Non Isothermal Office Room Case Study

4-2-3-1 Case-I (Non-isothermal office room)

The airflow is discharged horizontally from the front surface of the DV system, as shown in Fig.(4-1). The supply air velocity is (0.25 m/s), the airflow rate is 50.48 l/s, the air supply temperature is (20oC), and turbulence intensity of 5% is specified. Table(4-3) lists the values of heat flux for different items in the tested room that calculated in chapter three.

Table(4-3) Heat flux for walls and different items, case-I

Item Heat flux W/m2 Item Heat flux W/m2 person1. 58.2 tables 0 person2 58.2 north wall 5.46 computer1 65 south wall 7.96 computer2 65 east wall 3.9 window 14.14 west wall 4.06 door 8.44 ceil wall 8.82

The measured temperature of floor surface is 23oC

Numerical analyses and computational fluid dynamics (CFD) are used to simulate the indoor airflow and air temperature distribution. Two cases were studied for classroom to find acceptable air temperature and velocity distribution and thermal comfort inside space for different locations of exhaust grills. The results was compared with standard values due to Iraqi cooling code. a- Cases Description The air temperature and velocity distribution are predicted inside the classroom with a dimensions of (7*4 and 3m height) as shown in Fig.(4-3a) for case-IIIa where the exhaust grills location on the north side wall, Fig.(4-3b) for case-IIIb where the exhaust grills location on the room ceiling, there are (17) persons, (9) tables,(3) overhead lights and one T.V show inside the occupied region. All dimensions listed in table (4-5). Fig(4-4) presents the plane view of a classroom with a floor area (28m2). The north wall exposed to outside conditions and it has a window, the south wall oriented to an inside corridor and the other room sides are a partitions between rooms at same design inside air temperature (24oC due to Iraqi cooling cod tables). In Iraqi buildings the walls mainly formed from multi- materials as (cement, common brick and gypsum) as shown in Fig.(4-5a) and floor materials shown in Fig.(4-5b). Details of materials and thickness listed in