How to Choose The Right Air-cooled Condenser

Choosing the correct refrigeration unit for a new installation is crucial to achieving the desired cooling effect to lower or maintain the product's temperature. This capacity is usually expressed in Btuh (British thermal units per hour). The selection of unit coolers (evaporators), compressors, and metering devices is based on this Btuh requirement. However, the condenser is the one major component that is not chosen based solely on the Btuh requirement.

Kendall products are recognized globally, serving various industries with an unwavering commitment to quality. We believe in offering our customers more value through superior products and services. Let’s work together towards a successful future.

The condenser should be selected based on the total heat rejection (THR) required by the system. THR is the total of the heat energy absorbed by the evaporator and any additional heat energy supplied to the refrigerant by the compressor. This supplementary heat energy is referred to as the heat of compression. Since the heat of compression can vary based on compressor design, it is advisable to utilize information from the compressor manufacturer when possible. If unavailable, many condenser manufacturers provide reference tables with these values.

Our Two-Stage Air Cooled Piston Condensing Unit combines advanced design with high performance, utilizing imported parts to ensure optimal output while occupying minimal space according to the latest standards. Equipped with Bitzer’s two-stage semi-hermetic compressor, our units are known for their reliability and top-quality performance. This advanced cooling mechanism has made our condensing units the preferred choice for clients worldwide.

While selecting an air-cooled condenser is not always necessary, many systems involve picking condensing units for installations. Typically, these units are chosen based on the required Btuh capacity, and the condensing units' manufacturer usually selects their condensers. However, systems that utilize remote air-cooled condensers necessitate separate condenser selection.

To initiate the selection process, first determine the THR of the system by adding the compressor's heat of compression, which can be obtained from the compressor or condenser manufacturer’s tables. For installations above sea level, a correction factor should be applied to the THR, which a condenser manufacturer usually provides in their specifications.

The next step is to calculate 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

For the refrigerant type in your system, consult the selection chart provided by the condenser manufacturer to select a condenser based on the THR and design temperature differences. Some manufacturers may represent their condensers' capacity at a 1°F temperature differential. If necessary, calculate the TD required at 1°F by dividing the THR by the design condenser TD as follows:

THR/°TD = THR ÷ Calculated design condenser TD

If the required THR falls between two condenser capacities on the selection chart, always opt for the higher capacity. As an example, when choosing a remote air-cooled condenser for a net cooling demand of 225,000 Btuh, consider that the unit will be installed at sea level, so no height correction is required. With a low-temperature system utilizing an R-404A semi-hermetic suction cooling compressor, a design evaporative temperature of -20°F, an outdoor ambient temperature of 90°F, and a design condensing temperature of 110°F, the THR would calculate to 348,750 Btuh (225,000 Btuh × 1.55). For this example, the design condenser TD would be determined as 20°F (110°F - 90°F).

Selecting the proper air-cooled condenser is essential to ensuring your system operates efficiently and effectively. For additional insights, please visit our website at air cooled condensing units exporter.

ABOUT US

Kendall is a distinguished manufacturer of refrigeration equipment, integrating research and development, design, production, and sales. As a high-tech enterprise, we specialize in intelligent energy-saving cold storage solutions, system integration, and control, alongside manufacturing, installation, and commissioning. Our company proudly holds 25 national invention patents and 73 utility model patents. Let us assist you in finding the perfect condenser for your project. When you contact us, please provide detailed requirements so we can deliver an accurate quotation.

Considerations for Air-Cooled Condensing Units

When setting up walk-in coolers and freezers, it is vital for the installation contractor to choose the appropriate location for the condensing unit. The placement is key to the overall success of the installation process. Several factors should be taken into account when deciding on the location.

Initially, consult with the customer about the chosen spot for the condensing unit. Ensure that the customer agrees with the proposed placement, as they may have a different plan in mind. As retail space costs rise, customers often seek to maximize their indoor area, which may lead them to request an outdoor installation or placement in a less intrusive indoor location.

If the condensing unit is intended for indoor installation, ensure there is adequate ventilation. Low-temperature condensing units typically require around 200 cubic feet per minute (cfm) per 1,000 Btuh, while medium-temperature units need about 165 cfm per 1,000 Btuh. Always verify ventilation requirements with the condensing unit manufacturer, as specifications may vary. Another factor to consider with indoor air-cooled units is the extra heat they introduce to the space, which may pose a problem for the equipment owner.

Outdoor Installation Considerations

Choosing to install the condensing unit outdoors is an alternative option. When located outside, there are several components that should be added to the condensing unit installation, some of which can be ordered as optional features.

A crankcase heater should be installed to prevent refrigerant migration during off-cycles when the condensing unit is exposed to colder temperatures than the evaporator. Additionally, it is essential to keep the high-side pressure above a minimum threshold during low outdoor temperatures, often accomplished using fan-cycling control or a head-pressure controller.

The method of controlling the case temperature may require adjustments as well. The system should incorporate a pumpdown approach to regulate the condensing unit's operation. A standard air-sensing temperature controller ought to manage the liquid line solenoid's functioning. Once the temperature controller criteria are met, it will close the liquid line solenoid, effectively trapping the refrigerant in the condenser and receiver, leading to a drop in low-side pressure. The low-pressure control will then deactivate the condensing unit as the low-side pressure reaches a designated limit. A defrost timer must also be integrated into the control system to ensure proper defrosting of the evaporator.

Furthermore, the outdoor unit should be covered for protection from environmental elements. If the condensing unit is designated for outdoor use, it generally comes paired with an enclosure. When transitioning an indoor unit outside, ensure proper construction of an adequate enclosure to safeguard the unit.

Finally, both indoor and outdoor installations necessitate consideration of service accessibility. It is not uncommon for technicians to encounter systems where the condensing unit's location complicates maintenance access. Make sure an electrical disconnect is available for cutting off the power supply as required.

Contact us to discuss your requirements for air cooled condensing units manufacturer. Our knowledgeable sales team is here to help you identify the best options for your needs.