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If the equipment is totally contained and operating within the space then ultimately all the energy input may be lost as heat. As ChrisConley says, more detail on the typ of equipment is required. Cheers.

Hi Nathan, The following is a formula I've used to size a buffer vessel. This gives the total system requirement and sometimes can be used to demonstrate that a buffer vessel is not required (ie if the chiller, pipework and associated equipment already contain more than the calculated volume)...

The CIBSE guide table 6.6 in section A6 shows a peak load of 187 Watts (average 116W) per machine (including display screen. A laser printer is shown as 150 Watts peak (98Watts average). Cheers

Another option is to use modulating dampers within the extract duct rather than a VAV box. The dampers position is moved solely in relation to the room pressure. As above, the main extract volume would still be modulated by means of a frequency inverter in relation to static pressure. These...

They are also used on dust extract systems from powder filling rooms. Basically, anywhere where a potentially harmful product can be drawn into the extract system and would otherwise come into contact with the person carrying out the filter change.

dnmb Not sure specifically about switchgear but as I understand it, if a piece of equipment along with any associated motors is housed within a room you are tryin to condition, then eventually all the energy drawn by the motor will be converted to heat. Depending on motor efficiency, approx 15%...

Les As Yeldud says, psycrometric chart is easiest for this. However, if you're only interested in reducing temperature and not humidity (ie sensible cooling) then cooling duty is: Q = M x C x (t1 - t2) Q = Duty (kW) C = Specific Heat Capacity (approx 1.012 kJ/kg Kelvin) t1 = On coil...

I used a leakage through the stabiliser of around 0.15m3/s (300 cfm) to maintain a 15Pa pressure drop. You're right about the weight. The unit consists of a stainless steel or powder coated wall sleeve with a stainless steel blade. The blade has a circular adjustable weight in the centre. Have a...

SAK9 I used them some time ago on a clean room facility used for powder filling. The filling rooms (6no) were served by two common corridors (one on each side)and were under negative pressure with respect to the adjacent corridors. I basically sized the airflows based on door leakage from the...

Thanks for your help everybody. Electric humidifiers are used on the site at the moment (Carel HeaterSteam type) & I think thats the way the customer will go, but just wanted some back up advice before I discussed alternatives with him. Thanks.

Looking at a low grade clean room (ie less than Grade D, Class 100,000), for tablet forming. Air conditioning is only filtered to EU9. However, client has specified the use of Clean steam for humidification, generated from purified water supply. Bearing in mind that the rh required is only 37%...

CB Thats right. the units are usually preset at the factory although adjustment can be made on site. They are very effective where the customer doesn't want the expense of active pressure control, although they do result in larger supply / extract volumes being required. This is not usually too...

Its a good point regarding damaged doors messing up our carefully designed airflows. In clean rooms Pressure stabilisers are commonly used which are weighted stainless steel flaps mounted within the wall, often above the door. These are totally mechanical and will adjust to maintain the pressure...

Sorry, very late reply to this and i guess you may not need it now but.... According to York: V=N x 60 x Z / 4.18dt V= total system water content (Litres) N= chillers first capacity step (kW) Z= minimum allowable running time (min 5 mins) dt= temp difference at minimum partload condition (say...