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cooling towers are quite massive by default, if your plant have space issues, calculations should be done well in advance. other than that, as someone mentioned, return on investment should be really on good side, knowing water bills are quite high anywhere. distance is not an issue, you are designing water network and come to pumps you need. other than space, noise can be an issue in general, but for industrial plant that would likely not be a problem.
Originally Posted by GT Jets Still not seeing the 1700.. I believe I am missing something... First off a "tonne" is an odd choice of unit of measure (used for burning of petroleum to generate power). Here is a basic BTUH calculation equation. BTUH= GPM x Delta T (F) x 500 There are 12,000 BTU's in one ton of refrigeration. Let me know where I am going wrong. Regardless, cooling towers would be the best option budget wise, fluid coolers would be the ultimate. GT Yes youre right!! how embarrassing! I will total all units and re-check the tonnage. I think I mixed up jobs! assuming I am wrong (which I think I am) cooling tower seems the way to go?
Originally Posted by KickedGinger Im using Comfort Aire spec. With 1700 tonnes of cooling when the water is @ 70F the units use 1.35 GPM/ per tonne. 1.35GPM x 1700 tonnes = 2295 GPM You were right to correct me on the GPM. The units use 3 GPM @ and inlet temperature of 85F However 2295 GPM is still a heck of alot of water. Thanks again for your help. Keep in mind this is a fairly large plant with 45 -50 units. Is it even possible to run the supply and return lines that far? I suppose I would just increase the size of the pumps? Still not seeing the 1700.. I believe I am missing something... First off a "tonne" is an odd choice of unit of measure (used for burning of petroleum to generate power). Here is a basic BTUH calculation equation. BTUH= GPM x Delta T (F) x 500 There are 12,000 BTU's in one ton of refrigeration. Let me know where I am going wrong. Regardless, cooling towers would be the best option budget wise, fluid coolers would be the ultimate. GT
Originally Posted by GT Jets If it were mine, without seeing this set up, I would install a couple small cooling towers. Your math is whack.. I come up with 1000 GPM at a worse case scenario of 12*F temp split and 500 tons of cooling. This would equate to a worst case of two 250 towers... (These are itty bitty).... Double check your math against an equipment list and get back to this thread... I'm thinking this job scope would have a stupid fast return on investment. GT Im using Comfort Aire spec. With 1700 tonnes of cooling when the water is @ 70F the units use 1.35 GPM/ per tonne. 1.35GPM x 1700 tonnes = 2295 GPM You were right to correct me on the GPM. The units use 3 GPM @ and inlet temperature of 85F However 2295 GPM is still a heck of alot of water. Thanks again for your help. Keep in mind this is a fairly large plant with 45 -50 units. Is it even possible to run the supply and return lines that far? I suppose I would just increase the size of the pumps?
If it were mine, without seeing this set up, I would install a couple small cooling towers. Your math is whack.. I come up with 1000 GPM at a worse case scenario of 12*F temp split and 500 tons of cooling. This would equate to a worst case of two 250 towers... (These are itty bitty).... Double check your math against an equipment list and get back to this thread... I'm thinking this job scope would have a stupid fast return on investment. GT
45-50 units mostly 10 tons that's 500 tons in my mind where are you getting 1700 tonnes? I may be wrong but it's either tons or Kw's not tonnes.
Yep sounds like a pump and dump system to me . Originally Posted by jtrammel Ontario doesn't get below 70F in winter? Cooling towers is my vote. You're using waste water now?
Someone asked why I thought a cooling tower was the wrong choice. I have very little experience with these so correct me if I am wrong. Wouldnt a cooling tower have to be MASSIVE to reduce the water temperature from 100F to 70F (I would prefer 60-65 however someone else had mentioned that 65F was to cold) especially at 1700 tonnes of cooling inside the plant?
Originally Posted by Tommy knocker Cooling tower!! Don't need 60-65 water. Optimal temperature for water cooled units is 65F inlet (as per Comfort-Aire specs)
Originally Posted by jtrammel Ontario doesn't get below 70F in winter? Cooling towers is my vote. You're using waste water now? The temperature in the plant does not go below 70F in the winter. Right now they are using city water. Very expensive!
Originally Posted by Drazen hi, ginger, i assume you mistakenly changed what you specify as inlet and outlet, cooling tower should lower temperature, not raise it. your case seems to be typical case which actually calls for cooling towers. condensing temperature on chiller side should be as low as possible, that will only increase chiller efficiency. could you be specific on what do you think is a problem with that? I was referring to the inlet and outlet temps of the A/C units.
Cooling tower and acid clean the condenser bundles..
Ontario doesn't get below 70F in winter? Cooling towers is my vote. You're using waste water now?
hi, ginger, i assume you mistakenly changed what you specify as inlet and outlet, cooling tower should lower temperature, not raise it. your case seems to be typical case which actually calls for cooling towers. condensing temperature on chiller side should be as low as possible, that will only increase chiller efficiency. could you be specific on what do you think is a problem with that?
Cooling tower!! Don't need 60-65 water.
Questions regarding water cooled A/C and high water bills Hi there! I want your recommendation on reducing a water bill at a factory I service. They currently have 45-50 water cooled units totaling approximately 1700 tonnes of cooling. In the summer the equipment runs almost 24/7 I have done done some preliminary figures and estimate they use 5000 GPM!!!!!!!!! Most units are Comfort-Aire M# WPC-120-5 and WPC-60-5 (10 tonne 575 V) and (5 tonne 575 V) Switching the units to air cooled is NOT an option. Temperatures in the plant range from 70F in the winter to 120F in the summer. I maintain and check the water regulating valves each spring and like to set them for 100F condensing. I am not against pricing out a closed loop system but I don't have alot of experience in that area. I dont think a cooling tower alone would work because I would like to aim for 60-65F inlet and will have 90-110F outlet. IDEAS???? Any information or help would be appreciated. I work in south eastern Ontario to give you an idea of weather conditions.
Questions regarding water cooled A/C and high water bills
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