fassi
12-11-2006, 06:55 PM
Hi list
I may have a capacity problem with a PHE chiller. It is designed for 1050 KW operating on ammonia and gravity recirculation. The evaporating temperature is -10 C and secondary refrigerant is propylene glycol of 35% volume concentration, T-in is + 6 C and T-out is -2 C based on 120 m³/hour. The "riser" between the PHE and the separator is a 6" pipe and is 2,2 m high. The PHE has active heat transfer area of 50,16 m² and 116 plates in total.
For the time being the chiller only need to produce approximately 650 KW, but I cannot achieve T-out of -2C, I get instead + 7C and there in no way to lower this temperature, but I have no problem in maintaining the 8 C differential temperature. The glycol flow is approximate 80 m³/hour.
So I wonder if the 6 " riser is to big for 650 KW capacity and therefore accumulate a certain liquid column which cause a increasing the evaporating temperature.
Looking forward to hear your comments.
Fassi
I may have a capacity problem with a PHE chiller. It is designed for 1050 KW operating on ammonia and gravity recirculation. The evaporating temperature is -10 C and secondary refrigerant is propylene glycol of 35% volume concentration, T-in is + 6 C and T-out is -2 C based on 120 m³/hour. The "riser" between the PHE and the separator is a 6" pipe and is 2,2 m high. The PHE has active heat transfer area of 50,16 m² and 116 plates in total.
For the time being the chiller only need to produce approximately 650 KW, but I cannot achieve T-out of -2C, I get instead + 7C and there in no way to lower this temperature, but I have no problem in maintaining the 8 C differential temperature. The glycol flow is approximate 80 m³/hour.
So I wonder if the 6 " riser is to big for 650 KW capacity and therefore accumulate a certain liquid column which cause a increasing the evaporating temperature.
Looking forward to hear your comments.
Fassi