Rack Refrigeration Cycle Part 10 – Electronic Expansion Valves

November 17, 2024

In Part 10 of our Rack Refrigeration Cycle series, Matthew Taylor breaks down Electronic Expansion Valves (EEVs) and their growing role in modern refrigeration systems.

Learn about:

How electronic expansion valves work compared to mechanical valves
The importance of valve controllers and superheat calculation
Common troubleshooting issues with EEVs
Step counting and valve position tracking
Best practices for valve initialization and maintenance
Pulse Width Modulation (PWM) valves and their operation
Sensor placement and maintenance tips
EEV mechanical components and operation
Controller functionality and limitations
Valve synchronization methods
PWM valve timing and control cycles
System maintenance and common failure points

#commercial refrigeration #EEV #electronic expansion valve #market refrigeration #Rack refrigeration #refrigeration

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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.

Key Topics Covered:

TrueFlow technology and its role in system forecasting
Fan Law 2 and its impact on static pressure when changing airflow
Heat pump retrofit challenges and considerations
The importance of accurate load calculations
Dual fuel systems as a solution for cold climates
The relationship between airflow and static pressure
Sales process integration of technical measurements
Common issues with oversized equipment
The importance of envelope assessment
Methods for reducing system loads
Proper duct sizing and modification strategies
The role of proper filter sizing and selection
The benefits of flat-rate pricing for duct modifications
Training resources and support available for TrueFlow users

Check out TEC’s YouTube channel at https://www.youtube.com/@energyconservatory, and you can visit TEC’s website at https://energyconservatory.com/.

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Rack Refrigeration Cycle Part 10 – Electronic Expansion Valves

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