TD of Refrigeration Evaporators
We have discussed DTD (Design Temperature Difference) quite a bit for air conditioning applications, but what about refrigeration? Let's start by defining our terms again Suction Saturation Temperature Saturation temperature is the temperature the refrigerant will be at a given pressure if it is in the process of changing state. This change of state would […]
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Impacts of Decreasing Evaporator Air Flow
Airflow, Airflow, Airflow…. when we setup and commission comfort cooling and heating systems we need to pay more attention to airflow before we worry about the fancy controls or the refrigerant circuit. So as a thought exercise let's consider a typical 2-ton, straight cool, TXV, residential system and think through what happens when we alter […]
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Some Important Terms to Know
In my recent classes with my employees at Kalos, we've been going over finding target pressures and temperatures for an air conditioning system. The goal has been to get techs to have “target” readings in mind before they start connecting tools. This step is an important part of being able to “check a system without […]
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Hydronics GPM Calculation and more…
This tech tip was written by a friend of HVAC School, Brian Mahoney. He is an HVAC instructor at Western Suffolk BOCES/Wilson Tech. Thanks, Brian! The podcast on delta T for A/C the other day got me thinking about the formula I learned in school about calculating the GPM of a hydronic system. We will […]
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