 10 (1) ◽  
pp. 39-45 ◽  
Author(s):  
Anna Volkova ◽  
Vladislav Mashatin ◽  
Aleksander Hlebnikov ◽  
Andres Siirde
Keyword(s):  
Heat Generation ◽  
Large Scale ◽  
Renewable Energy Sources ◽  
District Heating ◽  
Heating System ◽  
District Heating System ◽  
Effective Operation ◽  
The Cost ◽  
Heating Networks

Abstract The purpose of this paper is to offer a methodology for the evaluation of large district heating networks. The methodology includes an analysis of heat generation and distribution based on the models created in the TERMIS and EnergyPro software Data from the large-scale Tallinn district heating system was used for the approbation of the proposed methodology as a basis of the case study. The effective operation of the district heating system, both at the stage of heat generation and heat distribution, can reduce the cost of heat supplied to the consumers. It can become an important factor for increasing the number of district heating consumers and demand for the heat load, which in turn will allow installing new cogeneration plants, using renewable energy sources and heat pump technologies

scholarly journals Estimating the Impact of Medical Innovation: A Case Study of HIV Antiretroviral Treatments

2008 ◽  
Vol 11 (2) ◽  
Author(s):  
Mark G Duggan ◽  
William N Evans
Keyword(s):  
Health Care ◽  
Good Alternative ◽  
Care Utilization ◽  
Short Term ◽  
Fda Approval ◽  
New Treatments ◽  
The Cost ◽  
The Impact ◽  
Average Health

As health care consumes a growing share of GDP, the demand for better evidence regarding the effects of health care treatments and how these vary across individuals is increasing. Estimating this with observational data is difficult given the endogeneity of treatment decisions. But because the random assignment clinical trials (RACTs) used in the FDA approval process only estimate average health effects and do not consider spending, there is no good alternative. In this study we use administrative data from California's Medicaid program to estimate the impact of HIV antiretroviral treatments (ARVs). We use data on health care utilization to proxy for health status and exploit the rapid takeup of ARVs following their FDA approval. Our estimate of a 68 percent average mortality rate reduction is in line with the results from RACTs. We also find that the ARVs lowered short-term health care spending by reducing expenditures on other categories of medical care. Combining these two effects we estimate the cost per life year saved at $19,000. Our results suggest an alternative method for estimating the real-world effects of new treatments that is especially well-suited to those treatments that diffuse rapidly following their approval.

scholarly journals Participating is more important than winning: the impact of socio-economic change on commoners' participation in eighteenth- and nineteenth-century Flanders

2010 ◽  
Vol 25 (3) ◽  
pp. 405-433 ◽  
Author(s):  
TINE DE MOOR
Keyword(s):  
Nineteenth Century ◽  
Resource Use ◽  
The Other ◽  
Willingness To Participate ◽  
Registration System ◽  
Regulatory Documents ◽  
The Common ◽  
The One ◽  
The Impact

ABSTRACTIn this article the participation profile of commoners of a Flemish case-study is reconstructed in order to identify their individual motivations for using the common, in some cases even becoming a manager of that common, in some cases only just claiming membership. Nominative linkages between membership lists, book-keeping accounts and regulatory documents of the common on the one hand and censuses and marriage acts on the other allow us to explain the behaviour of the commoners. It becomes clear why some decisions were taken – for example, to dissolve a well-functioning cattle-registration system – and how these affected the resource use of the common during the eighteenth and early nineteenth centuries. The analysis explains how internal shifts in power balances amongst groups of active users and those who did not have the means or willingness to participate could jeopardize the internal cohesion of the commoners as a group.

