Document ba27jk9ammMQvR3ZwQZo3DVX6

\ sub-basement, second, sixth, seventh, eighth and penthouse floors. The seventh-floor fan room serves the primary* air system for hotel guest rooms. A cooling tower on the roof provides condensing service for circulating cool* htg water to the centrifugal compressor condensers. This tower can cool 4500 gpm of water from 95 to 85 F at a peak outside wet bulb of 78 F. It is a twin cell, induced*droft unit of all* steel construction with double-deck spray head*--one bank with and one opposed to the air stream. Three 2250-gpm pumps, including one standby, located in the sub*base* ment deliver et a 130*ft head, circulot* ing water to the tower. Fan Rooms. Conventional alr-condi* tioning apparatus in fan rooms indudo (1) centrifugal-type fans, both single and double inlet (2) steam preheater . and reheater coils (3) spray-coil do* humidifiers (4) electrostatic air filters. Four separate systems, employing a positive combination return and ex* haust fan in addition to a supply fan, operate from a typical fan room. These combination return-ond-ezlmust tons balance supply air to the space and remove exhaust from toilets, etc. Air supplies for spaee needs indudo ven* tilation plus exhaust losses. Ventilation presents somewhat of a problem. Usually additional air must he introduced to system circulation to moke up for exfiltration lessee. The * vault-like construction of the window* less store changes the exfiltrstion factor considerably. The balanced combina tion return and exhaust fans furnish a solution to this situation. The typical fan room acts as an ex haust plenum since the four positive return-exhaust fans spill excess air there. Propeller-type Ians in the south wall draw this excess elr out Filtering Air. All air posses through filters. A system of auxiliary returnair dampers reintroduces some return air to a portion of the electrostatic filters. The amount of dual duty these filters serve depends upon the amount of ventilation. Savinga in both spaeo and money result -from this ability to set up a dual-duty service. Controls for sR systems operating from a typical main fan room ere pneumatic. Every effort was made to reduce these controls to thefr simplest form. . For instance, positive-acting dampers operate in all cases except for .space-temperature control. In this serv ice, face and.bypass-dampers.are used.The po*iliv*aciihg. damper gives on almost constant air flow, which ellminates'the.need for static pressure regu* lation used on modulating dampers. Carrying out this simplification idea further, no 3-woy valves have been put in the chilled-water circuit at the spray-coil dehumidifiers. Instead, a bal ance for a water flow to meet peak load was set in the field and is held con stant by lubricated plug cocks. This holds the hydreulic'eystem constant A manual-control arrangement in the basement regulates chilled-water tem perature on a schedule based on out side wet-bulb temperatures. As the wet bulb increases, water temperature lowera, end vice verse. Tills results in sn approximate dewpoint sufficiently accurate for summer-humidity control. Practically all thermoelata hove been located in the fan rooms rSther than In occupied areas. This makes controls more accessible to the operator and less so to the tenant since it is felt that better over-all operation results. Store Controls. Control system (or store space includes: (1) rctum-air thermostat for operation of dampers (face and bypass) and steam reheater coil in sequence (2) thermostat on dehumidifier leaving side to modulate steam preheaters for o dewpoint of about 40 F (3) return air hygrostat for maintaining winter-humidity limit at 35% by controlling recirculating spray pumps (4) safety thermostat next to the dewpoint thermostat, set at 38 F to shut down the supply fan in ease of steam preheater failure and keep the water coll from freezing (S) pressure electric switches to start re turn-air fans, propeller-type exhaust fans and electrostatic filters when tha supply fan starts. The return-air thermostat with o fall in temperature causes the face damper to close to its minimum position after which the reheater valve opens. A rise in temperature brings about the re- verse. This cycle works both winter and summer. Sprayed coils moke tho dehumidifiers a cooling source whether or not chilled water is circulating through the coils. Guest Rooms. A 3-element conduit setup supplies air conditioning (or - guest rooms. Theso elements are a primary-sir system, e water-circulating arrangement ond an outlet unit under the windows in eoch guest room. ; The primary-air system originates in the seventh-floor fan room. It bos two seporate zone fans, north ond south. - This apparatus provides the necessary * outside air for ventilation treated a^ -, cording to season--humidified In win* * ter, dehumidified in summer. , Conditioned outside otr goes through o series of round headers, which dls* .J, tributo it to the perimeter of the build- > ing. Risers in the center of eaeh bay take it up the building. A typical riser j serves two units per floor by means of j, branch runouts, which deliver primary j air to the unit base. . Two zone pumps--one each for north j- n (mi POWER July 1449 i and south--feed hot or cold water to -the coils of the window units, Fig. 4, -in accordance with summer-cooling or -winter-heating demands. Both cycles use modulated water temperatures in -accordance with exposure demand by means of 3-way pneumatic control valves, actuated by outside-zone thermo, stats. These outside-zone thermostats automatically