Document Dvkezxk8ee4Bzg61QKjBbv12o

8O Is 5 S < uj H in 2 O Oh 0$ < 03 _) < H 2 O N 5 o X os o U. O J 1s J Eo Gage Press. T emp, j H ot W ater 10 L b . 80 L b. 324 .0 deg. fahr. j 120 L b . 160 L b . 370.7 deg. fahr. 200 L b. 1 387.9 deg. fahr. 200 L b . and 100 D eg. 275 L b. and 250 D eg. Fahr. Superheat. Fahr. Superheat. 664.3 deg. fahr. 6460 . 12,220 ! 13,720 16,890 20,200 24.300 27,600 30,920 34.240 37,800 45.000 51,550 58.500 65,050 72.000 85.500 93.300 106,000 119,000 jq jad jjip jqej -Sap jad {Bauij jad n ra IbO-oOoOtaOJoOt^OoOooOoOoQiSOoot^^TfOoomioo coo>u3eo^oo(0040>oo'4aooeor-ico<oeo -HOJ04eo^}-u50<)t^ooao^c4hehouooomoe(*Nc oio> leo^ spunoj SSOq SJBJJOQ uq jad *uip jqej *8ap jad leauq jad o va l-OOiOMClNOOONiQOO^OO`SO`OQOONOtODOOwQOOOQ>O0 CDO ^ C4 O 00 OS C4 ** C4 0> CO C4 O CO Q riCCCOViOiOcOt-OO -- C4^COCO*-*MOC5 OOOOOOOQlOQiOOQ o -- tocsooeooocooso>oo*-i-'C4^'eoeo ^.-tctcte#^<`Q*ocoao,-'co'*'cDoo iec>3 spunorf o c IrSt S c o & oo 8.60 3440 12.56 , 5026 17.94 7175 22.10 8825 26.64 10,650 31.60 12,640 35.90 14,360 40.10 16,040 44.05 17,620 49.35 19.740 57.50 23,000; 66.25 26.500 74.75 29,900 83.50 33,400 97.50 39.000 109.30 43,700 119.40 47.740 135.00 54.000 151.20 60.500 1 487.9 deg. fahr. 2210 3230 4550 5600 6690 7945 9040 10,060 11,100 12,140! 14,420, 16.650 18,420 20,790 23,100 28,010 29.650 33,700 37,500 2010 2910 4165 5100 6100 7210 8200 9145 10,120 11,050 13,120 15,040 16,940 18,900 20,910 24,700 27,000 30,410 34,200 1805 2601 3710 4549 54601 6450 7322 8200 9025 9850 11,720 13,480 15,050 16.840 18,690 22,120 24,200 27,320 30,570 ssoq SJBIIOQ jq jad *jyip jqej 'Sap jad iBauq jad nva S38S88S82S88gH.D,00C'JCO<NcOr-iiOO3'<J,CCt-.`QCOCN-H,-'t'-C'3a> ^-1--> N C4 CO P5 eo ^ 3 <D !* oo o -<--I CO spunod ssoq SJBIJOQ nlOhO.WicOoho-C^OoO|A^|SooVoOoO>oOoCoSioNoOo>IoNiot' jq jad -yip jqej Sap jad (OdiHiOiOQCtOQCI'4l>0Q'A ^<OTjiOrti5TrioifiWNifiOOOCO aoc4t*^*AO^,ccc4(Dtom-HC5oO''cooocQ ' leauq Jad 'n-vg IBOO spunod ssoq sjeqoQ CiOSCN4N''J't-C44QifranOOCOOQC'aCOO,'N,CONC(8OQf-iO.--Q<5 ot--C'iocoocqOf-cNf-csr'-c*--<r-coio ^l^^4^HC4C4C4ClC<5CO'il<^>0<0t00 u jq jad *ytp jqej -Sap iad icauq jad n ra u5CO<OC'J-I'*CiQ`OQ*000 0H0>>-N<MDOO'9l(DCM;5rO-OO'4'NC4aOOQ)0a^-Q4>OOCNC^CO0 rt -- C^MOJCnCO-rJ'-rJ'iOOcCt^OOOOINec ToeJh jeo^ spunod o 8 CO sscrj sjeqoQ hiooon(Dhqqnoo>ooooqoq -4'<oc>~*o5'0K>no*'<eorNu5ocg(D jq jad *jjip jqBj *8ap jad l3uit jad *n*v8 OCOOMOO'OOQON'I'NOOOO L^-a--J.ClOOc^nJc'CoSr-O--T*rOcNaOr^<CNOOCt'-^-<WJ*OC^'iO-'^'Ci,^M^Jr'O-Q ^)^)^HC4etcococo^<oioh>aoa30<-4C<5 spunod SSCKJ 8JBJJOQ cNI'*CfN--OCOooa5occOol>o'o'Co,iCo^ceoOi-oHooCQ'lCk'iOrJ'oot'o-To}o< v -H^ -- rH-HCN!N(NCOCOTl-^>OOCP jq jad -jjip NNnitf'iOoa'PiSQin'OSQtsONO'fOiNtOiftQt.oOttiOfflNoio jqej -Sap jad C0e0$c'0,c00><*0ei?00^*000t,a& C (eauq jad *n*VH ^.^H_,C'4C'lCO'cJ<-t<O<CDt'-00C5O OM *o 1*0 spunod SS238S3SS88S888S88S w* -4WC'*eo eoco^* ^*o r-ooao--H-CO-rj"- O C0O4 sscrj sjb]joq <SiQ^'t-'I,t-'4(A<QiOiO^<OQO wcweoe4ecooN^He<eovw^ C4co^>oaocc0>O'-<<<'^cHO^.Ca'o4Co'Jc44Ca'4oCc'34C*3 jq jad jyip 8S83S8S888iS8SS88S8 jq^j 'Sap jad 3goc*^,r-Neoccsc'4t,*eocociC>cococo .c *TJ l^am] jad *n`va -H^-i^MNCS<NCOCOT}<iOOiOt>.CD I0 spunod u oCO SStn SJBIJOQ o<NnOb$XTi'fjO*NiOt~OO^i,QcoQoOOO0Q5iioOQirOoifilOO iarOC4iOCOOCOtOt->C4rCOOQiO^< Cn^NeOia*>o<AC^0HCr0-Ccol0*0e>0'4|0C'*ogo0cojo HHC4CQCO^|tOUaCOCO'^^iC4>0CO^ w uB. aN X: X; ^ Xs ; i = ; = ; = = : ^HXC4C4COCQ','4,ihh>gOOe4'4`t0OO 104 1566 2290 3190 3910 4660 5550 6325 7075 7790 8500 10,110 11,640 13.030 14,600 16,100 18,950 20.800 23,500 26.150 I n this table coal has been figured a t $4.00 per ton o f 2000 lb., 13,000 B .t.u. per lb. o f coal; labor, boiler-room expense, etc., taken a t S coal fired a t $5.00 per ton. Boiler efficiency taken a t 70 per cent; a ir tem p. 70 deg. fahr. Experim ental data obtained a t the M ellon In stitu te . AMERICAN SOCIETYOF HEATING & jp VENTILAT1N6 ENGINEERSGDfl)EjB23^ apparatus, 70 per cent boiler efficiency, and 13,000 B.t.u. per lb. The "dollars" column represents the money value of the coal used per 100 sq. ft. per month assuming coal at $4.00 per ton and boiler room expense at $1.00 per ton. TABLE 53. HEAT LOSS FROM UNINSULATED SURFACES Tempera ture Deg. Fahr. Heat Loss* B.t.u. Hot Air............................................................. Hot Water........................................................ Steam, 10-lb. gage.......................................... '* 80 " " ..... ..... ......................... " 120 " " ..................................... " 160 " " ....................................... " 200 .............. ........................................... " 200 " " and 100 fahr. superheat 120 180 239 324 350 371 388 488 1.95 2.04 2.29 2.76 2.92 3.05 3.15 3.88 Lbs. Coalper 100 St. Ft. per Month Dollars per 100 St. Ft. per . Month 770 1780 3065 5545 6480 7250 7950 12,830 1.92 4.45 7.65 13.86 16.22 18.13 19.87 32.05 B.t.u. per sq. ft. per deg. fahr. temp, difference per hour. CONDUCTIVITY OF INSULATING MATERIALS The conductivities in B.t.u. per square feet per hour per inch thick per degree fafrr. temperature difference of the various insulating materials are given in -Table 54. It should be emphasized that in this table all variables due to differences in thickness, different pipe sizes, and different air conditions, are eliminated. TABLE 54. CONDUCTIVITIES OF VARIOUS INSULATING MATERIALS Den sity lb. per Cu. Ft. Con duc tivity Temp. Diff. which Conductivity was Determined Authority Year Asbestos Sponge Felted Wool Felt....................... 85% Magnesia....... CaroceL. _ ................ Nonpareil H. P............. Plastic, 85% Magnesia AsbestoceL...................... Expanded Asbestos___ Indented......................... Molded Asbestos.......... Air Cell.......-.................. Vitribestos..................... Asbestos Fire relt........ Corkboard-- ................ Hair Felt.-...................... 23.80 16.24 17.20 21.70 17.43 12.16 22.49 21.24 29.86 11.70 29.73 26.59 9.90 17.00 0.468 0.521 0.54 0.54 0.543 0.587 0.596 0.598 0.686 0.778 0.802 1.087 1.093 0.304 0.246 300 deg. fahr. Vol. 37, Trans. A. S. M. E., p. 968 300 " * 300 " Vol. 40. Trans: A. S. M. E.. p. 667 300 " Vol. 37 Trans. A.S. M. E.. p. 968 300 /* 300 " 300 " 300 " 300 " 300 300 " 300 " 300 " 36 " Vol. 26 A. S. H. & V. E. Journal, p. 625 36 * 1915 1915 1918 1915 1915 1915 1915 1915 1915 1915 1915 1915 1915 1920 1920 HEAT LOSS FROM INSULATED SURFACES Fig. 51 gives the heat loss per square foot of pipe per hour of piping where the pipe is covered with 1 in. thick covering. Inasmuch as the heat loss per square foot of insulated pipe is somewhat dependent upon the pipe size it cannot be said that the data given by this figure is exact 105