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  • Users: rQb
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  1. rQb

    CO2 Air to Water Heat Pump w Solar Pre-heat

    Hi, Does anyone have experience with CO2 heat pumps and the use of solar pre-heat feed to the heat pumps? I'm being advised that solar pre-heat is not preferred as a larger delta T is better. If above 35DEG C pre-heat performance drops? New to heat pumps and have not been able to easily find...
  2. rQb

    Gravity flow through 500 micron basket.

    Thanks all. Think a physical test best option.
  3. rQb

    Gravity flow through 500 micron basket.

    Hi, I need to calculate what flow rate is possible to achieve through a 500 micron mesh basket. Gravity scenario as Basket will be located in a floor drain. I imagine head over the outlet and surface area opening of the basket but not sure which formula to use. Thanks in advance K
  4. rQb

    Anchor Point Calculation - High Rise Pipe

    Hi, I was hoping someone may be able to direct me to a good reference for calculating anchor point loads for vertical water service piping (high rise installation). Thanks in advance K
  5. rQb

    Weymouth Formula Example

    Hi, Have located a metric version of the Weymouth formula in ASPE Data Book Volume 2 (screenshot attached). I am a bit confused about the results I am getting however. If I enter the following data: D = 98.34mm L = 300m P1 = 70kPa P2 = 50kPa S = 0.6 I get 12067601.01 which the formula...
  6. rQb

    Gas Pipe Sizing Formula

    Thank you for your assistance. For reference should anyone come across this post, with regards to diversity, I found two references. a) International Mechanical Code 1988 http://publicecodes.cyberregs.com/icod/imc/1998/icod_imc_1998_13_par017.htm and b) ASPE Data Book Volume 2, Figure 7-5...
  7. rQb

    Gas Pipe Sizing Formula

    Hi, I'm chasing a couple of things to assist with design of a gas service for a high rise apartment building. a) The most suitable formula to use in sizing the pipework. System would be 100 mm and supply pressures 2.75 kPa thru to 70 kPa. b) As I understand it equivalent lengths are typically...

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