Manual J Calculation? - HVAC-Talk
2007年8月9日 · For load calculations they use the Manual J (either 7th edition or 8th edition (full or abridged). Thus you immediately have three different algorithms for “loads” being used by the industry. Unit sizing is covered in the ACCA Manual S procedures which uses values generated by Manual J as one of many parameters in the sizing equation.
Pitfalls of DIY CoolCalc Manual J calculation - HVAC-Talk
2018年11月13日 · Pitfalls of DIY CoolCalc Manual J calculation. I'm having a home built now for my primary residence, and am almost at the dried-in stage. I've had a couple of quotes for the HVAC system, but both have sized based more on experience and rule-of-thumb. I looked into online Manual J calculators and ended up using CoolCalc.
Thread: Questions Concerning Manual J Load Calculation For A ...
2014年11月18日 · Originally Posted by RSWAFFER. I am attempting to perform a Manual J Load Calculation on a 1989 Fleetwood Double Wide Home. The home is 27 x 48 = 1296 square feet. The Manual J, 7th Edition Whole House Load Calculation shows average air changes per hour 900-1500 ft...Winter 1.0 AC/HR.....Summer .5 AC/HR. Are these average air changes per hour ...
Help interpreting Manual J Calculation - HVAC-Talk
2010年6月9日 · Here also there was a big difference between the first manual J calc and the second. Initial cooling equipment total load was 24176 BTuh (2.4 ton req total capacity) and for the second calculation, the load was 15064 (1.5 ton req …
Thread: Should basement area and volume been included in the …
2015年4月20日 · I understand there are many inputs when using the Manuel J calculations, however, as a starting point I am trying to determine if we are correct in thinking that the basement area and volume should have been included in his original calculations. Thank you for your time and attention. Reply. 04-20-2015,02:08 PM #2.
Manual J and Manual S Calculations - HVAC-Talk
2016年2月9日 · For example a Manual J calculation can show that you need a 3 ton unit but a Manual S may indicate that based on the equipment performance data a 3.5 ton is more appropriate. Manufacturer info is always based on their equipment so mix matching equipment presents a serious problem.
Manual J calculation and CFM - HVAC-Talk
2020年10月9日 · My house is in Houston, TX. My understanding is that these results indicate a 4 ton A/C system. Is the CFM calculated (1,712 cfm) representative of a 4 ton system? I thought there was 400 cfm/ton. Does the CFM on a manual J …
How necessary is a Manual J load calculation? - HVAC-Talk
2018年9月30日 · Any time the sensible load is less than 20% of design load with high outdoor dew points or rainy days, even an under sized a/c will not maintain 50%RH in home. Adequate fresh air and moisture from the occupants amounts to 2,000=6,000 btus latent load with low/no sensible cooling loads.
Online Manual J load calculator - HVAC-Talk
2011年12月19日 · Online Manual J load calculator. After about two years I finally got my online Manual J load calculator finished. Its been a fun project so far & I hope someone can get some use out of it besides myself. I also plan to add some data for Canada in the near future. I'd appreciate any ideas or feedback from anyone.
Manual J CFM - HVAC-Talk
2018年7月1日 · Manual J doesn’t prescribe airflow, Manual S does. The sensible heat ratio of the house ( divide your sensible gain by your total gain) from your Manual J calc. If it’s above .85 the recommended airflow is 425 to 450 per ton depending on how the manufacturer lists air flow in their extended performance data. A SHR Below .8 350 is the target.