Converting Heating and Cooling Loads to Air Flow Needs

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Subtitle: 
Here’s how Manual J software takes your inputs and gives you both the BTU/hour and cfm needed for each room

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When you embark on the project of educating yourself about building science, one of the first things you encounter is the concept of heating and cooling loads. Every building has them. (Yes, even Passive House projects.) That’s why we do heating and cooling load calculations. We enter all the details of the building, set the design conditions, and get the heating and cooling loads for each room in the building.

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Converting Heating and Cooling Loads to Air Flow Needs

Prime: 
prime

Subtitle: 
Here’s how Manual J software takes your inputs and gives you both the BTU/hour and cfm needed for each room

Images: 

When you embark on the project of educating yourself about building science, one of the first things you encounter is the concept of heating and cooling loads. Every building has them. (Yes, even Passive House projects.) That’s why we do heating and cooling load calculations. We enter all the details of the building, set the design conditions, and get the heating and cooling loads for each room in the building.

read more

How Many Tons of Air Does a 2.5 Ton Air Conditioner Move?

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Subtitle: 
And under what conditions would it move exactly 2.5 tons of air?

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We live in this invisible stuff called air. (But of course you knew that.) We pump it into and out of our lungs. We exhaust it from our bathrooms and kitchens. We cycle it through our heating and air conditioning systems. If we’re lucky, we live in a home that even brings outdoor air inside as part of a whole-house ventilation system. But we’re missing something.

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How Many Tons of Air Does a 2.5 Ton Air Conditioner Move?

Prime: 
prime

Subtitle: 
And under what conditions would it move exactly 2.5 tons of air?

Images: 

We live in this invisible stuff called air. (But of course you knew that.) We pump it into and out of our lungs. We exhaust it from our bathrooms and kitchens. We cycle it through our heating and air conditioning systems. If we’re lucky, we live in a home that even brings outdoor air inside as part of a whole-house ventilation system. But we’re missing something.

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When Are Door Undercuts Sufficient for Return Air?

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Subtitle: 
You don’t always need to install individual returns, transfer grilles, or jumper ducts

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Most people don’t know that simply closing a door in their home can make them sick, increase their energy bills, or reduce their comfort. We live in this invisible stuff called air. We pull many pounds of it into our lungs each day. A typical air conditioner, heat pumpHeating and cooling system in which specialized refrigerant fluid in a sealed system is alternately evaporated and condensed, changing its state from liquid to vapor by altering its pressure; this phase change allows heat to be transferred into or out of the house. See air-source heat pump and ground-source heat pump., or furnace easily moves 20 tons of air a day. (Yes, I’m talking about 40,000 pounds! We’ll save that calculation for another day, though.) And the simple act of closing a door changes the dynamics of a house in ways that can have profound impacts on the people inside the home.

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