Document 06ozJ7EEYK2KmYdv0kwVZX1mn

1 2Fifteen factory-built olr conditioning units, above, were selected ,to fit avoliobla arco and height In stock areas Coil connections to olr conditioning units, above, supp1 chilled water to -cool olr distributed through the st Department Stores Requirf Usual storo experience involves rearrangement of the sales PtirstCAL layout of a departn store is never constant. It starts floors. But here's one deportment store that manages to.ob- change even before it to-finiahed,`|[ tain the necessary flexibility by using unit air conditioners cooled by chilled water from a central refrigerating system ever is finished. Take Burdlnes,;! of Fort Lauderdale, Florida. |\ now, although it to a 3-story buildia recent erection, provision has alrtf been made for an additional three fl* Of T W REYNOLDS, Chief, Air Conditioning Dlv, Abbott, Merit 4 Co In this store there eeetned to be. n than the usual limitations In head;.. , ond available floor area for duets.' equipment' These restrictions led the use of small air-distribution cent and factory-built air-conditioning on at 15 points throughout the buildi Fig. 1 and '2, with cooling obtained chilled water from a central refrj ating system on the roof. Fig. 7. 'J. Conditioned air from the air-co tloning units Is distributed by me* abort runs of small ducts, each necled to a limited number of < supply outlets. Main runs of parallel the deepest beams and shs| branches supply outlets crossing | Fig. 9. Capacity of the eir-condido units was sot by (1) area and M available for them in stock areas^ quantity of air the main duct from, unit could supply in the limited f of hung 'ceilings without air-vel" producing noise. Available proved so tight that the engine0, necessity combined ail mechanical, ices on one coordinated plan, f Typical floor plan for ductwork has moln runs parallel to ond between deepest this, at his shop in the metwp .beams with the short, shallow bronchos to the oir outlets crossing these booms area of New York, the sheewnet*/, 11 |524) POWER September I 4 Fitting rooms, Ilka those at the left, illustrate the problem of supplying air r No return ducts as such era used, conditioning to partitioned spaces thor ore always subject to rearrangement u Plenum chamber serves meizanlno Flexible Air Conditioning (rector worked in assembling the ducts in sections. Notwithstanding all this, r.. they fit when put in place. ' - Filing ike load. The ilem of. di versity (actor, usually set at 60%, did -.'.not figure in calculating'compressor t ..load, The effect that lights and people PW on diversity factor in an installs- ,uch as this--only three floors and -equipped with escalators--does not amount to much. Because of this, the total connected load and operating load were held to bo one ond the same. But compressor selection Involved another step--o rough estimate of ex pected load when the additional three floors ere added. This resulted in pick ing a 540-ton compressor, Fig. 7. Us selection came about for these reasons: (1) Excess tonnage above the presently required 455-ton capacity cost only about 60% per ton of the quoted price per ton for a 455-ton unit (2) Esti mated total tonnage of 675 tons whenthe store is enlarged could be met with a 540-tpn compressor operating on tho usual 80% diversity factor. Incident- * ,n on<) orranged In raws ora enough for both tho present ond future conditions //*** SapUmfc,, 1948 "7 Chilled water for cooling olr In unit olr' eondittonc I comes from central refrigerating compressor on roof t( (427)