Engineered Systems - February 2008 - (Page 12) Take the HVAC CHALLENGE ™ BY STEVEN G. LIESCHEIDT, P.E., CSI-CCS, CCPR ST STEVEN TE LIESCHEIDT, P.E., CSI-CCS, CCPR HEIDT, EIDT, CSI-CCS, C R 13 This 13. This type of boiler i generally available in 3 3. h is standard sizes up to and above 100,000 lb/hr. si to a sizes raft a 14. This type of draft bo draft boiler is designed to operate with a negative p negative pressure in the combusgat ga tion chambe and in the flue connection. ber n e er chamber and Boilers brush ush fact To brush up on the facts behin behin ehind this month’s month’s behind this month’s clues, refer lue u efe f C ap Chapter p clues, refer to Chapter 27 (“Boi ers ) n Boilers”) rs 0 27 (“Boilers”) in the 2004 2004 ASH RAE H AE E Ha ndb ook bo ASHRAE Handbook q – Systems and EquipEquipment. Liescheidt is a sales engineer with Langendorf Supply Co., Inc. in St. Louis, MO. E-mail him at stevel@lsco-inc.com. Can't wait until next issue? Now, check out the answers for this month's "HVAC Challenge" on page 70 or check out answers from past puzzles on www.esmagazine.com. ACROSS 3. In this type of boiler, air is drawn into the combustion chamber to maintain negative pressure. 5. This type of boiler is constructed for maximum working pressures of 15 psig steam and up to 160 psig hot water. 7. This type of draft boiler uses a fan or blower or other machinery to create the required pressure difference across the boiler. 10. This efficiency is gross energy output divided by energy input. 11. This efficiency is the input minus stack loss divided by input, and generally ranges from 75% to 86% for most non-condensing boilers. 13. This efficiency is the actual operating efficiency that the boiler will achieve during the heating season at various loads. 15. This type of boiler is generally available in standard sizes from 35,000 to over 100,000 Btuh. 16. The ratio of maximum to minimum fuel input. 17. In this type of boiler design, the combustion chamber is surrounded by the fluid backed sections. DOWN 1. In this type of boiler design, the tops and sides of the combustion chamber are enclosed by fluid-backed sections. 2. This type of boiler is designed to operate above 15 psig steam, or above 160 psig and/or 250°F for water boilers. 4. In this type of boiler, air is forced into the combustion chamber to maintain a positive pressure in the combustion camber and/or space between the tubing and the jacket. 6. This type of boiler generally ranges in size from 50,000 Btuh to the largest boilers made, and the designs are constructed to either ASME SCI or SCIV requirements. 8. This type of cast-iron boiler is generally designed according to ASME SCIV requirements and ranges in size from 35,000 to 13,975,000 Btuh gross output. 9. This organization published Standard CSD-1-1998 “Controls and Safety Devices for Automatically Fired Boilers.” 12. In this type of boiler design, the combustion chamber is beneath the fluid-backed sections. Solution to January’s HVAC Challenge™ 12 En gi neer ed S y stem s February 2008 http://www.esmagazine.com
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