CC training!

2011/5/24  CC training tour

PART 1:  Morning tour 10:00—12:20 ( DDVAV)   John and iraj

That morning, we visited the DDVAV system in Evans Library.

We went to the mechanic rooms in library on that day. The first mechanic room we went to is located in the basement of Evens library. We discussed the function of VFD. John gave us the example that when VFD is 60HZ it can make the motor supply 60 horse power. If the VFD keeps 60 Hz, Whether it can make the motor to supply 50 house power energy. It cannot, because the frequency of VFD will go down due to reducing the load. That means if the motor supplies 50 horse power energy, the frequency of VFD should below 60 Hz. That is the reason why we use VFD because we use it to save energy.

Then we went to see the chiller of Evens library. There are two types of chillers, one is the water cold chiller, and the other one is the air cold chiller. For Evens, they use air cold chiller. Air-cooled chillers use the mechanical refrigeration cycle to produce chilled water. Air-cooled chiller is more economic than water-cooled chiller. The cooling tower works like air-cooled chiller. So when the OA temperature is low, the chilled water can be directly used for cooling the coil, which can be energy efficient In addition, if the HVAC system has economizer, the outside air can be used for cooling.

At last, we went to the mechanic room in the third floor of Evens Library. At there I understand the different between the electrical valve and the pneumatic valve. And we had the chance to see how DDC worked. Then translator changes the analog signals, which is collected by the sensors, into digital signals. Then, these digital signals will be sent to controller for future control.

PART 2:  Afternoon tour 1:30—4:30 Iraj

In the afternoon, we visited the SDVAV system first. The diffusers there are interesting, because they are located on the same duct as shown below:

The supply air goes like the arrow implied. At first I wonder if there are so many diffusers on that duct the pressure will go down after each diffuser. Nevertheless, as we can see, when add more diffusers on this duct, the dimension of it will be reduced. In this method, the pressure will be kept at the same level. 

After the short tour for this visit, we had the chance to see DDVAV system with economizer. The model of this system is as following:

When in the economizer condition, the damper between return duct and supply duct will be closed, the damper of relief duct will be opened 100% and the damper of outside air duct will be opened 100%. While when the building don’t need to use economizer, the damper between return air duct and supply air duct will be opened, the relief and outside air duct will be opened according the need of the system.

Then we saw different sensors for HVAC system. For example, the difference between pressure sensor and temperature sensor is that the pressure sensor always has the isolation valve. Moreover, we learned how to install the different sensor for different purposes. For example, if we want to measure pressure after fan, we need install a sensor before the fan and a sensor after the fan, and then the difference between the two sensors is the pressure.

The flow monitor needs to be cleaned on time because there are many holes on that monitor. If now clean it, it will not work anymore.

The last HVAC system we saw is the one located in Wasinbaker. There we focus on the freezestat.

The freezestat is used to protect coils.

The location of the freezestat we saw has something wrong with it. The Model looks like following:

The set point of this freeze stat is that it will be turned off the heat coil when outside temperature below 38 degree. The problem for the freeze stat we saw is that it is set before heating coil. However, the right position should be after the heating coil and before the cooling coil.

ARCH 653 Final Project

           1. What I want to realize in my final project

When Dr. Yan introduce API to me, I felt I can use it create something cool. Based on the layout of my model, I found I could add natural ventilation on this house. If we use natural ventilation in a proper way, we can achieve the economic and healthy purpose for sustainable design.

Based on others finding on nature ventilation, and what I have learned about it. I have the idea similar with the picture as followed:

                                             this pic comes from : http://cmiserver.mit.edu/natvent//nvdescription.htm

As we know, the cool air is heavier than the warm air. Therefore, I decide to open the windows on the top of my model when I need to use natural ventilation. What is more, due to the different direction of the wind, we should adjust the open strategy. That means depend on different direction of the wind, we should open the corresponding windows. Besides that, the comfortable wind speed is another important element we should consider.

2.    Collect wind data

 This is the wind wheel (also named wind rose) in June in College Station. From that, we can see wind comes from south and east a lot in summer. I observed the day-by-day wind direction and speed in June and I create the general wind speed and direction spreadsheet based on my observation.

I use 1,2,3,4 to represent different direction, in this way C# can understand what I want directly. This data was been created based on my observation for June, so it is not the real data.

3.      Analysis building model

I get ids for the windows on different walls, and I chose two pieces window on the top of this house
for letting the hot air out.



 4.      Programming

Following is the structure of my code

4.1  Code for getting objects

 #region 2. Get objects

// use id to get the WindowWind family instance

ElementId id;

Parameter open;

int[] IDSN = new int[] { 510867, 510870, 510873, 510876, 510879,

510882, 503988, 505065 };

int[] IDSS = new int[] { 509929, 510026, 510075, 510104, 510146,

510189, 503988, 505065 };

int[] IDSW = new int[] { 470384, 470388, 470392, 470395, 470208,

470211, 470215, 470218, 470272, 470276,

470280, 470283, 470320, 470323, 470327,

470330, 503988, 505065 };

int[] IDSE = new int[] { 470953, 503828, 504230, 504388, 504414,

504464, 504498, 504544, 504674, 504770,

504796, 503988, 505065 };

int[] IDSUP = new int[] { 503988, 505065 };

#endregion

After that, I assigned each curtain panel to each variable : IDSN ( windows on the north wall), IDSS (windows on the south wall), IDSW (windows on the West wall), IDSE (windows on the east wall), IDSUP ( windows on the top).

