Refrigeration heat exchanger cleaning

It is one of the more direct costs in industrial refrigeration. Scale raises condensing temperature, condensing temperature raises compressor lift, and lift sets power draw for every hour the plant runs. A fouled condenser is an energy penalty that accrues continuously, not a fault that appears occasionally.

Most plants already log discharge pressure and can compare it against commissioning figures at similar ambient. That comparison usually shows condenser cleaning to be among the shortest paybacks available on the site.

On a multi-cell condenser, yes: one cell is isolated and cleaned while the others carry the load, and the plant runs at reduced condensing capacity for the duration.

It is scheduled for cool weather and often overnight, because that is when the remaining capacity has the most margin. On a single-condenser installation it needs a genuine shutdown window, which usually means winter and a planned reduction in load.

Not if the work is planned properly. A loaded cold store has substantial thermal mass and holds temperature for a useful period with cooling off. Air cooler work is done section by section, so only part of the store is ever affected.

It needs planning against stock instead of against the engineer's diary. Low-stock periods, consolidating product away from the affected section, or timing the work to a delivery gap are all normal, and involving is whoever manages the stock early.

Ammonia is toxic and flammable, and any work that breaches the refrigerant circuit is specialist work under the site's own procedures, carried out by people competent on that plant.

For cleaning purposes the split is clean, and it is the single most useful thing to state in an enquiry. Water-side and air-side work, condenser coils, water circuits, air cooler fin blocks, does not touch the refrigerant circuit and is ordinary industrial cleaning. Oil draining and evaporator internals are not, and belong with the refrigeration contractor.

Because oil separation or oil return is not doing its job. Some carry-over from the compressors is normal and the system is designed to return it; oil accumulating at the evaporator means that return path is not working.

Draining it restores capacity and does not fix the cause. Worth investigating separator performance and the oil return arrangement at the same time, or the same accumulation and the same capacity loss will be back.

Yes. An evaporative condenser is a notifiable device under the same regime as a cooling tower, requiring a risk assessment, a written control scheme, and cleaning and disinfection at defined intervals with records kept.

That has a practical benefit: the compliance clean and the performance clean want the same access and the same isolation, so combining them means arranging one reduced-capacity window instead of two.

Condenser cleaning is priced on coil area and cell count and is fairly predictable. Air cooler cleaning is priced on unit count and access, and in a loaded cold store access is usually the larger part.

Set it against the energy, never the maintenance budget. On a scaled condenser the compressor power saving frequently pays for the work well within a year, which is a much better argument than the maintenance case.

Evaporative condensers annually at minimum, and the Legionella control scheme normally sets that anyway. Sites in hard water areas or dusty locations, and sites running warm through summer, often need more.

Air coolers are condition-driven and vary with what the store holds. A produce store fouls far faster than a packaged goods store. The trigger worth watching on both is head pressure and pull-down time against the commissioning figures.