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"DUNHAM -BUSH SAVES A MONTGOMERY WARD STORE 3580 PER YEAR IN AIR-CONDITIONING COSTS "

(A case History:Direct Expansion (DX) System vs. Chilled Water System)

Lower operating costs is just one of the reason why Montgomery Ward has a Dunham -Bush Direct Expansion Air-Conditioning Systems. The figure above is at today power costs. Heart of the system is a pair of Dunham -Bush DBX Rotary Screw Compressors rates at 200 tons each. Both are piped to a single 400-ton " field built -up " coil bank with con­trols for six cooling zones. The screw compressors provide stable opera­tion over the operating range, down to 10 percent to full load.This means faster response, closer controls of air temperature and humidity, less en­ergy consumption. Using a direct expansion system instead of chilled wa­ter eliminates water pumps and their associated costs. Evaporative con­densers instead of the conventional cooling tower means reduced 'make­up " water and water treatment costs no water cooled condenser mainte­nance and reduced pumping costs.

AIR-CONDITIONING CRITERIA.

1. 400-ton full load requirement at 95 degrees F design ambient

2. 3,900 hours annual operating season

3. 6 cooling zones

4. second floors equipment room with adjacent fan room