Heat exchanger

Abstract

A heat exchanger having a polyamine on at least part of a surface of the heat exchanger. The existence of polyamine on the surface of the heat exchanger allows the odor components to be temporality held by virtue of the action of polyamine, and the odor components are not released into an interior room or the like at once in conjunction with the evaporation of free water (such as condensed water). Thus, the release of odor components is made moderate, and changes in the concentration of odor components in the interior room are reduced, so that strong odors sensed by people are suppressed. A typical example of the polyamine is PEI, and a typical example of the heat exchanger is an evaporator used in a car air-conditioner.

1 . A heat exchanger having a polyamine on at least part of a surface of the heat exchanger. 
     
     
         2 . The heat exchanger as recited in  claim 1 , wherein the polyamine has a molecular weight of 300 to 70,000. 
     
     
         3 . The heat exchanger as recited in  claim 1 , wherein the polyamine has a distance of 2 to 4 Å between adjacent amino groups. 
     
     
         4 . The heat exchanger as recited in  claim 1 , wherein the polyamine includes a hydrated layer having a thickness of 20 to 90 nm. 
     
     
         5 . The heat exchanger as recited in  claim 1 , wherein the polyamine is a polymer having one or more types of functional groups selected from a carbonyl group, a carboxyl group, an imide group, a hydroxyl group, a nitrile group, a nitro group, a sulfide group, a sulfoxide group, a sulfone group, a thiol group, or an ester group. 
     
     
         6 . The heat exchanger as recited in  claim 1 , wherein the polyamine comprises at least polyethylenimine (PEI). 
     
     
         7 . The heat exchanger as recited in  claim 1 , wherein the heat exchanger is an evaporator.