Heat Rejection Options in HVAC Systems

In Heat Rejection Options in HVAC Systems, you'll learn ...

• The concept of total heat of rejection (THR), its derivation and how it applies to the process of air conditioning
• Five prominent methods of heat rejection
• Importance of sub-cooling and super-heat in air-cooled condensers
• Types, rating and selection of air cooled condensers

Overview

Preview a portion of this course before purchasing it.

Credit: 4 CPD

Length: 42 pages

One of the basic requirements of the air conditioning and refrigeration system is to reject heat to the outdoors. Air conditioning chillers come in two different forms:

• An air-cooled chiller uses the flow of outside air across the condenser to remove or reject heat from the chiller. Air-cooled chillers typically have the condenser mounted on the roof or somewhere outside the facility while the evaporator can either be inside or outside the facility.
• Water-cooled chillers are typically 100 tons or greater and use water to remove the heat from the condenser. Water-cooled chillers are typically more efficient than air-cooled chillers. The condenser water is kept cool by a cooling tower, or water from the city main or well water is used. A water-cooled chiller will typically have the condenser and evaporator inside a facility while the cooling tower is located outside.

The range of chillers and associated heat rejection equipment is wide ranging. This 4-hour course provides a comprehensive description of the five prominent heat rejection methods as applicable to air conditioning systems.

This course is applicable to architects, air-conditioning engineers, controls engineers, contractors, environmentalists, energy auditors and loss prevention professionals. It is assumed that all the readers know the basic functioning of the air-conditioning system.

Learning Objectives

Upon completion of this course, participants will be able to:

• Explain the concept and derivation of total heat of rejection (THR) and its application to air-conditioning.
• Identify five prominent methods of heat rejection.
• Describe the importance of subcooling and superheat in air-cooled condensers.
• Explain the types, ratings, and selection of air-cooled condensers.
• Describe the operating principle of wet cooling towers.
• Differentiate among crossflow, counterflow, induced-draft, and forced-draft cooling towers.
• Explain capacity control in air-cooled and water-cooled systems.
• Compare closed-circuit fluid coolers with evaporative condensers.
• Evaluate the energy performance of air-cooled chillers versus water-cooled systems.
• Explain the effectiveness of adiabatic cooling technology.
• Compare the benefits and limitations of various heat-rejection methods.
• Select an appropriate heat-rejection method based on capital costs and environmental criteria.

Certificate of Completion

You will be able to immediately print a certificate of completion after passing a multiple-choice quiz consisting of 20 questions. CPD credits are not awarded until the course is completed and quiz is passed.