Ventilation
Improving cleanroom efficiency
cleanroom environment is defined within ISO 14644-1:2015 as a room in which the concentration of airborne particles and other relevant parameters (i.e. temperature, humidity) are controlled as necessary. Modern cleanroom facilities are used
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ISO 14644-1:2015 separates cleanrooms into classes based on the size and number of particles within a cubic metre as indicated above
for a variety of purposes and the level of cleanliness will often depend on the room’s function. To support designers, ISO 14644-1:2015 separates cleanrooms into classes based on the size and number of particles within a cubic metre. The HVAC system is required to do much of the heavy lifting to ensure particulate rates and other parameters remain within set limits. High Efficiency Particular Air (HEPA) or Ultra-low Particulate Air (ULPA) filters are typically used to remove contaminates. In addition, these systems are operated
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The Kingspan KoolDuct System has been used to provide a lightweight and versatile solution for Zeus Juice UK’s ISO Class 8 Cleanroom
Cleanrooms are highly energy intensive facilities, using as much as 30-50 times the energy of a standard commercial building. HVAC systems often account for a significant proportion of this. To reduce their long-term operating costs and carbon footprint, it makes sense to look for more efficient building service options. The latest pre-insulated ductwork offers a fast-track alternative to conventional sheet metal and can allow air flow requirements to be met with lower energy fans
at extremely high air flow rates. CIBSE recommends a ventilation rate of 10-120 air changes per hour (ACH) for non- laminar-flow rooms and 500-600 ACH for laminar-flow rooms. This compares with just two or three ACH for a normal building. At these rates, it is essential that ductwork is carefully designed and installed to minimise air-leakage. Whilst this is possible to achieve with conventional sheet metal ductwork, the added detailing will often add considerably to the installation programme length and cost. Pre-insulated ductwork systems offer a simpler solution and are purpose designed to minimise air-leakage.
Benefits
Pre-insulated ductwork is typically formed from panels with an insulated core faced on
THINKING BIG: POWERFUL MVHR UNIT LAUNCHED
airflows of up to 178 l/s (640m3/h), making it the most powerful MVHR unit Titon has produced. The HRV20 HE Q Plus has been designed to
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enhance SAP performance via Appendix Q, by combining extremely low power consumption and a heat exchanger capable of achieving efficiencies of up to 92%. As a result, units can easily be fitted
34 November 2019
iton has added the energy efficient HRV20 HE Q Plus to its range of MVHR products. The new model has been designed to offer increased
as part of a ventilation system inside larger apartments or dwellings. The HRV20 HE Q Plus is available in two models
– the Eco HMB and the Eco B – each boasting a 100% airflow diverting Summer Bypass, as recognised in the UK Product Characteristics Database. Intelligent humidity options are also available. The Eco HMB is fitted with the new aura- tTM touch screen controller, which is integrated as part of the unit itself as standard.
Other benefits include a
low specific fan power (SFP) of 0.48 W/l/s, plus features such as a fully adjustable boost overrun timer, which can
be used with a non-latching (momentary) switch to prevent the unit from accidentally being left in ‘boost’ mode. This is complemented by intelligent frost protection and independent fan adjustment.
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