Design pattern
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Don't reinvent the wheel. Design pattern is a collection of well tested solution of common problem in context of software engineering.
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(3) The power requirement.
(4) The paddle configuration.
1. Monthly alum requirement:
40 mg/L x Q x time = _______________________ kg/month
2. Basin dimension:
(a) Calculate detention time
Then Gt = 4 x 104
t = 4 x 104 / G x (1 min/60 s) = __________________ min.
(b) Volume of tank is
V = Qt = 50,000 (m3/d) x t = _____________________ m3
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should be square, i.e., depth equals 1/3 length. Assuming maximum depth of 5 m, length is:
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3. Power requirements:
(a) Assume G value tapered as follows: (remember, the average of all three must be what you
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First compartment, G = ________________ s-1
Second Compartment, G = ________________ s-1
Third compartment, G = ________________ s-1
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P2 = _____________ W = _______________ kW
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Designing a Flocculator: A water treatment plant is being designed to process 50,000 m3/d of
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flocculation at a Gt value of 4.0 x 104 produces optimal results at the expected water
temperatures of 15o C. Assume the average G value is 30 s-1.
Determine:
(1) The monthly alum requirement in kg/month
(2) The flocculation basin dimensions if three cross-flow horizontal paddles are to used. The
flocculator should be a maximum of 12 m wide and 5 m deep in order to connect appropriately
with the settling basin.
(3) The power requirement.
(4) The paddle configuration.
1. Monthly alum requirement:
40 mg/L x Q x time = _______________________ kg/month
2. Basin dimension:
(a) Calculate detention time
Then Gt = 4 x 104
t = 4 x 104 / G x (1 min/60 s) = __________________ min.
(b) Volume of tank is
V = Qt = 50,000 (m3/d) x t = _____________________ m3
(c) The tank will contain three cross-flow paddles so it length will be divided into three
compartments. For equal distribution of velocity gradients, the end area of each compartment
should be square, i.e., depth equals 1/3 length. Assuming maximum depth of 5 m, length is:
3 x d = _______________ m
Width is d x L x w = V
W = _________________ m
(d) Draw the configuration of the tanks with paddles:
3. Power requirements:
(a) Assume G value tapered as follows: (remember, the average of all three must be what you
assumed earlier)
First compartment, G = ________________ s-1
Second Compartment, G = ________________ s-1
Third compartment, G = ________________ s-1
(b) Power requirement for compartment 1, 2 and 3
P = G2 V m
Where Vcompartment = V/ 3 = _______________________ m3
At 15o C m = ___________________ Pa*s or N*s/m2
P1 = _____________ W = _______________ kW
P2 = _____________ W = _______________ kW
P3 = _____________ W = _______________ kW
4. Paddle configuration
(a) Assume each paddle has four boards 2.5 m long and w wide. There are three paddle wheels
per compartment.
(b) Calculate width of paddle (w) from power input and paddle velocity:
At 15o C, r = ___________________ kg/m3 (Table A-1)
assume paddle velocity in the middle of design range (above) = _______________ m/s
CD = __________________ (reference table above)
Ap = length of boards x (w) x number of boards
3 paddles at ________________ boards per paddle = ______________
boards
Ap = ____________ boards x 2.5 m (length) x (w)
P (in terms of (w)) = _________________________
Set equal to average power found above:
Solve for width of paddle:
w = ________________ m
Solution
1. Quantity of water to be processed for a month, Q= 50,000 m3/day x 30 days
= 1,500,000 m3
= 1,500 L
Monthly alum dosage required = 40 mg/L x 1500 L = 60,000 mg
= 60 kg
2. a) Gt = 4 x 104
G=30 s-1
Retention time required = Gt/G
= (4 x 104)/30
= 1333.33 seconds = 22.22 mints
b) Quantity of water to be processed, Q= 50,000 m3/day
= 34.72 m3/min
Volume of the tank should be, V = Q x retention time, t.
