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In my opinion, yes, it's the professional thing to do. You may have to work with some of those contractors on other projects and a courtesy note saying that you thank them for their effort, but weren't successful, to be sent out as soon as possible after you've selected your contractor buys a...

As Drazen said plus look at whether you are exhausting point source equipment and "source of heat" exhausts to get the total actual "cooling" load that needs to be applied for worker comfort.

For food processing plants you may find that the amount of point source exhaust and process equipment exhaust will define the amount of fresh air/make-up air required. Consider a heat recovery system if you are in a cold climate. There will also be refrigerant detection and alarming...

"Codes" are a Minimum Safety Standard - there is a lot that is not in any "Code" that the design engineer has to actually do some real design to accomplish a successful building HVAC system. The "Codes" are not supposed to be a design guide/checklist - the Code is the minimum bottom line that...

What BronYrAur said- from what you are asking, it seems like you are trying to rationalize the use of the heat and cool source, and then try to make the radiant system work based on your sources of heating and cooling. I've been designing and operating radiant systems (slabs, panels, floors and...

Client just saved a bagful of money (he thinks) buying cheap direct fired MUA's. Now the reality of Code Compliance will require spending probably triple what the Client saved, on interlocks and new controls, plus your time in proving to the AHJ that the localized direct fired air quantity is...

Or you could just drain down the entire system and re-fill it with a known, mixed 30% propylene glycol mixture till it's full again. Or just keep adding and draining off fluid till testing indicates a 30% mix. Or do some real engineering and do a proper estimate and calculation to start, in...

I'm not sure why an Owner/developer can dictate to a professional engineer what system to use, but if you are OK with the potential risks and possible benefits, then fine. I have found that VRF systems tend to be a system where the installer/supplier can then work it into a nice service...

It sounds a little like you are trying to pound a square peg in a round hole. VRF systems and residential occupancies are risky at best, and I would suggest that a well designed and operated conventional four-pipe fan-coil system would work just as well, on a budget, and have a lot less risk...

Good practice is to use less than 2 meters or less than 6 feet. The issue is the high air friction as well as supporting the flex duct to prevent kinks and sharp bends.

There are also local PE and P.Eng. Association requirements for "good practice" (that will hold up in court) - for example - in British Columbia, APEGBC REQUIRES the engineer of record to make site reviews at his discretion, or if the site reviews are delegated, it must be at the EOR's direct...

There was similar information discussed and referenced in this discussion: http://www.eng-tips.com/viewthread.cfm?qid=408480

It sounds like you have water to air type heat pump units? In that case, yes, you'll likely have to add heat to the condenser (source) water loop if that is falling too low as the heat pumps are extracting heat. I don't think the fact that the condenser water can sit in the loop without...

What Drazen said. Here in Canada there are a number of early adopters' efforts that resulted in permafrost being formed due to value engineering the ground loops and just plain poor ground loop/borehole designs. There is also a way to recharge the ground using solar thermal panels depending on...

Umm EnergyProfessional- I interpreted his post to mean he had 6 chilled beams at 60cfm each of primary air which makes sense. However, I still view ASHRAE 62.1 as a "minimum standard", and up here in my world we commonly use a minimum of 400 cfm per classroom in elementary schools, and up to...

RandomUserName - you need to send a bill for your engineering services now... But yes, I agree - a school is primarily ventilation driven and the ventilation air supply will probably be able to do all the heating and cooling of the classrooms with just the 100% ventilation air supply alone, if...

Depending on your climate zone, which you didn't mention, I assume it's a moderate climate with humid spring, summer and fall conditions? Then yes, the DOA isn't configured properly at all. Typically I'd suggest the dessicant energy wheel as air on first, then the cooling coil, then the reheat...

Orator, hopefully you've Googled some information off the 'net like these excellent bits here: https://www.trane.com/content/dam/Trane/Commercial/global/products-systems/education-training/engineers-newsletters/standards-codes/admapn017en_1005.pdf...

I would be fascinated to see how one can add humidity to a 100% RH saturated airflow. Perhaps some great new high technology...