effect of cooling water inlet temperature on the motor.

Naresh_20479
Naresh_20479 Altair Community Member
edited April 2021 in Community Q&A

Hi ..

I am simulating a water jacket cooled induction motor. I solved the simulation for two cases as steady state solution

case 1 : cooling water inlet temperature 30 degree Celsius.

             I this case the outlet water temperature is 31.4 degree Celsius.

             and the temperature at the area of interest (Stator) temperature is 55 degree Celsius.

case 2 : cooling water inlet temperature 40 degree Celsius.

             I this case the outlet water temperature is 41.4 degree Celsius.

            and the temperature at the area of interest (Stator) temperature is 65 degree Celsius.

 

and i observed the temperatures of all the components is 10 degree Celsius higher than in case 1.

To confirm this ,  tried a simple model - a heat generating sphere is kept in a flowing water pipe.In this case also for every 10 degree Celsius rise in temperature there is a 10 degree Celsius rise in heat generating ball.

So if cooling medium temperature is rised by X degree Celsius, all temperatures in the model  rises by X degree Celsius.Is it correct .

i personally believe it is not.Then why my simulations are saying that?

Please  guide me, this a very crucial.

Thanks in advance.

 

Note : I am using Acusolve 2021. Mesh is prepared in HM with AcuSolve profile. All solutions are well           converged.Steady state solution is assumed.

            All Material properties are constant(does not vary with temperature)

 

          

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Answers

  • acupro
    acupro
    Altair Employee
    edited April 2021

    Seems to make sense to me.  Temperature itself is a simple scalar transport system.

  • Naresh_20479
    Naresh_20479 Altair Community Member
    edited April 2021

    Hi..

     

    The specific heat of water is around 17 to 20 times higher than the specific heat of the component materials of the motor.Then how would the the change in water temperature and those metallic component's temperature be same?.

    Please bear with me and could some body help me ..or refer me any material or some thing..

  • acupro
    acupro
    Altair Employee
    edited April 2021

    The relative difference in the properties (Cp and k) between the water and metal has not changed.  The response is linear.  So when the load is increased by a certain amount, the response will also increase by that amount.  That is how I see it.

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