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Hi Experts, Happy New Year to All, Could some experts throw light on HVAC validation protocols such as DQ,IQ,PQ & OQ. Is it related to ASHRAE or Building Codes? Best regards, Manu

Dear Experts, I could not get the influential temperature zone for cassette unit terminal device. Was planning for Daikin make : FXFQ63LUV1 model no. Has anyone used this in any projects. Appreciate share the zone that can be covered by the throw from this unit. Details noted below: Room...

Hi Experts, As I understand the new Ventilation meeting Energy savings would work on Carbon dioxide sensors output. However in some occasions there has been cases where carbon monoxide sensors are also used. I believe Carbon monoxide is used in Parking lots and Carbon dioxide in Human...

Hi Experts, Can I use a soft starter for AHU of 14000CFM. FCU of 4TR hopefully can be connected to direct online. Please share your thoughts. Thanks, Manu

So would it be correct to understand that In a coil where more rows are available will be for the Latent heat removal or dehumidification. Will the both section be available in the same frame of the coil or the coils for sensible and dehumidification are different set of coils with their...

Given the area/space larger no of coils will increase the capacity, as I believe. How does that connect to the sensible heat capacity that too inversely. Manu

Hi Experts, What should be parameters for a no of coils decision for a AHU. As the coil no increases from 4 to 6 or 8, the gap becomes less and can cause a high bypass factor. What implications should be taken care while the no of rows is decided. Thanks in advance. Manu

Hi Experts, I have been into Chill based. There has some need into VRV. Would some expert please throw light on below. Do all VRV have indoor units having its electronic expansion valve? What are the options available? I have heard people using AHU along with VRV. How does that help when...

To Willard, Will there be a need for lead lined sheetrock, as there is no fear of radiation. Lead could lead to higher weight. And lead being a heavy metal.

Hi Experts, I was pondering over the selection of the chiller starter. I was tempting to with Soft starter as project specification gives option against Star-Delta. I have used Soft start for Air cooled versions uptill 500TR chiller capacity, multi compressor. But have a single compressor...

I thought about 1 inch thick rockwool acoustic lining all around the AHU shell. This when compared to lining around the room wall would reduce cost.

By function I don't believe VAV is completely equivalent to a Chill water PICV. The duct length connected to the VAV and the leak permeability would cause an issue unlike PICV.

Thanks Willard for the reply. Client is adamant of the noise. Hence was thinking about providing acoustic packing on the AHU skin, in addition to sound attenuators in return and supply. Believe rockwool fibre around the AHU body would make a difference. No idea on costing...

Hi Experts, There is a need to achieve 62db Pressure levels inside an AHU room that handle 150K CFM. Would sound attenutaor in the return line help or in the supply. Since the work is warm shell, the ducting and further work outside the AHU is not in scope. There is a mixing box planned hope...

Thanks to all of you. I am planning to keep PICV in the downstream of all major and load variable units, eg for PAHU and AHU. And a manual balancing valve in the main CHW line before that branches to feed AHU and rooms with PAHU. With refernce to HerrKaLeun's mention about VAV being an...

Hi Experts, PICV as the brochure is a combination of flow control that works to deliver the required chill water flow irrespective of upstream pressure pressure in the pipe line. When that is the case I believe there is no need to have double regulating valve or other control valves. As the...

Hi BronYrAur, I was verifying if there is a formula available that can calculate the positive pressure in a conditioned room if the treated fresh air quantity and exhaust air quantity are known. Thanks.

Thanks, the specific case was about the complete building that have AHU delivering treated fresh air into all buildings. The building is to be maintained at 8Pa static head generally. The leaks on the building periphery could carry some leaks. however to establish the static head of 8Pa...

Dear Experts, Is there any corelations available to calculate the static head developed in terms of Pascals for a given room when the supply and exhaust air flow rates are known. How to calculate the condensate that can be recovered over a year's period. The plan is to use the condensate as...

Thanks, Warmanga. The building is a office cum DC building in Middle east. I was also about to have a Heat recovery wheel at the terrace of this single floor building. The energy recovery can exchange cooling with exhaust and do a make up. However the system as per DBR is to be 100% fresh...