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Re: [EnergyPlus_Support] DX Cooling coil single speed



Dear sir,
              I feel that I am taped into this subject 
Surface Inside Face Convection Heat Transfer Coefficient is it the property of the surface or does it changes with temperature set point change. 
I will tell you my main objective 
I want to get maximum number of variables from from e+ to matlab so that my calculation burden is reduced but I want to know the relation which will guide me 
to find the change in Zone Air Heat Balance Surface Convection Rate for a given outdoor temperature and set point temperature.
In every time step i am taking the feedback of the variables from e+ to matlab that I csan do easily I know how to do it. 
But tell me how the relation is obtained for every time step i will do the calculation.

Regards,

--------------------------------------------
On Wed, 6/7/16, Jean Marais jeannieboef@xxxxxxxxx [EnergyPlus_Support] <EnergyPlus_Support@xxxxxxxxxxxxxxx> wrote:

 Subject: Re: [EnergyPlus_Support] DX Cooling coil single speed
 To: EnergyPlus_Support@xxxxxxxxxxxxxxx
 Date: Wednesday, 6 July, 2016, 9:35 PM
 
 
  
 
 
 
   
 
 
     
       
       
       Convection heat transfer is equal
 to the heat transfer across the surface and can be easily
 calculated using the u-value of the surface including film
 resistances in W/(m2*K).
 The problem is that the film resistances change
 at each time step due to changing convection coefficients.
 Depending on what algorithm you chose to use (TARP, DOE,
 etc.) these are calculated for each surface using parameters
 such as orientation, local air velocity assumptions, volume
 aspect ratios, etc. 
 Also, the energy transfer can use a conduction
 FiniteDifference (condFD) method or CTF (default) method to
 take capacitive effects into account.
 Additionally, other equipment may be defined
 that either transfer energy directly to the air node via
 convection or to all the surfaces first which in turn
 changes their surface temperatures and heat transfer across
 them.
 Again, there are several things going on that
 converge on a solution. This is exactly why we use
 EnergyPlus. Don't calculate this with Matlab, instead
 feed the results of the heat transfers from e+ to Matlab if
 you require them.
 
 
 On 6 Jul 2016 3:27 pm,
 "sandip gupta sandipgupta_nh@xxxxxxxxxxx
 [EnergyPlus_Support]" <EnergyPlus_Support@xxxxxxxxxxxxxxx>
 wrote:
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
  
 
 
 
   
 
 
     
       
       
       Dear sir,
 
 
 
 Actually I am desigining a controller in matlab and through
 BCVTB I am sending the set point to E+. Now Most of the
 variables I am using from reporting variable. The only
 problem I am now facing is with calculation of  
 
   ZSF1:Zone Air Heat Balance Surface Convection Rate [W]
 and  Air Heat Balance Outdoor Air Transfer Rate [W]. 
 
 Can u help me with the related formulas used to calculate
 the above values. So that I can develop a suitable logic.
 
 
 
 
 Regards,
 
 --------------------------------------------
 
 On Wed, 6/7/16, Jim Dirkes jim@xxxxxxxxxxxxxxxxxxxxxxxxxxx
 [EnergyPlus_Support] <EnergyPlus_Support@xxxxxxxxxxxxxxx>
 wrote:
 
 
 
 Subject: Re: [EnergyPlus_Support] DX Cooling coil single
 speed
 
  To: "EnergyPlus_Support@xxxxxxxxxxxxxxx"
 <EnergyPlus_Support@xxxxxxxxxxxxxxx>
 
  Date: Wednesday, 6 July, 2016, 6:09 PM
 
  
 
  
 
   
 
  
 
  
 
  
 
    
 
  
 
  
 
      
 
        
 
        
 
        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 sandipgupta_nh@xxxxxxxxxxx
 
  [EnergyPlus_Support] <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 jeannieboef@xxxxxxxxx
 
  [EnergyPlus_Support] <EnergyPlus_Support@xxxxxxxxxxxxxxx>
 
  wrote:
 
  
 
  
 
  
 
  Subject: Re: [EnergyPlus_Support] DX Cooling coil single
 
  speed
 
  
 
   To: 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 sandipgupta_nh@xxxxxxxxxxx
 
  
 
   [EnergyPlus_Support]" <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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  -- 
 
  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
 
  jim@xxxxxxxxxxxxxxxxxxxxxxxxxxx
 
  
 
  Website l  LinkedIn |
 
  May
 
 
 
 2016 ASHRAE Journal article on energy modeling
 
  
 
  
 
  
 
  
 
  
 
  
 
  
 
  
 
  
 
  
 
  
 
  
 
  
 
  
 
  
 
  
 
  Either I win � or I learn. 

 
  
 
  
 
  
 
  
 
      
 
       
 
  
 
      
 
      
 
  
 
  
 
  
 
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------------------------------------
Posted by: sandip gupta <sandipgupta_nh@xxxxxxxxxxx>
------------------------------------

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