Consulting-Specifying Engineer - March 2008 - (Page Supp14) BY KEITH LANE, PE, LEED AP, Partner/ Principal, Lane Coburn & Assocs., Seattle Heating Electrical heating calculations might be necessary when large amounts of electrical duct bank are routed belowgrade. When electrical duct banks with significant amounts of conduits and conductors are routed belowgrade, heating calculations are performed to determine if any conductor derating is required. Factors include the following: Number and size of conduits and conductors Configuration of the conduits and conductors Horizontal and vertical space between conductors Amount of earth above conductors RHO factor and the amount of the backfill material Load factor of the conductors Actual design load. When electrical conductors overheat past their rated use, burning or degrading of normal insulation that protects conductors can precipitate a short circuit condition. Electrical conductor heating calculations can be complicated, but there are software programs for determining the potential derating of feeder conductors in large electrical duct banks. Any conceivable underground duct bank configuration can be input into the software. Additionally, various wire sizes can be used within the duct bank configurations. Load factor is the ratio of the average load in kilowatts supplied during a designated period to the peak or maximum load in kilowatts taking place in that period. Load factor, in percent, also can be derived by multiplying the kilowatt hours (kWh) in the period by 100 and dividing by the product of the maximum demand in kilowatts and the number of hours in the period. For example, load factor = kWh in period/kW. Assume a one-day billing period for a total of 24 hours. A customer uses 15,000 kWh with a maximum demand of 1,500 kW. The customer’s load factor would be 41.6%: ((15,000 kWh/24 hrs/1,500 kW)*100). The 41.6% load factor represents a standard commercial building. The load factor in a data center would be significantly higher. 14 | PURE POWER // SPRING 2008
Table of Contents Feed for the Digital Edition of Consulting-Specifying Engineer - March 2008 Consulting-Specifying Engineer - March 2008 Contents Viewpoint Letters News M/E Roundtable Grade A HVAC When UPS and Gensets Have Issues Ignite Opportunities To Mentor Fire Protection Engineers Cooling People, Not Buildings Codes & Standards Case Study New Products Equipment Lifecycles Advertiser Index Green Space Pure Power Supplement Edison Institute Honors Recovery Efforts Canada Launches Clean Energy Software Climate Change Drives Increased Investment Critical Power for R&D Heating Calculations for Electrical Duct Bank Submetering for Energy Profiling New Products Consulting-Specifying Engineer - March 2008 Consulting-Specifying Engineer - March 2008 - (Page Intro) Consulting-Specifying Engineer - March 2008 - Consulting-Specifying Engineer - March 2008 (Page Cover1) Consulting-Specifying Engineer - March 2008 - Consulting-Specifying Engineer - March 2008 (Page Cover2) Consulting-Specifying Engineer - March 2008 - Consulting-Specifying Engineer - March 2008 (Page 1) Consulting-Specifying Engineer - March 2008 - Consulting-Specifying Engineer - March 2008 (Page 2) Consulting-Specifying Engineer - March 2008 - Contents (Page 3) Consulting-Specifying Engineer - March 2008 - Contents (Page 4) Consulting-Specifying Engineer - March 2008 - Contents (Page 5) Consulting-Specifying Engineer - March 2008 - Contents (Page 6) Consulting-Specifying Engineer - March 2008 - Viewpoint (Page 7) Consulting-Specifying Engineer - March 2008 - Letters (Page 8) Consulting-Specifying Engineer - March 2008 - Letters (Page 9) Consulting-Specifying Engineer - March 2008 - News (Page 10) Consulting-Specifying Engineer - March 2008 - News (Page 11) Consulting-Specifying Engineer - March 2008 - News (Page 12) Consulting-Specifying Engineer - March 2008 - News (Page 