TABLE OF CONTENTS The heat balance procedure software supplied with this manual can be used to calculate the heating load, as well as the cooling load. The usual assumptions applied to a heating load calculation are:
No solar input.
No internal gains.
Constant indoor and outdoor temperatures.
With the software, the solar input can be shut off by specifying a zero clearness on the zone data form as shown in Table 9.1.1. Only the first seven hours are shown since the values are constant.
| Zone Data | Units | |
|---|---|---|
| Latitude | Degrees | 40.0 |
| Longitude | Degrees | 88.0 |
| Time zone | Numeric | 6 |
| Month | Numeric | 7 |
| Day | Numeric | 21 |
| Zone north axis | Degrees | 0.0 |
| Zone height (for Vol.) | ft | 10.00 |
| Wind speed | ft/s | 11 |
| wind direction | Degrees from N | 0.0 |
| Barometric pressure | psi | 14.50 |
| Terrain | 1 5 | 2 |
| Clearness | 0 | |
| Rain flag | 0 | |
| Snow flag | 0 | |
| Ground reflectivity | 0.2 | |
| Building altitude | ft | 0 |
The inside and outside conditions are specified as shown in Table 9.1.2. Note that the infiltration should be specified so that it is included as a heat loss in this case. The system calculations are meaningless for the heating case, so system input is immaterial.
| Local Time | 100 | 200 | 300 | 400 | 500 | 600 | 700 | |
|---|---|---|---|---|---|---|---|---|
| Outside Conditions | ||||||||
| Outside Air Dry-Bulb Temperature | F | -20.0 | -20.0 | -20.0 | -20.0 | -20.0 | -20.0 | -20.0 |
| Outside Air... |
