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it's hard to say from distance, there could be different reasons for it. you can clear "lose casing" cause if you try to press casing firmly with few different powers exerted - taking care not to...

Such kind of repairs are tricky anyhow, while for smaller unit sizes it can hardly be worthy. the main issue is about how long repair will hold, similarly to repair of old car.

Some question arise...

I am not sure what are you considering plate heat exchanger, that is term used for water to water exchangers, while air heaters/coolers are mostly fin-and-tube exchangers.

On contrary to water to...

manufacturer has available and reachable data that presents maximum allowed length and provisions for elbows.
if you are within limits, rated cooling will be reached, but, of course, that does not...

i am not sure whether i can understand you. you are interesting to hear about some other duct materials where manufacturers have ambitions to have their products approved in some way? i cannot recall...

Can you be specific: what do you want to achieve and what problems do you have now?

i would say that you are comparing apples with onions which does not make sense.

eer is more or less obsolete figure, and the fact that some manufacturer does not declare seer says much about that...

to the best of my knowledge there is no any plastic duct material which is officially approved as adequate for supply ductwork.

there are few manufacturers which presented their investigation, and...

Is those duct runs quite long?

If your recirculating air cools down so much that it condenses on the inside, adding more insulation might be not only counter-condensation, but also counter-high...

What is usually of primary concern is temperature rating and proper data about fitting losses, many of those fittings have substantially higher dynamic losses than copper/steel, so that should be...

you certainly need guidance of journeyman as many stated, but if you want some readings for preparation, try to find books of leo meyer, can be found in some online secondhand shops like...

well, than you have good argument, but if client insists on larger size, it may be sufficient that you have an ordinary e-mail sent to client where you described what you wanted.

to some point i could understand your customer.

did legislation change in time between bidding and current time? if it did not, i see no purpose for asking customer to sign anything if you...

i can only guess that, as it is not intended at all that such valve works when de-energized, gas pressure is not sufficient to open it, but in any case it looks like main safety valve.

now that...

at least you know that you have to smash ceiling :eek:

installing refrigerant lines with joints through unapproachable area is one of the worst things i know where architects and dx systems sales...

you need soap to check joints one by one, finding refrigerant leaks is tedious task more often than not.

i'm far away from oregon, but i believe what you described is illegal anywhere in the world where there is any gas systems regulation in place.

not only that you must not bypass solenoid valve,...

1- this looks like free cooling at winter time, anyhow, outside temperature is not the same as indoor temperature, most of time, so you do need insulation as per previous post.

2- Similar to point...

pipes and units are generally covered by their manufacturers' quality certificates, and if we look strictly formally, in the moment you suspect they are exposed to mechanical damage, they are not...

relative humidity of air has nothing to do with expansion, but with thermodynamical property of air, where warmer air has more ability to hold water vapor.

i think many people spend too much time...

the most important thing is to take all assumptions into account.

if we assume that your fan is already selected and installed/ordered, and you want to vary ductwork, firstly you need to be aware...

yes, for open loop most of the previously mentioned comments apply as well.

pressure drop over line gives you data about flow, while measuring temperature can possible give useful information as...

ductwork that carries air with state equal or very similar to design indoor air conditions is not insulated as there is no purpose to have insulation.

there is number of occasions where carried...

in mini-split systems and many multisplit systems you have no any other joints but flare joints, and in such a case you can omit pressure testing as pressure tests serve to test joints, not pipes.
...

cooling towers are quite massive by default, if your plant have space issues, calculations should be done well in advance.

other than that, as someone mentioned, return on investment should be...