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Wondering if some folks in the northern climates can comment on which method you prefer for hot water preheat coil freeze protection. Thx.

the international fuel gas code has an appendix section that has an excellent example problem illustrating the correct way to size gas lines based on effective length of piping, inlet pressure and allowable pressure drop.

BronyrAur, I'm thinking you could come up with this by changing the outside air design conditions in a load program such as TRACE or HAP. Assuming there exists a load calc run with one of these programs or other equal, keep all your envelope criteria and internal loads the same, and simply...

Thanks Imok2, I will be sure to check that out.

Since the keyword search function is down, I couldn't find out if this is a repeat question, so I apologize if it is. My question: Are there any references, websites, energy modeling studies that you can point me to where an analysis of whether condensing boilers with low temp heat recovery...

anecdotally, you hear different versions of what route (conventional VAV supply temps, low VAV supply temp, UFAD) results in the lowest life cycle cost, but there must be some energy modeling studies done that have determined this for various climates and facility types. Not seen any yet though...

Try the Trane website. They have excellent free engineer's newsletters that provide application assistance with chiller system configurations (parallel, series, variable primary, primary-secondary). They also have more in-depth info for a very nominal fee, many are comprehensive design manuals...

Thanks absrbrtek and quark, I will try to get my paws on a few example control sequences.

Marcoh, don't forget another "con" in the form of decreased chiller efficiency if you are lowering your chws temp to achieve the colder discharge air temp. If you are staying with the same chws temp, your fan horsepower savings recognized from lower airflows will take a small offsetting hit from...

psychormetric analysis version 5.1.2.

Per quark's attached links, I have had personal experience with the handsdownsoftware psych chart, and it is very user friendly and you can easily plot all the typical air conditioning processes

Editorial Comment First: This is an awesome forum that I wish I came across long before today, and I'm looking forward to reading and contributing. Questions: What is/are some of the more reliable and trouble free control sequence(s)and system piping configuration for automatically switching...