HVAC DESIGN MANUAL - A MECHANICAL DESIGNER GUIDE TO SUCCESSFUL DESIGN OF SMALL COMMERCIAL AND INSTITUTIONAL HVAC SYSTEMS (Fred W. Dougherty)


HƯỚNG DẪN THIẾT KẾ HVAC - HƯỚNG DẪN THIẾT KẾ CƠ KHÍ ĐỂ THIẾT KẾ THÀNH CÔNG CÁC HỆ THỐNG HVAC THƯƠNG MẠI VÀ NGAY LẬP TỨC (Fred W. Dougherty).

This book is the distillation of 30 yearís experience with HVAC design and construction, as a designer, as a supervisor, as an agency planner and reviewer, and finally, again, as a free lance HVAC designer of small commercial and institutional projects. My HVAC experience followed twenty years in the aerospace industry developing and testing military gas turbines and rocket engines.

The procedures and principles described here will be of value to technicians and graduate engineers with a firm background in thermodynamics and fluid flow ñ the bedrock fundamentals of HVAC processes. It is for engineers and technicians who are just entering the HVAC design field as members of a consulting engineering firm, or who wish to work independently for local architects and owners designing HVAC systems for small offices, mercantile establishments, churches, and restaurants. The principles and procedures outlined apply to any size job, but specific ìhow toî instructions are for small projects of limited scope. In most jurisdictions, a licensed professional engineer must sign and seal plans for submittal to a local building plans reviewer. However, in many engineering firms, much of the actual design work is performed by talented technicians or intern engineers under the supervision of a professional engineer.

CONTENTS:

Chapter 1 ñ Procedure Outline    3
Scope
Important Terms
Tasks of the HVAC Design
Chapter 2 ñ Project Information Needed for HVAC Design    7
Documents
Data Input
Review of Information
Codes, Standards, and References
Summary
Chapter 3 ñ Preliminary Design, Planning    13
Decisions to be Made
Outdoor Ambient Design Conditions
First Cost and Energy Efficiency
Elements of Design
Zoning the Project
DX Air Source Systems
Water Source Systems
Split System or Packaged
Heating Options
Summary
Chapter 4 ñ Balancing Outdoor Air and Exhaust Air    19
Scope
Basic Rules
Ventilation Based on Required Exhaust
Commercial Kitchens
Ventilation Based on Occupancy and Use
Variable Air Volume (VAV) Systems
Air Transfer Rules
Summary
Chapter 5 ñ Heat Loss and Heat Gain    27
Scope
Heat Gain and Heat Loss Elements
Envelope Elements ñ Walls, Roof, and Floor
Envelope Elements ñ Fenestration
Internal Loads
Unscheduled Outdoor Air Intake
Outdoor Ventilation Air
Heating and Cooling Load Notes and Tips
Chapter 6 ñ Cooling and Heating Load Calculations    33
Scope
Basic Principles
Calculation Procedures
The CLTD/CLF Method
Radiant Time Series
Walls and Roofs
Fenestration
Internal Loads
Summary
Chapter 7 ñ Psychrometric Considerations    45
Psychrometric Requirements
Psychrometric Chart
Process Lines
Dew Point
Sensible Heat Ratio
Load Variations
Plotting Points on the Psychrometric Chart
High Occupant Density
High Percentage of Outdoor Air
Heat Pipes
Rules
Chapter 8 ñ Energy Efficient Design    59
Introduction
Equipment Performance
Meeting the Minimum Standard
Life Cycle Cost
Implementing or Exceeding the Standard
Minimum Efficiency
Air Source vs Water Source
Fan Power Limitation
System Controls
CO2 Control of Outdoor Air Ventilation
Economizer
Handling Large Latent Loads
Consultation with Other Disciplines
Chapter 9 ñ Equipment Selection    65
Selection First Steps
The Iteration
Step 1 ñ Choose a Manufacturer, Model, and Size
Step 2 ñ Air Flow Iteration
Step 3 ñ Coil Inlet Conditions
Step 4 ñ Coil Capacity
Chapter 9 ñ Equipment Selection  - continued
Step 5 ñ Psychrometric Analysis
Reheat
Heat Pipe
Heat Pipe Selection
Outdoor Air Pre-Treatment
Pre-Treatment Outdoor Air Design Condition
Enthalpy Wheel ñ Energy Recovery Ventilator
DX 100% Outdoor Air Unit
Chapter 10 ñ Air Distribution    77
Principles of Air Distribution
Air Distribution Example
Building Sensible Load Elements
Distributing Air Flow to Each Space
Caveats
Implementing the Desired Air Flows
Chapter 11 ñ HVAC Controls and Indoor Air Quality    87
Basics of Indoor Air Quality Control
The Basic HVAC Control
Automatic Time of Day Control
Humidity Control
Reheat
Dedicated DX Outdoor Air Unit
Chapter 12 ñ Design Drawings, Specifications, Notes, and Schedules    95
Document Plan
Objective
Medium
Base Sheet
Elements of the Final Documents
Creating the Documents
Base Sheet
Equipment Schedules
Equipment Layout
Diffusers and Grilles
Ductwork Layout and Sizing
Exhaust and Outdoor Air Intake
Elevations and Details
Quality Control and Operational Notes
Chapter 13 ñ Checking Your Work       109
The Designerís Dilemma
Common Pitfalls
Symbols      113
continued. . .

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