13) Consulting-Specifying Engineer - March 2008 - News (Page 14) Consulting-Specifying Engineer - March 2008 - News (Page 15) Consulting-Specifying Engineer - March 2008 - M/E Roundtable (Page 16) Consulting-Specifying Engineer - March 2008 - M/E Roundtable (Page 17) Consulting-Specifying Engineer - March 2008 - M/E Roundtable (Page 18) Consulting-Specifying Engineer - March 2008 - M/E Roundtable (Page 19) Consulting-Specifying Engineer - March 2008 - M/E Roundtable (Page 20) Consulting-Specifying Engineer - March 2008 - M/E Roundtable (Page 21) Consulting-Specifying Engineer - March 2008 - M/E Roundtable (Page 22) Consulting-Specifying Engineer - March 2008 - M/E Roundtable (Page 23) Consulting-Specifying Engineer - March 2008 - Grade A HVAC (Page 24) Consulting-Specifying Engineer - March 2008 - Grade A HVAC (Page 25) Consulting-Specifying Engineer - March 2008 - Grade A HVAC (Page 26) Consulting-Specifying Engineer - March 2008 - Grade A HVAC (Page 27) Consulting-Specifying Engineer - March 2008 - Grade A HVAC (Page 28) Consulting-Specifying Engineer - March 2008 - Grade A HVAC (Page 29) Consulting-Specifying Engineer - March 2008 - Grade A HVAC (Page 30) Consulting-Specifying Engineer - March 2008 - Grade A HVAC (Page 31) Consulting-Specifying Engineer - March 2008 - Grade A HVAC (Page 32) Consulting-Specifying Engineer - March 2008 - Grade A HVAC (Page 33) Consulting-Specifying Engineer - March 2008 - When UPS and Gensets Have Issues (Page 34) Consulting-Specifying Engineer - March 2008 - When UPS and Gensets Have Issues (Page 35) Consulting-Specifying Engineer - March 2008 - When UPS and Gensets Have Issues (Page 36) Consulting-Specifying Engineer - March 2008 - When UPS and Gensets Have Issues (Page 37) Consulting-Specifying Engineer - March 2008 - When UPS and Gensets Have Issues (Page 38) Consulting-Specifying Engineer - March 2008 - When UPS and Gensets Have Issues (Page 39) Consulting-Specifying Engineer - March 2008 - Ignite Opportunities To Mentor Fire Protection Engineers (Page 40) Consulting-Specifying Engineer - March 2008 - Ignite Opportunities To Mentor Fire Protection Engineers (Page 41) Consulting-Specifying Engineer - March 2008 - Ignite Opportunities To Mentor Fire Protection Engineers (Page 42) Consulting-Specifying Engineer - March 2008 - Ignite Opportunities To Mentor Fire Protection Engineers (Page 43) Consulting-Specifying Engineer - March 2008 - Ignite Opportunities To Mentor Fire Protection Engineers (Page 44) Consulting-Specifying Engineer - March 2008 - Ignite Opportunities To Mentor Fire Protection Engineers (Page 45) Consulting-Specifying Engineer - March 2008 - Ignite Opportunities To Mentor Fire Protection Engineers (Page 46) Consulting-Specifying Engineer - March 2008 - Cooling People, Not Buildings (Page 47) Consulting-Specifying Engineer - March 2008 - Cooling People, Not Buildings (Page 48) Consulting-Specifying Engineer - March 2008 - Cooling People, Not Buildings (Page 49) Consulting-Specifying Engineer - March 2008 - Cooling People, Not Buildings (Page 50) Consulting-Specifying Engineer - March 2008 - Cooling People, Not Buildings (Page 51) Consulting-Specifying Engineer - March 2008 - Codes & Standards (Page 52) Consulting-Specifying Engineer - March 2008 - Codes & Standards (Page 53) Consulting-Specifying Engineer - March 2008 - Codes & Standards (Page 54) Consulting-Specifying Engineer - March 2008 - Codes & Standards (Page 55) Consulting-Specifying Engineer - March 2008 - Case Study (Page 56) Consulting-Specifying Engineer - March 2008 - Case Study (Page 57) Consulting-Specifying Engineer - March 2008 - New Products (Page 58) Consulting-Specifying Engineer - March 2008 - New Products (Page 59) Consulting-Specifying Engineer - March 2008 - New Products (Page 60) Consulting-Specifying Engineer - March 2008 - New Products (Page 61) Consulting-Specifying Engineer - March 2008 - Equipment Lifecycles (Page 62) Consulting-Specifying