HOW TO CHOOSE THE RIGHT AIR-COOLED CONDENSER?

How to Choose the Right Air-Cooled Condenser?

When selecting a refrigeration unit for a new installation, it is crucial to choose one that provides the desired cooling effect to reduce or maintain the temperature of the product. This capacity is typically expressed in Btuh. Unit coolers (evaporators), compressors, and metering devices are all selected based on the Btuh requirement of the chosen refrigerant. The only major component not selected based on this Btuh requirement is the condenser.

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The condenser must be selected based on the total heat rejection (THR) of the system, which is the sum of the heat energy absorbed by the evaporator and the additional heat energy added to the refrigerant by the compressor. This additional heat energy is known as the heat of compression. The heat of compression varies depending on the compressor design, so whenever possible, the compressor manufacturer's information should be utilized. If this information is not accessible, many condenser manufacturers provide reference tables to determine this value.

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It's not always necessary to select a separate air-cooled condenser; many times, condensing units come as comprehensive solutions. These units are selected based on the required Btuh capacity, and their condensers are pre-selected by the condensing unit manufacturer. However, systems that use remote air-cooled condensers require a separate condenser selection.

To begin the selection process, first determine the THR of the system by adding the heat of compression of the compressor (obtained from the compressor manufacturer's or condenser manufacturer's table). If the condenser is installed above sea level, a correction factor needs to be applied to the THR. The air cooled condensing units exporter will usually provide a table with the required correction factors.

Next, calculate the design temperature difference (TD), which is the design condensing temperature minus the design ambient temperature:

Design TD = Condensing Temperature – Ambient Temperature

For the type of refrigerant in the system, use the condenser manufacturer’s selection chart to choose a condenser based on THR and design temperature differences. Some manufacturers' charts may show the capacity of their condensers at a 1°F temperature differential. If necessary, you can determine the TD required at 1°F by dividing the THR by the design condenser TD:

THR/°TD = THR / Calculated Design Condenser TD

If the required THR falls between two condenser capacities on the selection table, choose the higher of the two. For example, for a remote air-cooled condenser with a net cooling demand of 225,000 Btuh at sea level, where the outdoor ambient temperature is 90°F and the design condensing temperature is 110°F, the appropriate THR would be 348,750 Btuh (225,000 Btuh x 1.55). The design condenser TD would be 20°F (110°F – 90°F).

Selecting the correct air-cooled condenser for the installation is a crucial step in ensuring the system operates effectively and at maximum efficiency.

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CAS GYW COLD CHAIN SYSTEM (JIANGSU) CO.,LTD. is a professional designer, manufacturer, and exporter of cold rooms and refrigeration systems. We boast over 15 talented cold storage experts and a 10,000 square meter factory. We have provided cold storage solutions to over 60 countries, including Asia, North America, East Europe, and the Commonwealth of Independent States. Our main products include cold storage design, polyurethane insulation panels, cold storage doors, industrial doors, condensers, air coolers, large-scale parallel units, ice machines, mobile cold storage, and other cold chain products.