Document gbK9GMdZy2o8q8wOLEa8E4389

536 CHAPTER 28 1965 Guide rAnd'Data'Book /:? i Table 9 .:Rapid-Selection for, +35 F Storage Room . . --J.-?: taatf os 9 ft ouMdi height, 4 ia-'cork or qd bmdotioa, 95 F outride temperature, oo mo effect. (Stage toad* boxed oa foble 6. Do not ote thh "Ootadt dJatadoa Bto/hr for 16-hr operation . Average service Heavy service. >;- 6fw/hr for I64tr operaboa Averoge service Heavy service 6X5 . 6X6 V: .. 77XX56.- 7X7 : j ; .,, *;- 2,580' ' : .2,960'- ; 2,930 ` 3,380- = 3,790 . ! -: 3,180 3^540 3,540 4,080 4k620 : 14X10 ,14X12 1. *14X14 ' -10X8 ' ! 16X10. 8,640 9,720 10,800 8,140 - 9,340 ' 10,900 . 12,300 13,700 : 10,000 12,000 .- : ' ', i: 8X5 : 8X6 ! 8X7: . 98Xx86 *; ... ; 1 3,240 r 3,710 4,200' 4,680 4,080 3,920 4,530 5,170 5,680 4,960 16X12 "' 16X14 ; 16X16' , isxio' : 18X12 - 10,700 : 12,000 * 13,100 -- : ; 10,300: - - ! 11,700 : 13,450 ' 15,000 16,600 : 13,000 14,800 ;;i 9x7 V 9X8 ' : 9X9 V' , 10X6 : iox7 - -. ' ' j. 4,600' ` 5,080 5,580 4,450 1 5,010, '5,640 !' `6,260 : '6,920 - : 5,450 1 - ;6,200-' 18X14 18X16 *' 18X18 20X10 -. 20X12. ' ; , 13,100 ' 14,400 : 15,800 ! 11,300 . * : 12.800"-.- . 16,400 : 17,400 ; 19,600 . ! 13,700 ; 15,700 ... ; iox8 iox9 10X10 11X6 ; : 11X7 : 11X8 - . 11X9 . 11X10 ` . , . ; 12X6 . .- 12X8 12X10 ,12X12 ; 14X8 . . 5,520 ; 6,080 6,630 : ' 4,820'. 5,380. 6,000 ` . 6,520 ' 7,100 5,150 : 6,400 7,590 8,8007,300. -; 6,880 7,520 : 8,150 /i - 5,910 1 . 6,630 . ' * 7,350 8,050 * 8,800 - !: 6,350 -;;' . ! 7,700;' ! 9,380 ; io,8oo 9,050 20X14 20X16 20X18 20X20 22X12 22X14 22X16 ' ' 22X18! ` 24X12 24X14 " 24X16` 24X18 \ : 14,300 - . 15,600'. "1 i 17,000 -* ' ! 18,700- 13,700 ' ' ' ; 15,300 ' : 16,800 18,300 ' 14,700 - ; 16,200 17,300 ' . 19,300 ' : 17,600 19,400 ' 21,100 22,700 17,100 : 18,900 20,800 ; 22,000 18,200 20,300 22,100 24,000 15 X 10X-8ft (outside dimensions)- with 3ia.'cork-insulation. : lie ambient'temperature is-95 F and the storage temperature is l 65 F. The product, 8000'lb of bananas, to be stored, enters the room at 65 F.-Tte electrical load is 300 watts.-' . -U -Solution: The outside surface area is'700 sq'ft. From Tabled,`` the beat gain factor is 2.4 Btu per (sq ft) (F deg) (24 hr). The wall' beat gain is 700 X 30 X 2.4 = 50,400 Btu per 24 hr. : ' ; '< iJ Tie internal volume of the room is 14 X 9 X 7 -- 882 cu*ft. From'Table 4,19 air changes will occur m 24 hr: -The heat 're-'1, mured to cool air from 95 F to 65 F is 1.54 Btu per cu ft. Thus, the air change load is 882 X 19 X 1-54 -- 25,500 Btu per 24 hr. The heat of respiration of from Table 4 of Chapter 69, is 8,380 Btu'per (24 hr) (ton). The product load;' therefore} is 8,360 X-8000/2000 '= 33,400 Btu per 24 hr. ' ^ ' The electrical load is 300 X.3.41 X 24 - 24,600 Btu'per 24 hr. - Wallgain Air change, -; Product Electrical `^ ' j. - - -- * 10% Safety Factor Total Load -i -< Btu feb 24 Hi >50,400 " .* 125,500 -33,400 24,600 133,900 ' 13,400 i -I .-147;300 ' CHAPTER 29 SPACE AIR DISTRIBUTION DeftnHtons, Standards far Satisfactory Conditions. Principles of Air Distribution, Isothermal Axial flow Jets, Isothermal Radial How Jets, Nomsothermal Axial Flow Jets, Vertically Projected Heated and Chilled Jets, Dad Arrangements, Return and-: i ':-f-- . Exhaust Intakes. Balancing the System ORRECT air distribution is essential in warm air heat 9. `Entramment: The ` entrainment . of room air by air C ing, . ventilating, - and air-conditioning systems. Even Stream discharged from the OUtirt'(rrrrirr*inty-r<Jl>d Wvm/frtry though a system delivers the required quantity of conditioned otr motion).. -j . - . . ; air to a=rbom, unsatisfactory conditions result.if;the air is 10. Entrainment-. Ratio: The. totals air divided'' by the - dis charged air............ , .. poorly distributed. .'.f*~ This^chapter deals with'room air distribution only, and dis .'ll- Envelope: The outer;boundary of an,air.stream moving at a perceptible velocity.',,., ............ ,, `_.t cusses: (1) standardsfor satisfactory conditions/^) principles of air distribution, (3) outlet performance and selection, and 12. Exhaust Opening or Intake: Any opening, through which air is removed from a space which is being heated, cooled, (4);retain;'and .exhaust .intakes; ".-The transmission. of air humidified, dehumidified; or.ventilated... - -. ^ / through ducts is treated in Chapter. 31, Air Duct Design. Chapter 30 deals with Air Diffusing Equipment. 13. Free Area: The total minimum area of the openings io the air outlet or inlet through which air ean juma Further pertinent information on air distribution will be found-in.Chapter.7, Physiological Principles;.Chapter..T4, Sound Control; Chapter 16, Measurement Instruments; Chapter,54,.Unit Ventilators and Unit Heaters; and Chapter 65,'.Umtary_Air.Conditioners. ; 14. Grille: A covering for any opening and through which air passes. . - >. v 15. Induction: The induction of room air drawn into an outlet by- the primary air stream1 (commonly called aspiration).'.' " 16. Outlet Velocity: The'average velocity of air emerging from the outlet, measured in the plane of the opening. ` *n ?:*v*V.T; The following definitions referring to air distribution'equip ment have gained generalaooeptance.' 17. Plague: A ceiling outlet in' which the supply air jmnhtgmi against a plate- or. series of -parallel] plates,. nH ig d<*Ucted horizontally in all directions. . ; 18. Primary Air: The air delivered to the outlet-by the sup ply duct. ' ( 1. Aspect Ratio: The ratio of.length to width,`'of anopeninv or coreof a'grille. J !:' ` m -.*iw "6 C&Jfcieni of Discharge: Ratio of area it vena contracta'tO area of opening..: n.- > ft: l ; , 19. Radius of Diffusion: The horizontal dintanr-* from11the diffuser: outlet-to the perimeter of the space,''within which air motion m.the occupied sone-is;reduced to 50 fpm maximum.'1 "-J .20. Register: A grille equipped with a damper or control valve.: .-21.- Rise.-.The.converse of drop: - --rry:TMi " unea .tangent to me < opening through which air can paas-j 22. Room Velocity: The residual air velocity level in the occu- pied zone of the conditioned space, i.e., 65, 50, 35.fpm. . used to vary, the volume of air.paasin *fined. cross-section by varying, the .cross-eectiom 23. Spread:.,The divergence of^the air stream;in:a horizontal or vertical plane after it leaves the outlet. .. dichP8 -ppiy in 16. -Diffusion:; Distribution of air within a space by an out t oiscnargmg supply air.in various directions and planes. , 24. Supply Opening or Outiri.'.Any opening through which air is delivered into a space which is bong heated, cooled, humidi fied, dehumidified, or ventilated.' ; :: - :`M 25.. Temperature Differential: Temperature difference be tween primary and room air.' .:/* ` .- -i - ! : distance,, the lower edge of a hori ed of l^throw*- ^ 8tream ^P3: krfween the1 outlet and th "26. Temperature Variation: Temperature: difference-between- points of the same space. -.---j..-. > throuflfA^03/ net.fea of an outlet or inlet devic 27. Terminal Velocity: .The .average.air, stream; velocity at the end of the throw. ........... to "" f??u* 28. Throw (Blots).* The horizontal or vertical Til Hjrfmwx. an air stream travels on leaving the outlet (grille) before the maximum velocity is reduced to 50 fpm. TC 4.1, Duet De- 29. Total Air: The mixture of discharged air and entrained air. /' 537