Heating is the first word in the acronym HVAC. It is the most important part because without heating mankind would have difficulty in surviving. Proper design of the heating system is even more critical than that of ventilation or cooling. Human history began to develop with the discovery and control of fire which increased people’s ability to survive in a harsh and control of fire | Source HVAC Systems Design Handbook Chapter 10 Equipment Part 2 Heating Introduction Heating is the first word in the acronym HVAC. It is the most important part because without heating mankind would have difficulty in surviving. Proper design of the heating system is even more critical than that of ventilation or cooling. Human history began to develop with the discovery and control of fire which increased people s ability to survive in a harsh environment. In modern heating system design two primary concerns are proper system sizing to achieve comfort and system reliability. Capital cost operating cost and pollution control are secondary in consideration. Pollution control is addressed by code authorities. Energy conservation and operating costs go together and have a considerable effect on life-cycle costs. These concerns and many others are addressed in this chapter. General In a modern heating system heating can be provided by 1. Fuel-fired or electric boilers that produce steam hot water or thermal 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 refrigeration equipment 321 Downloaded from Digital Engineering Library @ McGraw-Hill Copyright 2004 The McGraw-Hill Companies. All rights reserved. Any use is subject to the Terms of Use as given at the website. Equipment Part 2 322 Chapter Ten 4. Solar energy collectors both passive and active which heat either water or air and in some cases solid materials 5. Heat pumps either liquid or air 6. Direct-fired radiant heaters either electric or natural gas 7. Geothermal sources End users are provided heat by 1. Direct air furnaces duct heaters outside-air heaters reheat units ducted heat pumps 2. Indirect air coils and air-handling .
