TABLE OF CONTENTS The hourly zone air temperature profile can be thought of as the HVAC system control parameter. The cooling load is the rate at which heat must be extracted from the space in order to reach the air temperature specified in this profile for each hour. The base case example calculates the cooling load required to maintain an air temperature of 75 F for each hour of the day. For most cases, this is a conservative profile for peak load calculations, but in some cases, the designer may want to check the magnitude of the morning pick-up load as the system comes out of night setback. The pickup load can be calculated for any system specification. For example, suppose that the system is required to bring the zone air temperature from an overnight high of 87 F to the daytime setpoint of 75 F within two hours of when the system is turned on. The zone air temperature profile that matches this specification is shown in Table 3.10.
| Local Time | 1:00 | 2:00 | 3:00 | 4:00 | 5:00 | 6:00 | 7:00 | 8:00 | 9:00 | 10:00 | 11:00 | 12:00 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Inside Conditions | |||||||||||||
| Zone Air Temperature, F | AM | 86.0 | 86.0 | 87.0 | 87.0 | 81.0 | 75.0 | 75.0 | 75.0 | 75.0 | 75.0 | 75.0 | 75.0 |
| PM | 75.0 | 75.0 | 75.0 | 75.0 | 75.0 | 75.0 | 83.0 | 84.0 | 85.0 | 85.0 | 86.0 | ||
| People Number | AM | .00 | .00 | .00 | .00 | .00 | .00 | .5 | 2. | 4. | 4. | 4. | 4. |
| PM | 2. | 4. | 4. | 4. | 2. | .5 | .00 | .00 | .00 | .00 | .00 | .00 | |
| Lights, W/ft 2 | AM | 0.10 |
