Heat exchange system
Heat exchange system means any cooling tower system or once-through cooling water system (e.g., river or pond water). A heat exchange system can include more than one heat exchanger and can include an entire recirculating or once-through cooling system.
Source
40 CFR § 63.1082
Scoping language
Unless defined in paragraph (b) of this section, definitions for terms used in this subpart are provided in the Clean Air Act, 63.1103(e), and 40 CFR 61.341.