Impact of Residential and Public Charging Stations of Electric Vehicles on Distribution System by Stochastic Simulation

2015 ◽  
Vol 1092-1093 ◽  
pp. 375-380
Author(s):  
Suthida Ruayariyasub ◽  
Sompon Sirisumrannukul ◽  
Suksan Wangsatitwong
Keyword(s):  
Monte Carlo ◽  
Electric Vehicles ◽  
Distribution System ◽  
Stochastic Approach ◽  
Local Distribution ◽  
Battery Charging ◽  
Proposed Model ◽  
Charging Stations ◽  
The Impact

This paper investigates the impact of electric vehicles battery charging on the distribution system load if electric vehicles (EVs) are widespread used on roads. Stochastic approach based on a Monte Carlo method is developed in this study to simulate EVs charging load in two cases: 1) normal charge service at home, and 2) quick charge service at public charging stations. To demonstrate the model, a 22-kV distribution system of Pattaya City operated by Provincial Electricity Authority of Thailand (PEA) is employed in the case study. The results indicate the capability of the proposed model to exhibit the impact of EVs charging load on the local distribution system.

scholarly journals The Impact of Connecting Distributed Generation to the Distribution System

10.14311/986 ◽  
2007 ◽  
Vol 47 (4-5) ◽  
Author(s):  
E. V. Mgaya ◽  
Z. Müller
Keyword(s):  
Renewable Energy ◽  
Distributed Generation ◽  
Distribution System ◽  
Renewable Energy Sources ◽  
Electric Energy ◽  
Reducing Power ◽  
Effective Capacity ◽  
Voltage Profile ◽  
The Impact

This paper deals with the general problem of utilizing of renewable energy sources to generate electric energy. Recent advances in renewable energy power generation technologies, e.g., wind and photovoltaic (PV) technologies, have led to increased interest in the application of these generation devices as distributed generation (DG) units. This paper presents the results of an investigation into possible improvements in the system voltage profile and reduction of system losses when adding wind power DG (wind-DG) to a distribution system. Simulation results are given for a case study, and these show that properly sized wind DGs, placed at carefully selected sites near key distribution substations, could be very effective in improving the distribution system voltage profile and reducing power losses, and hence could  improve the effective capacity of the system. 

scholarly journals The Energy, Economic and Environmental Efficiency of a PV Installation Cooperating with a Heat Pumpin the Central Part of Europe. Case study

2020 ◽  
Author(s):  
Sylwia Wciślik ◽  
Dagmara Kotrys-Działak
Keyword(s):  
Net Present Value ◽  
Heating System ◽  
Ecological Effect ◽  
Solar Irradiation ◽  
Rate Of Return ◽  
Economic Potential ◽  
Internal Rate Of Return ◽  
Present Value ◽  
Central Heating

The paper addresses an analysis of the efficiency and profitability of the operation of a photovoltaic installation located in the geometric centre of Europe (near Białystok, Poland), where the intensity of solar irradiation is not too high compared to other European countries. It is calculated that in that place average solar irradiation being lower even by approx. 26 kWh than that for the whole Europe, which results in a 26% drop in the economic potential of the utilisation of solar energy for its conversion. A case study and an economic analysis show that without minimum funding amounting to 50% of the investment costs paid for the modernisation of a central heating system assisted by PV cells, the time of return of pecuniary expenditures exceeds 7 years. Apart from the Simple Pay-Back Time SPBT, discount indicators determined in the paper also include the net present value NPV and the internal rate of return IRR. Moreover, a direct ecological effect has been determined for such an investment.

scholarly journals Rooting out Poverty: People, Passion, and Place at Station 20 West

2019 ◽  
Vol 4 (2) ◽  
pp. 95-104
Author(s):  
Lisa Erickson ◽  
Isobel Findlay ◽  
Colleen Christopherson-Cote
Keyword(s):  
Inner City ◽  
Common Good ◽  
Poverty Reduction ◽  
Lessons Learned ◽  
Community Knowledge ◽  
Campus Engagement ◽  
The Common Good ◽  
The Common ◽  
The Impact

