IEA Solar Heating and Cooling Programm - NachhaltigWirtschaften.at
IEA Solar Heating and Cooling Programm - NachhaltigWirtschaften.at IEA Solar Heating and Cooling Programm - NachhaltigWirtschaften.at
IEA SHC Task 38 Solar Air Conditioning and Refrigeration Subtask C2-A, November 9, 2009 NTU number of transfer unit [-] S area [m 2 ] t time [s] T a T eq T i T m air temperature [K] equilibrium temperature [K] air temperature in the section i (i=1;9) [K] matrix temperature [K] u fluid velocity (m.s -1 ) V volume (m 3 ) w a W d humidity ratio of moist air. [Kg.Kg -1 dryair] water content of desiccant [Kg.Kg -1 desiccant] x variable [arbitrary] z coordinate in the fluid flow direction [m] Greek letters ε emissivity [dimensionless] γ i parameter used in the reduction of desiccant wheel equations [-] ∆λ parameter in the desiccant enthalpy [-] µ ratio of matrix mass over air mass [-] η cf efficiency of the counter flow heat exchanger [-] τα transmission-absorptance coefficient σ Stefan Boltzmann constant [W.K -4 m -2 ] ρ density [kg.m -3 ] λ conductivity [W.K -1 m -1 ] τ ro half period of rotation of the desiccant wheel [s] θ cylindrical coordinate or angular position [rd] Subscripts a air b buffer c condenser d desiccant eq equilibrium f fluid g glass i inlet H heat pipe page 24
IEA SHC Task 38 Solar Air Conditioning and Refrigeration Subtask C2-A, November 9, 2009 m p o reg sat matrix (sensible regenator) plate absorber outlet regeneration saturation Desiccant cooling principle A desiccant cooling installation operating under the conventional configuration (100% airchange rate), with corresponding changes in the air properties in the psychometric chart, is shown in Figure 1. 3 way valve m2 T1 Buffer 1 m1 Ti1 Heat exchanger Collectors m2 Ti2 i n m1 Tn 9 8 7 6 5 Regeneration Heat exchanger Evaporative coolers Building 1 2 3 4 Desiccant wheel Sensible heat regenerator Figure 1: Desiccant cooling system with corresponding evolution of air properties in the psychometric chart page 25
- Page 450 and 451: IEA SHC Task 38 Solar Air Condition
- Page 452 and 453: IEA SHC Task 38 Solar Air Condition
- Page 454 and 455: IEA SHC Task 38 Solar Air Condition
- Page 456 and 457: IEA SHC Task 38 Solar Air Condition
- Page 458 and 459: IEA SHC Task 38 Solar Air Condition
- Page 460 and 461: IEA SHC Task 38 Solar Air Condition
- Page 462 and 463: IEA SHC Task 38 Solar Air Condition
- Page 464 and 465: IEA SHC Task 38 Solar Air Condition
- Page 466 and 467: IEA SHC Task 38 Solar Air Condition
- Page 468 and 469: IEA SHC Task 38 Solar Air Condition
- Page 470 and 471: IEA SHC Task 38 Solar Air Condition
- Page 472 and 473: IEA SHC Task 38 Solar Air Condition
- Page 474 and 475: IEA SHC Task 38 Solar Air Condition
- Page 476 and 477: IEA SHC Task 38 Solar Air Condition
- Page 478 and 479: IEA SHC Task 38 Solar Air Condition
- Page 480 and 481: IEA SHC Task 38 Solar Air Condition
- Page 482 and 483: IEA SHC Task 38 Solar Air Condition
- Page 484 and 485: IEA SHC Task 38 Solar Air Condition
- Page 486 and 487: IEA SHC Task 38 Solar Air Condition
- Page 488 and 489: IEA SHC Task 38 Solar Air Condition
- Page 490 and 491: IEA SHC Task 38 Solar Air Condition
- Page 492 and 493: IEA SHC Task 38 Solar Air Condition
- Page 494 and 495: IEA SHC Task 38 Solar Air Condition
- Page 496 and 497: IEA SHC Task 38 Solar Air Condition
- Page 498 and 499: IEA SHC Task 38 Solar Air Condition
- Page 502 and 503: IEA SHC Task 38 Solar Air Condition
- Page 504 and 505: IEA SHC Task 38 Solar Air Condition
- Page 506 and 507: IEA SHC Task 38 Solar Air Condition
- Page 508 and 509: IEA SHC Task 38 Solar Air Condition
- Page 510 and 511: IEA SHC Task 38 Solar Air Condition
- Page 512 and 513: IEA SHC Task 38 Solar Air Condition
- Page 514 and 515: IEA SHC Task 38 Solar Air Condition
- Page 516 and 517: IEA SHC Task 38 Solar Air Condition
- Page 518 and 519: IEA SHC Task 38 Solar Air Condition
- Page 520 and 521: IEA SHC Task 38 Solar Air Condition
- Page 522 and 523: IEA SHC Task 38 Solar Air Condition
- Page 524 and 525: IEA SHC Task 38 Solar Air Condition
- Page 526 and 527: IEA SHC Task 38 Solar Air Condition
- Page 528 and 529: IEA SHC Task 38 Solar Air Condition
- Page 530 and 531: IEA SHC Task 38 Solar Air Condition
- Page 532 and 533: IEA SHC Task 38 Solar Air Condition
- Page 534 and 535: IEA SHC Task 38 Solar Air Condition
- Page 536 and 537: IEA SHC Task 38 Solar Air Condition
- Page 538 and 539: IEA SHC Task 38 Solar Air Condition
- Page 540 and 541: IEA SHC Task 38 Solar Air Condition
- Page 542 and 543: IEA SHC Task 38 Solar Air Condition
- Page 544 and 545: IEA SHC Task 38 Solar Air Condition
- Page 546 and 547: IEA SHC Task 38 Solar Air Condition
- Page 548 and 549: IEA SHC Task 38 Solar Air Condition
<strong>IEA</strong> SHC Task 38 <strong>Solar</strong> Air Conditioning <strong>and</strong> Refriger<strong>at</strong>ion Subtask C2-A, November 9, 2009<br />
m<br />
p<br />
o<br />
reg<br />
s<strong>at</strong><br />
m<strong>at</strong>rix (sensible regen<strong>at</strong>or)<br />
pl<strong>at</strong>e absorber<br />
outlet<br />
regener<strong>at</strong>ion<br />
s<strong>at</strong>ur<strong>at</strong>ion<br />
Desiccant cooling principle<br />
A desiccant cooling install<strong>at</strong>ion oper<strong>at</strong>ing under the conventional configur<strong>at</strong>ion (100% airchange<br />
r<strong>at</strong>e), with corresponding changes in the air properties in the psychometric chart, is<br />
shown in Figure 1.<br />
3 way<br />
valve<br />
m2<br />
T1<br />
Buffer<br />
1<br />
m1<br />
Ti1<br />
He<strong>at</strong><br />
exchanger<br />
Collectors<br />
m2<br />
Ti2<br />
i<br />
n<br />
m1<br />
Tn<br />
9<br />
8<br />
7<br />
6<br />
5<br />
Regener<strong>at</strong>ion<br />
He<strong>at</strong><br />
exchanger<br />
Evapor<strong>at</strong>ive<br />
coolers<br />
Building<br />
1<br />
2<br />
3<br />
4<br />
Desiccant<br />
wheel<br />
Sensible he<strong>at</strong><br />
regener<strong>at</strong>or<br />
Figure 1: Desiccant cooling system with corresponding evolution of air properties in the<br />
psychometric chart<br />
page 25
Change language