Hi there, i'm looking for some help to calculate the COP of a chiller (low pressure chiller) based on the pressure of the refrigerant that i have inside the Evaporator and the Condsenser.
the problem is i'm getting a very high COP when i'm doing the calculation, please find below the procedure...
As per 2008 ASHRAE HANDBOOK CHAPTER 11, to determinate annual heat gain for a buried system the STEADY-STATE CALCULATIONS are appropriate.
can anybody tell me why in that formula it's not present the heat transfer by convention from the pipe to the chilled water? what they mean with this...
when discharge valve is open 100% =operating condition (discharge valve is not throttled neither inlet valve) pressure=1.3 bar => head=43.49 ft, but from the pump curve design head must be 60 ft and 425 l/s flow.
suction side valce is 2 meters away from the pump and it's placed on the side.
1. OEM
2.the problem always existed
3.what is suction side placement?
4. duty flow= 425 l/s operating flow= 430 l/s
duty head=60 ft operating head=43.49 ft
when throttiling the valve:
valve 100% open pressure=1.3 bar
valve 60% open pressure=1.5 bar...
i have done some research on internet and i found some articles telling that the best way to identify if it's a cavitation problem or air entertainment problem is by throttling the discharge valve, if the the noise from the pump disappear it means it's a cavitation problem, cause by closing the...
thank you all for your comments...
i understand now it's not 100% a cavitation problem.
i wanted to tell you that when i was rising the water level inside the basin, i noticed that by increasing the water level only 20 cm the water start coming out from the gauge valve ONLY in case there is...
i had to esclude those options because it won't be possibile to do them( very expensive).
the side stream filtration pump is connected to the same cooling tower basin and it's 1 meter under the condenser pump so it's axes is 2 meters under the water level of the basin.
thx again
i forgot to mention that it's a centrifugal pump and please find below the pictures of the impellers, the one that we repair every year and the other one that is getting dameged more every year.
http://files.engineering.com/getfile.aspx?folder=d3c0d2c0-efc1-43a7-9b9d-e10e1e4c12dc&file=pump1.jpg...
I have 5 condenser pumps where each one of them is connected to a cooling tower, the discharge of the pumps are connected to a main header and then to individual chillers.
I have removed the pressure gauge before the pump and i noticed that the pump is sucking air if we open the valve instead of...
