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Dear Cathy <br>
<br>
On 12/28/2011 06:41, sun liang wrote:
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1. I know that when I use the Ventilation to delivery the
cold and hot air into the controlled zone, the Cooling and
Heating must be turn off. The temperature of the
controlled zone is used to adjust the temperature and flow
rate of the ventilating air. But I also want to obtain the
cooling load or heating load on this occasion. How can I
reach my aim?<br>
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Type56's automatic HEATING and COOLING Types calculate the sensible
energy required to maintain a predefined set point temperature (also
called the sensible load). When you change to a controller that is
trying to maintain the zone temperature by varying the temperature
and flow of supply air, the "load" is no longer defined; in order to
define the load, you need to <i>predefine </i>the actual room
temperature (note that the actual room temperature and the room
setpoint temperature are not the same thing!). Instead, the concept
of "load" is replaced by the actual energy that is being adding to
or removed from the zone. How to see this quantity depends a bit on
what Types are in your system. If you are heating using a furnace,
you would look at the output of the furnace that tells how much
energy it added to the air stream. If you are using heat pumps, you
would look at the heat pump output that shows how much energy was
added to the airstream. You could also use a pair of Type33s
(psychrometrics) to compute the enthalpy of the supply (h_in) and
return air (h_out), then compute q=mdot*(h_out-h_in).<br>
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<td style="font: inherit;" valign="top">2. When using
TRNBuild to design the controlled zone, I am confused by
defining control strategy and scale in designing the
Artificial Lighting.<br>
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The "control strategy" and "scale" fields in the Artificial Lighting
gain window allow you to adjust the heat gains from lighting that
the space experiences. Both are typically a value between 0 and 1
and they act as a multiplier on the base value that you specified
using the "total heat gain" and "related floor area" fields. As with
many things in TRNBuild/Type56, you have the option of selecting a
constant value, scheduling a value, or telling Type56 that the value
will come from some other Type (or equation) as an INPUT. <br>
<br>
<blockquote
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<td style="font: inherit;" valign="top">3. The TRNSYS
software I used is Version 16 and was bought from the
agency of China Mainland. The agency said that I had to
pay if I want to upgrade my software to Version 17. I want
to know how the software is upgraded for free. By the way,
my software does not have a serial number but a Passdog.<br>
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The update from TRNSYS 16.x to TRNSYS 17.x is a paid update. Within
each major version number (16, 17, etc.) there are periodic minor
version updates (16.1, 16.2, 16.3, etc.) which are free. <br>
<br>
Kind regards,<br>
David<br>
<br>
<pre class="moz-signature" cols="72">--
***************************
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
<a class="moz-txt-link-abbreviated" href="mailto:d.bradley@tess-inc.com">d.bradley@tess-inc.com</a>
<a class="moz-txt-link-freetext" href="http://www.tess-inc.com">http://www.tess-inc.com</a>
<a class="moz-txt-link-freetext" href="http://www.trnsys.com">http://www.trnsys.com</a></pre>
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