Circuit setters for wshp

[Air flow man]

Question. Circuit setters on wshp are for (gpm) is their only pupose for economy. I realize maintaining flow rates are critical, and minium but proper rates are needed. This saves $ on the pump side of the system,but would max pipe flow effect pressures on the system.,adversally effect heat transfer with to much flow?? Thanks in advance for your in put.

[GT Jets]

Originally Posted by Air flow man

Question. Circuit setters on wshp are for (gpm) is their only pupose for economy. I realize maintaining flow rates are critical, and minium but proper rates are needed. This saves $ on the pump side of the system,but would max pipe flow effect pressures on the system.,adversally effect heat transfer with to much flow?? Thanks in advance for your in put.

Air flow man, this question is very loaded, but I am going to take a crack at it.

The circuit setters are there to obtain proper flows on a given system and give some adjust ability to obtain the design specs yes, but it goes further than that.

They allow the system to be "balanced", lets say there are 20 WSHP's and only one pump, if all 20 C.S's were at 100%, you would not have the proper pressure differential on any of the WSHP's and have a real mess on your hands..

Now that being said, if there is only one WSHP, then your pump would have to sized for the gnat's ass and you would have no adjust ability...

As far as problems running wit too much water flow, yes, many many problems. Low head pressure and potential ice ups in cooling and low heating performance in heating....(Heating would be effected less than cooling)...

GT Jets

[atmosphere]

The circuit setter works as a type of "hold back " device.

They make sure the fluid stays in the vessel upstream long enough to allow the designed amount of heat transfer to occur.

[flange]

very high flow through a copper coil can also cause erosion, leading to failure of the heat exchanger, compressor, and unit. too many shortcuts these days causes customers to view us as hacks. say no to hacking.

[PortaChill]

The purpose of the circuit setters on your wshp set up would be to regulate condenser water flow thru each unit to ensure proper heat transfer. Most setters are adjustable but I had a few Blds. in the past that had fixed orfice type which had become sediment traps(Tower and pumps were high point) on bottom floors of bld.

[Randy S.]

What Flange said. Double.

[Air flow man]

Ok guy's thanks alot. I was trying to ask a question with out being to leading. I'm sorry i didn't do a very good job of it. So here goes, GTJets stated that too much flow would cause low head presures and possible icing of evap coils. (Sounds logical sounds right). I was just wandering(incorrectly) if too much flow could raise head pressures by not enough contact time, i'm assuming volume makes up for it. I was just comparing it to when your blower speed is to high and you have poor dehumidifacation because of contact time with coil being poor. Could i be on to something or am i just way off base.

[Paul Bee]

Too much water flow will give you low head pressure along with low suction pressure/iced up evaporator. Imagine putting a higher horsepower condenser fan motor on an air cooled unit, what is gonna happen to the head pressure? And doing it right is critical, a lot of contractors will call in a TAB company to make sure it is done right. The other aspect is efficiency, a unit with not enough head pressure is not very efficient, low head pressures will reduce flow through metering devices, which have capacity ratings dependent on the pressure differences across them. This reduced flow causes a starved evaporator which will cause low suction pressures and high superheats. Water exchanges heat a lot faster than air. Contact time is not an issue. Take your hot bowl of oatmeal and try cooling it off by blowing on it, now set it in a sink of cool water, which works better? Correct temp split on a water source heat pump is around 10 degrees.