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Posted on: January 6, This translates to an increased use of electric heat pumps as opposed to fuel-fired appliances. Heat pumps have always done a great job providing cooling, and some heating.
Modern variable-capacity equipment provides for very robust heating capacity too. When heat pumps are oversized in areas where there are humid summer conditions, comfort is often compromised, especially during milder and wetter shoulder seasons. Another big problem with any type of equipment oversizing is excessive wear. Oversized equipment starts and stops far more often than right-sized equipment.
The excessive starts jolt the compressor and motor windings into action, and a few minutes later, it shuts down. Original equipment manufacturers OEM do a great job building durable products. However, even great products will fail faster when they must start and stop thousands of times more often than right-sized equipment. This article focuses on variable-capacity heat pumps. If you want to learn more about electrification, please look here.
Finally, if you need an overview of variable capacity heat pump equipment, I recommend you speak with your favorite distributor. Some OEMs do this better than others. This will tell you how it works in your area because Seattle is different than Phoenix, which is different than Denver, which is different than Miami. Variable-capacity equipment can operate at several different speeds, but each product has a maximum and minimum compressor speed.
So, to use the new heat pump sizing guidance, the OEM will need to provide the capacity at these speeds for a range of operating conditions, and the maximum and minimum compressor speeds. Minimum Compressor Capacity: This is the lowest capacity documented in the performance data at the operating conditions. Also known as Minimum Capacity MinC.
Manual S sets this new limit at 0. Another way to think about this is that the least amount of heat that the variable-capacity equipment can produce must be 20 percent smaller than the heating load.
This ensures that the heating system cannot satisfy the heating load at low speed. This new definition and sizing metric opens the door to use heat pumps to be the sole source of heat in a home. Heating Loss: Homes lose heat at different rates for different reasons. Location: homes in Chicago lose heat fast than homes in Houston. Construction: tight and well-insulated homes lose less heat than leaky uninsulated homes. You get the idea.
Size Factor: This is the equipment capacity divided by the load. Since there are different types of capacities and loads heating, total cooling, sensible cooling, latent cooling, etc. The intent of these terms was to simplify the guidance, create concise requirements, and make them easier to understand and use.
This article discusses how to use the minimum compressor heating size factor. Winter heating is necessary, but in Daytona, cooling is king.
This unit provides the cooling capacity to meet the load and has an abundance of latent capacity. Then it can be adopted by code, or promoted by an energy efficiency program, or accepted by your local jurisdiction. Member Login. Accreditation What Is Accreditation? Heating: Meet the heating load at maximum heating capacity the heating size factor must be 1.
As mentioned, the variable-capacity equipment can produce must be 20 percent smaller than the heating load. Give your customers the comfort they want and a system that will serve them for years to come. Author Recent Posts. Wes Davis. He can be reached at wes. Latest posts by Wes Davis see all.
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