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  1. MEP.Learner

    Basic question - why are chilled water systems pressurised?

    the pipe pressure that u see is result of pump head (depends on the pipe hydraulic loss u need to overccome) and + static head With example above, 80m height building gives about 8 bar static pressure. + the operating pump pressure and some safety factor, u will get about about 10+ bar at the...
  2. MEP.Learner

    Evaporative cooler for indoor space - air psychrometric

    @trashcanman, thanks for the reply. Yes, we do know about the general guide that ID/DEC doesn't work in SEA. However from the trial setup shows that the feedback on thermal comfort is actually positive. At the moment, i am researching the problems that can arise from the elevated humidity...
  3. MEP.Learner

    Questions regarding System Effect

    hello, not sure if your question is as per the figure or just a general MV question. But for the figure 7 above, for blow thru "fan and coil arrangement", u can see the turbulence of air or the "velocity profile" of the air within the duct. If the min. distance is not complied, the cooling /...
  4. MEP.Learner

    Evaporative cooler for indoor space - air psychrometric

    Hi @LittleInch and @nuuvox000 Thanks for the reply. the pdhonline is good. I have spent fair bit of time looking thru youtube / online design guide / pdf studies on evaporative cooler. The system i will be using is IDEC+DEC. The area i am operating is south east asia, which the ambient RH is...
  5. MEP.Learner

    Evaporative cooler for indoor space - air psychrometric

    Hi Engineers, I have questions for evaporative cooler application to different indoor spaces (like factories, hospital, wards, offices, public spaces). We are looking to deploy a more sustainable way to cool indoor space (maybe due to certain area with less budget to install aircon, lower...
  6. MEP.Learner

    ASHRAE weather data for specific time

    hi engineers i do have the account for ASHRAE weather data. However i would like to know the frequency of occurence for different range of temperature (DB and WB) from certain time only (eg. from 8am to 7pm). Eg. like 20% - it is hottest at 38 deg C. 50% is medium at 32 deg C, etc.. I wish...
  7. MEP.Learner

    HAP software- generating data in certain time only

    let's just assume the peak heat load is designed and catered for. Or assumed that my question is to turn on aircon only from 1am to 6am, which is definitely the lowest heat load requirement.
  8. MEP.Learner

    HAP software- generating data in certain time only

    yes, i agreed that the system load / zone load can be generate at certain timing. That report will tell you how much heat from solar, conduction through window/ wall, lighting, elec and human load, etc. But my question is, how do i size my Airside equipment based on this info. Usually the...
  9. MEP.Learner

    HAP software- generating data in certain time only

    yes, or to see how is the performance of the system (which is sized based on peak load) on that low load condition..
  10. MEP.Learner

    HAP software- generating data in certain time only

    [highlight #FCAF3E][/highlight] Hi Engineers, For HAP Hourly analysis program, can anyone guide me how to generate the equipment sizing data for lets say from 2am to 5am which is off peak? As my case is a full glass building with very high sensible heat in the afternoon. (High peak total heat...
  11. MEP.Learner

    Oversized aircon cooling design and humidity issue

    hi Engineers, I have a project in tropical country, and issue that aircon probably oversized and have humidity issue (more than 70% RH obtained), with mold growing on walls observed. This may also due to hot humid air infiltration to the A/C space. Would like to ask for advice and opinion how...
  12. MEP.Learner

    Insufficient CHW water flow in existing pipe

    @LowDeltaTSolver Thanks. As this is rather old building with aged CHWP, the CHW water condition is rather bad with mud, debris, foreign matters. The strainer at the FCU was removed as they will choke in short period. The cooling coil however is verified still not clogged with the strainer...
  13. MEP.Learner

    Insufficient CHW water flow in existing pipe

    @LittleInch , @SAK9 Thanks for the input again. Due to the confidentiality of the project, I might not be able to share the diagram. But The CHW piping can be simplified / described as below: There is 3 main CHW loop from the Chilled plant room. Each of the main CHW loop furthest point is...
  14. MEP.Learner

    Insufficient CHW water flow in existing pipe

    @moideen partly replaced, partly still remained as existing. And all these other loops are working well. Delta T in my case is 6 deg C. This area with low CHW flow are replaced with the same FCUs as other area that CHW flow is just fine. (so the issue is not with the FCUs selection.) The real...
  15. MEP.Learner

    Insufficient CHW water flow in existing pipe

    Hi All, Thanks and appreciate for all the replies. @dbill74 yes the control valves are newly replaced. There are two ports for differential pressure measurement which can then be derived to get CHW flowrate thru the control valve, which also gives the flow thru the FCU and cooling coil (as the...
  16. MEP.Learner

    Insufficient CHW water flow in existing pipe

    Hi Engineers, I have a existing premise with Central Chilled water system, which is undergoing a major renovation / refurbishment work. There is a portion where only existing CHW FCUs replacement work is carried out. Then here comes our problem, after the replacement work it seems that we can’t...
  17. MEP.Learner

    Sprinkler design for shopping mall atrium space with high ceiling

    I believe FM global data sheet is referring to high pile racked storage protection? Which if we were to use K 25.2 sprinkler will be way over size? This will result in high flowrate pump, big storage tank size requirement.
  18. MEP.Learner

    Study of introducing pre cool fresh air system

    hi dbill74, Thank you for your reply. Thanks for the reference of ICC. May I know where do you practice engineering? Both items you mentioned, "It will save energy." and "allows your main coil to be smaller which i presume, maybe lower cost" i have heard that. But it is hard to grasp, energy...
  19. MEP.Learner

    Study of introducing pre cool fresh air system

    Hi Engineers, As title above. For tropical country, what is the justification to introduce pre cool air system to AC system. Besides better humidity control, what about in term of cost and energy aspect? What i understand is that with precool air system, the air side equipment cooling coil...
  20. MEP.Learner

    Sprinkler design for shopping mall atrium space with high ceiling

    Hi Engineers, I have a situation where there is a shopping mall atrium with 25m ceiling height, atrium diameter is about 30m diameter on plan view. So the question is what kind of sprinkler can be adopted for this atrium protection as in BS EN code mention that sprinkler more than 18m is not...

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