This case study summarizes and discusses our project exploring the impact of co-location, connectedness, and community-campus collaboration in addressing the root causes of poverty and our efforts to build capacities in Saskatoon. The site of this study is Station 20 West, a community enterprise centre in the heart of Saskatoon’s inner city that opened in the fall of 2012 as a result of community knowledge, participation, and determination to act for the common good. We share our findings, lessons learned, and project team reflections which underscore the connectedness of poverty reduction and reconciliation, the importance of including those with lived and diverse experience in community-campus engagement (CCE), and the hallmarks of good CCE.

scholarly journals THE IMPACT OF PRODUCT LIFE CYCLE TECHNIQUE IN REDUCING COSTS AND ACHIEVING SUSTAINABLE DEVELOPMENT GOALS, A CASE STUDY IN THE RUSTAN STEEL STRUCTURE PRODUCTION COMPANY IN ERBIL

2021 ◽  
Vol 03 (07) ◽  
pp. 314-328
Author(s):  
Ghazi Abdulazeez SULAIMAN BAG ◽  
Rafiq Faraj MAHMOOD
Keyword(s):  
Corporate Governance ◽  
Life Cycle ◽  
Life Cycle Cost ◽  
Product Life Cycle ◽  
Steel Structures ◽  
Product Life ◽  
Technical Requirements ◽  
The Cost ◽  
The Impact

This research was - case study in Rstin company for the steel structures in Erbil- addressed the cost technique of product life cycle, as discussed the kinds, relevance and the stages of the life cycle of the product, also it referred to the corporate governance of discussing its inception the concept and importance of the principles, objectives, and mechanisms was addressed to the technical aspects of the overlap between the cost of the product life cycle corporate governance and show the appropriate techniques used in each stage of the life cycle of the product and how it achieved by a reduction of costs. The result of this study indicates that the integration between the product life cycle cost and corporate governance works on reduce costs through the various stages of product life cycle. It also concluded that this integration increases the company ability to compete in market which leads to rise in its market share and eventually lead to maximize the profit which has been achieved through the optimal use of a company available resources. It also found that the techniques of life cycle cost of the product cannot be applied without support of the company directors, throughout the technical requirements of the application. Corporate governance ensures directors of the company to utilize firm resources which makes the company to achieve several stakeholders' objectives.

scholarly journals Simulating the impact of fertiliser strategies and prices on the economics of developing and managing the Cicerone Project farmlets under climatic uncertainty

2013 ◽  
Vol 53 (8) ◽  
pp. 806 ◽  
Author(s):  
Karl Behrendt ◽  
James M. Scott ◽  
Oscar Cacho ◽  
Randall Jones
Keyword(s):  
Soil Fertility ◽  
Stocking Rate ◽  
High Rainfall ◽  
Efficient Management ◽  
Fertiliser Application ◽  
The Cost ◽  
The Impact ◽  
Stocking Rates ◽  
Future Management

The application of fertilisers to pastures in the high rainfall regions of southern Australia has contributed to large increases in carrying capacity following the widespread adoption of the practice since the late 1940s. Recently, large shifts in the worldwide demand for fertiliser inputs have lead to large rises in the cost of fertiliser inputs. These increasing costs have significant potential ramifications on the future management of soil fertility and its interaction with the persistence and profitability of sown pastures, especially during periods of climatic uncertainty. A dynamic pasture resource development simulation model was used to investigate the implications of fertiliser rates and costs on the efficient management of soil fertility under climatic uncertainty. The framework also allowed the investigation of how the management of soil fertility interacts with the utilisation of pasture resources through different stocking rates. In the application of this method to the Cicerone Project farmlets case study, fertiliser input costs were found to influence the optimal combination of fertiliser inputs and stocking rate. Analyses of the dynamic interaction between fertiliser application and cost, stocking rate and the persistence of desirable species enabled the identification of the most risk-efficient strategies. The implications for grazing industries in the high rainfall regions of southern Australia are discussed.

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