Koolance RP-452×2 (Rev2.0) Dual D5 Pump Dual Bay Reservoir Combo

First let’s look at the single pump performance.  For this we test the performance of one reservoir portion connected to the single pump only.  For a two loop setup with independent reservoirs, performance of each will be extremely close as the design is almost a perfect copy.

Performance testing is done by measuring the differential pressure gain across the pump and varying the effective load (loop) restriction by varying a faucet (tap).  For how to read pressure/flow plots – check out our guide.  For testing we use a D5 strong – this is the 24V capable version of the D5 that can acheive higher pressures than the standard D5.  We test at two points – 24V of course, but also 12V which equates to a D5 vario at about a setting of 3.5.  I.E. we test maximum performance possible, and a “silent” performance point.

First let’s look at maximum performance.  Here we compare to other D5 pump top and reservoir combinations.  Some of these are dual bay reservoirs like the XSPC or Monsoon, while others are cylinder setups.

For a basic interpretation we identify that most users seek to be between 0.5 and 1.5GPM of flow and want to know the pressure in this ‘zone’.  We can see that the Koolance RP452x2 R2 is in the middle of the pack.  This is good for a dual bay reservoir where performance can often be compromized by the package.  Of course what we really want to know is how much does flow change when considering the competition.  To do this we must plot a “load line” based on the restriction of a loop.  As every loop is different, we have created three load lines to represent low, medium and high restriction loops.  The flow rate of each loop will be the intersect between the colored pump lines and the grey load lines:

We can now see that even though the difference in performance between the entire competition is about 1PSI, the resultant effect on loop flow is only about 0.2GPM maximum.

If we lower the pump speed to a “silent” setting then of course pump pressure drops:
Alongside this so does the pressure change between the competition as this similarly scales down.  This affects the loop flow again only a relatively small amount:

Now let’s take a look at the performance with two pumps setup in series.