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Thanks all for replies! It's a cooling loop like in the picture below:

Thanks for reply. DP1 coil return temperature should be constant. So 3-way valve controls also the cooling power of the coil.

DP1 is cooling coil. DP2 is evaporator. 3-way is controlling cooling coil return temperature.

Hi. If I want to maintain constant flow at dp2, but pressure loss dp1 > dp2, what's the best way to control the pump?

Water analysis report says conductivity is actually <150 μS/cm and dissolved oxygen is <20 μg/kg. There's Hydrazine (200 μg/kg) in the water. pH is 9.5. But put Class 150 valve in.

CS valve is cheaper. There's a vacuum degasser in the system.

Hi. I'm wondering what's the possibility of galvanic corrosion when welding CS (1.0345 / A285) valve to SS (1.4307 / 304L) pipe with 309L filler metal? H2O conductivity is 30 mS/m (300 μS/cm), temperature 50° C (122 °F), pressure 3 bar (43.5 psi).

Yes, those equations by Rosenblad & Kullendorff and Heavner et al. are curve-fits through sparse empirical data. And they are old, indeed.

Hi. These questions are for those, who are familiar with Nusselt number correlations and PHE research history. Q1: Rosenblad and Kullendorff (1) had jD=0.273 x Re-0.303 for the correlation in their experiment. But Manglik (2) proposed Nu=0.289 x Re0.697 x Pr(1/3) for the correlation according...