Trocador de calor para sistema de aquecimento
A trim cooler is a water-cooled heat exchanger which is used in addition to an air-cooled heat exchanger.
When ambient air temperatures cannot cool the process liquid to the temperature desired, a combination of air-cooled and water-cooled trim cooler can be used.
When a lower process outlet temperature is required, a water-cooled trim cooler is installed in series with an air-cooled heat exchanger.
A trim cooler is a water-cooled heat exchanger which is used in addition to an air-cooled heat exchanger.

https://www.collinsdictionary.com/pt/dictionary/english/trim...

TROCADOR DE CALOR: OQUE É, COMO FUNCIONA E QUAIS AS VANTAGENS
NOTICIAS DO MUNDO DAS PISCINAS, TENDÊNCIAS E NOVIDADES

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Note added at 29 mins (2022-03-03 12:24:53 GMT)
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https://propeq.com/trocadores-de-calor/
Reference:
https://www.collinsdictionary.com/pt/dictionary/english/trim...

https://www.marol.com.br/blog/trocador-de-calor-oque-e-como-...

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Note added at 44 mins (2022-03-03 12:39:56 GMT)
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A "trim cooler" is a type of auxiliary cooler that makes up a part of a process. Trim Coolers are typically designed to work only part of the time and the coolant could be either cooling water or air.

But "Air Cooler" is a process equipment which is continously in service and use air as coolant.

https://specialties.bayt.com/en/specialties/q/29302/what-is-...

DIMENSIONAMENTO DE UM TROCADOR DE CALOR
AUXILIAR PARA UM VEÍCULO MODELO SAVEIRO DIESEL

https://www.fahor.com.br/publicacoes/TFC/EngMec/2014/Marcio_...

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Note added at 51 mins (2022-03-03 12:47:18 GMT)
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Trocador de calor como sistema de aquecimento auxiliar
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https://wgsol.com.br/sistemas-de-aquecimento-auxiliar-para-o...