Chiller working correctly?

[Joseph Wright]

I recently purchased a Kryos 1/6 hp chiller nib, set it up, plumbed it in( out -take in sump near tank discharge, discharge from chiller near return to tank, temp probe in between(not near oulet of chiller)). When the pinpoint temp control turns it on, and its been running a while, i’m thinking i should feel colder water coming out of the discharge from the chiller. I dont feel much of a difference. Also, the compressor is running and i have the pump supplying it turned down as to have enough dwell tim through the chiller. Oh, by the way its rated for 135g, and my system is approximately 120g. Any info would be greatly appreciated...

 

[hijinks7]

did you get it new or used?

 

[Joseph Wright]

Bought it privately on ebay, but it was new in the box, seals were on the inlet and outlet of the unit, cord rolled up neatly stock. Packed in the original foam and box. I’m 99.9% sure it was brand new(hard to fake no salt water and all)

 

[ca1ore]

A 1/6HP chiller isn't a particularly big unit, so depending upon the flow through the unit, it doesn't surprise me that you cannot 'feel' a temperature difference. The better measure of performance is whether the unit is properly sized for your system (based on heat removal more than water volume) and drops the overall tank temperature after having run for a while. Keep in mind that the flow rate through the unit does not affect the heat removal, unless it is so slow that the chamber freezes up. I would not be restricting the pump.

 

[Chuk]

Stick a cheapo manual thermometer on the outlet and near where the feed pump is to get the temp difference. A 1/6 hp unit is only something like 2500 btu/hr so I would expect something on the order of a 0.5 deg drop through the unit depending on your flow.
The quick equation is Q=MCpdT
Q=heat transfer (2500 btu/ hr)
m = mass flow I assumed 1000 gph
Cp = heat capacity (saltwater is ~0.95 btu/lb*degF)
dT= temp difference.
Plugging all that in I get
2500=(1000 gph*8.34 lbs/gal*1.025 sg)*0.95*dT
Solve that for dT you get ~0.3 degF

Someone can check my math I do screw up every once in a while

 

[Joseph Wright]

Stick a cheapo manual thermometer on the outlet and near where the feed pump is to get the temp difference. A 1/6 hp unit is only something like 2500 btu/hr so I would expect something on the order of a 0.5 deg drop through the unit depending on your flow.
The quick equation is Q=MCpdT
Q=heat transfer (2500 btu/ hr)
m = mass flow I assumed 1000 gph
Cp = heat capacity (saltwater is ~0.95 btu/lb*degF)
dT= temp difference.
Plugging all that in I get
2500=(1000 gph*8.34 lbs/gal*1.025 sg)*0.95*dT
Solve that for dT you get ~0.3 degF

Someone can check my math I do screw up every once in a while

Here is the info on the back of the chiller, it does mention a 15deg f pulldown. Going to try the calibration thermometer i have and see if the temp is lower.

 

[Jeepguy242]

you may have too much flow going thru it

inline chillers need slow flow so they have time to cool the water inside the chiller before letting it out into the tank...

 

[Joseph Wright]

you may have too much flow going thru it

inline chillers need slow flow so they have time to cool the water inside the chiller before letting it out into the tank...

500 gph mag drive pump turned half way down i figure 250- 300 gph.