In which heat rejection system is the condenser located outside of the CRAC unit?

Question

Options

• AWater cooled system
• BGlycol cooled system
• CAir cooled DX system
• DAir cooled self-contained system

• A
  9% (3)
• B
  15% (5)
• C
  74% (25)
• D
  3% (1)

Explanation

In an air-cooled DX (Direct Expansion) system, the refrigerant circuit is split between two separate units: the CRAC unit houses the evaporator and expansion components indoors, while the condenser sits in a separate outdoor unit - making it the only option where the condenser is physically outside the CRAC unit itself. In a water-cooled system (A), the condenser is inside the CRAC unit and uses chilled water piped to it to carry heat away, so the condenser never leaves the cabinet. In a glycol-cooled system (B), the condenser is similarly housed inside the CRAC unit, with a glycol loop circulating to an outdoor fluid cooler - the fluid cooler rejects the heat, not the condenser itself. In an air-cooled self-contained system (D), all components including the condenser are packaged within a single cabinet, which is exactly what "self-contained" means.

Memory tip: Air-cooled DX is a split system - "split" tells you the condenser and the CRAC unit are in two separate locations. If you see "self-contained," everything stays in one box, and if you see "water" or "glycol," a fluid does the traveling instead of the condenser.

No community discussion yet for this question.