11. April 2017

Cleaning of Commercial Refrigeration Systems

Necessity of cleaning heat exchanger surfaces on the example of supermarket refrigerated shelves

Cleaning of commercial refrigeration systems

Cleaning of commercial refrigeration systems such as supermarket refrigerated shelves

Cooling systems in general have the task of transporting heat.

In directly evaporating refrigeration systems, the evaporation of liquid refrigerant absorbs heat from the evaporator and releases it via the condenser.

The evaporator and the condenser are elementary important components of a commercial refrigeration system.

To ensure the heat transfer to these two components of the refrigeration system, the maintenance is very important. Only with a completely clean heat exchanger surface lossless heat transfer is possible and economic operation guaranteed. Because every pollution costs money.


The evaporator:

At the evaporator heat absorption takes place in a refrigeration system. Here, by regulating the evaporation temperature, the liquid refrigerant, by the absorption of ambient heat, evaporates> hence the term "evaporator".

The evaporator fan, colloquially also called "fan", ensures a permanent air flow over the heat exchanger surfaces and promotes the warm air through the cold evaporator.

Due to external influences (eg dust, food residues, packaging materials, etc.), contamination of the heat transfer surfaces (lamellae) inevitably occurs. Thus, the heat transfer from the air to the evaporator surface is disturbed.


Consequences of a polluted evaporator:

  1. Disturbance of the air duct in the refrigerator
  2. Power reduction of the refrigerator
  3. no adequate cooling of the goods
  4. longer running times due to reduced cooling capacity
  5. increased power consumption
  6. Icing of the heat exchanger leading to failure of the cooling
  7. clogging of condensate drainage and drainage pipes
  8. hygienic defects due to mold formation

Image: LKD Servie Group


The condenser

The purpose of the condenser is to discharge the heat absorbed in the refrigeration unit to the ambient air, outside the building. However, this only works with well-maintained heat exchanger surfaces. Again, the "fans" have the task to promote the air to the heat exchanger surface so that a better heat transfer from the condenser to the ambient air can take place.

The external influences such as dust and pollen "clog" the fins of the condenser very quickly, the air flow is impaired or completely interrupted which leads to "overheating" of the refrigeration system. It comes to high pressure failure and thus to the failure of the system.


Consequences of a polluted condenser:

  1. Reduction of cooling capacity
  2. increased power consumption
  3. inevitable failure of the system


A clean and well-maintained refrigeration system saves you money!

Image: LKD Servie Group

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