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  • Users: vij36
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  1. vij36

    Failing chilled water pipe insulation

    We had a situation once we were considering hdpe pipes instead of MS. But that idea has been dropped. Still wondering polyethylene ... is it a choice for CHW piping?
  2. vij36

    Circulation pump head calculation in a pressurized closed loop

    sorry, i did see this is already discussed in below thread in september Link So the static head is zero in a closed system. And only friction losses and coil losses to be considered. We are storing the chilled water in tanks which are about 15 meters lower level than chiller. What would be...
  3. vij36

    Circulation pump head calculation in a pressurized closed loop

    Dear Sirs, Calculating a circulation pump head in a pressurized closed loop for the below scenario. Attached a simple schematic. A booster having more head (up to 6 bar) and low volume flow, pressurizes a tank and maintains the pressure in the closed loop, supply and return. Circulation pump...
  4. vij36

    hdpe chilled water pipe insulation thickness

    Hi, We are using hdpe pipes for chilled water. When i tried to use 3Eplus Naima software for calculating insulation, there is no option available for HDPE. There are 4 options for "Base metal" Stainless Steel, Steel, Copper, PVC. How to proceed further , please let me know. I would like to...
  5. vij36

    PNG burners replacement with Induction stoves

    Dear Sirs, any advice please ... Please vet this approach below >> A T78 burner specs: Length 100 mm, dia 117 mm, working pressure 4.5 psig, gas consumption 3/550 kg/hr, rated heat output 40,250 kcal, inlet 3/8 inch. So if i equate this 40,250 kcal to kW then it comes to 46.82 kW. A PNG...
  6. vij36

    PNG burners replacement with Induction stoves

    Hi All, We are planning to replace PNG fired burners with induction stoves. Some burners of type T70. What is the criteria for one to one replacement of a PNG fired burner with an induction stove ? Do i need to find the BTU output of T70 burner and then equate that BTU to an induction stove...
  7. vij36

    induction stove efficiency

    understood ... back to basics with the help of the members here .. thank you all
  8. vij36

    induction stove efficiency

    In the midst of this discussion i got this fundamental doubt ... in the kcal calculation "time" factor is considered (m*c*dt/ Time). But in kW calculation i.e. V*I*(3)^.5*Cos(Phi) same "time" factor is missing. How does the this "time" factor embedded and hidden in the kW calculation ? How...
  9. vij36

    induction stove efficiency

    yes i have made a mistake in the calculation. Inquired the vendor and got to know PF is 0.92. Now the efficiency comes up to 60%. So where the remaining power converted ? Is it dissipated to atmosphere ? Asked vendor to give us test certificate or any calculation for the efficiency. Please...
  10. vij36

    induction stove efficiency

    I am unable to see the link the attached file.
  11. vij36

    induction stove efficiency

    Hi , Bit confused with a simple calculation. Recently done an induction stove testing. It is an 12 kW induction stove. Have set it to 10 kW. heats 30 liters of water from 28 degree celsius to 90 degree celsius in 25 minutes. Wanted to calculate the system efficiency. Q = 30 kg * 4184 J/kg·K...
  12. vij36

    SS tank conductive heat loss

    Dear Sir, @IRstuff grateful for your reply. Apologies for my oversightedness. With your reply as the base now I am working on to find a an effective insulation also with less k value. There are some other calculation showing per sqft 4 w as the heat transfer. Then the total transfer is coming...
  13. vij36

    SS tank conductive heat loss

    Thank you every one for the help. Will go through all the inputs and will come back with right amount of thickness of insulation and type
  14. vij36

    SS tank conductive heat loss

    Dear All, I would like to calculate heat loss of hot water stored in an SS 304 tank Water temperature 90 C Dia of tank 2100 mm Height 3100 shell Thickness 5 mm rockwool insulation 100 mm K 0.036 W/m-k SS 304 K value 16.2 W/m-k (this is at 100 C. I don't know K value at 90 C) combined K 0.036...
  15. vij36

    Water softener basics

    Have consulted some big sized apartments. Finally resorted to this solution. Brine will be thoroughly mixed with this agitator and 100% concentration is ensured. Thanks,https://files.engineering.com/getfile.aspx?folder=16d33a70-2b7f-4aa7-8d73-23d7d1206ff5&file=Brine_agitator.jpg
  16. vij36

    Water softener basics

    Dear Sirs, I have a basic query. Though searched in web and talking to many professionals, I do have some doubts. It's all about regeneration process. One case study: raw water hardness 375 ppm Target hardness 100 ppm (user requirement) inflow 200,000 liters Resin capacity...
  17. vij36

    Softener under performing

    Dear Sirs, Covid created havoc upon our lives and there is a long delay. The Softener does not showing any mercy in terms of its efficiency. In a separate thread below 2 days back I have verified the brine tank and brine quantity also. Brine tank capacity I do have another query regarding...
  18. vij36

    Salt absorption capacity of water in softening process

    Dear Sirs, I would like to know the sizing of brine tank for a 900 liter resin softener. Resin capacity 900 liters Water hardness 250 ppm Salt exchange capacity 55 With this system 200,000 liters can be softened. (correct me if iam wrong) (900*55*1000/255 gives 200,000 liters) Salt required is...
  19. vij36

    Hot air ducting with in-line axial fans

    Dear Sirs, Unfortunately i am not having suficient expertise to implement Gholam Baghery's advice. I apologise. The radiator fan is engine mounted and belt driven. Radiator fan (4 ft x 4 ft) cross sectional area is 1.5 sqm. . The Kohler customer care on DG sets is not responding to my calls to...
  20. vij36

    Hot air ducting with in-line axial fans

    Dear Sirs, Thank you all for the kind advices. Have Attached a rough schematic of generator layout. Apologies for such a sub-par schematic. You could see a sea green color box beside the pink vertical columns which is the generator with green doors. Two pink colored circles are the planned...

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