Check airflow to each room with an anemometer; also install more large filtered return grille areas...! Buy 'a low cost' LaCrosse Model: EA-3010U; get the sf K value of the grille; convert mph to fpm by *X by 88 that velocity number *X sf K value of the grille = CFM. If you use Manual J load-cal & Sizing in SW WI the heating & A/C CFM's will be close to the same because there is up to a 60°F or sometimes up to a 70°F temp-rise in heating & only about a 20°F temp-drop in cooling; you can use it to target cooling blower speed selections. This is an easy way to get a reference record of the CFM of your system... you should have access to the mfg'ers graphs or airflow charts showing the various static pressures at different blower motor speed selections CFM Airflow should always be checked & a Record left with the unit... I have a 60-K 95% propane furnace or 57000-Btu/hr Output, no central A/C; Temp-rise 59°F * 1.08 is 63.72; 57000 / 63.72 is 894-CFM. Approximate CFM… Simple & easy to post a permanent reference CFM for a system... There is virtually no-one checking airflow CFM before charging an air conditioner or heat pump system. This is very essential in order to accurately charge the system, therefore, I will provide the easiest way to get a record of the CFM on the system; you are checking to see if it falls within the 350 to 400 CFM, or in hot dry climates up to 450 CFM per ton category. You need to get it there…! During the Spring, Fall, and Winter months and even early morning in the Summer months you can use the furnace BTU Output and temperature-rise above the return air temperature; multiply it by 1.08 & then divide that number into the Btu/hr Output to get a pretty good CFM airflow number. It is close enough to get it within the correct CFM Zone… If your air flow is not correct you will be getting false superheat and sub-cooling readings. There is virtually no-one checking airflow CFM before charging an air conditioner or heat pump system. This is very essential in order to accurately charge the system, therefore, I will provide the easiest way to get a record of the CFM on the system; you are checking to see if it falls within the 350 to 400 CFM, or in hot dry climates up to 450 CFM per ton category. You need to get it there…! During the Spring, Fall, and Winter months and even early morning in the Summer months you can use the furnace BTU Output and temperature-rise above the return air temperature; multiply it by 1.08 & then divide that number into the Btu/hr Output to get a pretty good CFM airflow number. It is close enough to get it within the correct CFM Zone… If your air flow is not correct you will be getting false superheat and sub-cooling readings. C’mon guys, it’s time to start doing things close to the RIGHT Procedural WAY…!
Is it good idea to measure the flow rate at the suction side of a blower? Kindly give some idea. On delivery side of the blower, I dont have much long pipe network for making accurate flow measurement.
Looking forward to part 2
Thanks
Check airflow to each room with an anemometer; also install more large filtered return grille areas...! Buy 'a low cost' LaCrosse Model: EA-3010U; get the sf K value of the grille; convert mph to fpm by *X by 88 that velocity number *X sf K value of the grille = CFM.
If you use Manual J load-cal & Sizing in SW WI the heating & A/C CFM's will be close to the same because there is up to a 60°F or sometimes up to a 70°F temp-rise in heating & only about a 20°F temp-drop in cooling; you can use it to target cooling blower speed selections.
This is an easy way to get a reference record of the CFM of your system... you should have access to the mfg'ers graphs or airflow charts showing the various static pressures at different blower motor speed selections
CFM Airflow should always be checked & a Record left with the unit...
I have a 60-K 95% propane furnace or 57000-Btu/hr Output, no central A/C; Temp-rise 59°F * 1.08 is 63.72; 57000 / 63.72 is 894-CFM. Approximate CFM…
Simple & easy to post a permanent reference CFM for a system...
There is virtually no-one checking airflow CFM before charging an air conditioner or heat pump system. This is very essential in order to accurately charge the system, therefore, I will provide the easiest way to get a record of the CFM on the system; you are checking to see if it falls within the 350 to 400 CFM, or in hot dry climates up to 450 CFM per ton category. You need to get it there…!
During the Spring, Fall, and Winter months and even early morning in the Summer months you can use the furnace BTU Output and temperature-rise above the return air temperature; multiply it by 1.08 & then divide that number into the Btu/hr Output to get a pretty good CFM airflow number. It is close enough to get it within the correct CFM Zone…
If your air flow is not correct you will be getting false superheat and sub-cooling readings.
There is virtually no-one checking airflow CFM before charging an air conditioner or heat pump system. This is very essential in order to accurately charge the system, therefore, I will provide the easiest way to get a record of the CFM on the system; you are checking to see if it falls within the 350 to 400 CFM, or in hot dry climates up to 450 CFM per ton category. You need to get it there…!
During the Spring, Fall, and Winter months and even early morning in the Summer months you can use the furnace BTU Output and temperature-rise above the return air temperature; multiply it by 1.08 & then divide that number into the Btu/hr Output to get a pretty good CFM airflow number. It is close enough to get it within the correct CFM Zone…
If your air flow is not correct you will be getting false superheat and sub-cooling readings.
C’mon guys, it’s time to start doing things close to the RIGHT Procedural WAY…!
Sir is there any room air measuring device available?
Is it good idea to measure the flow rate at the suction side of a blower? Kindly give some idea. On delivery side of the blower, I dont have much long pipe network for making accurate flow measurement.
I doubt any lender will give a discount because you have an efficient home. I would love to see those guidelines!😂