scholarly journals Economic aspects in the design process of heat recovery installations - case study

2019 ◽  
Vol 20 (1-2) ◽  
pp. 340-343
Author(s):  
Zbigniew Stempnakowski ◽  
Piotr Nikończuk
Keyword(s):  
Energy Efficiency ◽  
Heat Recovery ◽  
Geographical Location ◽  
Economic Benefits ◽  
Economic Aspects ◽  
Recovery Unit ◽  
Proposed Model ◽  
Spray Booth ◽  
The Cost

The paper presents a proposal of economic aspects application in the process of optimizing the construction of heat recovery unit. The proposed model includes the cost of heat exchanger installation and the predicted economic benefits during the operation of the device. The predicted benefits include an increase of energy efficiency resulting from the number of modules of heat recovery unit, decrease unit efficiency during operation, the cost of heat production, average temperatures in the geographical location and working time. A case study was carried out on the example of a spray booth.

High Level Heat Recovery in Coal and Coke Gasification Combined Cycle Systems

1995 ◽  
Author(s):  
Uday Mahagaokar ◽  
Egon L. Doering
Keyword(s):  
Petroleum Coke ◽  
Heat Recovery ◽  
High Efficiency ◽  
Economic Benefits ◽  
Combined Cycle ◽  
Level Energy ◽  
Water Quench ◽  
Cycle Systems ◽  
High Level ◽  
The Cost

Integrated coal gasification combined cycle systems offer a very efficient and environmentally superior method for converting coal or petroleum coke to electric power. The high efficiency is derived from effective utilization of high level energy in all parts of the IGCC system. Entrained flow gasification represents one of the cleanest and most efficient technologies for converting coal or coke to syngas, and also produces significant quantities of high level sensible heat in the raw syngas exiting the gasifier. This heat can be recovered as high pressure steam through the use of syngas coolers. Alternatively, the syngas cooler capital may be saved by using a water quench at the expense of heat recovery. This paper examines the economic benefits of heat recovery in a syngas cooler relative to water quench by determining the value of the recovered energy versus the cost of recovery. The results show that for power generation in a gasification combined cycle configuration, the cost of syngas cooling is justified by the value of the energy recovered — this applies not only to coal feeds but also to low-priced feeds like petroleum coke.

A novel model for risk management of outsourced construction projects using decision-making methods: a case study

2020 ◽  
Vol 10 (2) ◽  
pp. 97-123 ◽  
Author(s):  
Amin Mahmoudi ◽  
Mehdi Abbasi ◽  
Xiaopeng Deng ◽  
Muhammad Ikram ◽  
Salman Yeganeh
Keyword(s):  
Decision Making ◽  
Construction Projects ◽  
Project Managers ◽  
Analytic Hierarchy ◽  
Suitable Alternative ◽  
Content Type ◽  
Proposed Model ◽  
The Cost ◽  
First Time

PurposeSelecting a suitable contract to outsource construction projects is an ongoing concern for project managers and organizational directors. This study aims to propose a comprehensive model to manage the risks of outsourced construction project contracts.Design/methodology/approachTo employ the proposed model, firstly, the types of contracts and risks in the organization should be identified, then, to prioritize the contracts, the identified risks are considered as criteria. After receiving the experts' opinions, the best–worst method (BWM) integrated with grey relation analysis (GRA) method was used to prioritize the contracts. BWM and GRA are multi-criteria decision-making methods with different approaches and applications. In the current study, BWM has been employed to calculate the weights of criteria because it has better performance than other methods such as the analytic hierarchy process (AHP). After calculating the weights of criteria, the GRA method has been utilized for ranking the alternatives.FindingsAccording to the results obtained from the case study, the cost plus award fee contract is the most suitable alternative for outsourcing construction projects. The proposed methodology can be practically applied through different types of the projects such as construction or “engineering, procurement and construction”.Originality/valueTo the best of our knowledge, this is the first time a conceptual model has been proposed to select an appropriate contract for construction projects. Also, for the first time, the BWM integrated with GRA method has been used to prioritize project contracts based on the potential risks. The proposed model can contribute to project managers for selecting a suitable contract with the least risk in construction projects.

