CO₂ Chats | What is the critical point of CO₂?
Emerson’s Andre Patenaude, director – solutions strategy, answers this question and what it looks like when a system operates above and below the critical point (87.8 degrees Fahrenheit).
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CO₂ in Commercial Refrigeration
Prepare for the widespread adoption of CO₂ by learning from Emerson's experts and exploring our breadth of CO₂ resources.
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CO₂ Chats | What are typical operating pressures of a CO₂ transcritical booster system?
Emerson’s Andre Patenaude, director – solutions strategy, answers this question and where these pressures occur in a system to give contractors a level of comfort.
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CO₂ Chats | What’s the triple point of CO₂, and why is that important to know?
Emerson’s Andre Patenaude, director – solutions strategy, answers this question and shares how this affects saturation pressure in a system.
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CO₂ Chats | How should you charge a CO₂ refrigeration system?
Emerson’s Andre Patenaude, director – solutions strategy, answers this question and discusses the importance of understanding the triple point pressure of CO₂ and how to effectively charge a system.
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CO₂ Chats | How do you preserve system charge during a CO₂ refrigeration system shutdown?
Emerson’s Andre Patenaude, director – solutions strategy, answers this question and what actions or mitigation strategies should be put in place depending on how long the system shutdown takes place.
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CO₂ Chats | How do you avoid CO₂ evaporators from flooding in the event of a power outage?
Emerson’s Andre Patenaude, director – solutions strategy, answers this question and shares how pulse width modulated valves, stepper valves and case controls are used to prevent flood back.
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CO₂ Chats | How should you store CO₂ refrigerant?
Emerson’s Andre Patenaude, director – solutions strategy, answers this question and discusses the importance of first understanding local building codes for storing CO₂ refrigerant.
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CO₂ Chats | How do you detect leaks in CO₂ systems?
Emerson’s Derek Langenkamp, product manager, answers this question and shares the importance of a leak detector to detect the colorless and odorless CO₂ refrigerant.
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CO₂ Chats | What is trapped liquid in a CO₂ refrigeration system?
Emerson’s Derek Langenkamp, product manager, answers this question and how liquid can get trapped between valves which then prompts the need for the system to be fitted for pressure relief valves.
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CO₂ Chats | How do HFC refrigerant properties compare to CO₂?
Emerson’s Derek Langenkamp, product manager, answers this question and breaks down the unique performance and operating characteristics of CO₂ refrigerant that dictate system design.
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CO₂ Chats | Can you describe a CO₂ transcritical booster system and how it works?
Emerson’s Andre Patenaude, director – solutions strategy, discusses how the low-temp compressors discharge into the medium-temp compressors which boost into the gas chamber.
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CO₂ Chats | How is a CO₂ cascade system configured, and how does it work?
Emerson’s Andre Patenaude, director – solutions strategy, answers this question and describes the two stages within a cascade system – high stage and low stage – and what refrigerants are used in both
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CO₂ Chats | Why is an adiabatic gas cooler used in CO₂ systems?
Emerson’s Andre Patenaude, director – solutions strategy, discusses how the pre-adiabatic cooling pads and coils from the condenser help the CO₂ system operate more efficiently at lower pressures.
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CO₂ Chats | How do you ensure energy efficiency in a CO₂ system?
Emerson’s Andre Patenaude, director – solutions strategy, shares how energy efficiency is dependent upon many factors: ambient, humidity, availability of water, cost of water and peak demand charges.
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CO₂ Chats | What does parallel compression mean when referring to CO₂ systems?
Emerson’s Andre Patenaude, director – solutions strategy, answers this question and discusses how there is an additional suction group with an extra parallel compressor added to the rack.
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CO₂ Chats | Can heat reclaim be used with CO₂?
Emerson’s Andre Patenaude, director – solutions strategy, answers this question and shares that CO₂ is a great refrigerant to use for heat reclaim and gives examples of using it in various scenarios.
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CO₂ Chats | Why is CO₂ high pressure management so important in CO₂ systems?
Emerson’s Andre Patenaude, director – solutions strategy, describes the importance of the gas cooler, high-pressure valve and flash tank being set up correctly from the start to manage CO₂ systems.
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CO₂ Chats | What does it mean to optimize coefficient of performance in a CO₂ system?
Emerson’s Andre Patenaude, director – solutions strategy, shares that at every single gas outlet temperature, the pressure can be adjusted to find the most efficient coefficient of performance.
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CO₂ Chats | What is meant by transcritical and subcritical operation when it comes to CO₂ systems?
Emerson’s Andre Patenaude, director – solutions strategy, describes when a system is above the critical point (87.8 degrees F), it’s in transcritical mode – when below, it's in subcritical mode.
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CO₂ Chats | Are there safety issues to be aware of when handling CO₂ refrigerant?
Emerson’s Derek Langenkamp, product manager, answers this question and shares the importance of having the right training and equipment to safely handle this refrigerant.
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