What is an evaporative condenser?
An evaporative condenser is a heat exchanger for condensing a natural refrigerant gas, such as ammonia, or refrigerants of the freon family by means of the natural principle of evaporative cooling.
By taking advantage of the latent heat of evaporation of water, this principle allows heat to be subtracted from the refrigerant gas inside the heat exchanger and a small portion of the water sprayed onto the coil to evaporate.
Heat removal in the evaporative condenser is then accomplished by spraying water on the coils heat exchanger. The spraying of water takes place against a flow of fresh air, just as in the case of cooling towers at closed-circuit. Unlike the latter, however, it is refrigerant gas and not water that circulates within the heat exchange coils.
One of the benchmarks for selecting equipment remains the ambient wet bulb temperature, which is that temperature determined by means of the psychrometric diagram from the ambient temperature and relative humidity. Since the wet-bulb temperature is generally lower than the ambient temperature by about 4÷6°C (or even higher values), we can say that an evaporative condenser allows the refrigerant gas to condense at a temperature about 7-9°C higher than the wet bulb (BU).
As previously mentioned, evaporative condensers are cooling systems that use the principle of evaporative cooling to cool a refrigerant gas by matching water with air.
Just as in cooling towers at closed-circuit, in the case of evaporative condensers the gas remains inside the coils isolated from the external environment; thus, two separate circuits are generated:
That said, here is how an evaporative condenser works
The evaporation of water inside equipment is enhanced by Decsa through the use of high-efficiency "full-surface" HDGS coils and by balancing the L/G ratio to the best advantage. Thanks to careful and researched component selection, Decsa evaporative condensers ensure excellent performance, low consumption and, at the same time, minimal maintenance.
Evaporative condensers are key components of systems employing refrigeration cycles; in particular, they are used in the processes of industrial refrigeration and cold chain processes.
Below are the main areas of application:
Decsa evaporative condensers are designed in accordance with the Quality System certified to ISO 9001: 2015 standards and are designed in accordance with the 2014/68/EU (PED) directive. Available in the CFR-A axial-fan series and the CFR-C centrifugal-fan series, both models ensure minimum noise and maximum performance efficiency.
All of our evaporative condensers have coils exchange certified according to PED regulations, designed and tested at 40 bar-g. PED certification is mandatory on all coils installed on products at closed-circuit containing gas and intended for the European market. By qualitative choice, Decsa also provides the same type of battery for units intended for the non-European market. The special FULL SURFACE geometry of coils allows maximizing the exchange surface of coils itself.
Decsa evaporative condensers have a structure with HDGS-Z-725 hot-dip galvanized steel panels (725 g/sqm zinc coating). Optional additional protection DecsaCOATING Plus can also be applied upon request, which provides maximum protection on both flat surfaces and sheet punching.
The drift eliminators are made of vacuum-molded PVC foils. The special shaping, with low pressure drop, allows them to retain droplets entrained by the air stream, guaranteeing entrainment losses of less than 0.001%. The separator consists of a series of specifically designed sections, ensuring simple and quick routine maintenance of evaporative condensers.
More details about Decsa evaporated condensers? Contact us for more information and request a quote.
