Special feature
Any plant failure would put undue stress on the timbers. It was essential any
solution could not be compromised
“Access, limited space, size constraints and 24/7 reliability were key considerations,” com- ments Professor Mark Jones, head of collections at the Trust. “The museum cannot be disrupted. We required a robust solution that could offer N+1 redundancy, facilitated ease of maintenance as well as Part L compliance.” “Any plant failure would be detrimental and put undue stress on the timbers. We adopted a ‘what-if’ approach with Eaton- Williams. It was essential any solu- tion could not be compromised.” “Fanwall’s unique technology, using small diameter fans in an array (six in each unit) instead of a single fan used by traditional air handlers, ensures that when a fan fails the others will compensate and if any of the other AHUs fail the remaining systems can oper- ate at a greater capacity to ensure that the preservation process continues uninterrupted.” The units were constructed at Eaton-Williams plant in Stoke-on- Trent and rigorously tested for air leakages and volume testing. The systems were then disman- tled and delivered to the site where they were constructed in the dry dock. The fragile nature of archaeological wood requires a stable climate. The hull is subject- ed to 54 per cent RH with a tem- perature of 19ºC. The Fanwall sys- tems will be used to provide a close controlled environment throughout the museum once the drying process is complete. The Eaton-Williams Fanwall systems used to facilitate the dry- ing process provided an initial drying duty of 8.33m3/s with an expected final duty of 7.5m3/s and a standby duty of 12.5m3/s. There are heating and cooling coils in three sections and even at peak duty only two out of three coils are required to meet the load There are also four LKP units
which provide the galleries with comfort cooling at 18-24°C with ambient RH, with duties ranging from 1.92m3/s in the east gallery, to 2.16m3/s in the west gallery. The three Vapac units installed in the ‘Hot Box’ provide ultra- close control humidification. These systems along with the Fanwall provide a conditioned environment with a design criteria of19°C+/- 0.75°C with 54 per cent RH +/- 4 per cent. All systems are tightly controlled by a sophisticat- ed demand-led building manage- ment system.
“The temperature and humidity will continue to be very carefully controlled using Fanwall and Vapac humidifiers, even when The Mary Rose is fully dried out, to ensure that all the artefacts are preserved in perpetuity,” says Professor Jones.
The Mary Rose: A work in progress
The Mary Rose was built between 1509 and 1511. She was one of the first ships able to fire a broadside, and was a favourite of King Henry VIII. The 17 years’ treatment to conserve the ship’s timbers by spraying with polyethylene glycol was completed in 2013. It will take a further three years for the ship to dry out.
The new museum building was conceived as a finely crafted, wooden jewellery box, clad in timber planks in response to both the structure of the original ship and HMS Victory. A balcony to the west offers a vantage point over the Royal Navy dockyard and its many 18th and 19th Century Grade 1 and 2 listed buildings.
The Mary Rose Museum is a time capsule through which visitors can take a unique journey through a slice of Tudor England. Journeying through the 1,700m² of gallery space across three floors, visitors can learn the history of Henry VIII’s favourite ship, experiencing her tragic sinking in 1545 (after 34 years of successful service) and the lives of the seamen and officers who served on the Mary Rose. Real artefacts combined with the exhibits enable the treasures to be placed in context within the ship.
Fanwall systems in the dry dock underneath the Mary Rose. Copyright Eaton-Williams Daily news update at
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