Regarding the air conditioning settings in the control room
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The last edit to this post was made by li*ch1968 on 2010-7-8 at 19:24. The codes for chemical industry heating and ventilation design require that control rooms be kept at a positive pressure level. Is this determined based on scale? What are the specific requirements regarding this positive pressure, or is it mandatory to have such a pressure level in all cases?
The codes for chemical industry heating and ventilation design require that control rooms be kept at positive pressure; therefore, they should all be maintained at positive pressure.
Oh, in the case of using a cabinet unit, it relies on the fresh air supply from the fresh air unit to maintain positive pressure
LS is correct; the fresh air volume is greater than the exhaust air volume
Is ventilation still needed? The fresh air needed by people can be met by the wind that penetrates in, right?
Reply to 5# jjw616: Positive pressure is achieved only when the air intake volume is greater than the exhaust volume. . Nowadays, positive pressure is required everywhere; even on trains it’s 30–50 Pa. The main concern is to prevent dust or other substances from getting in, such as unpleasant odors from the toilets. . . . .
This positive pressure air supply is quite troublesome; if the fresh air also needs to be treated, then I’ll have no choice but to use unit-mounted systems.
Regardless of size, all rooms equipped with air conditioning must be maintained at positive pressure.
I would like to correct the issue regarding positive pressure in air-conditioned spaces: the concept of positive pressure in such spaces is that the volume of air supplied must be greater than the volume of air exhausted in order to create positive pressure. Conversely, negative pressure is generated. Spaces that require positive pressure are generally: electrical and instrumentation control rooms, and spaces with high cleanliness requirements (medical rooms, operating rooms, pharmaceutical production, assembly of precision instruments, etc.). Places where negative pressure is required are generally those that generate toxic and harmful gases, as well as those that produce dust. Different functional areas have different pressure requirements, independent of scale! ! The control room requires a positive pressure to reduce the infiltration of outdoor air, minimize heat and cold losses, and prevent dust from affecting the equipment inside the control room. In the control rooms of chemical plants, even more attention should be paid to the issue of positive pressure in the space! ! ! To reduce corrosion and pollution.
Oh, for air supply as well, we need to consider cold and heat treatment. Are there any fresh air units that come with built-in cooling and heating functions?
For floor-standing air conditioners, a return air box can be installed at the return air inlet; this box is equipped with return air louver vents. Fresh air, after passing through primary and secondary filters, is delivered directly to the return air box via pipes, where it mixes with the return air. This combined air then undergoes cooling or heating treatment using the evaporator or electric heater inside the air conditioner. I’d like to offer my services – I have experience installing air conditioning systems in electrical rooms; I’ve worked on such projects for Handan Iron and Steel, Guodian, and Meihua Monosodium Glutamate. If you’re interested, feel free to get in touch with me. It’s okay if we don’t end up working together; at least we can become friends!