THERMAL
STRATIFICATION
Heating delivery
Thermal stratification is a physical process in which a hot fluid naturally tends to position itself
higher than the cold one.
75° C
The fluid (water) is always moving, and tends to remixing, therefore the natural process of
stratification must be supported to maintain an increasing temperature gradient from bottom to
upper part and avoid the mixing of liquid at different temperatures.
70° C
60° C
75°C
55° C
Allowing stratification into the tanks means to create a remarkable difference in temperature
storaging volume from upper to lower part of. With important positive effects in terms of efficiency.
A proper stratificated storaging means to have quantities of hot water available in short time.
50° C
45° C
40° C
Standard Thermal
stratification
35° C
Example of stratification:
Heat received during the day is accumulated in the higher part of the tank, reaching a suitable
temperature for end user, while in the lower part temperature remain cold and even when solar
collectors have a temperature below the one needed (afternoon-evening), the heat exchanger
continues and tanks is storaging further energy.
THE
Efficient Thermal
stratification
65° C
30°C
30° C
25° C
20° C
TECHNICAL SOLUTIONS FOR THE OPTIMIZATION OF THERMAL STRATIFICATION
For a continuous improvement of efficiency and energy savings, Cordivari has developed innovative technical solutions for the optimization of thermal stratification
“LABYRINTH SPREADER” (CORDIVARI PATENT)
Performances are optimized thanks to the “Labyrinth Spreader” (Cordivari Patent) that thanks to its spread shape allows a perfect
stratification of the water that returns back from the plate exchange to the tank.
Heating installation efficiency is guaranteed.
Sequence of thermographic images that show how Labyrinth Spreader works.
EASY STRATIFICATION BUFFERS
The heating return stratification system (Cordivari patent), avoid any turbolences, that would effect thermal stratification inside the
buffer tank. Thanks to this optimized solution, efficiency and energy savings are continuosly improved.
Stratification plate
Heating return
stratificator system
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Sequence of thermographic images that show how a system works with the easy stratification Buffer
NEW BUFFER TANKS CTS®
The new range of Buffer Tanks CTS® are the last innovative and by Cordivari proposed storage tanks designed for
Solar Thermal Systems.
The exclusive Stratification device CTS® allow to have a prompt delivery of energy suitable for the production of hot
water.
The energy absorbed from Solar Collectors is efficiently stratified in the upper part of the tank through the stratification
device CTS® and separation plate already assembled in Buffer CTS®.
The thermal stratification inside the Buffer tanks will be then improved naturally, without any external valves thanks
to the mixed combination of:
1. Labyrinth Spreader that allows a perfect stratification of the water that returns back from user thanks to its spread
shape avoiding mixes of temperatures of storaged water
2. Upper thermal loading systems that concentrates in the upper part of the tank hot water produced by the lower solar
fixed coil in short time and high temperature.
3. Lower fixed Heat Exchanger designed for an optimal relation between space and efficiency.
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