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Re: [EnergyPlus_Support] DX Cooling coil single speed
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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