![]() This is simple air diagnostics using the NCI method of room airflow estimation with your customer participating. Granted, there is a time and a place for this, but this isn’t the time. Purists will assess the wall insulation R-value, window U-value, and roofing material to complete a load calculation. Help them understand when airflow is increased to the required amount, the room will become comfortable.īefore you can use this diagnostic method, you’ll need to estimate required room airflow. (Blank) CFM would be required if the Manual J heating load was 62,000. Everyone instantly recognizes the problem and wants to find a solution. The airflow resistance produced by the duct system (Duct runs, fittings. The Architect/Engineers (A/E), Project Managers (PM), Resident Engineers (RE), Contractors, and Consultants should refer to the VA Directives, VA Policies, VA Design Alerts and Memorandums before each use of this design manual to note any updates that have been made since the last. This diagnostic method and explanation are straightforward and easy to understand. ![]() Then tell the customer how the room needs 180 beach balls of air per minute but is only getting 40 beach balls per minute. To make airflow easy to understand, you may explain how a 7′ beach ball holds one cubic foot of air. We use cfm as an acronym to describe a volume and time measurement (Let that sink in). Third, the room is 78% low on airflow ( 100% -22% = 78%).ĭon’t forget, airflow is difficult for your customers to understand. Second, the room only has 22% of the airflow it needs to be comfortable ( 40 cfm/180 cfm = 22%). First, the room is 140 cfm low on airflow ( 180 cfm – 40 cfm = 140 cfm). Heating Equipment Design Conditions Outdoor design DB:Indoor design DB: 21.9F68.0F Heat loss:24442BtuhEntering coil DB: 66.8F Manufacturer's Performance Data at Actual Design Conditions Equipment type:Manufacturer:Actual airflow:Output capacity: Gas furnaceTrane80038000cfmBtuh Model:TUH1B040A9H21B 155 of loadTemp. If needed, use a little math to clarify the problem in up to three separate ways. ![]() A 7′ beach ball contains one cubic foot of air. To help describe airflow, describe it as beach balls per minute. ![]()
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