Zomeworks-Baer Double Play Container Shelter

David Harrison’s description of the Double Play Container Shelter system. Received via email from Bruce Davis on 2026-10-18 as a Word document attachment to David Harrison’s 2026-10-16 message. See provenance email.

Extracted from: Zomeworks - Baer Container Double Play Description.docx

The double play shelter is a modified 8’ x 20’ “high boy” cargo container. It’s a new container with an insulated and finished interior. It’s fitted with a Double Play passive heating and cooling system which both heats and cools the container. The system has 3 ea. south side wall mounted non glazed stainless steel selective surface hydronic solar absorber panels. The panels are plumbed to a rooftop water bladder in direct contact with the steel ceiling of the container. A wood framed rafter construction is attached on top of the container to the support bladder system. The ceiling is attached to the above roof structure with 3 steel tubes running the length of the shelter that are bolted into the roof rafters. The rafters carry the load of the water bladder system. A secondary metal roof is installed above the bladder and framing and is the radiator for the cooling system. The mass of the water bladder in contact with the ceiling, conditions the space below, heating and cooling as needed. There’s a heating mode, cooling mode, and neutral mode adjustable to the season. In cooling mode the bladder is full. The roof radiates heat to the night sky which cools the water and space below. In heating mode, the bladder water level is reduced to stop cooling. The south wall absorber plumbing valves are opened to allow warmed water to circulate up into the bladder for heating. In spring and fall neither heating nor cooling maybe needed. The thermal mass of the system keep the comfortable both day and night. The beauty of the system is its simplicity, reliability, and quiet operation.