| 摘要 |
<p>A heat exchanger and a method for displaying an exchange time point for heat exchanger units are provided to precisely determine a time point for exchanging heat exchange units according to operation efficiency of the heat exchanger and inform users of the same. A method for displaying an exchange time point for heat exchanger units includes the steps of operating initial efficiency of a heat exchanger at an initial operation time thereof, operating current efficiency of the heat exchanger whenever operating the same after the initial operation(36), and guiding exchange of heat exchanger units if a difference value between the initial efficiency and the current efficiency exceeds a reference value(48,50,52).</p> |
