EP 1570214 A1 20050907 - HEAT EXCHANGER FOR USE WITH OSCILLATING FLUIDS IN PARTICULAR IN A THERMOACOUSTIC CELL
Title (en)
HEAT EXCHANGER FOR USE WITH OSCILLATING FLUIDS IN PARTICULAR IN A THERMOACOUSTIC CELL
Title (de)
WÄRMETAUSCHER ZUR VERWENDUNG IN OSZILLIERENDEN STRÖMUNGSMEDIEN, INSBESONDERE IN THERMO-AKUSTISCHER ZELLE
Title (fr)
ECHANGEUR DE CHALEUR POUR APPLICATION AUX FLUIDES OSCILLANTS NOTAMMENT DANS UNE CELLULE THERMOACOUSTIQUE
Publication
Application
Priority
- FR 0303591 W 20031204
- FR 0215296 A 20021204
Abstract (en)
[origin: FR2848293A1] A heat exchanger has an exchange surface S made of unitary elements of dimension Lc with heat exchange approximatelyF between a primary fluid at temperature Tf and a secondary fluid giving a wall temperature Ts, such that approximatelyF/(Tf - Ts) = S.C.A.F.Lcn, where F and A are characteristics respectively of the primary fluid and the acoustic wave, and C and n are both characteristics of the type of flow The associated Reynolds number RELc is between 3 x 10 power 3 and 3 x 10 power 5 and the passage dimensions D much greater than the thickness of the thermal layer limit deltak along the walls of the exchanger. The exchanger is made of a bundle of tubes of diameter D or of parallel plates spaced at a distance D and the constant C is 2.06 and the power n is -1/2. F = lambda.Pr(-1/6) where lambda is the thermal conductivity coefficient of the primary fluid and Pr its Prandtl number. A = (2.(ul)1/2/deltakx(omega)1/2)1/2 where ul is the particular speed and omega the pulsation. Alternatively, the associated Reynolds number ReLc is greater than 3 x 10 power 5 and the passage dimensions D much greater than the thickness of the thermal layer limit deltak along the walls of the exchanger. In this case, C is 0.118 and n is -1/5. F = lambda.Pr(7/15) and A = 2(4/5).(ul)(4/5)/(deltak(8/5).omega(4/5). An Independent claim is included for a thermal machine operating with an oscillating fluid containing at least one head exchanger as described above, and at least one thermoacoustic cell.
IPC 1-7
IPC 8 full level
F25B 9/14 (2006.01)
CPC (source: EP)
F25B 9/14 (2013.01); F25B 9/145 (2013.01); F25B 2309/1407 (2013.01); F25B 2309/1412 (2013.01)
Citation (search report)
See references of WO 2004053405A1
Designated contracting state (EPC)
AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IT LI LU MC NL PT RO SE SI SK TR
DOCDB simple family (publication)
FR 2848293 A1 20040611; FR 2848293 B1 20070914; AU 2003298414 A1 20040630; EP 1570214 A1 20050907; WO 2004053405 A1 20040624; WO 2004053405 B1 20040916
DOCDB simple family (application)
FR 0215296 A 20021204; AU 2003298414 A 20031204; EP 03796162 A 20031204; FR 0303591 W 20031204