Jeremy Martin
23-04-2013, 02:50 AM
Good evening.
What are the efficiency benefits of a TXV over a piston for the residential and light commercial split systems that I work on (1.5 to 5 ton systems in the northeast US)?
I always run up the head pressure to check superheat on piston systems so I can make sure they won't flood back on hot days. Basically, I'm charging for the hottest week of the year.
So every day that it's cooler than the conditions I simulated, the system is undercharged. Ergo, a piston isn't doing a very efficient job of cooling at lower ambient temperatures.
Whereas: A TXV will maintain a nice 10 or 12 degree superheat, give or take, under all reasonable conditions.
Isn't the compressor going to run a lot less at lower outdoor temps with a TXV? And if that is the case, won't a TXV pay itself off pretty quickly? And if THAT is the case, why isn't everybody selling systems with TXVs? Am I missing something here?
Thanks.
What are the efficiency benefits of a TXV over a piston for the residential and light commercial split systems that I work on (1.5 to 5 ton systems in the northeast US)?
I always run up the head pressure to check superheat on piston systems so I can make sure they won't flood back on hot days. Basically, I'm charging for the hottest week of the year.
So every day that it's cooler than the conditions I simulated, the system is undercharged. Ergo, a piston isn't doing a very efficient job of cooling at lower ambient temperatures.
Whereas: A TXV will maintain a nice 10 or 12 degree superheat, give or take, under all reasonable conditions.
Isn't the compressor going to run a lot less at lower outdoor temps with a TXV? And if that is the case, won't a TXV pay itself off pretty quickly? And if THAT is the case, why isn't everybody selling systems with TXVs? Am I missing something here?
Thanks.