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hi:cooling:cooling:blmrackcooling [2023/02/01 15:26] p.boutachkov |
hi:cooling:cooling:blmrackcooling [2023/02/01 15:31] p.boutachkov |
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The period of oscillation changes. It is most likely related to outside temperature. | The period of oscillation changes. It is most likely related to outside temperature. | ||
* Switched the Tek MSO44 scope. The temperature in the rack is __28.3 C__ but there are no more oscillation. Seems the AC is ON all the time | * Switched the Tek MSO44 scope. The temperature in the rack is __28.3 C__ but there are no more oscillation. Seems the AC is ON all the time | ||
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* Removed the paper " | * Removed the paper " | ||
* Removed the HV main frame, the temperature dropped from __31 C__ to __26 C __ | * Removed the HV main frame, the temperature dropped from __31 C__ to __26 C __ | ||
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* Installed the HV under the scope, above the DAQ. Turned it on. The temperature stabilized at __31.5 C __. | * Installed the HV under the scope, above the DAQ. Turned it on. The temperature stabilized at __31.5 C __. | ||
* There is a possibility to measure the HVCardsTemperature. The temperature is __ 30 C__ | * There is a possibility to measure the HVCardsTemperature. The temperature is __ 30 C__ | ||
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* Installed the HV under the DAQ in place of the NIM bin. The temperature stabilized at __ 29.5 C__. The HV card temperature is __ 29 C__. | * Installed the HV under the DAQ in place of the NIM bin. The temperature stabilized at __ 29.5 C__. The HV card temperature is __ 29 C__. | ||
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* Installed the NIM bin above the HV and the DAQ above the NIM bin. everything is on now. The temperature stabilized at __ 29.1 C __. | * Installed the NIM bin above the HV and the DAQ above the NIM bin. everything is on now. The temperature stabilized at __ 29.1 C __. | ||
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The temperature was the same for both sensors. Hence there is sufficient air mixing. | The temperature was the same for both sensors. Hence there is sufficient air mixing. | ||
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The outside temperature is __ 23 C__. | The outside temperature is __ 23 C__. | ||
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* The cooling power needed to control the temperature in the rack is of order of 1700 W. I expect to add 4 more units, 2 LED drivers and 2 switching matrices. The will add of order of 40 W. Hence, I use 1750 W for the estimates | * The cooling power needed to control the temperature in the rack is of order of 1700 W. I expect to add 4 more units, 2 LED drivers and 2 switching matrices. The will add of order of 40 W. Hence, I use 1750 W for the estimates | ||
* A DEK15 unit operating in __ 35 C __ hall temperature will stabilize the rack temperature at around __ 40 C __. | * A DEK15 unit operating in __ 35 C __ hall temperature will stabilize the rack temperature at around __ 40 C __. | ||
- | * A DEK20 unit operating in __ 35 C __ hall temperature will stabilize the rack temperature at around __ 30 C __. | + | * A DEK20 unit operating in __ 35 C __ hall temperature will stabilize the rack temperature at around __ 30 C __. (Note: this is a drop in replacement of DEK15, it adds 6 kg to the roof load) |
- | * A DEK30 unit can keep the rack temperature bellow __ 20 C __ even in __ 35 C __ hall. | + | * A DEK30 unit can keep the rack temperature bellow __ 20 C __ even in __ 35 C __ hall. |