Ammonia heat pump

[mad fridgie]

Not sure what can be said here but I manufacture high temp heat pumps,
85C, eCOP of up to 8. At present primary use is for dairy farms, connects to nominal 6-20Hp medium temp (off the shelf product) (not NH3),

[US Iceman]

85C, eCOP of up to 8. At present primary use is for dairy farms, connects to nominal 6-20Hp medium temp (off the shelf product) (not NH3),

I have done something similar to this also for a client. Did you have any problems with relief valve seats leaking after a few months?

[mad fridgie]

I have done something similar to this also for a client. Did you have any problems with relief valve seats leaking after a few months?

Had no field problems, however during RD stage, pushed the equipment somewhat harder than you should, internal pressure relief blew (reset after off period) caused both by straight pressure differential and hydrolic pulsation. (Had been to copeland seminar, they pushed the virtue of scroll liquid pumping, (from stop to start) so I decided to to give the compressor a liquid nudge when running, does not like it.) Added a Acc, just to be on the safe side.

[US Iceman]

I heard about some issues with the Teflon creeping out of the seat and ended up using a metal seated relief valve. May have been a fluke or the contractor may have done one thing and told me something else. Not that that would happen mind you.

Trane went through a similar experience on their scroll compressors also. They re-invented their piping manual for scroll compressors. Funny thing, if you followed their directions the compressors scrambled.

[desA]

Trane went through a similar experience on their scroll compressors also. They re-invented their piping manual for scroll compressors. Funny thing, if you followed their directions the compressors scrambled.

Hi US Iceman,

Can you perhaps be a little more specific on the problems Trane encountered?

Many thanks...

[US Iceman]

Hi US Iceman,

Can you perhaps be a little more specific on the problems Trane encountered?

Many thanks...

Sorry, did not mean to take this thread off-track. They had some oil return issues from what I remember. The company I worked for at the time had a lot of issues with this. Trane said to follow their piping manual and when we did problems resulted. When we pipe it the way we should have (eerily similar to the old Trane manual), no problems.

There were several big and loud discussions that took place at the time.