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16 April 2023
HOW TO – efficient and effective process cooling


38% energy – this is how much you can easily save by using a well-chosen cooling technology.


For a 250 kW chiller, this translates to 159,000 kWh of energy saved per year.

At SZE, we design and build effective – i.e. optimally working and efficient – that is, using very little energy cooling systems.


But first things first.

The most important element is of course the chiller. We offer two types of machines:

  1. F-gas. These are uncomplicated, trouble-free and proven devices working with r410a. Their undoubted advantage is the fact that they are built with standard components that are easily and quickly available as spare parts.
  2. CO2 / r744 – These are the most modern, transcritical devices operating in a flooded system. Thanks to this, they consume very little energy, are ecological and resistant to harsh working conditions in industry.

Before we move on to saving energy, make sure that your cooling system is working properly. To achieve this, we always use large, insulated and carefully designed buffer tanks. They function as a cooling buffer, process water reserve and a hydraulic coupling.

To ensure constant access to sufficiently cold water for each device, it is necessary to use continuous circulation in the pipelines. The circuit works similarly to the circuit used in housing.

When we are sure that the system architecture is optimal, we can proceed to the selection of cooling source technology. Here we have at our disposal F-gas devices (r410, r134a, etc.), freecooling and CO2 (r744). The difference in energy consumption is significant and for a chiller operating for a year with a power of 250 kW, it is as follows:

  • r744 – 285,431 kWh/year
    r410 – 417,783 kWh/year
    r410 + freecooling – 380,623 kWh/year

The saving potential of a transcritical and flooded CO2 based chiller for 7/12C water is 38% or over 159,000 kWh/year.


Attention should also be paid to the amount of heat that can be recovered from the refrigeration system, which is more than 2,000,000 kWh/year.