Document 3QzOXQMqZqay5G4XQGaVZk2Gy

5^2214. 'V,'5!>Sa American Society of Heating and Ventilating Engineers Guide, igjj| The effects of painting a six-section 32-in. three-column conduct^ found in recent tests are given in Table 2. r* Effect of Type and Height The results of tests (Fig. 2)1, conducted at the University of t|l;no with two types of radiators, lead to the following conclusions: 'Conld.eTnsheed hweiathtiinngthefefercatdoiaftaorr.adiator cannot be judged solely on the amount of , I,, i I T I | i | I 2-Ce/emn 7Z/pe ef'\ 2f?adr'afor//? /foom 2f4\ .(//is/s/c/e 7ernp. = Chapter 12- -Radiators and Convectors PRfffiZScltlssoej nEencralolseu^reesct ofiin",dOST P,ace4,fbout a radiator is to decrease Seamount of steam that the radiator will condense per hour and thus ^reduce the amount of heat given off by the radiator. The results of .investigations indicate that only where the enclosure is made &omch-bfgher than the heater, thereby producing a chimney effect, is the wtoii`di^ationTNutLeC1^a Wffeater than tbat f an identical radiator unenclosed. The heating effect of a given radiator is not always impaired . by.;Ueuse of an enclosure producing a reduction in the amount of steam 4condensedfoplelorphwrosduurr.ceesdulbtsy-manayenbcelo.spurroedaurceedd:ependent upon its desisgn' so I"-' K- eaIltfinBgectotamfdoirsttrainbdutilown eoref dthceehilienagt tbeemlopwertahteurebsre. athing line level to pomroaduucre greater 7(/pe offFof/o/osp ffoom 2/2, 0e/sAfs. ^We//7^bJJf/fee^^rp 'in frbam 2/4, &c/fefcfe 7en?/?.~-f-43fQ L' . S 6 7 3 v /6> fe/gf/ A&ove fVoor- /n fee/ Fig. 2. Air Temperature Gradients'1 from Floor to Ceiling for Column and Wall-Type Radiators aNote that all three radiators maintained about the same temperature at the Comfort Line. 2. High column radiators placed at the sides of window openings do not produce as comfortable heating effects as long, low, direct radiators placed beneath a window opening. 3. Smaller floor to ceiling temperature differentials can be maintained with long, low, direct radiators, than is possible with high, direct, column radiators. 4. High column and tubular types of direct radiators give the major portion of the floor to ceiling temperature differential above the breathing line level. 5. The comfort level (approximately 2 ft-6 in. above floor) is below the breathing line level (approximately 5 ft-0 in. above floor), and temperatures taken at the breathing line may not be indicative of the actual heating effect of a radiator in the room. The comfort indicating temperature should he taken below the breathing line level. The Effect of Two Types of Casl'Jron Steam Radiators in Room Heating, by Prof. A. C. Willard and M. K. Fahnestock, Heating, Piping and Air Conditioning, March, 19X0. 208 Heigh? Above A/oor />} Aeef it a Gradient and Steam Condensing Rate Fig. 3. Room FOR TR" aedmipaetroartuwrieth Well Designed Enclosure 1 2. The lessened steam consumption may not materially change the radiator heating ..performance.. Sb '"j3. The enclosed radiator may inadequately heat the space. V:. fCFhe heating effects3 of bare radiators, and radiators fitted with a well designed enclosure, a poorly designed enclosure, a well designed shield, , and a cloth cover, are shown by Figs. 3, 4, 5 and 6. v Fig. 3 illustrates the relative heating effects of a bare radiator and the . . effects produced with the radiator fitted with a well designed enclosure. ''Comparison of the curves reveals that the enclosed radiator used 13 per . cent less steam than the bare radiator, gave the same breathing line tem- perature, produced higher temperatures in the occupied zone, and gave '-^educed temperatures above the breathing level. This was a satisfactory - beating performance. Fig. 4 shows the unsatisfactory effects produced by of Enclosures on Radiator Performance, by A. P. ICratz and M. K. Fahnestock (A.S.H.V.E.; - r*trcan*s/1*aKcstftigoantisQ.nVoolf. H33e.a1li9n2g7)R. ooms tvith Direct Steam Radiators Equipped with Enclosures and Shields, .by.Ao C. Willard, A, P. Kratz, M. K. Fahnestock and S, Konzo (A.S.H.V.E. Transactions, Vol. 35,1929). : 209