Chapter hvac engineering Fundamentals: Part 1 Introduction

10.2
General
In a modern heating system, heating can be provided by
1. Fuel-fired or electric boilers that produce steam, hot water, or ther-
mal liquids for direct or indirect use
2. Furnaces, unit heaters, duct heaters, and outside-air heaters which
provide hot air for direct circulation to the conditioned space
3. Waste heat furnaces and boilers which utilize the waste energy
from some other source, such as a process, an incinerator, or re-
frigeration equipment
Source: HVAC Systems Design Handbook
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