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|1. (WO2017150353) HEAT EXCHANGER|
Provided is a heat exchanger configured such that heat is exchanged between air having a specified humidity and a fluid having a temperature lower than the air, and comprises a heat-transferring part (20) disposed so as to contact at least the air. The heat-transferring part has at least a first layer (21) and a second layer (22) positioned between the first layer and the air. The second layer is formed from multiple molecules that are hydrophilic or lypophilic and comprises phosphonic acid at a first terminal of the multiple molecules facing the first layer. The oxygen in the phosphonic acid has a chemical bond that is covalent with the first layer. Frost growth can be sufficiently controlled with this heat exchanger.