Engineer - March 2008 - Equipment Lifecycles (Page 63) Consulting-Specifying Engineer - March 2008 - Equipment Lifecycles (Page 64) Consulting-Specifying Engineer - March 2008 - Equipment Lifecycles (Page 65) Consulting-Specifying Engineer - March 2008 - Equipment Lifecycles (Page 66) Consulting-Specifying Engineer - March 2008 - Equipment Lifecycles (Page 67) Consulting-Specifying Engineer - March 2008 - Equipment Lifecycles (Page 68) Consulting-Specifying Engineer - March 2008 - Advertiser Index (Page 69) Consulting-Specifying Engineer - March 2008 - Green Space (Page 70) Consulting-Specifying Engineer - March 2008 - Green Space (Page Cover3) Consulting-Specifying Engineer - March 2008 - Green Space (Page Cover4) Consulting-Specifying Engineer - March 2008 - Pure Power Supplement (Page SuppCover1) Consulting-Specifying Engineer - March 2008 - Pure Power Supplement (Page SuppCover2) Consulting-Specifying Engineer - March 2008 - Pure Power Supplement (Page Supp1) Consulting-Specifying Engineer - March 2008 - Pure Power Supplement (Page Supp2) Consulting-Specifying Engineer - March 2008 - Edison Institute Honors Recovery Efforts (Page Supp3) Consulting-Specifying Engineer - March 2008 - Canada Launches Clean Energy Software (Page Supp4) Consulting-Specifying Engineer - March 2008 - Canada Launches Clean Energy Software (Page Supp5) Consulting-Specifying Engineer - March 2008 - Climate Change Drives Increased Investment (Page Supp6) Consulting-Specifying Engineer - March 2008 - Climate Change Drives Increased Investment (Page Supp6A) Consulting-Specifying Engineer - March 2008 - Climate Change Drives Increased Investment (Page Supp8B) Consulting-Specifying Engineer - March 2008 - Climate Change Drives Increased Investment (Page Supp7) Consulting-Specifying Engineer - March 2008 - Critical Power for R&D (Page Supp8) Consulting-Specifying Engineer - March 2008 - Critical Power for R&D (Page Supp9) Consulting-Specifying Engineer - March 2008 - Critical Power for R&D (Page Supp10) Consulting-Specifying Engineer - March 2008 - Critical Power for R&D (Page Supp11) Consulting-Specifying Engineer - March 2008 - Critical Power for R&D (Page Supp12) Consulting-Specifying Engineer - March 2008 - Critical Power for R&D (Page Supp13) Consulting-Specifying Engineer - March 2008 - Heating Calculations for Electrical Duct Bank (Page Supp14) Consulting-Specifying Engineer - March 2008 - Heating Calculations for Electrical Duct Bank (Page Supp15) Consulting-Specifying Engineer - March 2008 - Heating Calculations for Electrical Duct Bank (Page Supp16) Consulting-Specifying Engineer - March 2008 - Heating Calculations for Electrical Duct Bank (Page Supp17) Consulting-Specifying Engineer - March 2008 - Heating Calculations for Electrical Duct Bank (Page Supp18) Consulting-Specifying Engineer - March 2008 - Heating Calculations for Electrical Duct Bank (Page Supp19) Consulting-Specifying Engineer - March 2008 - Submetering for Energy Profiling (Page Supp20) Consulting-Specifying Engineer - March 2008 - Submetering for Energy Profiling (Page Supp21) Consulting-Specifying Engineer - March 2008 - Submetering for Energy Profiling (Page Supp22) Consulting-Specifying Engineer - March 2008 - Submetering for Energy Profiling (Page Supp23) Consulting-Specifying Engineer - March 2008 - Submetering for Energy Profiling (Page Supp24) Consulting-Specifying Engineer - March 2008 - Submetering for Energy Profiling (Page Supp25) Consulting-Specifying Engineer - March 2008 - Submetering for Energy Profiling (Page Supp26) Consulting-Specifying Engineer - March 2008 - Submetering for Energy Profiling (Page Supp27) Consulting-Specifying Engineer - March 2008 - New Products (Page Supp28) Consulting-Specifying Engineer - March 2008 - New Products (Page SuppCover3) Consulting-Specifying Engineer - March 2008 - New Products (Page SuppCover4)
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