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Thremal Dissipation versus calculated BTU/hrs

APC UPS Data Center & Enterprise Solutions Forum

Schneider Electric support forum for our Data Center and Business Power UPS, UPS Accessories, Software, Services, and associated commercial products designed to share knowledge, installation, and configuration.

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TRC_Eng_apc
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Thremal Dissipation versus calculated BTU/hrs

This was originally posted on APC forums on 11/29/2010


Symmetra LX 8kVA - How is the Online Thermal Dissipation 4995.00 BTU/hr calaculated when @ 6400 Watts it is 21850 BTU/hr


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BillP
Administrator Administrator
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Re: Thremal Dissipation versus calculated BTU/hrs

This reply was originally posted by Matt on APC forums on 11/29/2010


Hi Dominick,

The Symmetra LX 8kVA chassis, when fully loaded at 6400W/8kVA has an online thermal dissipation of 3485BTU/hr. See [online specs|http://www.apc.com/products/resource/include/techspec_index.cfm?base_sku=SYA8K8P].

If the UPS is powering a 6400W load, then the 6400W is not escaping as thermal energy like a huge toaster oven -- it's doing work to drive the downstream electronics.

Any thermal dissipation is a result of the way the UPS produces its output, including any inefficiencies in its design. The 3485BTU/hr spec is for an 8kVA chassis with 3 power modules operating at 100% load (6400W / 8kVA) and already fully charged. If this same system is rapidly charging the batteries the thermal dissipation is 6472BTU/hr.

Those two values would be the "worst-case scenario" specs for normal online (charged) and online (actively re-charging) modes for that chassis. If you run the UPS at less than its maximum load capacity, the thermal dissipation would obviously be less.

See Answer In Context

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BillP
Administrator Administrator
Administrator
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92

Re: Thremal Dissipation versus calculated BTU/hrs

This reply was originally posted by Matt on APC forums on 11/29/2010


Hi Dominick,

The Symmetra LX 8kVA chassis, when fully loaded at 6400W/8kVA has an online thermal dissipation of 3485BTU/hr. See [online specs|http://www.apc.com/products/resource/include/techspec_index.cfm?base_sku=SYA8K8P].

If the UPS is powering a 6400W load, then the 6400W is not escaping as thermal energy like a huge toaster oven -- it's doing work to drive the downstream electronics.

Any thermal dissipation is a result of the way the UPS produces its output, including any inefficiencies in its design. The 3485BTU/hr spec is for an 8kVA chassis with 3 power modules operating at 100% load (6400W / 8kVA) and already fully charged. If this same system is rapidly charging the batteries the thermal dissipation is 6472BTU/hr.

Those two values would be the "worst-case scenario" specs for normal online (charged) and online (actively re-charging) modes for that chassis. If you run the UPS at less than its maximum load capacity, the thermal dissipation would obviously be less.