Would be delighted to watch more videos from Energy Efficiency/ Green Mark point of view. Also, comparing different cooling systems or brands or system designs for their efficiency. Also, maybe explaining what is a water cooled packed unit? etc. Many video opportunities here. Thanks in advance
Thank you for the video. Please I want to know what happens when the big room temperature is higher than the setpoint; say 25°c, the medium room is 22°c, and the small room is 18°c. How does the AHU and the BMS handle this situation?
@alexekwueme7477 It depends. If each room needs about 1500 CFM, then it is likely that every room needs a VAV box. Otherwise, 2-4 rooms can share one VAV box. Each room will then rely on the radial or OBD on their diffuser to adjust to their required airflow (eg: 150, 250, 700, etc.). If multiple rooms are sharing one VAV box and each room diffuser doesn’t have volume control damper, then small room will indeed be overcooled since majority of the temperature control comes from the big room because the big room contributes more airflow for the control.
are there VAV boxes with Larner-Johnson type valves? partially open buterffly valves produce turbulence at high CFM which is not only noisy but also increases pumping losses
very helpful kindly also mention about pressure dependent and pressure independent VAVS
This vedio is very helpful for HVAC technician .Hey I am Indian
Great explanation!
Would be delighted to watch more videos from Energy Efficiency/ Green Mark point of view. Also, comparing different cooling systems or brands or system designs for their efficiency. Also, maybe explaining what is a water cooled packed unit? etc. Many video opportunities here. Thanks in advance
Very youthful information thanks
No problem
Also, maybe explaining what is heat balance and it's importance. How to calculate total system efficiency. How to also size cooling towers and pumps
Thank you for this informative video ❤
Anytime
Great video information 👍❤
Thank you for sharing your knowledge and experience 🇵🇭🫡
clear and informative !
Great!
What about series VAV with fan powered box how to set up
Good
I have a problem with the central air conditioning thermostat, manual train, manual train thermostat model 1577, error 2 appears
Thank you for the video. Please I want to know what happens when the big room temperature is higher than the setpoint; say 25°c, the medium room is 22°c, and the small room is 18°c. How does the AHU and the BMS handle this situation?
I think in this case should recalibrate the VAV airflow in those rooms. The big room needs more airflow while reducing the airflow in the small room.
@@aircondloungeso that means each duct that connects each room must have a VAV?
@alexekwueme7477 It depends. If each room needs about 1500 CFM, then it is likely that every room needs a VAV box. Otherwise, 2-4 rooms can share one VAV box. Each room will then rely on the radial or OBD on their diffuser to adjust to their required airflow (eg: 150, 250, 700, etc.). If multiple rooms are sharing one VAV box and each room diffuser doesn’t have volume control damper, then small room will indeed be overcooled since majority of the temperature control comes from the big room because the big room contributes more airflow for the control.
And the thermostat used to control the VAV is likely located in the big room as well.
@@aircondlounge I think each room should have VAV and it's damper plus thermostat for full control of the air in the rooms.
are there VAV boxes with Larner-Johnson type valves? partially open buterffly valves produce turbulence at high CFM which is not only noisy but also increases pumping losses
I have not seen such a VAV damper, mostly are very basic ones. Designing
Where is the CAV discussion?