TAILIEUCHUNG - Indoor and Outdoor Air Pollution Part 11

Tham khảo tài liệu 'indoor and outdoor air pollution part 11', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Correlation of Professional Performance to Acceptable IAQ in Critical Care Medical Facilities 91 Fig. 11. Improper site grading. A value engineering VE exercise resulted in the use of direct expansion DX roof top units with coils that had a sensible heat ratio too high to effectively dehumidify. Exhaust fans were VE and as a result the fans were located below the roof which was a violation of Title 25 Texas Administrative Code Chapter 133 Hospital Licensing State Regulations HLSR 2007 . It was obvious that the VE items selected were money driven and health and safety concerns and or the HLSR rules were ignored. Without an architects CA services in place to mind the store and with an unsophisticated owner the contractor and his subcontractors did whatever they wanted to do. Negative building pressure and improper pressure relationships were the major contributor to the poor physical environment. Pressure relationships between critical care areas inside the building with respect to other spaces were not in accordance with HLSR. Both design and installation defects contributed to these conditions. The design of the HVAC system was inadequate for humidity control. Engineers know that buildings located in hot and humid climates need HVAC systems designed to work in that climate yet only the dry-bulb coincident wet-bulb design condition was considered for coil selections. A test adjust balance and commissioning process was obviously never completely performed for the performance aspects of the project other than the air volume measurements. The HVAC control system was deficient in that it was never commissioned to control to the various pieces of equipment as an integrated system. In fact the maintenance staff at the facility was never trained to operate the system and they had to resort to an on-line third party provider for day-to-day control. In a response to uncontrolled high indoor humidity areas were over-cooled including OR which resulted in frequent condensation

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