• Cooling India
  • Aug 15, 2016

Let ACs + Business Bloom

Spring is right time for HVAC cleaning, we have seen in my Feb article, about deep coil cleaning, let us follow the same footsteps of cleaning coils, make coils as good as brand new shiny fins, so that maximum Heat Exchange takes place...


Indian summers are nowadays very different from earlier ones. In summer, we see so many incidents of AC failure, compressor blast, injuries of various types to technicians when working on units... Sometimes even the brand new, just installed, Air Conditioning unit fails to cool.

  So let us see, how to bring the best out of working ACs. New air conditioning units are more coil compact, with fine fins, more fins / inch, slit fins etc, making them most difficult to clean, but with technology and professional equipment, you can make them a cake walk to success!

  Spring is the right time for Heating Ventilation & Air Conditioning (HVAC) systems’ cleaning. We have seen about deep coil cleaning, in my February article.

  Let us follow the same footsteps of cleaning coils, make coils as good as brand new shiny fins, so that maximum Heat Exchange takes place.

HVAC CLEANING

Useful Tips for Spring Cleaning

Use professional pumps for coil cleaning, for normal window, split, etc 2-3 row coil, work with low pressure, say max 30-35 bar pressure unit with max approx.3- ltrs / minute water flow! Small gun helps to work in tight area, and various additional accessories available with professional pump will make cleaning an easy way to success.

Cleaning with professional pump & effective coil cleaners will instantly improve unit cooling efficiency and reduce power consumption, which is measurable by Amp meter. Pl. make note of Amp meter reading before and after cleaning. For more data, also check CFM and Temp. Reading at the coils, before and after cleaning.

Ensure right coil cleaners being used, avoid Caustic at all cost, 90% of cleaning is possible with aerosol type pressure of plain water from professional pump, chemical required only in cases, where, oil, grease, solvents, bio growth (on cooling coil), corrosive deposits etc., are found on coil. Avoid air blower cleaning, they are useless, but just spreads contamination from one place to other, hardly 30-50% dust comes out, sometimes it blows deeper in the coil, thereby reducing cooling efficiency.

Spring cleaning leads to max / original cooling effect, reduces compressor working load, and compressor failures also can be reduced to greater extent (possibly up to 75% of compressor failures can be reduced, except for other technical reasons that cause variations from site to site).

Units facing sea side, saline environments, requires continuous (monthly/ bi-monthly, or as per site demand) cleaning during monsoon and especially after monsoon period. Or else salts melt when sun shines brightly leading to fins corrosion and its decay.

Cleaning of salts with plain water only is essential, clean for longer duration, do not get fooled by seeing coil clean in short time, as salt melts in water and make thin coating, which can be seen later, when fins surface dries up. So, take more time for cleaning.

• Clean coils’ bottom area with longer duration, as all contamination, exit from this area, and ensure nothing is left inside the coil area.

• R&D labs, Saris, Dress Material show rooms, Beauty parlor, Pathology labs, Kitchen area and its adjacent area coils need much frequent cleaning, than other areas.

• Condenser coils located near kitchen ducts need degreaser chemical cleaning.

• DG radiator sets need water base solvent coil cleaners, for effective cleaning, as acid / alkali coil cleaners can have corrosive effect on copper coils, brazing joints.

• Coils during installation, if those are coated with special chemicals:

– will reduce cleaning frequency
– cooling coils turn to ‘self cleaning coils’
– Condenser coils fins have better corrosion resistant effect
– All future cleanings are with aerosol type plain water jet pressure only
– Cooling efficiency is constant for 4-6-8 + rows coils, as condensate water sweeps away contamination continuously, on slippery fins surface. Such coils coating does not affect heat transfer efficiency of the coils, if professional coatings are used.
– Fins coating can be done for deep coils on new / old coils, by professional help.


AUTHORS CREDIT

MAHESH MEHTA

EcoChemPlus, Mumbai