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there can be a lot of reasons for this.. if it is like this on all seasons(if it would be from outside I'd expect this on summer on north hemisphere), than it is from the humans. what is the room temperature setpoint and what temperature does the RTU's blow in? maybe you are blowing in too cold...

fellow engineers, I've got a problem about duct leakage testing. we are testing ducts in our commercial building site according to DW-144. the test device is this ( http://www.tetisantesisat.com/measure-and-control-instruments/test-equipments/duct-leakage-test-device-en ). A standart test fan...

Thank you for the help. much appreciated.

Thank you for your replies. let me widen the question a bit. we have a fire alarm and detection system in the building. if it detects fire in any floor either from detectors or manual call points the AHU's stop and fire dampers on the related floors close to seal the floor. cdafd; I've read...

I've never hear that we need pressure vessels for fire fighting system. why would you put that there? to reduce the start-up time of the jockey pump? if this is the case you are using it with the same principle of booster sets so it should be about "1,2 x pump start-up pressure" so that it would...

both of them are acceptable but do not use CO2 if you don't have a perfect maintenance team. It is toxic and can really suffocate people. I have CO2 installed in my building just to save a little money on the installation budget but now I cannot operate it as if something goes wrong, I could...

If this is a 6 story building, I'm guessing that the pressure on basement is below 10 bars so the pipes and the other items should hold on churn+normal times. what I've done before is put orifice plates on the outlets that reduces the pressure on the hose to 6-7 bars so i haven't used any...

Hello, I've searched several threads and NFPA 90A but couldn't find an exact answer for my problem. I've 14 stories building with detectors and sprinklers inside the floors. I've fresh air supply units bigger than 20000 CFM each which serves around 2000 people. there has been a concern that if...

Anything? nothing?

Hello, I've got a specific question and looking for a possible confirmation from NFPA. I have a design concept in hand; - we have a lot of generators in the project. to reduce them we have come up with an idea to use the generators for business continuity and in case of fire these generators...

Hello, I need to check the quality of the activated carbon filter in my project. It's been working for three years now and as far as I know their working life is normally 1-1.5 years. I need to check the free chlor, colour and organic substances in the water. is there a test kit for these? I...

thank you for your answers. I'm still waiting a decision from the management but these would help a lot.

thank you for your answer, do you think that by saying "Equipment is installed in a 2-hour fire-rated enclosure including protection for penetrations", are they talking about the panels or the room itself. the room is fairly large(more than 300 m3)and only have electrical equipment. if I don't...

Dear all, I've found similar questions but not the exact answer. I have 3 electrical rooms with only circuit breakers, UPS and panels inside. According to NFPA 13@s below statement, I don't need to put any sprinkler or protection system inside. Now my question is for the third item. Is that...