scholarly journals The evaluation of energy saving performance for the modular design centrifugal chiller

2019 ◽  
Vol 111 ◽  
pp. 01018
Author(s):  
YoonJei Hwang ◽  
HanYoung Park ◽  
SaiKee Oh ◽  
HoRim Lee ◽  
YoungSu Park ◽  
...  
Keyword(s):  
Modular Design ◽  
Load Condition ◽  
Manufacturing Cost ◽  
Concept Design ◽  
Full Load ◽  
Modular Concept ◽  
Operation Algorithm ◽  
Centrifugal Chiller ◽  
Major Cycle ◽  
Cycle Efficiency

The modular concept design and operation of a centrifugal chiller offers the potential of increased cycle efficiency both at full load and off load conditions compared to the single compressor chiller. Modular chiller design is that a smaller, individual chiller can be connected with another, to make a larger capacity system. In the case of a tandem chiller, there would be faced to the higher initial cost or bigger foot print than a single compressor chiller at the same capacity because manufacturing cost, weight and size will be decreased according to increase of the refrigeration capacity. Therefore, it is obvious that a modular chiller have to be improved its efficiency first by both the operation algorithm and major cycle components. Eventually, the efficiency of the modular chiller achieves up to 6% at the full load condition after added series counter flow effect as much as 3% and more 3% added by improved aerodynamic design for impeller. Moreover, maximize off design potential through the capacity combination algorithm as the way of uneven loading makes 24% improved based on AHRI 550/590.

scholarly journals A modular design method based on TRIZ and AD and its application to cutter changing robot

2021 ◽  
Vol 13 (7) ◽  
pp. 168781402110343
Author(s):  
Mei Yang ◽  
Yimin Xia ◽  
Lianhui Jia ◽  
Dujuan Wang ◽  
Zhiyong Ji
Keyword(s):  
Modular Design ◽  
Design Method ◽  
Idea Generation ◽  
Design Parameters ◽  
Problem Analysis ◽  
Concept Design ◽  
Functional Requirements ◽  
Shield Tunneling ◽  
Structural Hierarchy ◽  
And Performance

Modular design, Axiomatic design (AD) and Theory of inventive problem solving (TRIZ) have been increasingly popularized in concept design of modern mechanical product. Each method has their own advantages and drawbacks. The benefit of modular design is reducing the product design period, and AD has the capability of problem analysis, while TRIZ’s expertise is innovative idea generation. According to the complementarity of these three approaches, an innovative and systematic methodology is proposed to design big complex mechanical system. Firstly, the module partition is executed based on scenario decomposition. Then, the behavior attributes of modules are listed to find the design contradiction, including motion form, spatial constraints, and performance requirements. TRIZ tools are employed to deal with the contradictions between behavior attributes. The decomposition and mapping of functional requirements and design parameters are carried out to construct the structural hierarchy of each module. Then, modules are integrated considering the connections between each other. Finally, the operation steps in application scenario are designed in temporal and spatial dimensions. Design of cutter changing robot for shield tunneling machine is taken as an example to validate the feasibility and effectiveness of the proposed method.

scholarly journals ADDITION OF HYDROFOIL TO SHIP RESISTANCE ANALYSIS ON HALASAN CLASS BASED ON VALIDATION TEST RESULT

JOURNAL ASRO ◽  
2019 ◽  
Vol 10 (3) ◽  
pp. 105
Author(s):  
Sutrisno Sutrisno ◽  
Wawan Kusdiana ◽  
Ayip Rivai Prabowo ◽  
Muhammad Askhuri
Keyword(s):  
Surface Area ◽  
Load Condition ◽  
Maximum Speed ◽  
Main Function ◽  
Full Load ◽  
Ship Resistance ◽  
Validation Test ◽  
Hit And Run ◽  
Wet Surface ◽  
Test Result

KRI Halasan - 630 is one of the Fast Missile warships with a length of 60 Meters which apart of fast patrol boat class which belongs to TNI-AL. Accordance with the main function not only as a fast missile boat but also as a patrol ship killer, this ship was made to have a high ability in “hit and run”. Since the beginning of the manufacture and after being inaugurated as KRI in 2014 this ship is able to reach speed until 27 knot in full load. As time goes on the same conditions the speed that this ship can achieve is 25 knot at maximum speed. This can be caused by increase in value from the resistance of the ship. One way to reduce the value of the resistance of the ship is to minimize the Wet Surface Area(WSA) from the ship. By adding hydrofoil technology will produce lift force which could lift apart of the hull ship from the water so that Wet Surface Area from the ship will reduce. From the calculation, to lift on the hull of KRI Halasan Class 20 cm in full load condition at 25 knot knows that dimension for fore foil with tapered straight type are wingspan 4,6 m, wingroot 1,33 m, wingtip 0,5 m, and swept angle 11°. And dimension for aft foil with rectangular straight type are wingspan 5,3 m, wingroot and wingtip 1,365 m, and swept angle 0°. The ship resistance with hydrofoil is 265,5 KN, while in the same condition and speed from the ship without hydrofoil the value of ship resistance is 267 KN. By adding hydrofoil technology could reduce the ship resistance 1,5 KN. This values could make 19,29 KW or 25,86 Hp in power saving.Keywords : Hydrofoil technology, Ship Resistance, Halasan Class

The Emission Performance Research and Analysis of Diesel Engine Fueled with Biodiesel Hybrid Fuel

