How to Choose air cooled condensing units manufacturer?

Identifying the Best Air-Cooled Condensing Unit Manufacturer

When setting up new refrigeration equipment, it’s essential to choose components that ensure optimal cooling performance to either reduce or maintain the temperature of your product. This cooling capacity is usually measured in Btuh. While the evaporator, compressor, and metering devices are chosen based on the Btuh requirement for the chosen refrigerant, the condenser is selected a bit differently.

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Total Heat Rejection Considerations

The choice of a condenser depends on the system’s Total Heat Rejection (THR). THR is the total of the heat energy absorbed by the evaporator and the heat energy added to the refrigerant by the compressor, known as the heat of compression. This heat of compression varies according to the compressor design, so it’s essential to use the compressor manufacturer's data whenever possible. If this info is unavailable, condenser manufacturers usually provide reference tables to estimate this value.

Selecting an air-cooled condenser is often not mandatory since condensing units are sometimes chosen for installations. The manufacturer of the condensing unit often selects the condenser based on the required Btuh capacity. However, for systems that utilize remote air-cooled condensers, the condenser must be selected separately.

Steps in Selecting an Air-Cooled Condenser

1. Determine the THR

Begin by calculating the system’s THR by adding the compressor’s heat of compression, obtainable from the compressor manufacturer or condenser manufacturer's table. If installing the condenser above sea level, apply a correction factor to the THR, usually provided in a table by the condenser manufacturer.

2. Calculate Design Temperature Difference (TD)

Next, compute the design temperature difference (TD), which is the difference between the design condensing temperature and the design ambient temperature:

Design TD = Condensing Temperature - Ambient Temperature

3. Use the Manufacturer’s Selection Chart

For the refrigerant type used in your system, refer to the condenser manufacturer's selection chart to choose a condenser based on the THR and the design TD. Some charts show condenser capacity at a 1°F temperature difference. To determine the required TD at 1°F, divide the THR by the design condenser TD:

THR/°TD = THR ÷ Calculated Design Condenser TD

If the THR falls between two capacities on the chart, opt for the higher capacity. For instance, for a system needing 225,000 Btuh with a condenser installed at sea level (so no altitude factor required), using an R-404A semi-hermetic suction-cooled compressor with design temperatures of -20°F evaporating and 110°F condensing in a 90°F ambient, and utilizing a 1.55 multiplication factor, the THR becomes 348,750 Btuh. With a 20°F design condenser TD (110°F - 90°F), use the manufacturer’s table to select the appropriate air-cooled condenser.

Choosing the correct air-cooled condenser is critical to ensure the refrigeration system operates efficiently and effectively.

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