23.12.2014 Views

OCTOBER 19-20, 2012 - YMCA University of Science & Technology

OCTOBER 19-20, 2012 - YMCA University of Science & Technology

OCTOBER 19-20, 2012 - YMCA University of Science & Technology

SHOW MORE
SHOW LESS

You also want an ePaper? Increase the reach of your titles

YUMPU automatically turns print PDFs into web optimized ePapers that Google loves.

program developed can be broadly classified into following major parts.<br />

Proceedings <strong>of</strong> the National Conference on<br />

Trends and Advances in Mechanical Engineering,<br />

<strong>YMCA</strong> <strong>University</strong> <strong>of</strong> <strong>Science</strong> & <strong>Technology</strong>, Faridabad, Haryana, Oct <strong>19</strong>-<strong>20</strong>, <strong>20</strong>12<br />

1.) A program for calculation <strong>of</strong> heat gain through wall and ro<strong>of</strong><br />

2.) A program for calculation <strong>of</strong> heat gain through window and door<br />

3.) A program for calculation <strong>of</strong> heat gain through infiltration & ventilation.<br />

4.) A program for calculation <strong>of</strong> internal heat gain.<br />

5.) A program for calculation <strong>of</strong> space cooling load from heat gain<br />

For developing these programs separate algorithm have been written for each case. So by running the program<br />

one can have the hourly cooling load <strong>of</strong> any building after putting the required<br />

input details.<br />

16. Comparison <strong>of</strong> Wall Heat Gain and Cooling Load Calculation by FDM & CTF<br />

method<br />

For a particular day Wall Heat Gain and then Cooling Load are calculated by using FDM and CTF method. The<br />

results found are summarized in the form <strong>of</strong> graph.<br />

The temperature distribution across the wall over 24 hour is shown in graph taking three nodes as representative<br />

nodes. From the results we can see that at 1hr the inside surface temperature is less than both outside and<br />

interior node for this particular location. The interior node has higher temperature during night as it has heat<br />

absorbed during daytime. During daytime the temperature distribution decreases as we go from outside to inside.<br />

Heat gain and cooling load variations with sol-air temperature are shown in graph. As we can see there is some<br />

time lag between the peak values <strong>of</strong> the three variables. The heat gain starts to rise after some time lag from the<br />

sol- air temperature starts to rise. This is because some time should pass before the heat absorbed in the outside<br />

surface reaches to the room. The radiant portion <strong>of</strong> the heat gain will not create an immediate load, as it has to<br />

be absorbed and reradiated back before creating a load. This will create some time gap between the peak values <strong>of</strong><br />

heat gain and cooling load.<br />

214

Hooray! Your file is uploaded and ready to be published.

Saved successfully!

Ooh no, something went wrong!