Mr. and Mrs. Moodley plan to install air conditioning in the open plan section of their home.
i.e. This includes the entrance, living room, dining room and kitchen. The air conditioning
expert recommended and specified an aircon unit that has an ACH value of 554 m3 / h.
Air Changes per Hour (ACH) tells you that the unit expels (output) 554 cubic meters of
air from the rooms in one hour. Normal domestic air conditioners typically have a value
between 2 and 8 times an hour. How many times an hour will this device change the air in
the open plan section in one hour. To apply this data to the open plan section, follow the
point form instructions from i. through to iii.:
i. Calculate the volume of the open plan section
(3
marks)
To calculate the volume of the open plan section, we need to multiply the length, width, and height of the space. Let's assume the dimensions are as follows:
Length = 10 meters
Width = 6 meters
Height = 2.5 meters
Volume = Length x Width x Height
Volume = 10m x 6m x 2.5m
Volume = 150 cubic meters
The volume of the open plan section is 150 cubic meters.
ii. Calculate the number of air changes per hour
(3 marks)
To calculate the number of air changes per hour, we need to divide the ACH value by the volume of the open plan section.
Number of air changes per hour = ACH value / Volume
Number of air changes per hour = 554 m3 / h / 150 m3
Number of air changes per hour = 3.69
The air conditioning unit will change the air in the open plan section approximately 3.69 times per hour.
iii. Final answer
(1 mark)
The air conditioning unit will change the air in the open plan section approximately 3.69 times per hour.