Abstract: A chemical agent-spraying device is provided with a chemical agent tank and chemical agent-jetting parts that jet out a chemical agent supplied from the chemical agent tank. The chemical agent-jetting parts include a first chemical agent-jetting part that jets out the chemical agent onto the reverse surfaces of crop leaves as an area to which the chemical agent is to be jetted, and a second chemical agent-jetting part that jets out the chemical agent onto the obverse surfaces of crop leaves as an area to which the chemical agent is to be jetted.

Abstract: A spraying machine includes a machine body, a support frame, and a spraying portion. The support frame includes a horizontal frame having a length along a left-right direction, and a pair of vertical frames and each having a length along an up-down direction, and protruding downward from both ends of the horizontal frame. The spraying portion is supported by the support frame, and sprays a spraying material. The support frame is supported by the machine body to be rotatable around a rotation axis passing through a fulcrum portion provided on the horizontal frame and extending along a front-back direction, while maintaining a relative positional relationship between the pair of vertical frames and the horizontal frame.

Abstract: With a thermo-siphon type heat exchanger including a heating section of and a heat transfer pipe of a thermoelectric power generation unit, the thermoelectric power generator recovers a heat from a hot gas flowing through a flow path and generates electricity. To the thermo-siphon type heat exchanger, a storage tank that stores a heat medium is connected in a communication state; transferring of the heat medium from the thermo-siphon type heat exchanger to the storage tank, and returning of the heat medium from the storage tank to the thermo-siphon type heat exchanger can adjust the heat medium amount in the thermo-siphon type heat exchanger. At least a part of the storage tank is placed in the flow path so that the stored heat medium is heated, and the stored heat medium can be cooled with a cooler that is capable of turning a cooling function ON/OFF.