I am commissioning a dual fuel natural gas/oil hydronic boiler by Bryan Boilers. Input MBH is 1200/600 and output is 1002 MBH. Boiler MAWP is 160 psig.
I have attached a photo of PRV installed on top of boiler. Intuitively, a reduction in size from 2" to 3/4" orifice represents a significant...
Good morning,
If I am interested in overall energy consumption from the heating boilers in a building, is it more advantageous to locate the energy meter in the hot water supply line or the hot water return line?
Simple question but maybe not a simple answer!
Tom
Good morning, I hope everyone is staying safe during Covid precautions.
To provide some background, my installation is in a school in Edmonton, Alberta, Canada. A Daikin RCS045D condensing unit with 4 compressors provides cooling and hot gas bypass if required. The condensing unit is internally...
Hello,
I have recently completed startup on several large air handlers. Each air handler has a service corridor maintaining room temperature.
There are four transformers in each corridor and they all have surface temperatures of 150F.
I expect high temperatures on transformers, but is this too...
We have tried to shorten the construction time of a 6 storey hospital building. There are 1626 supply, return and exhaust boxes controlled by a Honeywell ComfortPoint system. In the majority of areas, there are 1 or 2 ceiling diffusers for each VAV box. During construction, we blanked off duct...
This is a new problem for me.
I am commissioning a hospital with 5 Trane series RTHD chillers. Unfortunately, the machine room is located in the basement and in the center of the building footprint.
The chiller pressure relief valves (3 per chiller) are piped and sized correctly into a common...
I always understood that counter flow positioning of temperatures was optimal for heat exchange.
With this in mind, it seems to be intuitive that the return air in a rooftop package would first come in contact with the colder coil face. That is to say the side of the coil face where the...
I have two new low pressure steam (steam pressure set to 8 psig) boilers operating in parallel. These boiler have independent piping leading to separate pressure reducing valves. The valves are set to system pressure of 5 psig. Downstream of the PRV's is a steam header and off the header the...
We were 10 days into a 14 day flush prior to occupancy.
I discovered the breakers to the outdoor air source had been inadvertently turned off for an inspection of the fire alarm relay and not turned back on. Breakers were off for 3 days before anyone noticed.
Is the flush requirement...
I am conducting several tests for a 40,000 sq.ft medical facility with a raised floor.
While I was not on site every day, I did observe all trades take particular care with sealing all below floor cavities with sealant, including electrical conduit which passes through the floor.
I do expect...
I would have thought this would be an easy issue to resolve but I may need a re-focus.
I have commissioned 40 Daikin VRV (variable refrigerant flow) fan coils on two floors with the requisite condensing appliances. The system is working like a charm. There are no vibration issues at this time...
Through many years of visiting different plants I have noticed that sometimes the hot water is pumped away from the boiler. Somtimes the water is pumped into the boiler.
Which system is correct and why??
thanks, Tom
Good morning new to this forum and I have an interesting question from British Columbia, Canada.
As a boiler mechanic, I have always thought of boiler rooms as a dangerous place and that people outside need protection from equipment mishap inside.
I also am reminded daily of the jurisdictional...
Good morning all,
On my last project I tried to verify and calculate the Btu energy and compare this to 5 Badger 380HS energy meters installed in a solar and heat pump loop. Nothing is perfect in the field and of course, meter installtion is no exception. There were a number of factors to...
I am soon to be commissioning a mechanical system using 3 water source heat pumps to heat and cool a medium-sized passenger ferry building. Does anyone have a good source to read up on applcable BAS control schemes for hot vs.cold days?
thx,tab
We are commencing a project to reclaim heat from various areas in a hospital. Airflows on the supply and exhaust side range from 20,000 cfm to 50,000 cfm.
We have a glycol-filled heat extraction coil in the exhaust stream connected to a heat recovery coil in the supply airstream.
I can easily...
Is there a good way to calculate the lowest possible temperature for loop heating while maintaining enough heat to prevent appliance lock-out...or is trial and error the best method?
Would the same formula work for cooling mode?
thanks, Tom
Hello all;
I have before me an interesting problem.
We are sinking a PVC frame approx 10 feet Wide by 30 Length x 4 feet High. No problem to place it floating in the ocean. The frame will fill with saltwater once there. The frame will hold 9 coils of 2" HDPE approx 200 feet per coil...
Hello All,
Are there any signifcant differences for water treatment between conventional boilers and the new condensing boilers with either stainless or aluminum heat exchangers?
We are particularly concerned about retrofit situations with years of accumularted debris. After removing debris, do...
Hello everyone,
I am trying to get a better knowledge of flame characteristics for various soild, liquid and gaseous fuels, including hog. Does anyone know a good source (s)?
thanks in advance,
Tom
