Should I retrofit my R-22 coils for R-410A?

Posted by Al Nord on Oct 12, 2020 12:00:14 PM

Today, most new air conditioning system components that would have used R-22 prior to its regulation are now designed to operate with R-410A, but R-22 systems, such as commercial split systems for example, still exist. This means that when a coil reaches the end of its service life, the system engineer has a decision to make: replace the system or convert the existing equipment to operate on R-410A.

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What is a refrigerant distributor and what does it do?

Posted by Ken Allen on Oct 5, 2020 12:17:44 PM

In a refrigeration circuit, the evaporator coil plays a critical role. Part of its responsibility is creating the controlled pressure drop necessary for the refrigerant to change phase, the bulk of which occurs via the system’s metering device, such as a thermostatic expansion valve (TXV).

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Topics: Refrigerated Display Case, Computer & Electronics Cooling, HVAC, Coils, Efficiency, Expertise, Refrigerants

How are ethylene glycol and propylene glycol different and which should I use?

Posted by Will Klick on Sep 28, 2020 3:35:57 PM

For low-temperature hydronic systems, systems in which chillers and AHUs are located outdoors, or other equipment used in low-temperature processes, some form of glycol is a critical ingredient. It works to lower the fluid’s freezing temperature, enabling lower-temperature operation and preventing freezing.

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Topics: Food Storage & Processing, Ground Support, Coils, Heat Exchangers, Efficiency, Expertise, Reliability, Engineering

What is flux entrapment and how does it happen?

Posted by Super Radiator Coils on Sep 15, 2020 9:01:47 AM

There are terrific braze joints, awful braze joints, and everything in between. Today, we’ll examine one type of defect that can have devastating effects on joint integrity – flux entrapment.

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Topics: Coils, Heat Exchangers, Expertise, Quality

Design considerations for evaporators used in the storage of potatoes, onions and other crops

Posted by Super Radiator Coils on Sep 9, 2020 11:35:08 AM

This article has been updated. It is accurate as of 9/23/20.

Heat exchangers used for different applications need different design features. For example, in industries like pulp and paper, lower fins per inch (FPI) are often included to reduce airside fouling and to make for easier cleaning. Other applications such as the military are often concerned with weight, which impacts material selection. For this post, we're going to focus on some unique design choices we often include when building heat exchangers for the refrigerated storage of potatoes, onions, beets and other vegetables.

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Topics: Food Storage & Processing, Coils, Heat Exchangers, Quality, Reliability

Other than copper and aluminum, what materials are used to build heat exchangers?

Posted by Super Radiator Coils on Sep 8, 2020 8:27:34 AM

In many of the industries we serve, heat exchangers made with copper tubes and aluminum fin are extremely popular, and very often, these materials are a terrific choice. But copper and aluminum aren’t suited for everything. At Super Radiator Coils, the needs of many of our customers often dictate that we explore and understand alternative materials.

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Topics: Gas Compression, Military, Power Generation, Coils, Heat Exchangers, Nuclear Products, Expertise, Quality, Engineering, Turbine Inlet Air Cooling and Heating

Lighter, stronger, smaller. 5mm stainless steel heat exchangers are the next little thing in heat transfer

Posted by Super Radiator Coils on Aug 31, 2020 4:06:11 PM

High pressure tolerance. Low weight. Resistant to corrosion. For some heat exchanger applications, these characteristics aren’t optional. On land, in the air, or at sea, heat transfer equipment must stand up to extreme environments – and we’ve developed a product built to do just that.

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COVID-19 & HVAC - Q & A with Dr. William Bahnfleth, ASHRAE’s Epidemic Task Force Chair

Posted by Super Radiator Coils on Aug 25, 2020 6:30:00 AM

In March of this year, doctors and scientists responded quickly with information on COVID-19 to keep individuals – and the public at large – safe from the spread of the airborne illness. As healthcare workers and researchers worked around the clock, the heating, ventilation, air conditioning and refrigeration industry mobilized too.

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Turbulators in heat exchangers: types and purposes

Posted by Ken Allen on Aug 4, 2020 11:43:32 AM

In fin tube heat exchangers, the fluid (gas/water/glycol/refrigerant/etc.) circulating through the coil’s tubes is extremely important for the coil’s overall performance – it’s half the battle, along with airside heat transfer. The degree to which the fluid contacts the tube walls affects the coil’s performance and influences a system's overall efficiency – the more the fluid comes into contact with the tube wall, the better – and more economical – the heat transfer.

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Topics: Coils, Heat Exchangers, Efficiency, Engineering

Airside fouling in heat exchangers: causes and solutions

Posted by Louis Rogerson on Jul 13, 2020 6:02:25 PM

Fin tube heat exchangers are subject to fouling, which takes place as long as there is an airflow or waterflow in the unit. Defined as thermal resistance due to the accumulation of contaminants on heat transfer surfaces, fouling negatively affects heat exchanger efficiency, longevity, and increases system operating costs.

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Topics: Ground Support, Computer & Electronics Cooling, HVAC, Coils, Efficiency, Turbine Inlet Air Cooling and Heating

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