Hello Sir,
Thank you very much for quick
reply. I have a question about Power Coefficient of Pumps and Fan.
This is a parameter which is required for calculation of power consumption of
Pump and Fan. It is a user defined value. My question is : How can I calculate
the power coefficient or there is some standard value for constant speed and
variable speed pump and Fans? Please guide me. If there is some literature about
it please specify.
Regards,
Mayank
From: David BRADLEY
[mailto:d.bradley@tess-inc.com]
Sent: Thursday, March 22, 2012 10:34 PM
To: Mayank
Subject: Re: [TRNSYS-users] calculation of unmet hours
Mayank,
If you have access to the TESS Utility Library, you can use the
"zone temperature watcher: Type584." When zone temperature exceeds
the setpoint, you have an "unmet hour." If you do not have Type584, you
can write an equation that has a value of 1 if the zone temperature exceeds the
setpoint temperature.
On a related note, he first important thing to do is to define what you
mean by "unmet hours." In the industry, most often people refer to
"unmet load hours" If you are running your Type56 in energy rate
control mode (where you define a setpoint temperature and HEATING and COOLING
types inside TRNBuild and use the QSENS NTYPES to predict your
sensible energy loads) then you have the choice as to whether you limit or do
not limit the capacity of your idealized heating and cooling system. If you
limit the heating or cooling capacity then an unmet load occurs whenever the
Type56 zone temperature exceeds the cooling setpoint temperature or falls below
the heating setpoint temperature.
If your building is operating in temperature level control (where you
define a thermostat, an actual HVAC system and the zone temperature reacts to
what the HVAC system is doing) then "unmet load hours" are
meaningless because the "load" is never calculated at the space level
(the space reacts to the HVAC system's operation, it only indirectly commands
the HVAC system). In this case, we typically redefine "unmet load" as
time spent outside the throttling range of the thermostat (ie above or below
the deadband). Again Type584 is used to total the amount of time.
Kind regards,
David
On 3/19/2012 03:42, Mayank wrote:
Hello Everyone,
I need to calculate unmet hours of my system. Is there any
component in TRNSYS 16 or I have to make manual calculation.
Please guide me.
Regards,
Mayank
Bhatnagar
M.Tech.(Energy
Engineering)
Malaviya
National Institute of Technology,
Jaipur
(INDIA)
Ph.:
+91-9983816468
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--
***************************
David BRADLEY
Principal
Thermal Energy Systems Specialists, LLC
22 North Carroll Street - suite 370
Madison, WI 53703 USA
P:+1.608.274.2577
F:+1.608.278.1475
d.bradley@tess-inc.com
http://www.tess-inc.com
http://www.trnsys.com