position summer and win ter S-way valves to give required cool ing or heating. Such a control regu lates water temperature to windows in a sene in keeping with the actual re quirements of eiposure as they develop. A manual control on the unit in each room permits the occupant to regulate water flow through that particular coiL Primary-air flow across these coils is sues from high-velocity jets In the mixing staek. The action of the jets sets up an induced draft that pulls room oir across the colls at a volume of about three times that from the jets themselves. Both streams --air-jet-propelted primary air plus induced room elr--mix and discharge through the grille in the window stool. Chief advantages of the hotel-room system described are: (1) Each room is independent. No return air circu lates so odors are not recirculated. Out side air from the room-unit exhausts through the bathroom, thus isolating the room. (2) Air circulation stays constant despite load fluctuation.-Waterflow changes meet these load variations. So a constant pattern of sir distribu tion, as well as adequate ventilation, results. (3) Guest can regulate tem perature to suit his own taste. (4) Absence of horizontal duets with a ver tical distribution system made possible 9-fl 9-in. floor-to-fioor rooms to give one additional floor within the limits estab lished hy the building zone ordinance. Hotel corridors have a separate con ventional supply and exhaust system for the small amount of cooling and ventilation they need. PRINCIPAL REFRIGERATION AND AIR-CONDITIONING EQUIPMENT Terrace Plaza Hotel at Cincinnati, Ohio RBPRtOBRATION EQUIPMENT, AUXILIARIES Caturitugnl compressors ............................................................. Cotrlet Cere 1 (too. SSO ana ISO tana) motor drive* through |Mf redueere Compressor motors........................................Croelrr-Whoolrr Eire Mix Co * (tOO, 600 and ISO hp) around retor, I ISO rpm, Z9S v, S phase. SO tftla Otor reducers....................................................................................... P*1b Crp S (TOO bp. me to 3610 rpm;.000 hp, 1771 to 4999 rpm: ISO hp. m to sm rpm) Motor mtttn................................................................... Cuilor-Hammor, to* drum controllers, S balanced points Pumps, s, 1100 gpm, 6041 hotd, SS-hp motor*.......... Peerless Pump PI* Ob* acts os standby serving IS-(n. loop; cMIlsd-wetsr servtcs TOBp*. 4. 000 (pm. IQ-fi hood, tS-hp motor*.......... Pacrlaas Pomp D! * toreo stores, t tho hotel, 1 standby; chlllvd-wsttr sortie* p,rin ...............................................................................................CorHor Corp t>*(n. moin chlllod wotor loop; 104s. otoroo oupply and return; Mo. hotel oupply ood return oil ehilltd-wottr aefrict Volvti. chlllad-wotcr sortie*..................................................Wm Powtll Co Pumpo, Z. Wesihormastor................................................Poortaso Pump Div Worts *ono; 160 gph, 60-ft hood, ?|-hp motor. South ease; SIS (ph, 'Ml hood, I0*bp motor ' oTS?* ** `dealing wotor..........................................Pteri*ti Pump Dl* *5,7 tea. Itt-ft boad, 100-ftp motor. Ooo otto at standby uooHa| tower, cendaaslog wotor.................................... Motloy Co, too Udutod droit, oil oloot. 4MO eph PANS '"'".l-* .............................. . . ..Puffelo Perge Co 4 . * rlun--eahaiut centrifugal typo, |); total 211,000 cfm; 4 double Inlet, II tingle Inlet "PPly centrifugal typo, IS; toonut SSI.SOO elm, S doubts Inlet. * thfU Inlet -Supply too*. Wootaormooior, 2; total 20,144 cfm--high-speed eentrlfa(il bS*y duty Spill-duty propeller euhautt, t; total M.TM cfm Ventilation fnus...................................................................... Buffalo Forgo Co Sopply^entrifugal typo, l| toul 111,POP cfm, oluglo lolot Boftauot--centrifugal typo, 2V; totsl 244.P20 cfm.'olnglo lolot Supply and oftsutI--propeller typo, I; total 11,000 cfm DBHUMtDIPIBRfl, HBATBRB AND AUXILIARIES Dehumfdlflors .................................................................................. Carrier Corp 21; Typo 20 R eprty coil dahumldlltsre with S-row S-poa colls, totd 276,600 cfm dch air Steam colls.........................................................................................AoroSn Corp Bloom proHoiUte--distributing.lobe Typo P, 46 Bloom rohoutore distributing-tab* Typo P, 97 Unit hooters........................................................................................Cartier Corp Centrifugal-fan typo, 16; propollor-fao typo. 9 Dellere............................................................................. Bibcock t WIlcou Co I; 2M ptl. 90.000 lb par hr, goo or ell fired Bloctrosutlc-typo filter*................................ Americas Air Filter Co, Ine 16. total 414.000 cfm Multipart*! oil Alton--trovollogrecrecn typo, 1. totsl 60000 cfm American Air Filter Co. lae Banka of Throaway-typo Slitr*.................. Owons Corning Ftborgloa Co 6. total 91,000 cfm Therraoatat*......................................................................... Johnson Service Co 01: 16 dewpoint typo la apparatus, 21 duct typo la return air 44 room type tlygroams........................................................................... Johnson Service Co 19; II duct type in return air, 4 room typo Radiant beating--Oourmet Room........................................ B J Nolan Corp 1700 llocal ft of l-ln. wsldad pipe with 409 *9 ft of eurfaee CONSULTING BNOIN8BR6 Hotting, ventilating, air conditioning...................Juroa, Baum A Bellas IPOWU July 1949 0951 r<