<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
<style type="text/css" style="display:none;"> P {margin-top:0;margin-bottom:0;} </style>
</head>
<body dir="ltr">
<div style="font-family: Calibri, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);">
Greetings community. </div>
<div style="font-family: Calibri, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);" id="geom_inter_1630010826961_92_17">
I am modelling a multizone building and I have two questions.</div>
<div style="font-family: Calibri, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);" id="geom_inter_1630010826962_78_18">
First, I would like to know if I am modelling the geometry correctly (through the TRNbuild wizard). It is a two floor apartment building with two apartments in each floor, so in the floorplan window, I model it as two separate floors (three zones each, with
the middle zones representing the hallways)-as shown in the picture- and then connecting the floors with adjacent floors ( or ceilings). Is that the right way ? </div>
<div style="font-family: Calibri, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);">
Secondly, I am constantly running into problems with the air pump system I am using. I have tried both approaches -DOE coefficient and catalog data- type 966 and 954 respectively, but I cant seem to solve the warnings and errors of the simulation. Some common
problems i get are: Error 118 (SAT subroutine was called with a temperature below absolute zero), fail of input convergence, controller (Type 166) sticks for a considerable amount of timesteps. I also experience a very slow simulation even with a timestep
of 1 hour. I have tried many things like short timestep, calibrating the heat pumps capacity, increasing the zone's thermal capacitance, using the absolute instead of the relative humidity etc. but when I manage to erase one problem the other appears.</div>
<div style="font-family: Calibri, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);">
If anyone has some idea about what might be going wrong in my case I would be reaally grateful, considering the time I have consumed trying to get it right. I attached the .tpf of the simulation for better a understanding of my project. <span style="background-color:rgb(255, 255, 255);display:inline !important">Looking
forward for your ideas.</span></div>
<div style="font-family: Calibri, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);">
<span style="background-color:rgb(255, 255, 255);display:inline !important"><br>
</span></div>
<div style="font-family: Calibri, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);">
<span style="background-color:rgb(255, 255, 255);display:inline !important">Thanks in advance,</span></div>
<div style="font-family: Calibri, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);">
<br>
</div>
<div style="font-family: Calibri, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);">
Jim Soukoulis</div>
<div style="font-family: Calibri, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);">
National Technical University of Athens.</div>
<div style="font-family: Calibri, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);">
</div>
<div style="font-family: Calibri, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);">
</div>
</body>
</html>