Cold-Water-Circulation with KHS CoolFlow
Four succes factors that ensure flawless drinking water hygiene
Current obstacle: temperature - the planning hurdle
Inner heat loads
High heat loads in installation areas
Heat sources such as hot water pipes in plumbing and heating systems and components in electrical and ventilation systems lead to a rise in temperature of the cold water pipeline to more than 25°C in a stagnation phase of two hours, even if the insulation complies with standard DIN 1988-200.
External heat loads
High ambient air temperatures
High external air temperatures can cause ambient air temperatures of more than 25°C in buildings without air conditioning. In the event of stagnation, cold water temperatures below 25°C can no longer be achieved as a result.
Water inlet temperatures
Where drinking water is sourced near ground level in the summer months, the temperature of water fed into drinking water installations is higher (>20°C), reducing the maximum tolerable stagnation time even more.
Drinking water hygiene is an obligation of the operator
When stagnation occurs, the drinking water takes on the temperature of the environment. This can lead to a change in the drinking water quality that is harmful to health. A temperature rise to over 25°C is particularly alarming, as microorganisms such as Legionella multiply in lukewarm temperature ranges. Operators of public buildings have a particular obligation to ensure hygienically perfect drinking water throughout the entire drinking water installation at all times.
To avoid stagnation alone, the whole water content of the installation must be replaced within 7 days. If this cannot be guaranteed by normal use, stagnation flushing must be carried out. These measures are not sufficient, however, if the temperature of the cold water rises to over 25°C due to internal and external heat loads (see above). In this case, additional temperaturecontrolled flushing is necessary; this is not justifiable, however, in terms of economy and sustainability.
The solution: Cold-water-circulation with KHS CoolFlow
With KHS CoolFlow, cold water temperatures below 20 ° C can now be permanently achieved up to the point of use. The drinking water is distributed via KHS Venturi flow dividers to the tapping point. The KHS CoolFlow chilled water cooler cools and circulates the drinking water. The KHS CoolFlow cold water regulating valve regulates, rinses and shuts off circulation circuits if necessary.
Permanent cold drinking water up to every tap – only with KHS CoolFlow!
Sustainable and economical justifiable protection against high cold water temperatures is only possible by means of cold water circulation with active temperature control. In order to allow cold water cooling in conventional installation concepts, an additional pipework system has to be installed. With flow splitter installations, however, that is not necessary, as the piping system already installed to cover the water demand is suitable for cold water circulation and can also be used for this purpose. Existing flow splitter installation can therefore generally be retrofitted with KHS CoolFlow at little expense. By contract with conventional installations, drinking water installations with KHS enable temperature control in all parts of the pipework system right up to the connection of the tapping fittings. Temperatures of < 20°C can therefore be maintained even in buildings with high heat loads where thermal separation with horizontal distribution concepts is possible only to a limited extent.
The benefits
In all areas
- Permanent temperature control < 20°C at every tapping point
outlet, even with high heat loads
Use of innovative flow splitter technology:
- Minimised pipe inside surface area
- Low number of flushing devices
- Low maintenance costs
- Use of the pipework for the water demand
Payback
- With high heat loads, KHS CoolFlow achieves
payback period of less than 2 years compared with
temperature controlled using flushing
KHS CoolFlow cold water-regulating valve
Automatic circulation regulating valve with integrated flushing function
3 functions - 1 valve
- Regulating function: Thermal regulating function with a working range
from 15°C to 20°C ensures automatic hydraulic balancing
of the cold water circulation system - Flushing function: turbulent flow in all areas of the drinking water installation
- Shut-off function: electrical shut-off function for absolute control of the system
from one central points
100% planning certainty
One control range for all applications simplifies dimensioning and guarantees reliability at all stages of planning and operation
Easy to retrofit
Existing KHS systems can be retrofitted at little expense.
available from 1st quarter 2020
KHS CoolFlow cold water cooler
Continuous-flow drinking water cooler with integrated
circulation pump
Huge performance with minimum space requirement
With a space requirement of less than 0.5 m, properties with a pipeline length of up to 2000 m can be cooled to less than 20°C.
The all-rounder
Thanks to an innovative storage solution, it can be used in all existing and new chilled water units and cold water chillers.
The complete package
The pre-assembled compact unit with integrated circulation pump already contains all the necessary components for the drinking water side, it is insulated condensate resistant and preconfigured.
KHS CoolFlow chiller
Air-cooled chilled water unit for connection to the KHS CoolFlow cold water cooler
Demand-driven cold water production
- Maximum efficiency thanks to preconfigured controller connected to the
KHS CoolFlow cold water cooler - Infinitely variable cooling control with extremely low noise level of 68.5 dB(A)
- Low space requirement of less than 1.0 m² with a cooling capacity of up to 10.0 kW