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In this talk, we discuss how to break away from bad development practices and how to address significant gaps in your legacy and current systems. We look at ways to lead by example successfully and introduce refactoring culture into your team and organization. We cover tips and tricks that help improve the development culture and emphasize the codebase's general health.
DSL development
The document discusses best practices for developing domain-specific languages (DSLs). It recommends adopting existing domain expert notations rather than inventing new ones, using domain jargon, and designing only what is necessary. It also stresses the importance of understanding the current development process, establishing close ties with domain experts, and not expecting users to forgive design mistakes.
Lecture11 A Image
The document discusses various aspects of web design including:
- Design is about solving problems for users, not about the designer.
- There is a debate between prioritizing style over content or vice versa. Large organizations have rules around content and presentation.
- Web design is different than print design due to aspects like scrolling, resizing, and grid-based layouts. But there are also similarities like visual hierarchy and flow of information.
- Key principles of web design include usability, navigation, consistency, hierarchy, and maintainability. Usability should be the top priority. Form should follow function.
Unit 1_ preliminary Concepts_session 1.pptx
The document discusses key concepts in programming languages including:
- Reasons for studying programming language concepts such as choosing appropriate languages and learning new languages.
- Factors that influence language design such as implementation methods and programming environments.
- Syntax and semantics including formal methods for describing syntax and meanings of programs.
Hs engineering engineering dvc
The document outlines the engineering design process as a 5-step iterative process:
1) Define the problem by identifying needs, gathering requirements, and establishing functional specifications.
2) Gather pertinent information through research and market surveys.
3) Generate multiple potential solutions.
4) Analyze and select the best solution based on criteria like cost and safety.
5) Test and implement the selected solution through prototyping and further refinement.
The process is not always linear and may require revisiting earlier steps as solutions are developed and tested.
Invision Design Systems Handbook
A design system unites product teams around a common visual language to reduce design debt and accelerate the design process. The document provides a step-by-step guide for creating a design system, beginning with assembling a cross-functional team from design, development, accessibility, content, research, and leadership. It also discusses different team models for managing the design system, such as a solitary overseer, centralized team, or federated model with members from various teams. The goal is to establish the right people and processes to develop design standards and reusable components that can be combined to build interfaces quickly.
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Design pattern
- 1. LIGHTS WILL GUIDE YOU DESIGN PATTERN Samuel Dicksy @ 2017
- 2. AGENDA Common Problems Design Pattern History What is Design Pattern Why Design Pattern Classification of Design Pattern 1 2 3 4 5
- 3. 3 COMMON PROBLEMS The bigger a software is built the more complex the source codes
- 5. 5 COMMON PROBLEMS A bad design can lead us to be Spaghetti Code
- 6. 6 DESIGN PATTERN HISTORY 1977 1994 1987 Architectural Concept A Pattern Language Design Pattern by GOF
- 7. 7 WHAT IS DESIGN PATTERN Give it a name 1 2 3
- 8. 8 WHAT IS DESIGN PATTERN Give it a name
- 9. 9 WHAT IS SOFTWARE DESIGN PATTERN a software design pattern is a general reusable solution to a commonly occurring problem within a given context in software design https://en.wikipedia.org/wiki/Software_design_pattern Software Design Pattern is a collection of named solutions for common problems in the context of software engineering
- 10. 10 WHY DESIGN PATTERN Don’t reinvent the wheel.
- 11. 11 WHY DESIGN PATTERN Patterns are accumulations of experience Thus reducing the technical risks Design Pattern is well tested Common Vocabulary Thus making communication more efficient http://janjiss.com/3-reasons-why-design-patterns-matter/ 1 2 3
- 12. 12 CLASSIFICATION OF DESIGN PATTERN Structural Pattern How to build relationship between entity (Adapter, Bridge, Decorator, etc) Creational Pattern Deal with object creational (Singleton, Factory, Lazy, etc) Behavioral Pattern Communication between objects (Observer, Iterator, Chain of Responsibility, etc) Architectural Pattern High level pattern (MVC, n-tier, client-server, peer-to-peer, etc) 1 2 3 4