Fig. 2: Heat shuttling effect in the backward scenario.
From: Observation of heat pumping effect by radiative shuttling
a Emissivity of VO2 (300 nm)/Si(200 μm) slab with respect to temperature during heating and cooling processes. Crosses correspond to experimental measurements. The inset gives the measured emissivity spectra at various temperatures. b–d Measured (solid line) and calculated (dotted line) temperature of the left slab and net heat flux between the two slabs during one oscillation period when T0 = 359 K, 331 K, and 341 K, respectively. e Measured net average heat flux between the two slabs with respect to ∆T when T0 = 340 K. f Thermal insulation by shuttling effect between the left slab of average temperature T0 = 340.4 K and the right slab at fixed temperature TR = 339.7 K when ∆T = 10 K.
