GREENHOUSE TEMPERATURE CONTROLLER Russian patent published in 1995 - IPC

FIELD: agriculture. SUBSTANCE: controller has cylinder filled with working fluid, rod kinematically hinge-coupled with fanlight and additionally loaded by compression spring, and also cup-type seals. Introduced into device are radiator, two longitudinal sections differing in thermal conductivity and reflecting capacity. Cylinder space is filled with grains of material featuring high thermal expansion coefficient. At temperature rise rod moves out and opens fanlight. At drop of temperature rod closes fanlight. EFFECT: enhanced efficiency of ventilation of greenhouses, reduced thermal lag of controller. 2 cl, 4 dwg