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# What is the difference between SS-A and SV-A reports in eQuest?

I created two equest model, one is simple AHU system and the other is AHU system and OA from PAU (Primary Air Unit), the outside air pre-cooling by pass through PAU and then mix with RA finally cooling down by AHU.

I think the AHU cooling CAPACITY should be different, but the AHU cooling CAPACITY in SV-A is the same between the two models, and the AHU cooling CAPACITY in SS-A is reduced. I was so confused why cooling CAPACITY in SV-A does not change? What is the difference between SS-A and SV-A reports in eQuest?

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SS-A is the System Loads Summary: it gives you the monthly sum of energy for heating/cooling as well as the monthly peak for your system based on the weather file you have. It shows monthly cooling, heating and electrical loads. The loads shown are the sum of zone-level loads and central air-handling-unit loads

SV-A is the System Design Parameters: this report echoes your input to the program for each system as interpreted by the SYSTEMS design routines

Source: DOE22 Volume 4 Libraries, page 134 (140 of PDF) for SS-A and page 124 (130 of PDF) for SV-A

The fact that the values in SS-A would indeed be reduced makes sense, since this is the actual monthly heating/cooling loads, and you have some pre-cooling done at the Primary Air Unit level.

As far as why you're not seeing a difference in SV-A, I can't tell from the information you provided, it's unclear whether you're autosizing and what are your inputs to it. The fact that you're not seeing a difference means that the system parameters - either entered manually or computed by eQuest - are the same.

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I am sorry for my late response and so grateful for your reply.I have one more question, i create new project,the system type is VAV and set HRV ,other parameter all keep the default, Why i find the cooling capacity in SV-A is not change,but SS-A cooling load is difference? i through EQUEST will autosize system parameter to met cooling load in SS-A, I want to know the cooling capacity in AHU if i set HRV ,i think i set HRV i can get smaller AHU capacity...i am a beginner in EQUEST and want to learn this software.

( 2017-07-30 07:47:21 -0500 )edit