Search results for "Radiant heat"
showing 3 items of 3 documents
Non-dimensional groups for air solar collectors
2003
Abstract The radiant heat captured by a passive air solar collector during a day divides itself into three fractions, of which one is transmitted by conduction to the backside, one is collected by the convective air flow, and the last one is lost through glazing. Some calculations of heat transfer taking place in a collector in 24-h periodic regime have been done with different combinations of the values of the relevant thermo-physical variables. Calculation results were the fractions of energy transmitted to the internal room through the wall by conduction and with the air flow by convection, and lost through the glazing. The results give rise to a correlation among non-dimensional variabl…
Two relaxation times and thermal nonlinear waves along wires with lateral heat exchange
2021
Abstract We propose a model for studying several nonlinear waves for heat transport along a cylindrical system with lateral non-linear heat transfer to the environment. We consider relaxational equations, each with its own relaxation time, for longitudinal heat transfer and for lateral heat transfer across the wall. We consider two kinds of nonlinear lateral heat transport: radiative heat transport, and flux-limited heat transport. This work generalizes our previous studies in which the relaxation time for the lateral heat transfer was considered equal to that of the longitudinal heat flux. We explore the influence of both relaxation times on the propagation speed of linear and nonlinear wa…
In situ and lidar observations of tropopause subvisible cirrus clouds during TC4
2010
[1] During the Tropical Composition, Clouds, and Climate Coupling (TC4) experiment in July–August 2007, the NASA WB-57F and ER-2 aircraft made coordinated flights through a tropopause subvisible cirrus (SVC) layer off the Pacific Coast of Central America. The ER-2 aircraft was equipped with a remote sensing payload that included the cloud physics lidar (CPL). The WB-57F payload included cloud microphysical and trace gas measurements, and the aircraft made four vertical profiles through the SVC layer shortly after the ER-2 flew over. The in situ and remotely sensed data are used to quantify the meteorological and microphysical properties of the SVC layer, and these data are compared to the l…