GREENHOUSE Russian patent published in 2002 - IPC

FIELD: agriculture. SUBSTANCE: greenhouse has light-transmitting covering and aboveground heating system made in the form of hollow rods driven into ground. Rods are adapted for communicating underground zone with atmosphere. Lower ends of hollow rods are positioned in closed cavity formed in underground zone. One part of rods are communicated to atmosphere under covering and other part of rods are communicated to atmosphere beyond covering. Height of hollow rods under covering exceeds height of hollow rods beyond covering. Lower ends of rods communicating closed cavity with atmosphere under covering are shorter than ends of rods communicating closed cavity with atmosphere beyond covering. EFFECT: increased efficiency in utilizing subsurface heat. 3 cl, 1 dwg