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how to model ACCU (Air Cooled Condensing Unit) in openstudio

asked 2017-12-21 14:14:06 -0500

dalin_si gravatar image

updated 2017-12-21 14:14:30 -0500

HI, maybe it is a stupid question, but what's the difference between AHU and ACCU, and how to I model a ACCU in openstudio? thanks!

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answered 2017-12-21 16:14:23 -0500

updated 2017-12-21 16:31:17 -0500

An air-handling unit in its most general definition is just a metal box that contains a fan, filters, a heating element, and a cooling element, and an outside air damper. It can be used with a variety of delivery systems, such as a variable air volume (VAV) system, a constant volume (CAV) sytem, or a dedicated outdoor air (DOAS) system. To get any more specific than that, you need to define what your source of heating and cooling is.

An air-cooled condensing unit is just describing the heat rejection method of a cooling source. Heat rejection methods include air-source, water-source, and ground-source. A DX cooling unit would have an air-cooled condensing unit, as would an air-source heat pump.

It's important to both define how you are delivering air, whether it is a multi-zone or single-zone system, and what the heating and cooling source is. In practice, AHU often indicates a multi-zone system (instead of a packaged single zone unit).

If you want to create a quick system that uses DX for cooling, you can click the plus sign the HVAC Systems section of OS and select a template system. There are several options with air-cooled DX or heat pumps.

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Asked: 2017-12-21 14:14:06 -0500

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Last updated: Dec 21 '17