BMS reading for chiller
BMS reading for chiller
(OP)
hi,
does any experience this problem before :
On the BMS/BAS monitor screen, the chiller tonnage is X ton. but when i used the formulea
ton= (16*flow(l/s)*Delta T)/24, the value is often different ?
This is due to equipment calibration out. I yet to ask my BMS guy wat wrong ?
Is there a standard algorithm for chiller sequencing using the tonnage.
does any experience this problem before :
On the BMS/BAS monitor screen, the chiller tonnage is X ton. but when i used the formulea
ton= (16*flow(l/s)*Delta T)/24, the value is often different ?
This is due to equipment calibration out. I yet to ask my BMS guy wat wrong ?
Is there a standard algorithm for chiller sequencing using the tonnage.





RE: BMS reading for chiller
RE: BMS reading for chiller
1. The real chiller's capacity can vary depending on loading.
2. Try to use the following formula:
TR = Flow(l/s) x Evap.Range(deg C) x 4.187 x 0.2844
RE: BMS reading for chiller
just need to clarify something, what does Evap.range stand for ? evap refigerant temp ?
thanks.
RE: BMS reading for chiller
RE: BMS reading for chiller
RE: BMS reading for chiller
Capacity in Btu/hr = Flow in GPM x 500 x Delta T in °F
RE: BMS reading for chiller
Heat removed Q(kJ/sec) = m(kg/sec) x Cp(kJ/Kg0C)xdT(0C)
1 kg water occupies about 1 liter volume
so Q (kJ/sec) = flow(l/s) x 4.18(kJ/Kg0C)xdT(0C
1 Ton = 3.517kJ/sec
therefore Q(ton) = (flow(l/s) x 4.18(kJ/Kg0C)xdT(0C)/3.517
= (flow(l/s) x 4.18(kJ/Kg0C)xdT(0C)x0.2843
Regards,
RE: BMS reading for chiller
I am used to using Tons = GPM x 500 x (°F TD)
RE: BMS reading for chiller
RE: BMS reading for chiller
RE: BMS reading for chiller
The chiller is reading a completely different pair of sensors than your EMCS mounted sensors.