At low outdoor temperatures, the energy drawn from the heating plant by the air conditioning system may be reduced by utilizing some of the available energy in the exhausted air to preheat the fresh air supplied. The mixing of fresh air and air exhausted from spaces that allow it to be recirculated is a frequently used method. However, alternative energy recovery methods must be considered when recirculation of air is prohibited.
This paper describes the energy recovery system installed in the Edmonton General Hospital at Edmonton, Alberta, Canada, and presents the results of an experimental study of the performance of this system.
The air conditioning system is designed to handle 102,000 cfm of air at an outdoor design temperature of -40 F and to exhaust 84,000 cfm of air at a room design condition of 80 F and 50% rh. The difference in volume is being used for contaminated make-up air and pressurization of the building. The system utilizes a spray washer with the appropriate heating and cooling coils to deliver air off the unit at a constant temperature, and terminal reheat is used throughout the building.
Citation: ASHRAE Transactions, Volume 77, Part 2, Washington, DC
Product Details
- Published:
- 1971
- Number of Pages:
- 7
- File Size:
- 1 file , 770 KB
- Product Code(s):
- D-WA-2198
