| 摘要 |
In order to alleviate reduction in a heat exchange capability and to further improve the heat exchange capability, a heat exchanger of the present invention includes: a heat sink; and an electron emitting element which is provided so as to be separated from the heat sink by a space and which provides electrons to the heat sink via air in the space. The electron emitting element includes: an electrode substrate; a thin-film electrode; a power supply which applies a voltage between the electrode substrate and, the thin-film electrode; and an electron acceleration layer which accelerates electrons inside the electron acceleration layer in response to the voltage applied by the power supply so that the electrons are emitted from the thin-film electrode. The electron acceleration layer is made at least partially of an electric insulating material. The heat exchanger includes an air filter through which air flows onto a surface of the thin-film electrode. This can alleviate reduction in the heat exchange capability, caused by dust that adheres to a surface of the electron emitting element and therefore can attain an excellent heat exchange capability for long periods.
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