[Dsg-rich] MVT exhaust fan in EEL 124

[Valery Kubarovsky]

Hi George, 
Thank you for looking to all these issues. I agree that we have to determine the exact location of these fans in the Hall-B and determine the change in the length of the exhaust tubes. 

And sure we will test the exhaust line pressure when the fans will be on and off. 

In any case the cRio interlock will monitor the temperature inside the electronic panel and will shut down the detecter in case of accident with exhaust fans. 

Thank you again, 
Valery 

> From: "George Jacobs" <jacobsg at jlab.org>
> To: "Valery Kubarovsky" <vpk at jlab.org>
> Cc: "Tyler Lemon" <tlemon at jlab.org>, "dsg-rich" <dsg-rich at jlab.org>
> Sent: Tuesday, October 17, 2017 5:31:52 PM
> Subject: Re: [Dsg-rich] MVT exhaust fan in EEL 124

> Hi Valery,

> Have you taken into account the length of the hose or tubing that must be added
> in order to attach the fan to the detector? If the overall line length must be
> doubled or tripled to reach the fan, the flow restriction from the tubing will
> also double or triple.

> If the fan stops running, the fan blades will restrict the gas flow at some
> level. Flowing gas has velocity and momentum, fan blades will require the gas
> change direction, loosing momentum and velocity.

> So, there will be additional flow restriction and it will increase the cooling
> air pressure in the electronics box in the case of fan failure. The added
> restriction due to the additional lengths of tubing or hose can be calculated.
> The additional restriction created by the fan blades can be physically tested
> by turning off the fan and monitoring the change in the exhaust line pressure.

> George

> On 10/17/2017 4:27 PM, Valery Kubarovsky wrote:

>> George,

>> First we want to test it at the cleaning room to measure the effectiveness of
>> these fans.
>> And later on we will use it in the hall.

>> The design of the cooling system was done without exhaust fans. In case of the
>> power failure nothing will happen with the pressure system. The fan has much
>> bigger diameter than our tubes and by this reason will not block the air flow.
>> It is completely open.

>> Regards,
>> Valery

>>> From: "George Jacobs" <jacobsg at jlab.org>
>>> To: "Tyler Lemon" <tlemon at jlab.org> , "dsg-rich" <dsg-rich at jlab.org>
>>> Sent: Tuesday, October 17, 2017 1:20:12 PM
>>> Subject: Re: [Dsg-rich] MVT exhaust fan in EEL 124

>>> Would this setup be used only in the clean room for testing or would this be for
>>> use in the hall during normal operations?

>>> If the answer is the latter, what would happen to air cooling flow and pressure
>>> if the power to the fans tripped off during a run?

>>> George

>>> On 10/17/2017 11:56 AM, Tyler Lemon wrote:

>>>> Hello Valery,

>>>> Attached is the photo of the MVT exhaust fan in use in EEL 124.

>>>> Would there be a possibility that RICH would use similar fans to pull out the
>>>> hot air from the electronic panel?

>>>> Best regards,
>>>> Tyler

>>>> _______________________________________________
>>>> Dsg-rich mailing list Dsg-rich at jlab.org
>>>> https://mailman.jlab.org/mailman/listinfo/dsg-rich

>>> --
>>> George Jacobs
>>> Jefferson Lab (TJNAF)
>>> STE 12
>>> 12000 Jefferson Ave.
>>> Newport News, VA 23606

>>> (office) 757-269-7115

>>> (cell)   757-876-0480

>>> (email) jacobsg at jlab.org (website) https://userweb.jlab.org/~jacobsg

>>> _______________________________________________
>>> Dsg-rich mailing list
>>> Dsg-rich at jlab.org
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> --
> George Jacobs
> Jefferson Lab (TJNAF)
> STE 12
> 12000 Jefferson Ave.
> Newport News, VA 23606

> (office) 757-269-7115

> (cell)   757-876-0480

> (email) jacobsg at jlab.org (website) https://userweb.jlab.org/~jacobsg
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