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Re: [EnergyPlus_Support] DX Cooling coil single speed


Sandip,
Have you reported Output:Variables such as:
* Output:Variable,*,Cooling Coil Electric Power,hourly; !- HVAC Average [W]
* Output:Variable,*,Cooling Coil Sensible Cooling Rate,hourly; !- HVAC Average [W]
Another consideration is to create Meter:Custom for specific variables.
These may make your evaluation simpler than using manual calculations.
 
On Tue, Jul 5, 2016 at 4:32 PM, sandip gupta <mailto:sandipgupta_nh@xxxxxxxxxxx>sandipgupta_nh@xxxxxxxxxxx [EnergyPlus_Support] <<mailto:EnergyPlus_Support@xxxxxxxxxxxxxxx>EnergyPlus_Support@xxxxxxxxxxxxxxx> wrote:
>  
Dear Sir,
> 
> Thank you for your kind reply.
> My main aim is to find the relation between Power consumption by HVAC system for a given desired room temperature and outdoor room temperature.I have already used the performance curve to get the power consumption using
> Q.total=Q.total.rated*EIR*RTF
> 
> Where RTF=PLR/PLF
> and PLR=actual sensible cooling load /steady state sensible cooling rate
> 
> What is the formula to calculate actual sensible cooling load and steady state sensible cooling rate where can I find this values is reporting XLS sheet.
> How actual sensible cooling load and steady state sensible cooling rate are related to Desired Set Point Temperature and and Outdoor temperature.
> 
> With Regards,
> Sandip Gupta
> 
> 
> --------------------------------------------
> On Wed, 6/7/16, Jean Marais <mailto:jeannieboef@xxxxxxxxx>jeannieboef@xxxxxxxxx [EnergyPlus_Support] <<mailto:EnergyPlus_Support@xxxxxxxxxxxxxxx>EnergyPlus_Support@xxxxxxxxxxxxxxx> wrote:
> 
> Subject: Re: [EnergyPlus_Support] DX Cooling coil single speed
> To: <mailto:EnergyPlus_Support@xxxxxxxxxxxxxxx>EnergyPlus_Support@xxxxxxxxxxxxxxx
> Date: Wednesday, 6 July, 2016, 1:06 AM

> 
> 
>  
> 
> 
> 
> 
> 
> 
> 
> 
> 
> Dear Sandip,
> DX equipment models mostly use a set of 4
> curves that are generated using regression analysis from a
> matrix of performance data provided by the manufacturer.
> This matrix describes how the equipment performs under a
> wide variety of different operating conditions. The curves
> are each in their own right normalized around a set of
> "rating point" values.
> There are two tools available that I have seen
> to help you setup (and possibly understand better) the
> performance curves in conjunction with appropriate rating
> point values (they go hand in hand). One is a spreadsheet
> tool that comes with e+ and can usually be found in your
> launch bar. The other is from DesignBuilder. I use my own,
> but only I understand how it works.
> Be forewarned that this topic is probably the
> most advanced that the non-source-code writing simulation
> community can come up against. If you are a beginner e+
> user, my advice would be NOT to start with the most complex
> issues first. If you have gained a basic understanding about
> part-load (part of "rated full load") performance
> together with the other factors influencing HVAC performance
> (like the humidity in the air and the temperatures of both
> air and cooling medium, as well as bypass factor) that
> should be enough for now.
> The equation you wrote is one of several that
> are solved simultaneously using algorithms that converge on
> a solution. I'm sorry there is no easy answer. The
> interdependencies are simply too complex to solve by
> hand.
> Perhaps you state what you wish your model
> should demonstrate. Then state what you have done and what
> you observed, followed by what you cannot interperate or
> generate for results.
> Kindly yours,
> On 5 Jul 2016 2:15 pm,
> "sandip gupta <mailto:sandipgupta_nh@xxxxxxxxxxx>sandipgupta_nh@xxxxxxxxxxx
> [EnergyPlus_Support]" <<mailto:EnergyPlus_Support@xxxxxxxxxxxxxxx>EnergyPlus_Support@xxxxxxxxxxxxxxx>
> wrote:
> 
> 
> 
> 
> 
> 
> 
> 
> 
> 
> 
> 
> 
> 
> 
>  
> 
> 
> 
> 
> 
> 
> 
> 
> 
> Dear sir,'
> 
> While calculating the power consumption of a DX
> Cooling Coil Single Speed.
> 
> Step 1: Total Cooling Capacity as a function of temperature
> is calculated. Here from where does the Wet Bulb temperature
> comes from is it the sensor value.
> 
> 
> Step 2: Total Cooling Capacity as a function of flow
> fraction is calculated.
> 
> Step 3: Qtotal = Qtotal,rated * (TotCapTempModFac) *
> (TotCapFFModFac) is calculated but from where do we get
> Qtotal,rated. Pls help.
> 
> 
> 
> EnergyPlus? Version 8.5 Documentation Engineering
> Reference Page Number 785 calculations.
> 
> 
> 
> Please help me out how to calculate the power consumption of
> HVAC system for different set point temperature. Does the
> above calculations satisfy my requirements.
> 
> 
> 
> I would be very very thankful to you if you kindly solve my
> doubts and problems.
> 
> 
> 
> With Warm Regards,
> 
> Sandip Gupta.
> 
> 
> 
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> 
> 
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James V Dirkes II, PE, BEMP, LEED AP
CEO/President
The Building Performance Team Inc.
1631 Acacia Dr, GR, Mi 49504

Direct: 616.450.8653
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<http://buildingperformanceteam.com>Website l  <https://www.linkedin.com/pub/jim-dirkes/7/444/413>LinkedIn | <http://buildingperformanceteam.com/bpt-insights-blog/item/73-modeled-performance-isn-t-actual-performance>May 2016 ASHRAE Journal article on energy modeling


<p style="margin-bottom:6.0pt;text-autospace:none"><span style="font-size:10pt;font-family:Calibri,sans-serif;background-image:initial;background-position:initial;background-repeat:initial">Either I win ? or I learn. </span><br></p>

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