Steam cleaning in the air conditioning area
Air conditioning steam cleaning tests were carried out in 2013 at one of our customers: the Soccram Ile de France (Cofely – GDF Suez).
During these tests, we were able to evaluate the efficiency of steam on the cleaning of an air treatment plant (CTA). Two Tests:
-On dirty filters were dismantled then a simple steam passage was carried out
-On the CTA
The parameters that characterise a collector are:
- The nature of the recuperator and its components (materials implemented, geometry of the exchanger (surface, fins, ...);
- The speed of air passage
- The respective flows of fresh air and stale air;
- The latent heat of the extracted air.
These parameters influence the yield whose value is generally given by the manufacturer.
It should be noted that in general, the performance of an exchanger increases with:
- The increase of the exchange surface: This parameter increases however the cost of the system and also tends to increase the load losses and thus the cost of the auxiliary (electric consumption of the displacement fans), so there is an optimum to Get.
- The decrease in the flow rate of fluids (fouling)
- The increase in the temperature difference between the two fluids: This parameter will have little effect in the case of a ventilation system, the temperature range being very limited (from-15 ° C to + 35 ° C)
- The increase in stale air flow (i.e. warm air) in relation to the new air flow (i.e. cold air)
Attention, if the building is overpressured, it is on the contrary the new air flow which is higher than the stale air flow.
It should be noted that, in view of the low range of temperature fluctuations, the exchange coefficient of a given collector may be considered constant.
As a result, for a swap surface A and whose fluid flows are fixed (which will generally be the case in recovery), the yield is independent of the inlet temperatures of the new air and the air released. So it is substantially constant.
|CTA before cleaning||CTA after cleaning|
Visually we found a very efficient dusting of filters:
In addition, blow-rate measurements were made after steam cleaning and validated the efficiency of steam cleaning for air conditioners:
-Before steam cleaning: 19700 m3/h
-After steam cleaning: 40700 m3/h
The steam cleaning of the CTA is very effective, it makes it possible to clean the filters thoroughly and carefully cleaning the fins and this without twisting or damaging them.
Device used: AC 3000
The steam of 175 ° C will have a powerful detergent action by dissolving dirt and fats. Combined with an 8 bar pressure, the vapour will remove dirt in depth and dislodge the soils in the inaccessible areas, especially in the condensers between the fins. The flow will allow mechanical action, stirring and staining of the dirt but without scratching the surfaces to be cleaned or twisting the often fragile fins.
In addition, the vapor can have a lethal effect on the microorganisms and thus allow to decontaminate the condensers, the coolers, the fins ...