Date post: | 15-Aug-2015 |
Category: |
Engineering |
Upload: | shyam-anandjiwala |
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Heat Exchange Analysis Of G+3 Residential Building
Presented by
Aswin Baby
Itihas Dhareppagol
Shyam Anandjiwala
Swosti Sunder Sen
Vineeth M S
INDIAN INSTITUTE OF TECHNOLOGY DELHI
INTRODUCTION
Heat exchange mechanisms in a building:
• Conduction• Convection• Radiation
Case study:Heat exchange analysis of a G+3 residential building situated in New Delhi with aspect ratio>1
Aim: To develop a computer program in excel spread sheet to obtain the 24 hourly internal temperature for a naturally conditioned building with variable ventilation condition and comparing the results with the results obtained by computer software.
Data collection
Temperature Data obtained from: INDIAN SOCIETY OF HEATING, REFRIGERATING AND AIR CONDITIONING ENGINEERS (ISHRAE)
Radiation data from the journal: “Estimation of hourly solar radiation on horizontal and inclined surfaces in western Himalayas” by Shyam S Chandal and Rajeev K Agarwal-Scientific research journal smart grid and renewable energy-2011
Data collection (contd.)
Hourly variation of number of air exchange: assumed arbitrarily
Data collection (contd.)
Latitude :N (New Delhi)
Building Selection:
Wall Details
Cosi = Cosϒ Cosβ
Incident Radiation on walls
I = Ib cosi
Ventilation heat transfer coefficient ( Cv )values
Cv=NV/3
volume of roomV=8.7x6x3m3
∑UjAj+Cv calculations
∑AY+Cv calculations
RHS matrix calculations∑UjAjαjImj/hoj +∑AjImjθmj + Cv (i)Tfo(i) + ∑µjUjAj[Toa(i-φj)-Tmo] + ∑µjUjAjαjIfj(i-φj)/hoj +∑AjIfj(i)θj
∑UjAj + Cmv
Coefficient of Tfi for ith hour = Cvi/24
25x25 Matrix
This matrix will give the hourly temperature fluctuations along with ΔTm
Inverse of the matrix
Calculation of ΔTm and 24 hourly variation Tfi
[A] X [T]=[B]
[A]=25X25 matrix
[T]=25x1 matrix containing variables ΔTm & Tfi(i), where i=1,2,3,....n
[B]= 25x1 matrix containing RHS values
[T]= [A]-1X [B]
Thus we can obtain the fluctuating component of internal temperature
for every hour and from that total internal temperature is found out. The
above matrix calculation is for 3rd floor. Similarly we can do for all other
floors.
INTERNAL TEMPERATURE FOR THE BUILDING
GRAPHICAL REPRESENTATION OF HOURLY VARIATION OF INTERNAL TEMPERATURE FOR EVRY MONTH FOR 3RD FLOOR
SOFTWARE ANALYSIS FOR INTERNAL TEMPERATURE AND THERMAL LOADS
3D IMAGE OF BUILDING IN EQUEST
Heating and cooling loads by EQuest & Excel
Graphical plot for hourly variation of internal temperature from EXCEL
Graphical plot for hourly variation of heating/cooling load from EQUEST
Graphical plot for hourly variation of internal temperature in the month of January by Autodesk Ecotect & Excel
Graphical plot for hourly variation of internal temperature in the month of June by Autodesk Ecotect & Excel
THANK
YOU