scholarly journals Urban Commercial Spatial Structure Optimization in the Metropolitan Area of Beijing: A Microscopic Perspective

2019 ◽  
Vol 11 (4) ◽  
pp. 1103
Author(s):  
Fang Wang ◽  
Fang-qu Niu
Keyword(s):  
Spatial Distribution ◽  
Spatial Structure ◽  
Large Population ◽  
Economic Benefits ◽  
Downtown Area ◽  
Commercial Activities ◽  
Proposed Model ◽  
Distribution Features ◽  
Voronoi Method

Urban commercial districts (UCDs) are the concentrated areas for commercial activities in a city, which provide shopping, leisure, business, and other functions. Urban planners usually face problems in how to plan and design UCDs. The layout of UCDs should not only be appropriately concentrated to realize economic benefits, but should also be properly dispersed to accommodate the distribution of the population. Using Beijing as a case study, this study conducted research into UCDs from a microscopic perspective by utilizing open source big data. A recognition and classification method of UCDs was proposed based on the data of POI and road networks. The proposed model combines Huff’s model and the Voronoi method to analyze how various UCDs should be distributed within a city according to the spatial pattern of the population. The results showed that different kinds of UCDs had different spatial distribution features. Problems were also found, for example, UCDs on the urban outskirts served a large population; there were limitations to the spatial distribution of UCDs in the downtown area; and there was incongruity between the UCD types and the population layout. Based on these findings, suggestions regarding the optimization of the urban commercial spatial structure were also put forward.

scholarly journals On the Use of Importance Measures in the Reliability of Inventory Systems, Considering the Cost

2020 ◽  
Vol 10 (21) ◽  
pp. 7942
Author(s):  
Liwei Chen ◽  
Meng Kou ◽  
Songwei Wang
Keyword(s):  
Inventory Control ◽  
Inventory Management ◽  
Inventory Systems ◽  
Optimization Analysis ◽  
Proposed Model ◽  
Important Approach ◽  
Total Inventory ◽  
Inventory Control Model ◽  
The Cost

In order to maximize inventory benefits or minimize costs, reliability and cost of inventory control models need to be identified and analyzed. These importance measures are one important approach to recognize and evaluate system weaknesses. However, importance measures have fewer applications in inventory systems’ reliability. Considering the cost, this paper mainly discusses the reliability change of performance parameters with the importance measures in inventory systems. The calculation methods of differential importance and Birnbaum importance are studied in the inventory control model with shortages. By comparing the importance values of various parameters in the model, the optimization analysis of the inventory model can be used to identify the key parameters, so as to effectively reduce the total inventory cost. The importance order and the identification of key parameters are helpful to increase the operational efficiency of the inventory control and provide effective methods for improving the inventory management. Lastly, a case study with a shortage and limited inventory capacity is used to demonstrate the proposed model.

scholarly journals Variable and differential application of nutrients to a hill country farm

2017 ◽  
Vol 79 ◽  
pp. 119-123
Author(s):  
Jd Morton ◽  
A. Gillingham
Keyword(s):  
Financial Analysis ◽  
Economic Benefits ◽  
Early Spring ◽  
Late Winter ◽  
Variable Rate ◽  
Hill Country ◽  
Uniform Rate ◽  
The Cost ◽  
The Hill

