ASHRAE Journal - August 2008 - (Page 40) Atlanta 0.45 Wall Assembly U-Value Btu/h · ft2 · °F Albuquerque, N.M. Boston Fort Worth, Texas Miami 0.45 Atlanta Albuquerque, N.M. Roof U-Value Btu/h · ft2 · °F Boston Fort Worth, Texas 0.3 0.3 Minneapolis Washington Miami Minneapolis Washington 0.15 0.15 0 1970 1980 1990 2000 0 1970 1980 1990 2000 Figure 2: 90.1 maximum wall assembly U-values over time. Figure 3: 90.1 maximum roof U-values over time. cooling loads. Latent cooling loads, which for most commercial buildings are primarily due to ventilation, infiltration, and occupants, have not changed substantially. The effect for most buildings constructed or thoroughly remodeled since 1990 is to raise the latent cooling load relative to the sensible cooling load at all conditions. At typical cooling design conditions (in most parts of the U.S., at high dry-bulb and high wet-bulb conditions), outdoor humidity levels and the consequent latent loading is quite high, while envelope and internal sensible loads have been reduced, compared to buildings constructed prior to 1990. Conventional unitary air conditioning tends to satisfy the sensible load well before the latent load is met, with the result that the steady-state indoor relative humidity increases from the desired range around 50% to around 70% (uncomfortable and supportive of mold growth). At moderate outdoor temperatures, 65°F to 70°F (18°C to 21°C), with FLOWHOOD ELECTRONIC FLOWHOOD DIRECT DIGITAL READOUT 25-2500 CFM AUTOMATICALLY CORRECTS FOR AIR DENSITY & BACKPRESSURE CHOICE OF METERS - AIR FLOW ONLY, OR AIR FLOW, VELOCITY, PRESSURE & TEMPERATURE OPTIONS INCLUDE: MEMORY, AVERAGE & SUM TO 2000 READINGS, SEQUENTIAL RECALL, AUTO-READ REPAIR POLICY - TWO WEEK TURNAROUND OR LESS CUSTOM TOPS MADE TO ORDER Shortridge Instruments, Inc. www.info.hotims.com/16017-67 www.info.hotims.com/16017-39 40 ASHRAE Journal August 2008 http://www.lumalier.com http://www.lumalier.com http://www.info.hotims.com/16017-67 http://www.info.hotims.com/16017-39
Table of Contents Feed for the Digital Edition of ASHRAE Journal - August 2008 ASHRAE Journal - August 2008 Contents Commentary Industry News Letters Meetings and Shows Maintain to Sustain—Delivering ASHRAE’s Sustainability Promise Ultraviolet Germicidal Irradiation: Current Best Practices Improving Humidity Control With Energy Recovery Ventilation Single- or Two-Stage Compression Data Center Cooling: Using Wet-Bulb Economizers Building Sciences InfoCenter Practical Pointers Products Emerging Technologies Washington Report People Special Products Classified Advertising Advertising Index ASHRAE Journal - August 2008 ASHRAE Journal - August 2008 - ASHRAE Journal - August 2008 (Page Cover1) ASHRAE Journal - August 2008 - ASHRAE Journal - August 2008 (Page Cover2) ASHRAE Journal - August 2008 - ASHRAE Journal - August 2008 (Page 1) ASHRAE Journal - August 2008 - ASHRAE Journal - August 2008 (Page 2) ASHRAE Journal - August 2008 - Contents (Page 3) ASHRAE Journal - August 2008 - Contents (Page 4) ASHRAE Journal - August 2008 - Commentary (Page 5) ASHRAE Journal - August 2008 - Industry News (Page 6) ASHRAE Journal - August 2008 - Industry News (Page 7) ASHRAE Journal - August 2008 - Industry News (Page 8) ASHRAE Journal - August 2008 - Industry News (Page 9) ASHRAE Journal - August 2008 - Industry News (Page 10) ASHRAE Journal - August 2008 - Industry