Engineered Systems - June 2008 - (Page 18)

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 refrige 3 3. h refrigerant expansion coil is e used for halocarbon refrigerants. a o halocarbon direc ect ect 14. This type of direc -e direct-expansion coil control is the most widely used because of its simplicely ity, and it equally load all refrigerant circuits qu y q equally loads in the coil. he coil. il. l. l brush ush fa To brush up on the fac behind this month’s facts clues, clues refer Chapter ues Chapter clues, refer to Chapter 21 (“Air Cooling and Dehumid ing Coils”) midifying Coils”) id ng g ) 0 midifying C ils”) in the 20 ASHRAE Handbook 2004 Systems and Equi me stems stems t qu e – Systems and Equipmen Equipment. Air Cooling and Dehumidifying Coils 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 81 or check out answers from past puzzles on ACROSS 2. Publishes Standard 700, “Specification for Fluorocarbon Refrigerants.” 4. Cooling coils for water, aqueous glycol, brine, or halocarbon refrigerants usually have tubes made of this material. 9. This concept is useful for analyzing a given heat exchanger. 10. For a coil, this is derived according to ASME’s Boiler and Pressure Vessel Code, Section VIII, Division I and Section II. 11. These are sometimes used to bond header connections, return bends, and fintubed joints. 15. Cooling coils for water, aqueous glycol, brine, or halocarbon refrigerants usually have fins of this material. 16. Thermostatic expansion valve. 17. In general, air cooling and dehumidifying coils are multi-row and circuited for this flow arrangement. 18. A fluid other than water that is used in air cooling and dehumidifying coils. DOWN 1. This type of direct-expansion coil control eliminates air bypassing during partialload operation and minimizes condensate re-evaporation. 3. This type of direct-expansion coil control circuit control uses the whole face area and depth of coil when some expansion valves are shut off. 5. This type of surface cooling coil design (finned) is the most popular and practical. 6. This type of expansion vale system is commonly used for all direct-expansion coil applications particularly fieldassembled coil sections and those used in central AHUs. 7. In this type of coil construction, the external surface of the tubes is primary and the fin surface is secondary. 8. This society publishes Standard AG-1 “Code on Nuclear Air and Gas Treatment.” 12. This tube is applied in factory-assembled, self-contained A/C systems up to approximately 10-ton capacity but is most widely used on smaller capacity models such as window or room units. www.esmagazine.com. Solution to May’s HVAC Challenge™ 18 En gi neer ed S y stem s June 2008 http://www.esmagazine.com

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Engineered Systems - June 2008 Contents Editor’s Note Letters To The Editor Back2Basics HVAC Challenge Case In Point Commissioning Efficiency Incentives HydroTech Building Automation Energy Wiz HVACR Designer Tips Notre Dame Tackles the Heat State Of The Arts Time For A Transplant? Project Delivery: What Can IPD Do For You? Issues & Events Computers & Software Products Application Checklist Glossary Classifieds Advertiser Index Tomorrow’s Engineer

Engineered Systems - June 2008

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