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  1. Thermo01

    Open tank or buffer vessel

    Is there a reason why in process cooling, open tanks (sometimes with Weir plates) tend to be used rather than a low loss header or buffer vessel? We have a site where we have been asked to combine 3 separate chilled water systems into one (2 x 40kw and 1 x 60kw chiller). All 3 systems have...
  2. Thermo01

    pressure at the bottom of a tank

    Hi Guys, Sorry for the late reply on this. It does look to be a gauge issue. I connected a digital gauge and I got a reading of 0.29 bar, which is how I understood it should be. My colleague had tried several analog gauges and they all showed 0.1 bar. Thanks for all of your help and...
  3. Thermo01

    pressure at the bottom of a tank

    How if the water is 3m in the tank?
  4. Thermo01

    pressure at the bottom of a tank

    TiCl4 - I can only assume that he was describing pressure differential although that isn't the question that I asked him. I will speak with him tomorrow. It looks like the gauge may well be the problem but we have tried 3 brand new gauges and all of them only rise to 0.1 bar. LittleInch -...
  5. Thermo01

    pressure at the bottom of a tank

    We've tried it with several gauges and they all ready the same. I spoke with a colleague who explained that the reading should be 0 Bar. He used the analogy of a hose pipe bent in a 'U' shape. If it was filled up then the pressure would be 0 bar because the pressure on the left hand side of...
  6. Thermo01

    pressure at the bottom of a tank

    Hi LittleInch, I've attached a quick sketch of our setup, Hopefully, this makes things a bit clearer. I haven't included the secondary legs on the sketch because they aren't part of my question. To be clear, This system has been running for several years. Our works have consisted of removing...
  7. Thermo01

    pressure at the bottom of a tank

    Hi guys, I'm sure this is a really simple question for you guys but it's one that has me stumped. We have a chilled water system with an open tank. The tank is about 4m high and is filled with water about 3m high. The primary pump that's connected to the chiller draws water out of the bottom...
  8. Thermo01

    Calculation KW ouput from a chilled water unit

    LittleInch.....Yep, you guessed it. I'd inputted the valve into the meter as one size smaller meaning the Kvs value was 48, when it should have been 82.6, obviously this had an effect on the flow rate. using the correct flow rate now means that both duties are within 10%. With the cooling...
  9. Thermo01

    Calculation KW ouput from a chilled water unit

    Energy professional, that's a good point, I was only measuring sensible. I suppose I should have used enthalpy DT for total cooling load but these units are high sensible cooling units and have a high SHC of 0.97 or so. Interested to hear more about that program.
  10. Thermo01

    Calculation KW ouput from a chilled water unit

    I know, it would be better with a balometer but I've used the vane anenometer in the past and the figures are usually similar. The vane anemometer has an option to use mean, making it a bit more accurate imo. My digital manometer has the Kvs values stored for various valves, I input the valve...
  11. Thermo01

    Calculation KW ouput from a chilled water unit

    Hi, Yes, sorry I missed the density off due to it being 1 or 1.02Kj/Kg and due to the fact it doesn't really change the outcome. This unit is inside the building and recirculates the room air, no fresh air at all, Just a bunch of servers. I measured the airflow using a vane anemometer...
  12. Thermo01

    Calculation KW ouput from a chilled water unit

    Hi there, I'm looking for some help on calculating the duty of a chilled water computer room air handler I've taken some readings (from calibrated equipment)on both the water and the air side and calculated the duty from these figures but the figures are no where near the same. Air on 29'C...

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