Affugtning og befugtning – optimalt klima på arkiv
When closing down the Hälsinge F15 airbase at Söderhamn in Sweden in 1998, the 188 hectares area was transformed into Flygstaden, a First Class Industrial Park (FCIP).
Today, approx. 40 different companies are operating from the former military buildings and among those we find the central archive for the Swedish Employment Service.
The archive keeps files and documents from Employment Service offices all over Sweden and is constantly expanding. 23 people are employed here to keep track of the more than 43,000 meters of shelves, to find and forward files to offices when needed.
Cooperation with Munters for years
Since its early beginning in Flygstaden, the archive has been using Munters desiccant dehumidifiers to control the climate in the archive. Subject to the regulations from the National Archives of Sweden, the archive has to maintain constant climate conditions around the year at 18°C (±2°C) and 30-40% RH (±5% RH).
Two Munters desiccant dehumidifiers, type MXT2100 and ML1350, have been operating next to the archive's AHU and humidification system to enable full climate control for preserving the documents.
Expansion required new equipment
When the archive expanded by 500 m² during 2012, the contractor Stefan Kring, Plåtteknik Söderhamn, contacted Munters to design the next dehumidification system.
As a result of the ongoing product development within Munters, a complete system for controlling both temperature and humidity, the ML Plus system, had been developed since the latest deliveries for the archive in Flygstaden 9 years ago. This system fitted perfectly for the archive as the outdoor climate conditions require both a dehumidifier and a humidifier to fullfil the above climate requirement.
ML Plus – a modern concept with numerous options
The ML Plus system is a modular system, designed and configurated exactly according to the specific customer need, with nominal airflows from 180-3,000 m³/h (operating airflow up to 5,500m³/h). The ML Plus system can combine dehumidification with humidification, pre- and post cooling and heating and offers a variety of filter options as well as different sources for regeneration (electricity, steam and gas).
The central part of the system is the ML dehumidifier that is known as a reliable and robust work horse, produced by Munters for more than 20 years.