  4.2 Create form interface

  #region 3. Get user input from a pop up dialog window and use it

to update the model

            Form1 form1 = new Form1(); //Create the form instance

            form1.ShowDialog(); //Show the form. Upon OK, the user input value will update Windows open situation

What I used in coding form perform is as following:

comboBox1.Items.Add(new userData("1AM", 1));

            comboBox1.Items.Add(new userData("2AM", 2));

            comboBox1.Items.Add(new userData("3AM", 3));

            comboBox1.Items.Add(new userData("4AM", 4));

            comboBox1.Items.Add(new userData("5AM", 5));

            comboBox1.Items.Add(new userData("6AM", 6));

            comboBox1.Items.Add(new userData("7AM", 7));

            comboBox1.Items.Add(new userData("8AM", 8));

            comboBox1.Items.Add(new userData("9AM", 9));

            comboBox1.Items.Add(new userData("10AM", 10));

            comboBox1.Items.Add(new userData("11AM", 11));

            comboBox1.Items.Add(new userData("12PM", 12));

            comboBox1.Items.Add(new userData("1PM", 13));

            comboBox1.Items.Add(new userData("2PM", 14));

            comboBox1.Items.Add(new userData("3PM", 15));

            comboBox1.Items.Add(new userData("4PM", 16));

            comboBox1.Items.Add(new userData("5PM", 17));

            comboBox1.Items.Add(new userData("6PM", 18));

            comboBox1.Items.Add(new userData("7PM", 19));

            comboBox1.Items.Add(new userData("8PM", 20));

            comboBox1.Items.Add(new userData("9PM", 21));

            comboBox1.Items.Add(new userData("10PM", 22));

            comboBox1.Items.Add(new userData("11PM", 23));

 comboBox1.Items.Add(new userData("12AM", 24));

That means, when people chose 1AM, it will returen 1 to C#.

   4.3 Code for open windows

I use the way I open the windows on the south as an example. The ways I opened other windows on remaining walls are almost same.

I use Open as my parameter to determine whether to open or not. Because I add the Yes/No parameter to decide curtain panel’s visibility and I assigned this Yes/No parameter to the parameter open. So when open=1 , that means we can see the curtain panel that is to say the windows closed. While when open=0 when cannot see the curtain panel, that means the windows are be opened. 

#region 3.1.1 south

            else if (speed <= 15)

            {

                if (direction == 1)

                {

                    MessageBox.Show("The windows on the south wall have been opened");

                    for (int n = 0; n < IDSS.Length; n++)

                    {

                        id = new ElementId(IDSS[n]);

                        FamilyInstance panelInstance = doc.get_Element(id) as FamilyInstance;

                        open = panelInstance.get_Parameter("visible");

                        open.Set(0);

                    }

Above means when the wind speed is small than 15 km/h, C# will go to my spreadsheet find the wind direction fot that time, if the direction number is 1 (1=means South), the windows on the south wall will be opened.

                    for (int n = 0; n < IDSUP.Length; n++)

                    {

                        id = new ElementId(IDSUP[n]);

                        FamilyInstance panelInstance = doc.get_Element(id) as FamilyInstance;

                        open = panelInstance.get_Parameter("visible");

                        open.Set(0);

The code above means when we need natural ventilation, the windows on the top will  be opened.

                    }

The following code means windows on other walls will be closed.

                    for (int n = 0; n < IDSN.Length; n++)

                    {

                        id = new ElementId(IDSN[n]);

                        FamilyInstance panelInstance = doc.get_Element(id) as FamilyInstance;

                        open = panelInstance.get_Parameter("visible");

                        open.Set(1);

                    }

                    for (int n = 0; n < IDSE.Length; n++)

                    {

                        id = new ElementId(IDSE[n]);

                        FamilyInstance panelInstance = doc.get_Element(id) as FamilyInstance;

                        open = panelInstance.get_Parameter("visible");

                        open.Set(1);

                    }

                    for (int n = 0; n < IDSW.Length; n++)

                    {

                        id = new ElementId(IDSW[n]);

                        FamilyInstance panelInstance = doc.get_Element(id) as FamilyInstance;

                        open = panelInstance.get_Parameter("visible");

                        open.Set(1);

                    }

                }

 

 

               4.4  Code for close the widows

#region 3.3.5 close the windows

           

if (speed > 15)

            {

                for (int n = 0; n < IDSW.Length; n++)

                {

                    id = new ElementId(IDSW[n]);

 FamilyInstance panelInstance = doc.get_Element(id) as FamilyInstance;

                    open = panelInstance.get_Parameter("visible");

                    open.Set(1);

                }

                for (int n = 0; n < IDSE.Length; n++)

                {

                    id = new ElementId(IDSE[n]);

 FamilyInstance panelInstance = doc.get_Element(id) as FamilyInstance;

                    open = panelInstance.get_Parameter("visible");

                    open.Set(1);

                }

                for (int n = 0; n < IDSS.Length; n++)

                {

                    id = new ElementId(IDSS[n]);

 FamilyInstance panelInstance = doc.get_Element(id) as FamilyInstance;

                    open = panelInstance.get_Parameter("visible");

                    open.Set(1);

                }

                for (int n = 0; n < IDSN.Length; n++)

                {

                    id = new ElementId(IDSN[n]);

 FamilyInstance panelInstance = doc.get_Element(id) as FamilyInstance;

                    open = panelInstance.get_Parameter("visible");

                    open.Set(1);

                }

                MessageBox.Show("The wind outside is too heavy to open the windows");

               

            }

# endregion

           5.  Result

          5.1  Colse all of the windows

 In that time, the windows was opened for vitilation

The wind speed is increasing in the next hour, so the pop window come out showing the information ”the outside wind speed is too high to open the windows”.

All of the windows are closed due to the heavy wind speed.

5.2  open windows on one wall while close remaining windows on other walls

An hour before, the windows on the south wall were opened, if you chose the next hour, the window on the east will be opened. We can see , when the windows on the east be opened, the windows on the south has been closed.