Radiant Heating and Cooling Handbook

Section 7: RADIANT HEATING AND COOLING HYBRID SYSTEMS

Chapter 1: WHEN TO USE HYBRID SYSTEMS
Chapter 2: CONVECTIVE SYSTEMS WITH RADIANT PANELS
Chapter 3: VENTILATION WITH RADIANT HEATING AND COOLING
Chapter 4: HYBRID HEATING AND COOLING DEMONSTRATION PROJECTS

1.1 HEATING SYSTEM DEFINITIONS

Heating systems are used to condition and protect buildings and their contents. However, the second and most commonly identified threshold for heating system use is to provide occupant thermal comfort. Gan and Croome (1994) reported that almost 40 percent of the world s nonrenewable energy is used to achieve thermal comfort in buildings. Thermal distribution systems can use one or both of two different modes of heat transfer, convection and radiation, to deliver thermal comfort to an occupant.

Figure 1.1illustrates the difference in heating modes. The forced-air system [Fig. 1.1(b)] uses primarily convection to deliver the heat energy to the occupant. The system heats the air first. Then the air heats the occupant. With a radiant system [Fig. 1.1(c)], the occupant is first heated. Then the occupant and the other room surfaces heat the surrounding air. To accurately mathematically model a heating system and predict the thermal comfort of an occupant, it is necessary to know the relative amounts of energy transferred by each mode, called the radiative-convective split.


FIGURE 1.1: Radiant-convective heaters. ( a) Natural convection. ( b) Forced-air convection. ( c) Radiant heating panels. ( Courtesy of Morris L. Markel.)

Section 7briefly describes three major types of heating systems: in-space convective heating systems, radiant heating systems, and combination or hybrid...

UNLIMITED FREE ACCESS TO THE WORLD'S BEST IDEAS

close
Already an Engineering360 user? Log in.

This is embarrasing...

An error occurred while processing the form. Please try again in a few minutes.

Customize Your Engineering360 Experience

close
Category: Chilled Beams
Privacy Policy

This is embarrasing...

An error occurred while processing the form. Please try again in a few minutes.