Design Constraints

DESIGN CONSTRAINTS

  • Definition of Engineering Design

    • A process aimed at creating systems, components, or processes that satisfy specified needs within constraints.
    • It involves a creative and iterative decision-making process, applying sciences and mathematics to transform resources into solutions.

  • Iterative Process

    • Engineering design requires identifying needs, developing requirements, analyzing solutions, generating multiple solutions, and evaluating them against requirements.
    • Consideration of risks and trade-offs is essential to achieve high-quality solutions.

CAPSTONE DESIGN PROJECT

  • Objective
    • Culminating design experience aimed at preparing senior students for practical engineering.
  • Key Features
    • Undertaken over two semesters.
    • Usually collaborative and multidisciplinary, involving aspects of plant and product design.

COMPONENTS OF CAPSTONE PLANT DESIGN PROJECT

  • Detailed components included in the project:
    • Project description/rationale
    • Market study
    • Economic analysis (cost estimation, profitability)
    • Environmental impact assessment
    • Hazard and operability study
    • Equipment and instrumentation design, process design.

DESIGN CONSTRAINTS

Economic Factors

  • Profitability
    • Economic constraints are paramount; designs must ensure plants are profitable.

Environmental and Societal Impacts

  • Consideration for air and water pollution, waste generation, and socio-economic effects on communities.
  • Designs must minimize environmental impact and comply with regulations.

Legal and Ethical Considerations

  • Necessity to comply with government regulations concerning safety, environmental protection, and ethical standards in engineering practices.

COSTS AND PROFITABILITY

  • Understanding available capital, production costs (raw materials, labor, utilities), and potential cash flows are critical in determining the viability of projects.

GOVERNMENT REGULATIONS AND LAWS

  • Solid Waste Management

    • Compliance with laws such as R.A. 9003 for waste management practices in the operational context of plants.

  • Noise and Emission Standards

    • Adherence to noise standards specified by the Department of Environment and Natural Resources (DENR-EMB) for different times of the day.

PROCESS SAFETY AND RELIABILITY

  • Design must ensure public safety, worker safety, and safe materials handling, incorporating safety features within control systems.

HAZARDS IDENTIFICATION

  • Importance of assessing potential safety concerns relevant to the materials and chemicals used in processes, referencing Material Safety Data Sheets (MSDS).

INSTRUMENTATION AND CONTROLS

  • Essential for maintaining safe and reliable operations in industrial processes. Safety devices must also be in place to prevent accidents and ensure compliance with legislation.

MANUFACTURABILITY AND SUSTAINABILITY

  • Factors influencing design decisions:
    • Raw material supply, equipment sizes, maintenance, and overall manufacturability of the design.

PLANT LAYOUT

  • Effective layout must consider operational flows, safety regulations, equipment maintainability, and inspection needs. Standard spacing recommendations for various plant components should be followed.

ETHICAL ISSUES

  • Engineering designs must align with applicable ethical codes. Compliance with ethical standards ensures designs are viable and safety-conscious.

USE OF PROCESS SIMULATION SOFTWARES

  • Various tools such as Aspen Plus, CHEMCAD, and HYSYS are utilized for both steady-state and dynamic process simulations to facilitate design and analysis.

REFERENCES

  • Reference materials provide guidance on engineering standards and ethical considerations essential in design projects. Links to industry documentation and scholarly articles contribute to deeper understanding and implementation of best practices in engineering design.