Mcquay hvac duct sizer software free download
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For example use long radius bends rather than right angles as the sudden change in direction wastes a huge amount of energy. We want to use the smoothest fittings possible for energy efficiency. The third thing we have to consider is the dynamic losses caused by the fittings. One is made from standard galvanised steel the other from fibreglass, the pressure drop over a 10m distance for this example, is around 11 Pa for the galvanised steel and 16 Pa for the Fibreglass. The second thing to consider is the material being used for the ducts, and the roughness of this material as this causes friction.įor example, if we had two ducts, with equal dimensions, volume flow rate and velocity, the only difference is the material. Friction in a system means the fan needs to work harder and this results in higher operating costs.Īlways use round duct where possible although in many cases rectangular duct needs to be used as space is limited. The larger perimeter also means more air will come into contact wit the material and this adds friction to the system.
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A round duct with a cross sectional area of 0. If we compare round duct to rectangular duct we see that. Ductwork comes in round, rectangular and flat-oval shape. The first one being the shape of the ductwork. Before we go any further we need to consider some things which will play a big role in the overall efficiency of the system. So just repeat that calculation for all the rooms. So if we drop those values in for room 1 we get a volume flow rate of 0. Now that we have that we can calculate the volume flow rate using the formula. So we just drop those numbers in and we get the density of air being 1. To do that we need the specific volume or density of the air. Now we can convert these into volume flow rates. So we just repeat that calculation for the rest of the room to find all the mass flow rates. If we look at the calculation for room 1, we see it requires 0. We know all the values for this so we can calculate the mass flow rate how many kilograms per second of air needs to enter the room. Now we need to convert the cooling loads into volume flow rates but to do that we first need to convert this to mass flow rate so we use the formula. The cooling load is usually the highest, as it is in this case. Once you have these, just tally them together to find which is the biggest Load as we need to size the system to be able to operate at the peak demand. The first thing we need to do is calculate the heating and cooling loads for each room. This is a really simple building it has just 4 offices a corridor and a mechanical room which is where the fan, filters and air heater or cooler will be located. Some of the new exciting features of DuctSizer are.How to design a duct system. The program allows the user to input multiple sections and view the overall results. DuctSizer calculates the friction loss in a section of duct, or calculates the.
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#Mcquay hvac duct sizer software free download download
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