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Introduction to HVAC

The goal for a HVAC (Heating, Ventilation and Air Conditioning) system is to provide proper air flow, heating, and cooling to each room. In this process HVAC systems can provide reduce air infiltration and maintain pressure relationships between spaces.

HVAC guides
HVAC guides (heating, ventilation and air conditioning)

In HVAC Industries there are so many standard organizations such as ASHRAE, SMACNA, ACCA, Uniform Mechanical Code, International Mechanical Code, and AMCA have been established to support the industry and encourage high standards and achievement.

Sometimes HVAC Design (heating, ventilation, air conditioning) systems have been compared to a mystical science, part alchemy, part religious ritual.

Following the basic steps of HVAC System Design:

  • Design HVAC systems for people living inside buildings, not for the buildings alone.
  • You can’t fit a 24″ deep duct into a 23″ space, or, it’s the coordinated space
  • Be as fair as you can with and to all manufacturers
  • Dig deep into a given piece of equipment’s technical specs, and find nuggets of information that might save the owner and/or contractor money
  • Use nature to help your design
  • Have pity on the poor SOB’s that have to come behind you and service the system you design
  • In the end, only complaints or the lack of them matter

HVAC Process

In HVAC System, Ventilating is the process of replacing air in any space to control temperature or remove smoke, heat, dust and airborne bacteria. Ventilation includes both the exchange of air to the outside as well as circulation of air within the building.

It is one of the most important factors for maintaining acceptable indoor air quality in buildings.

There are different types of standard heating process in HVAC system design. Central heating is often used in cold climates to heat residential houses and commercial buildings. Heating can also be provided from electric, or resistance heating using a filament that becomes hot when electricity is caused to pass through it.

Air conditioning and refrigeration are provided through the removal of heat.

An air conditioning system, or a standalone air conditioner, provides cooling, ventilation, and humidity control for all or part of a house or building.

All documents, EE software and EE books are free to download.


Guide to Combined Heat and Power Systems

The guide is organized into topics that address many of the fundamental issues encountered in planning a CHP project and focuses on technical subjects associated with the integration of cogeneration… Read more

Released on Nov 22, 2011

Ground-Source Heat Pump Project Analysis

Maintaining a comfortable temperature inside a building can require a significant amount of energy. Separate heating and cooling systems are often used to maintain the desired air temperature, and the… Read more

Released on Dec 04, 2010

Heating and Cooling With a Heat Pump

If you are exploring the heating and cooling options for a new house or looking for ways to reduce your energy bills, you may be considering a heat pump. A… Read more

Released on Dec 04, 2010

User Guide for Desiccant Dehumidification Technology

Manufacturing industries have used desiccants in various applications for over 50 years, but have only recently begun to apply desiccant dehumidification systems (DDSs) to Heating, Ventilation, and Air-Conditioning (HVAC) applications…. Read more

Released on Oct 19, 2010

Thermodynamics Heat Transfer and Fluid Flow Handbook

The Thermodynamics, Heat Transfer, and Fluid Flow Fundamentals Handbook was developed to assist nuclear facility operating contractors provide operators, maintenance personnel, and the technical staff with the necessary fundamentals training… Read more

Released on Oct 19, 2010

Recommendations for loop sizing and piping guidelines

These residential closed-loop ground source heat pump (a.k.a geothermal or groundcoupled heat pumps) design guidelines were developed in conjunction with a project sponsored by the Tennessee Valley Authority in conjunction… Read more

Released on Oct 19, 2010

Primer on spontaneous heating and pyrophoricity

The purpose of this Primer is to provide operations and maintenance personnel with the information necessary to identify and prevent potential spontaneous combustion hazards. Throughout the history of industry and… Read more

Released on Oct 19, 2010

GeoSource Heat Pump Handbook

What is a heat pump? A heat pump is a mechanical device used for heating and cooling which operates on the principle that heat can be pumped from a cooler… Read more

Released on Oct 19, 2010

Fundamentals of air pollution engineering

Analysis and abatement of air pollution involve a variety of technical disciplines. Formation of the most prevalent pollutants occurs during the combustion process, a tightly coupled system involving fluid flow,… Read more

Released on Oct 19, 2010

Handbook of PE pipe

Published by the Plastics Pipe Institute (PPI), the Handbook describes how polyethylene piping systems continue to provide utilities with a cost effective solution to rehabilitate the underground infrastructure. The book… Read more

Released on Oct 19, 2010

Excel Programs Containing Macros

Most of the programs available with HVAC Simplified (ASHRAE, 2006) and from the geokiss.com website contain MS Visual Basic macros to perform the more complex calculations. Since macros from unfamiliar… Read more

Released on Oct 13, 2010

Control Valve Handbook

Process plants consist of hundreds, or even thousands, of control loops all networked together to produce a product to be offered for sale. Each of these control loops is designed… Read more

Released on Sep 20, 2010

Refrigeration and air conditioning

You have studied the fundamentals and commercial refrigeration and air-conditioning systems. This final volume deals with another phase of your career ladder-equipment cooling. Since the principles of equipment cooling are… Read more

Released on Sep 20, 2010

7 Comments


  1. Nhat Tran
    Jun 08, 2015

    Useful book


  2. RAVEENDRAREDDY
    Apr 27, 2015

    power saving purpose used vfd and to be connected velocity sensor


  3. RAVEENDRAREDDY
    Apr 27, 2015

    how to design cooling coil capacity and heaters capacity. if any formula is there


  4. RAVEENDRAREDDY
    Apr 27, 2015

    how to design in clea rooms.example:1000tr chiller installed .how much size in header line and and discharge line. please guide me


  5. jezehelfranca
    Aug 06, 2012

    How to apply VSD or decided to use VSD for motors in HVAC system?


  6. Dharmendra Sharma
    Dec 15, 2010

    for eduction purpose


    • prodaja
      Dec 24, 2011

      Great collection of books!

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