ASHRAE Journal - October 2009 - 54
ASHRAE59–2009 YE A R S JOURNAL The use of chilled water coils appears to be superior to direct-expansion coils for precise temperature control, at least in this situation. The hot water preheat and reheat coils are supplied from either the district hot water supply or an auxiliary gas-fired boiler. Control of these coils is also achieved with 3-way valves. Water flow is constant through each coil when it is in use—only the inlet temperature is varied. It was found that good stability in the hot water loop could also be achieved with rapidly fluctuating loads if a 1000 liter (264 gal) buffer tank and the usual expansion tank were placed in the line between the boiler and the heating coils. The supply air ducts required special attention. Because no particles of any kind could be introduced into the supply air stream, there could be no exposed insulation within the duct work, which would be gradually eroded by air flow. This required that the ducts have double-wall construction, with thermal insulation placed between the stainless steel inner and the aluminum outer walls. This provided thermal insulation and some acoustical attenuation. A third, outer painted steel sheet metal covering was added for further protection and also as camouflage. The wide-angle outlet diffuser units were constructed in a similar way, with the acoustical insulation by perforated metal and a protective plastic film. Due to severe space limitations, the chiller unit, chilled water pumps and valves, and the auxiliary gas boiler were placed in a second sub-basement storage room. This location was also preferred because it was not directly under the Chapel and would not transmit potentially harmful structural vibrations to the Chapel. The air handling unit was placed on an outdoor terrace, then covered with a brick and tile enclosure so as to blend in with the original building architecture. The cooling tower was placed in an inconspicuous location near the air handling unit. The air handling unit and the cooling tower were also located away from the main Chapel structure in order to avoid vibration transmittance. The exposed supply air duct work was also painted to blend in with the existing building, as noted previously. The new exhaust air unit was located in a separate room in the second sub-basement and connected with the same ducts previously used by the old under-floor heating unit. Finally, sensors were located at numerous locations within the Chapel interior, on the water chiller, on the air handling unit and other key points. A variety of sensors were used: temperature; humidity (dew point); pressure; On/off. www.info.hotims.com/25209-9 ASHRAE Journal October 2009
ASHRAE Journal - October 2009
Table of Contents for the Digital Edition of ASHRAE Journal - October 2009
ASHRAE Journal - October 2009
Table of Contents
Commentary
Industry News
Letters
Meetings and Shows
Commercial Building Retuning
Simplified GCHP System
50th Anniversary Feature: The Sistine Chapel
Designing Chilled Beams for Thermal Comfort
Building Sciences
ASHRAE Research Report
ASHRAE Honor Roll
Technical Topics
Emerging Technologies
Special Products
International Column
Products
People
Classified Advertising
Advertisers Index
ASHRAE Journal - October 2009 - ASHRAE Journal - October 2009
ASHRAE Journal - October 2009 - Cover2
ASHRAE Journal - October 2009 - 1
ASHRAE Journal - October 2009 - 2
ASHRAE Journal - October 2009 - Table of Contents
ASHRAE Journal - October 2009 - 4
ASHRAE Journal - October 2009 - Commentary
ASHRAE Journal - October 2009 - Industry News
ASHRAE Journal - October 2009 - 7
ASHRAE Journal - October 2009 - 8
ASHRAE Journal - October 2009 - Letters
ASHRAE Journal - October 2009 - Meetings and Shows
ASHRAE Journal - October 2009 - 11
ASHRAE Journal - October 2009 - Commercial Building Retuning
ASHRAE Journal - October 2009 - 13
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ASHRAE Journal - October 2009 - Simplified GCHP System
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ASHRAE Journal - October 2009 - 33a
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ASHRAE Journal - October 2009 - 40
ASHRAE Journal - October 2009 - 41
ASHRAE Journal - October 2009 - 50th Anniversary Feature: The Sistine Chapel
ASHRAE Journal - October 2009 - 43
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ASHRAE Journal - October 2009 - 45
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ASHRAE Journal - October 2009 - 56
ASHRAE Journal - October 2009 - 57
ASHRAE Journal - October 2009 - Designing Chilled Beams for Thermal Comfort
ASHRAE Journal - October 2009 - 59
ASHRAE Journal - October 2009 - 60
ASHRAE Journal - October 2009 - 61
ASHRAE Journal - October 2009 - 62
ASHRAE Journal - October 2009 - 63
ASHRAE Journal - October 2009 - 64
ASHRAE Journal - October 2009 - Building Sciences
ASHRAE Journal - October 2009 - 66
ASHRAE Journal - October 2009 - 67
ASHRAE Journal - October 2009 - 68
ASHRAE Journal - October 2009 - ASHRAE Research Report
ASHRAE Journal - October 2009 - 70
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ASHRAE Journal - October 2009 - ASHRAE Honor Roll
ASHRAE Journal - October 2009 - HR2
ASHRAE Journal - October 2009 - HR3
ASHRAE Journal - October 2009 - HR4
ASHRAE Journal - October 2009 - HR5
ASHRAE Journal - October 2009 - HR6
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ASHRAE Journal - October 2009 - HR14
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ASHRAE Journal - October 2009 - HR30
ASHRAE Journal - October 2009 - HR31
ASHRAE Journal - October 2009 - 80a
ASHRAE Journal - October 2009 - 80b
ASHRAE Journal - October 2009 - 80c
ASHRAE Journal - October 2009 - 80d
ASHRAE Journal - October 2009 - 80e
ASHRAE Journal - October 2009 - Technical Topics
ASHRAE Journal - October 2009 - Emerging Technologies
ASHRAE Journal - October 2009 - 83
ASHRAE Journal - October 2009 - 84
ASHRAE Journal - October 2009 - 85
ASHRAE Journal - October 2009 - Special Products
ASHRAE Journal - October 2009 - 87
ASHRAE Journal - October 2009 - International Column
ASHRAE Journal - October 2009 - 89
ASHRAE Journal - October 2009 - Products
ASHRAE Journal - October 2009 - People
ASHRAE Journal - October 2009 - 92
ASHRAE Journal - October 2009 - Classified Advertising
ASHRAE Journal - October 2009 - 94
ASHRAE Journal - October 2009 - 95
ASHRAE Journal - October 2009 - Advertisers Index
ASHRAE Journal - October 2009 - Cover3
ASHRAE Journal - October 2009 - Cover4
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