Measurements of Effective Thermal Conductivity of CaCl2 Reactor Beds Used for Driving Chemical Heat Pumps.

Measurement of Thermophysical Property of Energy Storage System (CaCl<sub>2</sub>&#46NH<sub>3</sub> System)

“…The measured thermophysical properties ( λ and α ) were approximately 0.18 -0.20 W/(m•K) and 0.31 -0.33 × 10 −6 m 2 /s in the measuring temperature range of 285 -350 K, respectively. Wang et al [15] and Fujioka et al [16] reported the values of λ were approximately 0.110 -0.145 W/(m•K) at 0.1 MPa (300 -390 K) and 0.15 W/(m•K) at 0.1 MPa (283 or 293 K) for CaCl 2 powder alone, respectively. It seems that the difference in λ comes from the difference of the bulk density (ρ bulk ) or the void fraction of the specimen in the measurement cell.…”

“…The measured thermophysical properties ( λ and α ) were approximately 0.08 -0.11 W/(m•K) and 0.11 -0.14 × 10 −6 m 2 /s in the measuring temperature range of 290 -350 K, respectively. Fujioka et al [16] reported the value of λ was approximately 0.06 W/(m•K) for CaCl 2 •8NH 3 at the equilibrium pressure (283 or 293 K). Similar to the value of λ for CaCl 2 •4NH 3 , it seems that the value of λ in this measurement is close to the value of λ in Fujioka et al [16].…”

“…This is due to the difference of ρ bulk of the specimen in the measurement cell (CaCl 2 •4NH 3 : ρ bulk = 232 kg/m 3 , CaCl 2 powder alone: ρ bulk = 860 kg/m 3 ). According to Fujioka et al [16], it was reported that the value of λ was approximately 0.05W/(m•K) for CaCl 2 •4NH 3 at the equilibrium pressure (283 or 293 K). It seems that the value of λ in this measurement is close to the value of λ in Fujioka et al [16].…”

“…According to Fujioka et al [16], it was reported that the value of λ was approximately 0.05W/(m•K) for CaCl 2 •4NH 3 at the equilibrium pressure (283 or 293 K). It seems that the value of λ in this measurement is close to the value of λ in Fujioka et al [16]. Figure 8 shows the relation between λ and α of CaCl 2 •8NH 3 and temperature.…”

Composite reactants of calcium chloride combined with functional carbon materials for chemical heat pumps

“…The simulation was performed for the CaCl 2 and CH 3 NH 2 reaction couple [17]. Kunii-Smith equation for packed bed [18] was modified so that it could be extended to a bed packed with composite particles of CaCl 2 and expanded graphite.…”