News (Page 11) ASHRAE Journal - August 2008 - Industry News (Page 12) ASHRAE Journal - August 2008 - Industry News (Page 13) ASHRAE Journal - August 2008 - Industry News (Page 14) ASHRAE Journal - August 2008 - Industry News (Page 15) ASHRAE Journal - August 2008 - Industry News (Page 16) ASHRAE Journal - August 2008 - Industry News (Page BA1) ASHRAE Journal - August 2008 - Industry News (Page BA2) ASHRAE Journal - August 2008 - Letters (Page 17) ASHRAE Journal - August 2008 - Meetings and Shows (Page 18) ASHRAE Journal - August 2008 - Meetings and Shows (Page 19) ASHRAE Journal - August 2008 - Maintain to Sustain—Delivering ASHRAE’s Sustainability Promise (Page 20) ASHRAE Journal - August 2008 - Maintain to Sustain—Delivering ASHRAE’s Sustainability Promise (Page 21) ASHRAE Journal - August 2008 - Maintain to Sustain—Delivering ASHRAE’s Sustainability Promise (Page 22) ASHRAE Journal - August 2008 - Maintain to Sustain—Delivering ASHRAE’s Sustainability Promise (Page 23) ASHRAE Journal - August 2008 - Maintain to Sustain—Delivering ASHRAE’s Sustainability Promise (Page 24) ASHRAE Journal - August 2008 - Maintain to Sustain—Delivering ASHRAE’s Sustainability Promise (Page 25) ASHRAE Journal - August 2008 - Maintain to Sustain—Delivering ASHRAE’s Sustainability Promise (Page 26) ASHRAE Journal - August 2008 - Maintain to Sustain—Delivering ASHRAE’s Sustainability Promise (Page 27) ASHRAE Journal - August 2008 - Ultraviolet Germicidal Irradiation: Current Best Practices (Page 28) ASHRAE Journal - August 2008 - Ultraviolet Germicidal Irradiation: Current Best Practices (Page 29) ASHRAE Journal - August 2008 - Ultraviolet Germicidal Irradiation: Current Best Practices (Page 30) ASHRAE Journal - August 2008 - Ultraviolet Germicidal Irradiation: Current Best Practices (Page 31) ASHRAE Journal - August 2008 - Ultraviolet Germicidal Irradiation: Current Best Practices (Page 32) ASHRAE Journal - August 2008 - Ultraviolet Germicidal Irradiation: Current Best Practices (Page 33) ASHRAE Journal - August 2008 - Ultraviolet Germicidal Irradiation: Current Best Practices (Page 34) ASHRAE Journal - August 2008 - Ultraviolet Germicidal Irradiation: Current Best Practices (Page 35) ASHRAE Journal - August 2008 - Ultraviolet Germicidal Irradiation: Current Best Practices (Page 36) ASHRAE Journal - August 2008 - Ultraviolet Germicidal Irradiation: Current Best Practices (Page 37) ASHRAE Journal - August 2008 - Improving Humidity Control With Energy Recovery Ventilation (Page 38) ASHRAE Journal - August 2008 - Improving Humidity Control With Energy Recovery Ventilation (Page 39) ASHRAE Journal - August 2008 - Improving Humidity Control With Energy Recovery Ventilation (Page 40) ASHRAE Journal - August 2008 - Improving Humidity Control With Energy Recovery Ventilation (Page 41) ASHRAE Journal - August 2008 - Improving Humidity Control With Energy Recovery Ventilation (Page 42) ASHRAE Journal - August 2008 - Improving Humidity Control With Energy Recovery Ventilation (Page 43) ASHRAE Journal - August 2008 - Improving Humidity Control With Energy Recovery Ventilation (Page 44) ASHRAE Journal - August 2008 - Improving Humidity Control With Energy Recovery Ventilation (Page 45) ASHRAE Journal - August 2008 - Single- or Two-Stage Compression (Page 46) ASHRAE Journal - August 2008 - Single- or Two-Stage Compression (Page 47) ASHRAE Journal - August 