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NC-2009 EAp2:Minimum Energy Performance

ECS - Other clg Accessories under Primary Cooling

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Ivy Chen
Manager
Banyan Tree Hotels & Resorts
LEEDuser Basic Member
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We would like to find out what have been included in item "Other Clg Accessories" under Primary Cooling in Energy Consumption Summary. In our baseline, Package Terminal Heat Pump is adopted. The Energy Consumption Summary is generated. Just to test out how much more efficient VRV system will be compared to Package Terminal Heat Pump, we simple change the equipement type to VRF heat pump without changing anything else in the program. Again, the summary is generated. We were expecting there would be some engery saving but surprisely found out it was not the case. when zooming into details, we discovered that the Other clg Accessories under Primary Coolig increased significantly althought Cooling Compressor Load reduced. Can someone advice what is going on? Btw, we are using Trace 700 for the energy modeling. Thanks in advance.

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Marcus Sheffer
LEED Fellow
7group / Energy Opportunities
LEEDuser Expert
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Tue, 12/11/2012 - 13:53

You can usually find more detail in the Equipment Energy Consumption report that helps to breakdown the usage. Beyond that we do not use Trace but I would call Trace since you are already paying for their customer support or post your question on the Trace Users listserv at onebuilding.org
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Ivy Chen
Manager
Banyan Tree Hotels & Resorts
LEEDuser Basic Member
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Wed, 12/12/2012 - 03:15

Hi, Marcus Thanks for your reply. Yes, I sent the query to Trane helpdesk at the same time but only got a generic reply from them. Anyway, this moring I found the answer after printing out the equipment energy consumption as suggested by you. To share my finding here, Other Clg Accessories Load comprised of loads of Control Panel and interlock / Heat pump defrost cycle etc, which have been preset in the program. For example, the default value of VRV Control panel & interlocks is 0.5kw while Package Terminal unit is only 0.1kw. This results in the significant difference. Thank you.

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