2012 ◽  
Vol 610-613 ◽  
pp. 1501-1504
Author(s):  
Gui Fu Wu ◽  
Ji Yi Luan ◽  
Yuan Hua Jia ◽  
Dong Hua Jiang
Keyword(s):  
Diesel Engine ◽  
Fuel Consumption ◽  
Diesel Fuel ◽  
Load Condition ◽  
Biodiesel Fuel ◽  
Smoke Emission ◽  
Emission Performance ◽  
Full Load ◽  
Consumption Ratio ◽  
Performance Research

Biodiesel can be made from the esterification with plant or animal fat.It has been being paid more and more attention for its characteristics of non-sulphur, non-arene,higher hexadecane and biodegradablity and renewablity Biodiesel is similar to No.0 diesel in characteristics,so it can be applied to engines directly without changing the structure.This article shows the emission performance of diesel mixed with biodiesel fuel which in different proportion,and its CO, HC and smoking exhaust have been decreased greatly,then NOx increase slightly,while the fuel-consumption ratio remains stable(when on full load condition,5%, 15% and25% of hybrid fuel compared with pure diesel fuel,HC emission decreases by 15%,33.3% and 83.3%,and carbon smoke emission decreases by 16.25%,51.8% and 63.6%).

The Research of System Design on a Turbine Based on CATIA

2014 ◽  
Vol 602-605 ◽  
pp. 743-746
Author(s):  
Dong Dong Xu ◽  
Tong Wang
Keyword(s):  
System Design ◽  
Modular Design ◽  
Technology Development ◽  
Rapid Development ◽  
Optimal Solution ◽  
Practical Significance ◽  
Modern Theory ◽  
Concept Design ◽  
Product System ◽  
Complex Product

With the rapid development of science and technology, modern design has become increasingly complex, with the factors needed to be considered more various, find the optimal solution to solve problems, which is the real meaning of product design. In this paper, by analyzing the domestic and foreign research present situation of the modern theory of the modular design, according to the characteristics of complex product system, it will be introduced to the concept design of complex product system modular design, proposed in view of the function of the turbine division method, based on CATIA software research and development of the system design of a turbine, that can effectively shorten the development time, reduce development costs, to lay a good foundation for its innovation, having great theoretical and practical significance for turbine technology development.

Effects of partial addition of n-butanol in rubber seed oil methyl ester powered diesel engine

2017 ◽  
Vol 231 (7) ◽  
pp. 607-617 ◽  
Author(s):  
Vishal V Patil ◽  
Ranjit S Patil
Keyword(s):  
Diesel Engine ◽  
Methyl Ester ◽  
Seed Oil ◽  
Load Condition ◽  
Rubber Seed Oil ◽  
Volume Percentage ◽  
Rubber Seed ◽  
Performance And Emission ◽  
Full Load ◽  
Hc Emissions

The objective of present study is to evaluate the combustion, performance, and emission characteristics of refined biodiesel (biofuel) such as rubber seed oil methyl ester with the partial addition of n-butanol (butanol) in it in a single cylinder four stroke diesel engine operated at a constant speed of 1500 rpm. Various characteristics of butanol–rubber seed oil methyl ester blends with varying volume percentage of butanol such as 5, 10, 15, and 20 in butanol–rubber seed oil methyl ester blends were compared with the characteristics of neat rubber seed oil methyl ester (100%) and neat diesel (100%) at various load conditions on engine (such as 0%, 25%, 50%, 75%, and 100%) for the compression ratio 18. It is found that brake specific fuel consumption was increased by 17% with an increase in butanol content from 5% to 20% in butanol–rubber seed oil methyl ester blends at full load condition. Brake thermal efficiency was decreased by 14% with an increase in butanol content from 5% to 20% in butanol–rubber seed oil methyl ester blends at full load condition. Carbon monoxide and HC emissions were found to be negligible, i.e. less than 0.1% and 35 ppm, respectively, for all selected fuels. NOx emissions were decreased by 10% with an increase in butanol content from 5% to 20% in butanol–rubber seed oil methyl ester blends at full load condition. Various characteristics were compared for six fuels (neat rubber seed oil methyl ester, four renewable butanol–rubber seed oil methyl ester blends, and neat diesel) in order to finalize the promising alternate sustainable renewable fuel in place of shortly diminishing conventional diesel fuel in order to provide the solution for increase in demand and price of conventional fuel (diesel) for power generation and to reduce the serious issues concerned with environmental pollution due to usage of neat diesel.

Next Generation Hull-Platform “Noah-FPSO Hull” Based on Modular Design and Construction Concept

2017 ◽  
Author(s):  
Shigeru Tanaka ◽  
Kotaro Takano
Keyword(s):  
Modular Design ◽  
Geographical Location ◽  
Oil Field ◽  
Next Generation ◽  
Module Design ◽  
Modular Concept ◽  
Standard Design ◽  
Hull Design ◽  
Offshore Oil ◽  
Design And Construction

It is often said that every offshore oil field has its own environmental condition and oil property according to its geographical location. This means that it is very difficult to apply a specific standard design to any FPSO hull, which is usually preferred by many shipyards. This fact often leads to serious trouble for FPSO hull construction in terms of cost and delivery time. In order to cope with this problem, Mitsui Engineering and Shipbuilding Co., Ltd. (MES) developed a next generation offshore platform for FPSO, “Mitsui noah-FPSO Hull” (noah : New Offshore Adapted Hull), which consists of unique modular design and construction concept and simple hull form. Structural design is also modularized, i.e. common cross section and frame space, will facilitate to standardized topside module design. In fact, it can be constructed even in multi-shipyards as a consistent cross-platform. MES has obtained Approval In Principle (AIP) for the noah-FPSO Hull design and concept from American Bureau of Shipping (ABS) and Bureau Veritas (BV). In this paper, MES introduces these modular concept of the noah-FPSO Hull and its developed technical issues.

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