Portable Air Conditioner Awning Window HVAC #3: Plans

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Blog entry by DevinT posted 03-28-2021 06:51 PM 400 reads 0 times favorited 0 comments Add to Favorites Watch
« Part 2: We have lift off Part 3 of Portable Air Conditioner Awning Window HVAC series Part 4: Privacy film, corbels, and the shelf »

Here are my designs for an HVAC system to redirect and vent the supply/return of a dual-hose portable air-conditioning unit through an awning window.

To better understand the concept, I have broken the plans down into 6 separate individual plans to explain each step that is taken to achieve the final concept.

(below 2 images) In step 1, nothing has been done to the awning window. First what the actual awning window looks like, and then the mock-up of that window in software.

(below image) In step 2, I show the window in 2 separate states. At left in the below photo is the same mock-up as shown in step 1 with all measurements stripped for clarity. At right in the same picture is the installation of corbels to support a shelf.

(below image) In step 3, we again have 2 separate states shown. At left is the previous state from step 2 with measurements added for the corbels. At right we see the introduction of the shelf which has a cleat that fits into a rabbet formed on the 2 outward-facing corbels.

(below image) In step 4, there are 3 states to consider, left-to-right. First is a replication of the last state from step 3 but rotated to the front-view with the shelf sitting atop the multi-corbel system. In the second state we see the bird’s-eye view of the shelf. Call-outs from state 1 pointing to state 2 identify the locations of the corbels which are obscured by the shelf in bird’s-eye (“top”) view. It is in this state that we introduce the supply/return duct cutouts in the shelf. In the last state on the far right, the side-view of the shelf atop the corbels with the awning window open.

(below image) In step 5, again there are 3 states. The first state introduces a new component which from the front appears as a plexiglass square, but in the last state (in side view) we can see that it is actually an angled hood that sits atop the shelf in a groove (see “Top View” state in the middle) that bridges against the frame of the window. This keeps the outside from coming in while we use the additional space for our supply/return.

(below image) Last but not least, in step 6, it is revealed that there will be a hinged door in the plexiglass angled hood that allows easy access for operating the push/pull-style awning window.

In the following blog chapters we will discuss engineering considerations, such as the R value for thermal insulation properties, how things are sealed, changes to the above designs that came in later for convenience and efficiency, and in-progress photos.

Not shown in the designs (since they were already getting long-in-the-tooth as they say) are the small additions that are done on top of the core design. Such as aged bronze vent covers and plexiglass toppers that go over the vents for redirecting airflow to keep supply separated from return and vice-versa. One person I showed these plans to asked how I planned to separate the supply/return, because it wasn’t obvious in the design that I planned to basically build an angled box with 3 sides and a bottom to just set on top of the return to redirect all the hot air away from the supply which will just passively pull from the hood. As long as I have the angles right on that smaller hood that I place over the return, no hot air should linger in the main hooded area above the shelf.

-- Devin, SF, CA

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