Varmeveksleren varmer luftstrømmen.

The heat exchanger warms the airflow.

Breakdown of Varmeveksleren varmer luftstrømmen.

• varme: to warm
• varmeveksleren: the heat exchanger
• luftstrømmen: the airflow

Questions & Answers about Varmeveksleren varmer luftstrømmen.

Why do both nouns end in -en?

Because -en is the usual definite singular ending for many common-gender nouns in Norwegian.

So:

• varmeveksler = a heat exchanger
• varmeveksleren = the heat exchanger

and

• luftstrøm = an airflow / air current
• luftstrømmen = the airflow / the air current

Unlike English, Norwegian often puts the definite article at the end of the noun instead of using a separate word like the.

Why isn’t there a separate word for the?

In this sentence, Norwegian uses the attached definite article.

So instead of:

• English: the heat exchanger
• Norwegian: varmeveksleren

And instead of:

• English: the airflow
• Norwegian: luftstrømmen

This is one of the most important basic patterns in Norwegian.
A separate article is used for the indefinite form:

• en varmeveksler = a heat exchanger
• en luftstrøm = an airflow

But for the definite form, the article is usually added to the noun:

• varmeveksleren
• luftstrømmen

Is varmer a verb here, and what tense is it?