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HVAC David David M. M. Elovitz, Elovitz, PE PE : :
: : ASHRAE ASHRAE Journal Journal jun jun.2003 2003 :
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Stephen J. Davis :
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John Clark, P.E. :
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. . . . . . . . 1- air handling unit 2- make up air unit 3- economizer 4 air relief/air exhaust 5 Bypass and Face
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Edward Edward Butts Butts PE PE : :
: : Pumps : Pumps & & systems systems :
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Thermal and Moisture Control ) (
5. The term used for the difference between desorption and adsorption isotherms. 10. The flow of heat energy induced by a temperature difference can be called heat transfer, rate of heat flow, or _________________ transmission. 12. If this is properly done, then rainwater will discharge away from a building foundation. 13. This suction(s) is defined by the equation: s = (2sCosu)/r. Where: s = the surface tension of water; r = the radius of the capillary; and u = the contact wetting angle. 14. This is one of the properties of insulation that needs to be considered to control sound. 16. These air-transporting conduits in a building can be insulated sheet metal, fibrous glass, or flexible style, all of which provide combined air barrier, thermal insulation, and sound adsorption.
Answer
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ACROSS 1. This is the heat transfer to or from the surface by the combination effects of radiation, convection, and conduction. 3. This is the thickness of insulation that is the optimum (most cost effective) with respect to cost vs. energy savings for a specific insulation. 6. This thermal value is the reciprocal of thermal conductivity. 7. A term used that includes the exterior walls, glass, doors, roof, and foundation of a building. 8. This organization publishes Technical Bulletin 209RR-86 "Ventilation and Moisture Control for Residential Roofing." 9. If a fan or turbine is installed in an attic, this variable will generally be less than in an attic that is naturally ventilated. 11. A water-attracting material. 15. The term used to describe when a water-attracting material gains moisture due to the rising of the relative humidity surrounding the material. 17. This organization publishes Technical Data Bulletin 10(3) "Recommended Practices for Controlling Moisture in Crawl Spaces."
18. The longer that the relative humidity remains above the critical value, the more likely this will be visible. 19. Generally the large ones of these can be insulated with flexible material or with curved, flat segmented, or cylindrical sections, whereas smaller ones are insulated with cylindrical half-sections or with factory-applied jackets. 20. These are recommended and sometimes mandated in heating climates to prevent vapor migration through the building envelope. 21. This organization publishes Standard F 372-94 "Standard Test Method for Water Vapor Transmission Rate of Flexible Barrier Materials Using an Infrared Detection Technique."
DOWN 1. This is occasionally common on windows in buildings in climates with 4,000 heating degree-days or more during winter and fall. 2. If this type of roof system is used, condensation must be prevented when insulation is placed between the heated interior and this roof element. 4. These thermal products are materials or combinations of materials that retard the rate of heat by conductive, convective, and/or radiative transfer modes.
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: U.S. Department of Energy :
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KENNETH E. ROBINSON, CIH :
: HPAC :
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) . oF oF ) . ) . ) . oF ) . ) . . . REFERENCES 1) Dalla Valle, J. M., & Hatch, T. (1932). Studies in the of local exhaust hoods. ASME Transactions, Vol. 54. de-sign 2) Robinson, K. E., (1961, November). Industrial Can Be More E ffective and Cost Less. Heating/ Piping/ Ventila-tion AirConditioning.
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Matthew Jacobs :
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Bruce Bruce Manclark Manclark :
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. . . . . . Home Energy . . . . . HVAC ! . CFM CFM ASHRAE62 . . . CFM ()downdraft stove( . CFM ) CFM CFM CFM . CFM . . CFM )Blower Door( . )HVI(
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