Air Conditioning and Refrigeration CHRONOLOGY

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Metering valves d. pressure reducing valves e. all of the above f. none of the above Small boiler systems—those having capacities of 10,000 pounds per hour of steam or less—are often equipped with underfeed stokers in which the fuel is forced into the combustion area by a ram or ___________. a. screw b. stoker c. rake d. hopper 34 HVAC Licensing Exam Study Guide 8. Spreader stoker systems are often used in boilers designed to generate steam in quantities of ___________ pounds per hour and higher.

42. 43. 44. 45. 46. 47. 48. 49. 50. TRUE-FALSE ANSWERS 1. 2. 3. 4. T T F T 5. 6. 7. 8. F T T T 9. 10. 11. 12. T T T T 13. F 14. T 15. T C B C A C C B A B A —NOTES— Chapter 2 HEATING SYSTEMS HVAC Licensing Study Guide Copyright © 2007 by The McGraw-Hill Companies, Inc. Click here for terms of use. 20 HVAC Licensing Exam Study Guide HOT-WATER HEATING Hot-water heating systems transmit only sensible heat to radiators, as distinguished from steam systems that work principally by the latent heat of evaporation.

The following are some advantages of radiant-panel heating: 1. Radiant-panel heating eliminates radiators and grills, thus providing more floor space and resulting in better furniture arrangements and wall decorations. 2. There is less streaking of walls and ceiling due to lower velocities of air currents. 3. It provides warm floors in homes with no basement. 4. It simplifies interior architectural and engineering building designs. 5. A well-designed and installed radiant-panel heating system provides low operating and maintenance costs.

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