Callidus Design offer the following design services. Please contact us if you have a service which is not listed.

Callidus Design Services

Humidity Control


The Science of Psychrometrics

Outwith ventilation systems for comfort only, some processes rely on environments in which the close control of both temperature and humidity levels are very important. It would be unusual for a building not to require fresh air ventilation and therefore the admission of external air into the building will alter the internal environmental conditions if left uncontrolled. The external ambient humidity level rises and falls hourly, diurnally and seasonally. Typically the external ambient humidity level is low in winter and high in summer. Therefore, in winter, moisture must be added to the air in the building and in summer it must be removed to compensate for the external changes. The addition of moisture is achieved through a process of humidification and the removal of moisture through a process of dehumidification. The science of moisture addition and removal is called Psychrometrics.


Clean Processing Environments

A wide range of manufacturing processes and scientific research facilities require environments where a low level of contamination or pollutants are present, which could otherwise adversely affect the product or research process. These environments are known as cleanrooms, where contamination or pollutants are controlled to a specified “cleanliness” classification standard. The cleanroom classification standards for the UK are laid down in the European Standard BS EN ISO 14644-1 which dictates the requirement for specific particle count measurements and calculations to classify the cleanliness level of a cleanroom or clean area. The classifications range from ISO Class 1 (highest classification) to ISO Class 9 (lowest classification), which specify the number of particles (usually specified at a particle size of 0.1 µm or 0,5 µm) permitted per cubic metre of air.

 acousticsNoise and Vibration Control

The design of all building services requires that any noise sources inherent within the design do not produce excess noise or vibration which may interfere with the intended use of the building or create unacceptable levels of disturbance to the occupants.

The initial selection of plant must be appropriate for the intended building usage and meet any maximum noise limitations stipulated by the client. This would typically apply to the selection of plant which is designed to move air or water through a building, i.e. fans, pumps and their associated distribution systems. For air distribution systems, the selection of ductwork, grilles, diffusers and dampers should be appropriate to maintain noise transmission and generation to acceptable levels. Similarly, for all pipework systems, the selection of pipework, valves and other inline components should be appropriate to maintain noise transmission and generation to acceptable levels.



Troubleshooting Services

Not all building or process services operate in the way we would like them to operate. This can be because the preferred mode of operation has changed since the building or system was constructed. It can also be as a result of a flaw in the original design concept or design briefing which results in the system being controlled in a manner which is less than desirable. In a commercial building this may prove to be a great annoyance for the building occupants but in a process environment it can be potentially disastrous or at least very costly. This is where the unique skill of Troubleshooting can assist in the resolution of this problem.