PROBLEM TO BE SOLVED: To provide a positive pressure heat exchanger in a plant cultivation facility that can heat the interior of the plant cultivation facility in a shorter period of time and a less amount of fuel than prior art, and can efficiently control the temperature.SOLUTION: The positive pressure heat exchanger in a plant cultivation facility for introducing warm air into the plant cultivation facility includes: an inner chamber disposed in the plant cultivation facility, connected, through a connection pipe, to a fuel combustion heater for heating the interior of the plant cultivation facility, and connected with an exhaust pipe for discharging the exhaust of the heater； and a box body enclosing the inner chamber, and having an intake opening for taking in air from the outside of the plant cultivation facility and a discharge opening for discharging the air taken in into the plant cultivation facility, the air being heated by being brought into contact with a heated surface of the inner chamber.【課題】本発明は、従来よりも少ない燃料で短時間で栽培施設内を暖めることができ、効率よく温度管理をすることができる植物栽培施設内陽圧型熱交換機を提供する。【解決手段】本発明は、植物栽培施設内に暖かい空気を取り入れる植物栽培施設内陽圧型熱交換機であって、植物栽培施設内に設置され、植物栽培施設内を暖める燃料燃焼式の暖房機と接続管を介して接続され、暖房機からの排気を植物栽培施設外に排出する排気管を接続した内室と、内室を囲み、植物栽培施設外から空気を取り入れる吸気口と取り入れた空気を内室の表面熱に接触させ暖めた後に、植物栽培施設内に吐出する吐出口を備えた箱体とからなることを特徴とする植物栽培施設内陽圧型熱交換機の構成とした。【選択図】 図１４
