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__ Climate Analysis and Design Response __

Temperature Range

This chart shows the dry bulb temperature ranges enclosing the recorded high and low temperatures.(round dots)

These statistics show that Houston, Texas average temperature is around 70° and the comfort level is around 73°. My design response for Houston’s temperature is to design a building that accepts natural ventilation while also having air conditioning and heating for when the temperature varies.

Balance Point Temperature Calculations


 * |||||||||| **BALANCE POINT TEMPERATURE CALCULATION (BPT)** ||  ||   ||   ||   ||   ||   ||
 * |||||| **1. INDOOR AIR TEMPERATURE, T1 =** ||  || ** 68.00 ** ||   |||||| **5. RATE OF SKIN LOSSES, BTUH/F** ||   ||   ||
 * |||||||||| INSTRUCTIONS: Change values in red to your input data. Values in blue are calculated. ||  ||   || AREA || R-VALUE || UA ||   ||
 * |||||| **2. INTERNAL ENERGY HEAT GAINS, BTUH** ||  ||   ||   ||   || SQ FT || INSUL. || BTUH/F ||   ||
 * ||  || AREA || DENSITY || HEAT || HEAT ||   || WALLS || ** 9500.00 ** || ** 14.00 ** || 678.57 ||   ||
 * ||  || SQ FT || W/SQ FT || KW || BTUH ||   || GLASS || ** 500.00 ** || ** 1.60 ** || 312.50 ||   ||
 * || LIGHTS || ** 10,000 ** || ** 0.50 ** || 5.00 || 17,065 ||  || ROOF || ** 10000.00 ** || ** 30.00 ** || 333.33 ||   ||
 * || EQUIP || ** 10,000 ** || ** 0.50 ** || 5.00 || 17,065 ||  || DOORS || ** 200.00 ** || ** 2.00 ** || 100.00 ||   ||
 * || MISC || ** 10,000 ** || ** 0.00 ** || 0.00 || 0 ||  || SUM || 20200.00 ||   || ** 1424.40 ** ||   ||
 * || SUM ||  ||   ||   || ** 34,130 ** ||   || AVERAGE ||   || 14.18 ||   ||   ||
 * |||||||||| **Copyright @ Leonard Bachman, 1999. For educational use only.** ||  ||   ||   ||   ||   ||   ||
 * |||||| **3. OCCUPANT INTERNAL HEAT GAIN, BTUH** ||  ||   ||   |||||| **6. RATE OF O/A LOSSES, BTUH/F** ||   ||   ||
 * || AREA || OCC PER || TOTAL || SENSIBLE || HEAT ||  || # OF || VENT || ACH || Qv ||   ||
 * || SQ FT || 1000 SQ FT || # OF OCC. || BTUH/OCC || BTUH ||  || OCC. || CFM/OCC || CU FT/HR || BTUH/F ||   ||
 * || ** 10000 ** || ** 7 ** || ** 70 ** || ** 314 ** || ** 21,980 ** ||  || 70 || ** 15 ** || 63000 || ** 1134 ** ||   ||
 * || **4. SOLAR** || AREA || SHADE % || SOLAR || HEAT ||  |||| **8. HEAT BALANCE** || BTUH || TOTAL ||   ||
 * || **GAIN** || SQ FT || SC || BTUH/SF || BTUH ||  || GAINS ||   ||   || ** 56110 ** ||   ||
 * || NORTH || ** 30 ** || ** 65% ** || ** 0 ** || 0 ||  || 30% || LIGHTS || 17065 ||   ||   ||
 * || EAST || ** 10 ** || ** 65% ** || ** 0 ** || 0 ||  || 30% || EQUIP || 17065 ||   ||   ||
 * || SOUTH || ** 200 ** || ** 65% ** || ** 0 ** || 0 ||  || 0% || MISC || 0 ||   ||   ||
 * || WEST || ** 10 ** || ** 65% ** || ** 0 ** || 0 ||  || 0% || SOLAR || 0 ||   ||   ||
 * || SUM || 250 ||  ||   || ** 0 ** ||   || 39% || PEOPLE || 21980 ||   ||   ||
 * ||  ||   ||   ||   ||   ||   || LOSSES ||   ||   || ** 56110 ** ||   ||
 * |||||||| **7. BALANCE POINT TEMPERATURE CALCULATION** ||  ||   || 27% || WALLS || 14882 ||   ||   ||
 * |||||||| BPT F=T1 - GAINS/(RATE OF LOSS) = F - BTUH/(BTUH/F) ||  ||   || 12% || GLASS || 6854 ||   ||   ||
 * |||||||| BPT F=T1 - (INTERNAL + PEOPLE + SOLAR)/(UA + QI) ||  ||   || 13% || ROOF || 7311 ||   ||   ||
 * ||  ||   ||   ||   ||   ||   || 4% || DOORS || 2193 ||   ||   ||
 * || **BPT F =** || ** 46.07 ** |||||| **degrees F Outside temperature** ||  || 44% || O/A || 24870 ||   ||   ||
 * ||  ||   ||   ||   ||   ||   ||   ||   |||||||| **9. SUMMARY OF FLOW AT BALANCE POINT CONDITION** ||   ||
 * ||  ||   ||   ||   ||   ||   |||||| Net glass Btuh = solar gain - heat loss || -6854 ||   ||
 * ||  ||   ||   ||   ||   ||   |||||| Net people Btuh = metabolic gain - O/A loss || -2890 ||   ||
 * ||  ||   ||   ||   ||   ||   |||||||| See bin data for relationship of balance point temperature to climate. The building will be in the heating mode for all hours the outdoor drybulb is below the BPT. Above the balance point the building is in the cooling mode. If the balance point is below 55 F, free ventilation cooling with 100% O/A may be feasible for dry bulb temperatures between 55 and BPT. ||   ||
 * ||  ||   ||   ||   ||   ||   |||||| Net people Btuh = metabolic gain - O/A loss || -2890 ||   ||
 * ||  ||   ||   ||   ||   ||   |||||||| See bin data for relationship of balance point temperature to climate. The building will be in the heating mode for all hours the outdoor drybulb is below the BPT. Above the balance point the building is in the cooling mode. If the balance point is below 55 F, free ventilation cooling with 100% O/A may be feasible for dry bulb temperatures between 55 and BPT. ||   ||
 * ||  ||   ||   ||   ||   ||   |||||||| See bin data for relationship of balance point temperature to climate. The building will be in the heating mode for all hours the outdoor drybulb is below the BPT. Above the balance point the building is in the cooling mode. If the balance point is below 55 F, free ventilation cooling with 100% O/A may be feasible for dry bulb temperatures between 55 and BPT. ||   ||

Erica Green 1269