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Re: [EnergyPlus_Support] DX Cooling coil single speed
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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Posted by: sandip gupta <sandipgupta_nh@xxxxxxxxxxx>
------------------------------------
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