Hi, Just realised my question ( original question excerpt extracted) is missing from my previous post. Here is my question:
".... question I have is that if the HVAC temperature plot against time will be of a cyclie behaviour. That is, will the temperature cycle likely to repeat after many time steps? I have ran the simulation for 2000 time steps. That is, approximately 2000/60 seconds ~ 33 mins real time (not simulation time) . There do not seem to be any cycling of the temperature behaviour. My outdoor temperature during this 33 mins is kept at a constant of 90.0. I wonder if the non-cyclic (and looks to me somewhat stochastic) behaviour is a result of the JVM implementation as you have replied earlier ? My next query is about the desired set point of 70. I understand that the cooling will only be activate when the temperature reaches 72 or higher. When the temperature falls below 70, the dampers will shut, thus ceasing the cooling effect of the cool air beign pumped out of the vents. From my simulation graph, it seems to be that the temperature is "triangulating" between 70 and 72. If we were to consider teh extremes of both guard lines (i.e. 72 and 70), the temperature hovers around 70 more than it does at 72. In fact, it never quite hover at 72 at all. I suppose this is because everytiem the temperature reaches 72, the algorithm will pump the cool air INTO the room, thus cooling starts almost immediately. However, there are some ripples (hovering around 70). Back to my original question of set point, it seems to me that the set point is actually 71 and not 70. Over long time, the temperature graph oscillates (in a somewhat triangular fashion) between 70 adn 72 yielding a "perceived" set point of 71. This seems to be contrary to what your algorithm is trying to set ..... " Many thanks once again. Regards David -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of David Sent: Sunday, November 09, 2003 1:12 AM To: JESS Subject: JESS: HVAC Example in Book Hi guys, This question was originally posted as a follow-up at the Manning website. I wonder if anyone here has tried the HVAC simulation and have similar queries like I do. Will be very thankful if you can point me to the right direction. What I did was to run the simulation as provided in the JIA book. I made some amendments to the code so that the temperature readings for every second is being written to a excel file. I then plotted the temperature series VS time. I can send the excel file ( and the corresponding graphs) to those who are interested in seeing the graph patterns in relation to my query. P/S: As this question was originally posted at the JIA website, I apologise for the cross-post for those who is on that site and this mailing list as well. Many thanks in advance. Warmest Regards David " -------------------------------------------------------------------- To unsubscribe, send the words 'unsubscribe jess-users [EMAIL PROTECTED]' in the BODY of a message to [EMAIL PROTECTED], NOT to the list (use your own address!) List problems? Notify [EMAIL PROTECTED] --------------------------------------------------------------------