2008 - Single- or Two-Stage Compression (Page 48) ASHRAE Journal - August 2008 - Single- or Two-Stage Compression (Page 49) ASHRAE Journal - August 2008 - Single- or Two-Stage Compression (Page 50) ASHRAE Journal - August 2008 - Single- or Two-Stage Compression (Page 51) ASHRAE Journal - August 2008 - Data Center Cooling: Using Wet-Bulb Economizers (Page 52) ASHRAE Journal - August 2008 - Data Center Cooling: Using Wet-Bulb Economizers (Page 53) ASHRAE Journal - August 2008 - Data Center Cooling: Using Wet-Bulb Economizers (Page 54) ASHRAE Journal - August 2008 - Data Center Cooling: Using Wet-Bulb Economizers (Page 55) ASHRAE Journal - August 2008 - Data Center Cooling: Using Wet-Bulb Economizers (Page 56) ASHRAE Journal - August 2008 - Data Center Cooling: Using Wet-Bulb Economizers (Page ACP1) ASHRAE Journal - August 2008 - Data Center Cooling: Using Wet-Bulb Economizers (Page ACP2) ASHRAE Journal - August 2008 - Data Center Cooling: Using Wet-Bulb Economizers (Page ACP3) ASHRAE Journal - August 2008 - Data Center Cooling: Using Wet-Bulb Economizers (Page ACP4) ASHRAE Journal - August 2008 - Data Center Cooling: Using Wet-Bulb Economizers (Page ACP5) ASHRAE Journal - August 2008 - Data Center Cooling: Using Wet-Bulb Economizers (Page ACP6) ASHRAE Journal - August 2008 - Data Center Cooling: Using Wet-Bulb Economizers (Page 57) ASHRAE Journal - August 2008 - Data Center Cooling: Using Wet-Bulb Economizers (Page 58) ASHRAE Journal - August 2008 - Data Center Cooling: Using Wet-Bulb Economizers (Page 59) ASHRAE Journal - August 2008 - Building Sciences (Page 60) ASHRAE Journal - August 2008 - Building Sciences (Page 61) ASHRAE Journal - August 2008 - Building Sciences (Page 62) ASHRAE Journal - August 2008 - Building Sciences (Page 63) ASHRAE Journal - August 2008 - Building Sciences (Page 64) ASHRAE Journal - August 2008 - Building Sciences (Page 65) ASHRAE Journal - August 2008 - InfoCenter (Page 66) ASHRAE Journal - August 2008 - InfoCenter (Page 67) ASHRAE Journal - August 2008 - InfoCenter (Page 68) ASHRAE Journal - August 2008 - InfoCenter (Page 69) ASHRAE Journal - August 2008 - InfoCenter (Page 70) ASHRAE Journal - August 2008 - InfoCenter (Page 71) ASHRAE Journal - August 2008 - Practical Pointers (Page 72) ASHRAE Journal - August 2008 - Practical Pointers (Page 73) ASHRAE Journal - August 2008 - Products (Page 74) ASHRAE Journal - August 2008 - Products (Page 75) ASHRAE Journal - August 2008 - Emerging Technologies (Page 76) ASHRAE Journal - August 2008 - Emerging Technologies (Page 77) ASHRAE Journal - August 2008 - Emerging Technologies (Page 78) ASHRAE Journal - August 2008 - Emerging Technologies (Page 79) ASHRAE Journal - August 2008 - Washington Report (Page 80) ASHRAE Journal - August 2008 - People (Page 81) ASHRAE Journal - August 2008 - Special Products (Page 82) ASHRAE Journal - August 2008 - Special Products (Page 83) ASHRAE Journal - August 2008 - Special Products (Page 84) ASHRAE Journal - August 2008 - Classified Advertising (Page 85) ASHRAE Journal - August 2008 - Classified Advertising (Page 86) ASHRAE Journal - August 2008 - Classified Advertising (Page 87) ASHRAE Journal - August 2008 - Advertising Index (Page 88) ASHRAE Journal - August 2008 - Advertising Index (Page Cover3) ASHRAE Journal - August 2008 - Advertising Index (Page Cover4)
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