Search results for query: *

Patricia, We are actually in the process of changing the supply system over to a newer cooling tower system that has bypass mixing capability so we can control inlet temperature where we want it. We actually use only about 600gpm total at 90F inlet temp. Usually about 2/3 in the first stage...

Hacksaw- CW supply temps cover a wide range (40 to 90F) as they are driven by ambient. Exit temps are nominally at a 50 to 70F delta. But I've seen exit excursions up as high as 175F and down to 90F during normal operations and almost regardless of inlet temp. There is no control on the water...

Tube dimensions: 4.5 foot long tubes with diameter 29/32". Thanks, Tim02

Whatever is causing this, 25362, I believe it must be flow related on the cooling water side. The fluidized sand has only one flow path available, entering down a chut at one end, through the heat exchanger shell horizontally across all 4 tube bundles in series, and out a chute a the other end...

Yes it is fluidized sand but... ... that doesn't make it a two-phase heat exchanger. It has 2 different fluids (the sand flows essentially as a fluid) but neither changes phase. Two-phase HX implies a phase change (i.e. a turbine exhaust condenser). Dooron, thanks for the reference. I think...

More System Details and Description The HX is has 4 cross flow tube bundles in a row separated into 2 parallel stages (a "hot end" stage and a "cold end" or process controlling stage. Each stage has its two tube bundles connected in series (1st bundle flows across and the...

Thanks Guys, Hacksaw, In manual we are closing the control valve to get more cooling which is intuitively backward but works. until we get back into a lower flow range and then starts working proportionally again. Patricia, it's never a dumb question unless you don't ask it and check it out...

Let me clarify some more. The hot side exit temperature starts to climb as the flow rate goes up. The cold side exit temperature (and delta T) goes down. The more the cold side control valve opens to increase flow in attempt to bring hot side (process control) temperature back down into...

In normal the operation of our cross flow heat exchanger the rate of heat transfer goes up proportionally to the cold side flow and we control exit temperature that way with a PID loop program operating the cold side throttle valve. But we seem to be able to reach a condition when the flow rate...