Tek-Tips is the largest IT community on the Internet today!

Members share and learn making Tek-Tips Forums the best source of peer-reviewed technical information on the Internet!

Register Log in
  • Congratulations TugboatEng on being selected by the Eng-Tips community for having the most helpful posts in the forums last week. Way to Go!

Search results for query: *

  • Users: DesM1
  • Order by date
  1. DesM1

    Evaparative condenser performance

    Yes, I know but thanks for mentioning this. The selection programme comes up as "optimal" for port selection and the manual states that this is what happens when the model has variable volume ratio control (ratios grayed out). I will double check it though.
  2. DesM1

    Evaparative condenser performance

    Thanks Yorkman. My basis problem is knowing how evaporative condensers perform at conditions (ie, web bulb temps and condensing temp/press) below that stated in the catelogues. All of the catelogues stop at 10*C wet bulb and 30*C condensing temp. The question is, for example, what Heat Rejection...
  3. DesM1

    Evaparative condenser performance

    To: 25362 Thanks for your very detailed reply. Yes, I take your point and you are absolutely correct. In this particular case though the compressors are all variable volume ratio control so a saving should accrue. But I am interested to discuss the case where they are not variable volume ratio...
  4. DesM1

    Evaparative condenser performance

    Thanks 25362 but I am curious as to why not. If I enter the two operating conditions into the compressor programme (eg, Sabroe) it gives me a different power requirement and COP. I would be very interested to know the basis of you comment.
  5. DesM1

    Evaparative condenser performance

    Thanks Yorkman. I realise that there is a minimum head pressure but that pressure is quite low, circa 15*C (6 bar.g) and is determined by such factors as defrost requirements, oil separator performance at the lower density, pipe capacity, etc. On pumped systems the expansion valve is not usually...
  6. DesM1

    Evaparative condenser performance

    Re: Evaporative condenser as used on ammonia refrigeration system. For a given condenser I am looking for a formula which gives the condensing temperature (Tc) for any given web bulb temperature (Twb). The manufacturer's brochures give the "Heat Rejection Factors" for different combinations of...
  7. DesM1

    Solving for Wetbulb Temperature with Excel thread770-144858

    Sorry, I am looking for wet bulb temp using inputs of dry bulb and humidity.
  8. DesM1

    Solving for Wetbulb Temperature with Excel thread770-144858

    I am trying to write a programme in Excel to provide the performance of refrigeration evaporative condensers for each hour of the year. This is necessary to predict savings (due to lowering the condensing pressure) for different sizes (and capital costs) of condenser. I came across thread...

Part and Inventory Search

Back
Top