Phil is correct. In a closed loop system, after all air is removed, then the system is neutral too pressure other than the internal resistance to the piping and pipe fittings, provided that the the system remains in balance.
Only if the balance(weight) of the fluid in piping changes would you incur a pressure differential between suction and discharge.
On a liquid to liquid heat exchanger, the highest efficiency is obtained on a closed loop system.
On a closed loop system, "any" entrained air with-in the closed loop fluid would be less efficient. This is because liquid retains and transfers more BTU than air does. 2nd) we loose pumping efficiency because air will cause the pump to cavitate thus moving less gpm of desired BTU content and will shorten the pump life span.
The efficiency of a liquid heat exchanger is expressed in BTU/hr of heat transfer for amount of exchanger square feet at a given rate of flow.
Example: We have a liquid/liquid exchanger rated at 25000btu/hr@7gpm@60º∆. If we turn the flow rate upto 10gpm we would still only get approx 25000btu/hr of heat transfer.
I designed a fuel cooling station for rocket fuel using a MaQuay liquid/liquid flat plate heat exchanger that produced 25tons of refrigerating effect with a 8"x8"16" size exchanger. That was a smoking design performance for that era and still may be (very doubtful).
T_Bone<---45yrs ASHREA HVAC&R Design Engineer, Indoor Air Quality Engineer, Energy Management Engineer, AWS-CWI, Retired, Ranked in the top 60 of 150,000 of my peers, designing & troubleshooting multi-million dollar control systems.
We sell tractor parts! We have the parts you need to repair your tractor - the right parts. Our low prices and years of research make us your best choice when you need parts. Shop Online Today. [ About Us ]
Today's Featured Article - Earthmaster Project Progress Just a little update on my Earthmaster......it's back from the dead! I pulled the head, and soaked the stuck valves with mystery oil overnight, re-installed the head, and bingo, the compression returned. But alas, my carb foiled me again, it would fire a second then flood out. After numerous dead ends for a replacement carb, I went to work fixing mine.I soldered new floats on the float arm, they came from an old motorcycle carb, replaced the packing on the throttle shaft with o-rings, cut new ga
... [Read Article]
Latest Ad:
1964 I-H 140 tractor with cultivators and sidedresser. Starts and runs good. Asking 2650. CALL RON AT 502-319-1952
[More Ads]
All Rights Reserved. Reproduction of any part of this website, including design and content, without written permission is strictly prohibited. Trade Marks and Trade Names contained and used in this Website are those of others, and are used in this Website in a descriptive sense to refer to the products of others. Use of this Web site constitutes acceptance of our User Agreement and Privacy Policy
TRADEMARK DISCLAIMER: Tradenames and Trademarks referred to within Yesterday's Tractor Co. products and within the Yesterday's Tractor Co. websites are the property of their respective trademark holders. None of these trademark holders are affiliated with Yesterday's Tractor Co., our products, or our website nor are we sponsored by them. John Deere and its logos are the registered trademarks of the John Deere Corporation. Agco, Agco Allis, White, Massey Ferguson and their logos are the registered trademarks of AGCO Corporation. Case, Case-IH, Farmall, International Harvester, New Holland and their logos are registered trademarks of CNH Global N.V.
