will often provide healthy ize airborne transmission , fungus spores and other cing impact of building and nment .
INGENIEUR
Room Temp DB 18 ° C ± 1 ° C Relative Humidity 50 % ± 5 % Moisture Content 0.006-0.007 kg / kg
Dry Air Refer to Psychrometric Chart Figure 1 shared area . s paper is to explore new AC design for the OT dful on : al Comfort trol ervation
Maintenance
Figure 1 : Psychrometric Chart : For OT conditions at Figure 1 : Psychrometric Chart : For OT conditions , see shaded area . shaded area .
Chilled Water System
The chilled water system design is the most commonly used system for hospital applications as the system is able to provide constant space temperature . The system includes either air-cooled or water-cooled chillers , cooling towers , pumps ( for chilled water and condensed water ), air handling units ( AHU ), fan coil units ( FCU ), ducting , piping , wiring and associated auxiliary components .
However , a chilled water system which provides cooled water in the of range 5.6 ° C to 6.7 ° C , when supplied to an AHU has its limitation even with an oversize AHU coil . The best exit air temperature that can be achieved is on average 8 ° C to 10 ° C dew point . We still need to reduce the temperature of the air supply to 7.2 ° C dew point in order to remove a sufficient amount of moisture from the
Picture 4 : Typical Air Handling Unit system design
air . Therefore , we need another system to cater for this need . This is where a specially designed air handling unit comes in to cater for hospital needs .
Operating Theatre AHU Systems
Picture 3 : Water Cooled Chiller Plant Room System
There are many types of AHU systems available in the market for OT applications such as : a . Electric Reheat System ; b . Hot Water Reheat System ; c . Reheat plus Desiccant Wheel Heat
Recovery System ;
28 VOL 86 APRIL-JUNE 2021