Local Heat-Flux Responses of a Greenhouse Envelope and CFD-Predicted Airflow Around a Vertical PV Windbreak

External wind can increase greenhouse heat loss by enhancing airflow over the covering surface. This study investigated the local thermal response of a greenhouse envelope and the airflow around an adjacent field-installed, rigid, non-porous vertical photovoltaic (PV) windbreak using winter heat-flux measurements and three-dimensional computational fluid dynamics (CFD). Field measurements showed a strongly position-dependent thermal response: during the selected nighttime intervals on 13 February, mean heat flux was −7.9 W/m2 at the reference location and ranged from −0.6 to −9.9 W/m2 at windbreak-influenced locations. CFD was used as an exploratory tool to identify airflow structures around the greenhouse–windbreak configuration under prescribed conditions. The simulations showed coexisting sheltered flow, recirculation, edge bypass, and upper-level acceleration. Under side inflow, the line-averaged velocity along the windbreak-facing sidewall decreased by 67.5%, while increasing wall height reduced upper-level velocity by approximately 95%. Additional simulations indicated that wall closure mainly limited bypass flow, whereas increased height displaced the upper high-velocity shear layer. These results show that wall continuity and height act as complementary design parameters. The findings identify wall continuity and height as factors to consider when assessing vertical PV structures for combined wind shielding and electricity generation beside greenhouses.