THERMAL DESTRATIFICATION IN ROCK BEDS

被引：10

作者：

SULLIVAN, HF

HOLLANDS, KGT

SHEWEN, EC

机构：

[1] Univ of Waterloo, Mechanical, Engineering Dep, Waterloo, Ont, Can, Univ of Waterloo, Mechanical Engineering Dep, Waterloo, Ont, Can

来源：

SOLAR ENERGY | 1984年 / 33卷 / 02期

关键词：

CONCLUSIONS DESTRATIFICATION TEST In conclusiont he measuremenotsf this paper indicate The destratificatiotne st consisteds imply of halting a that: wave progressiont est after the wavefrontc entre had (i) Natural convectioins not a major contributotro the progressesdo mep redetermindeids tance---genera1l/l4y, 1/2 destratificatiopnr ocessi n a rock bed, even a rock bed or 3/4 bed heights--fromth ei nletp lane,s implyb y stopping havingt he low hydraulicr esistancoef 29 mm rocks. the forcedf low of air and sealingt heinlet and outletp orts (ii) Computers imulationo f rock beds in solar heating to the bed. The subsequentte mperatureh istory was systemcsa n safelyi gnoren aturalc onvectionM. oreoveri,f recordeda t hourly intervalsb y meanso f a data logger. the longestti methe rock bed is allowedt o idle is abouto ne Figure2 showst hed estratificatioonf the normally-charged day, destratificatiodnu eto bed conductivitcya nbe ignored 18m mrock bed for the casew heret hew avefroncte ntreh ad with little error. Howeveri,f longeri dle timesa reexpected progresse1d/ 2 the bed heightw henthe airflow was halted. (sucha smay occuri n seasonaslt orageo f solare nergy)b, ed The profilesi n T,, immediatelayf terh alting( indicatedb y conductivitmy ustbe includedin the computemr odel. 0 hr) and thosea fter8 3 ks (24 hr), 173k s (48 hr), and 540k s (iii) Designerso f solar systemsc an safelya rranget heir (150h r) are shown.C omparablree sultsw ereo btaineda fter ducting for either normal-or reverse-chargincgh,o osing wavep rogressionosf 1/4 and 3/4 bed heightsO. nly a slight whicheveirs more convenient(T. his resultw as anticipated degradatioonf the profilei s notedi n the first 86 ks, but this to somee xtentb y Lof who used reversec hargingin a tall, degradationb ecomesm ore pronouncedw ith increasing narrow bed in his house[ll1,2 ]b; ut whethert his result time; and by 540k s the bed is almost at uniform tem- could be extrapolatetdo cubic-likes hapedb eds has re-peratureT. he temperaturceh angesa t the top-mospt artof maineda mattero f doubt.) the bed; t o a deptho f about0 .3m; weres hownt o be caused by heatl ossesth roughth e0.1 m slabo f polystyren(eth ermal resistanceeq ualt o 4 m2K/W) whichi nsulatedth etop of the container. The bed thermacl onductivitky b of the 18m m rock was measuredin a guardedh ot ring apparatuus singa 0.1 m thick by 0.3 x 0.6 m cross-sections ample; yielding kb = 0.49+ 0.03W /mK. With suitablev aluesof the rock specific heat (920J /kg K) and superficial density Acknowledgements--Thaeu thorsa re indebtedto the following people; e achof whom in varyingw ayshave con-tributedto this projectA: . R. BalakrishnanD; BowmanR; Chagnon; K; Iynkaran; M; Kaptein; R; Sellens; J . Zwart and P. L. SilvestonT. he authorsw ouldalso like to gratefully acknowledgteh e financial support of the National ResearchC ouncil Canada through two contracts:N o. OSU79-00196a nd No. 11SQ-31040-7-4410;

D O I：

10.1016/0038-092X(84)90242-1

中图分类号：

TE [石油、天然气工业]; TK [能源与动力工程];

学科分类号：

0807 ; 0820 ;

摘要：

引用

页码：227 / 229

页数：3

共 12 条

[1] EFFECT OF THERMAL CONDUCTIVITY OF PACKING MATERIAL ON TRANSIENT HEAT TRANSFER IN A FIXED BED [J].

HANDLEY, D ;

HEGGS, PJ .

INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER, 1969, 12 (05) :549-&

[2] FLOW UNIFORMITY IN ROCK BEDS [J].

HOLLANDS, KGT ;

SULLIVAN, HF ;

SHEWEN, EC .

SOLAR ENERGY, 1984, 32 (03) :343-348

[3]

HOLLANDS KGT, 1984, SOLAR ENERGY, V33, P225

[4]

HOLLANDS KGT, 1981, SOLAR ENERGY CONVERS, V2, P65

[5]

HOLLANDS KGT, 1971, I ENG MECH CHEM ENG, P66

[6] UNSTEADY-STATE HEAT TRANSFER BETWEEN AIR AND LOOSE SOLIDS [J].

LOF, GOG ;

HAWLEY, RW .

INDUSTRIAL AND ENGINEERING CHEMISTRY, 1948, 40 (06) :1061-1070

[7]

LOF GOG, 1977, APPLICATIONS SOLAR E, pCH12

[8]

LOF GOG, 1981, COMMUNICATION

[9] ANALYTICAL SOLUTION FOR THE MULTIDIMENSIONAL DEGRADATION OF A PACKED-BED THERMOCLINE [J].

MARGOLIS, SB .

JOURNAL OF THE FRANKLIN INSTITUTE-ENGINEERING AND APPLIED MATHEMATICS, 1979, 307 (01) :39-58

[10]

MUMMA SA, ASME76HT73 PAP

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