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Ken Allen

Ken Allen
Get to know Ken Allen, Senior Sales Application Engineer. His areas of expertise include refrigerants, product development, and HVAC-R systems and design.
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Recent Posts

5mm Copper/Aluminum Coils - a Microchannel Alternative

Posted by Ken Allen on Jun 22, 2023 11:16:52 AM

In some cases, a 5mm copper tube, aluminum fin coil is a more durable and versatile alternative to microchannel designs. At SRC, we can match microchannel performance with 5mm Cu/Al for predetermined dimensions and conditions. Check out the video below to see Ken Allen, SRC's Southeast Regional Sales Manager, walk through that process in Enterprise, SRC's coil selection software.

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Is R-404A Being Phased Out & is R-449A a Good Retrofit Option?

Posted by Ken Allen on Jan 26, 2023 8:35:40 AM

The US started limiting HFC usage on January 1st, 2022, following the passage of the American Innovation in Manufacturing (AIM) Act of December 2020. Prior to the legislation, the EPA did not have the authority to make changes to HFC usage, and HFC policy decisions fell largely to the states, 11 of which had already begun HFC phasedown measures under the US Climate Alliance. The EPA's current phasedown schedule is aiming to reduce the production and consumption of HFCs by 85% below baseline levels gradually by 2036. This means that individuals and organizations that currently use HFCs like R-404A, for example, have a decision to make. 

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R-744 (CO2): Pros, Cons, & Comparisons to Other Refrigerants

Posted by Ken Allen on Jun 27, 2022 9:52:50 AM

Our Refrigerant Focus series delves into the history, properties, suitable applications, and pros and cons of some of today’s popular or otherwise noteworthy refrigerants. This installment will focus on R-744 (CO2).

Check out some of our refrigerant focus posts below.

History of CO2 as a Refrigerant

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HFC Phasedown Rule Final; EPA Lays Out Schedule, Allowances [Transcript]

Posted by Ken Allen on Nov 19, 2021 10:50:13 AM

Note: the following is a transcript of a podcast recorded on November 8, 2021. To listen, check out the SRC Podcast here or wherever you get your podcasts. 


Hello and welcome to another SRC podcast. On today's episode, we'll be talking about a new EPA rule regarding the phasedown of hydrofluorocarbons. We touched on this in our last recording, and since, there has been developments in terms of at that time, it was a proposed rule. It has now progressed to the point where it is a final rule. Since that development, we thought it'd be a good time to revisit this topic. Today, we're going to be talking about exactly what the implementation of that rule will look like, and then we'll also quickly review the contents of the rule. 

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EPA to Design HFC Phasedown Plan [Podcast Transcript]

Posted by Ken Allen on Nov 19, 2021 9:54:31 AM

Note: the following is a transcript of a podcast recorded on July 14, 2021. To listen, check out the SRC Podcast here or wherever you get your podcasts. 

Hello and welcome to another SRC podcast. For this recording, we're going to be focusing on a proposed new rule from the EPA that's titled "Phasedown of Hydrofluorocarbons: Establishing the Allowance, Allocation, and Trading Program under the American Innovation and Manufacturing Act."

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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

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

Transcritical CO2 Refrigeration: Basics and Benefits

Posted by Ken Allen on Jun 23, 2020 12:18:42 PM

Around 2010, the first refrigeration systems operating on transcritical CO2 began cropping up in North American supermarkets. Since then, usage of transcritical CO2 systems has grown steadily and they’ve become viable options for places like supermarkets, food warehouses, and ice rinks, as more organizations move away from traditional HFC refrigerants. Natural refrigerant market accelerator Shecco estimates that transcritical CO2 systems grew from 140 in 2008 (all in Europe) to more than 35,000 systems worldwide today.

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Topics: Food Storage & Processing, HVAC, Expertise, Engineering, Refrigerants

R-410A vs R-407C in Warmer Ambient Environments

Posted by Ken Allen on Jun 19, 2020 9:49:05 AM

There are dozens of commercially available refrigerant options on the market today, including numerous refrigerant blends, which aim to replicate the effectiveness of former workhorses like R22, the production of which was made illegal as of January of this year. Two popular examples of refrigerants developed in the last 30 years or so that are used in the HVAC industry are R-410A and R-407C. These two refrigerants are often used for similar applications, but they have some marked differences that should be understood and considered when deciding between them.


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Topics: HVAC, Coils, Efficiency, Expertise, Refrigerants

How to Choose the Appropriate Corrosion Resistant Coil Components

Posted by Ken Allen on Jun 8, 2020 10:41:09 AM

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

For commercial operations that rely on effective heat transfer, external corrosion of heat exchanger components is a major concern. When left unchecked, corrosion can significantly reduce a coil's effectiveness, but sometimes it’s difficult to know which anti-corrosion option best meets your needs.

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Topics: Refrigerated Display Case, Food Storage & Processing, HVAC, Efficiency, Reliability, Engineering