Quote:
Originally Posted by BigJon3475
I'm not sure I understand what you want me to explain. Do you not understand the above because those are the calculations I've repeatedly brought up. Using IEER and claiming that the document is not used to rate air cooled equipment is disingenuous and simply a deflection. They're right there starting on page 90 in nauseating detail.
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First off you have to understand what AHRI does. They work in a lab under lab conditions in a concise environment to rate matched air conditioning equipment.
Assuming that you work on air conditioning in the field, how often do you come across properly matched equipment... of the same name brand that you can obtain an ARI/AHRI number? If you can't get an ARI / AHRI number then how could you get an estimation of energy efficiency if you wanted one? Is the temperature always the same indoor and out? Realizing there are many times multiple ways to do things. Out in the field it is estimation, because operation is in a random environment that a lab is not under. The goal here is to get an idea... if you're off by a few dollars or few tenths of points in SEER rating it won't matter much under the next heat wave that hits.
The article you posted is easily taken out of context, which is clearly what you point out in your last post of not knowing what to explain to me. If you look to the last picture I posted it clearly shows that AHRI only publishes the information that you see listed in that last picture I posted, this is what I take from it. This is the info you have to go by, because there is no other... this is how the equipment is rated. You can't glean something from information that isn't published. They state this on page 2 of the document to try to save you from yourself, which was the first picture I posted. These people that write this stuff are mechanical engineers, and the words they use can very easily be taken out of context.
My goal being an HVAC contractor is to make it easy for anyone to understand. It doesn't have to be that hard. The proof is in the light bill. The efficiency number really doesn't matter after the fact unless you are faced with a high light bill... it's just a rating that tells you where you are in the spectrum of potential AC operating costs.
I tell you what, let me know if you are in an area with design temp of 95 out door ambient and 75 degree indoor temp and the following information:
1: The average cost you pay for electricity per KWH. (cents per kilowatt)
2: How many HVAC units you have and the tonnage of those units.
3: The temperature at which the units are run. (average temp... I know this will fluctuate)
4: Do you have gas heat or electric heat?
5: Your highest summer electric bill... the total cost including service charges.
6: Your lowest winter or spring electric bill... the total cost including service charges.
7: General location of where you live... like nearest city.
8. Do you have a pool pump or anything else that runs in the summer, but off in the winter?
9: If you are on average billing just give me total cost including service charges per month and tell me you are on avg. billing.
DO NOT tell me the SEER rating of your HVAC systems.
I will tell you what your SEER rating is based on your own usage. Just realize that the further away from design temp that you set your thermostat the rating will be skewed one way or the other. The rating serves as your own personal rating for how you run the equipment.
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