heat exchange ( synonym found)
Definition of heat exchange:

(n) : an act of exchanging or trading; a place for conducting trading
"all in all, it was an even exchange."
(v) : to trade or barter; to replace with a similar item
"I'll glady exchange my place for yours."
Definition of heat exchange:

(n) : an act of exchanging or trading; a place for conducting trading
"all in all, it was an even exchange."
(v) : to trade or barter; to replace with a similar item
"I'll glady exchange my place for yours."
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