Introduction to Market Refrigeration for HVAC Techs w/ Matthew Taylor

June 19, 2024

Matthew covers the key differences between residential/commercial air conditioning systems and the parallel rack refrigeration systems found in supermarkets. He explains how the core refrigeration cycle concepts are the same, but the physical setup, components, and control strategies differ in market refrigeration.

Some of the topics covered include:

Major components like compressor racks, condensers, and evaporator cases

Control systems and sensors for precise temperature/pressure regulation

Maintaining different evaporator temperatures for product zones (freezers, coolers, etc.)

Defrosting strategies for evaporator coils running below freezing

Reclaim systems that recycle compressor heat for hot water or dehumidification

Split condensers and fan staging for low ambient operation

Whether you’re an HVAC tech looking to understand grocery store refrigeration better or just interested in learning about this specialized area, Matthew’s engaging presentation provides a clear overview. The session allows for participant questions throughout.

Buy your virtual tickets or learn more about the 5th Annual HVACR Training Symposium at https://hvacrschool.com/symposium.

Read all the tech tips, take the quizzes, and find our handy calculators here or on the HVAC School Mobile App for Apple and Android.

##hvacschool #hvac #HVACR #HVACREducation #hvactech #MarketRefrigeration #RackRefrigeration

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Chris Hughes and Steve Rogers from The Energy Conservatory discuss TEC’s TrueFlow technology and its crucial role in predicting airflow issues in the sales process, particularly for heat pump retrofits. They explain how the TrueFlow app helps contractors accurately measure both static pressure and airflow in existing systems, enabling them to predict whether proposed equipment changes will work effectively. This is especially vital when considering the growing trend of replacing gas furnaces with heat pumps, as the airflow requirements can differ significantly.

The conversation delves into a detailed example of replacing an 80% efficient 48,000 BTU furnace with a heat pump. They demonstrate how the airflow requirement would nearly double from 652 CFM to 1,200 CFM, potentially causing the static pressure to quadruple due to Fan Law 2 principles. This dramatic increase could lead to significant performance issues if not properly addressed during the system design phase. The experts emphasize that using TrueFlow during the sales process allows contractors to identify potential problems and necessary modifications before installation rather than discovering issues during callbacks.

The discussion also covers the ideal workflow for system assessment and sales, starting with customer comfort evaluation and proper load calculations. It’s important to reduce loads through envelope improvements when possible, particularly in cold climates where heat pump retrofits are becoming more common. Proper system sizing often means going smaller rather than larger, contrary to common industry practices, and the worst HVAC systems are often found in expensive custom homes rather than tract housing.

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TrueFlow technology and its role in system forecasting
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Introduction to Market Refrigeration for HVAC Techs w/ Matthew Taylor

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