Abstract Traditionally fertiliser has been aerially applied at a uniform rate to hill country, but the technology now exists to apply nutrients at a variable rate (VR) and each nutrient differentially, depending on the production potential and pasture composition of each part of the hill. A hypothetical case study of a sheep farm was modelled to show the economic benefits of VR application of phosphorus (P) and sulphur (S) and differential application of nitrogen (N), compared with application of a uniform rate of P and S. The financial analysis demonstrates that the VR strategy of less P and S to steeper slopes where there is low legume and more on easier slopes where there is more legume, costs less than the application of P and S at a uniform rate over all slopes. The cost saving could be used to apply N to steep land on both sunny and shady aspects and easy land on sunny aspects. This differential N application in late winter/early spring ensures better pasture cover for lactating ewes to improve ewe condition at weaning. When this gain in condition was maintained through to mating, lambing percentage increased in the following spring. The benefit from this increased lamb production was an increase in financial returns of $63/ha/year. A qualitative sensitivity analysis indicated that this value remains stable in response to changes in the proportion of each slope class, soil Olsen P level, the relative cost of fertiliser P and N and sheep to cattle ratio. Keywords: differential application, hill country, lamb production, nitrogen, phosphorus, aerial topdressing, variable rate

scholarly journals Optimal Alternatives by Controlling Time and Cost of a Multi-Level Car Park Using Excel-Solver Program

2019 ◽  
Vol 54 (6) ◽  
Author(s):  
Sada Abdalkhaliq Hasan
Keyword(s):  
Optimal Solution ◽  
Time Frame ◽  
Proposed Model ◽  
Car Park ◽  
Overall Performance ◽  
Multi Level ◽  
Excel Solver ◽  
The Cost ◽  
The City

In this research the best cost and time are identified to implement a multi-level car park. The aim of this research is to develop a time frame model, including time and cost analysis, and to find optimal alternatives for a multi-level garage project during the planning phase. The proposed model has been developed using Solver program in Excel built for combining cost and time calculations by adopting the Project Management Software (MS-Project) to facilitate optimal solution access. In future the same project can be implemented at the lowest possible cost. This research concluded that it is possible to obtain the optimal solution after analyzing the alternatives using the Solver program and then taking the results of the optimization process to perform the improvement of the timeline. The research highlights the factors such as: the estimated cost, the planned time and the alternatives available for optimum performance aimed at finding optimal solutions and thus enhancing overall performance. The research was applied to the case study of one of the projects implemented within the city and found that the results are consistent with the research objective. According application of the model, the solution shows it will reduce cost and time to about 190292 $ and 91day from the cost and time of actual project.

Determination of the Optimal Number of Suppliers Considering the Risk: Emersun Company as a Case Study

2012 ◽  
Vol 433-440 ◽  
pp. 5873-5880 ◽  
Author(s):  
Nasim Mirahmadi ◽  
Esmaeel Saberi ◽  
Ebrahim Teimoury
Keyword(s):  
Supply Chain ◽  
Optimal Number ◽  
Development Cost ◽  
Supply Risk ◽  
Proposed Model ◽  
Management Area ◽  
The Cost ◽  
Tree Approach

Determining the number of suppliers chosen for cooperation in a supply chain is one of the most important problems in the supply chain management area. Regarding the fact that simultaneously decreasing the risk and cost is one of the most important objectives of every organization, besides the cost, the risk has also been introduced in the recent researches, as one of the most important criteria. In this paper, the decision tree approach is used for determining the optimal number of suppliers considering the supply risk and it has been tried to develop an applied method through expanding the cost criteria. The proposed model in this paper, therefore, contains any kind of cost ingredients such as cost of suppliers development, cost of suppliers management, cost of missing discount in volume due to increase in number of suppliers in supply base, and loss cost due to supply postponement from suppliers. This approach is implemented in Emersun Company.

Newly designed superheated steam dryer bearing heat recovery unit: Analysis of energy efficiency and kinetics of Kelp drying

2018 ◽  
Vol 36 (13) ◽  
pp. 1619-1630 ◽  
Author(s):  
Zhen Jia ◽  
Binxiong Liu ◽  
Changcheng Li ◽  
Ting Fang ◽  
Jinquan Chen
Keyword(s):  
Energy Efficiency ◽  
Heat Recovery ◽  
Superheated Steam ◽  
Recovery Unit ◽  
Kinetics Of ◽  
Unit Analysis
Sign in / Sign up

Export Citation Format

Share Document