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Just wanted to second what energyprofessional said. A pressure reset or trim and respond routine is the way to go.

I have read through the IOM. But it didn't explain when to use entering vs leaving chilled water control. Was hoping to hear people's experience using one vs the other. @rputvin that article is super helpful thanks

Hi folks, I'm in the process or recommissioning a multistack heat recovery chiller Link The chiller wasn't commissioned/set up properly and hasn't run much since it was installed. I'm wondering if anyone could shine some light on entering vs leaving chilled water control? The chiller can be...

I see no issues with this.

Hi Neo, A few questions: Has there been a water audit done to see what the actual flow rate and pressure drop through the coil is compared to the original design? Do you have photos of how the coil is piped? Supply connection location/return connection location? How was the coil flushed...

The 3 way valves modulate to maintain a supply air temperature setpoint. The coil entering air will almost always be cooler than what the system was designed for, therefore without any means of control such as a 3 way valve you'll end up with air that's too cold leading to occupant complaints.

Unusual but doable. You got somewhere for the return connection as well?

I'm not familiar with the ASHRAE standard referenced but do have experience evaluating ACH rates. You should clarify if the ACH refers to ventilation rates or simply ACH (total supply air to the space). With regards to VAV's ramping down in response to load - the engineer will need to provide...

The photo doesn't open up properly on my phone. However I was able to make out the model number. A quick Google search didn't turn up anything. I recommend contacting Kawasaki here: https://www.khi.co.jp/corp/kte/EN/contact/index.html

Need more info. A model number or a name plate would help.

if its a winter application with a pan heater, you will unnecessarily waste energy because the non-operational tower will still have water in the basin which will need to be kept above freezing when the towers are off.

@pedarrin2 is incorrect. A btu meter consists of a flow meter and two temperature sensors, one temp sensor goes on to supply and one on to return. Since both supply and return flow are identical it doesn't matter where you install the btu meter. Just make sure you understand where in your piping...

In Canada, their was a recent announcement for implementation of an aggressive Carbon tax regime that'll make the cost of gas as a heat source more expensive than electricity. This is going to make owners/engineers take a closer look at non gas based heating/humidification technologies as well...

Other than cost - not really. SMACNA has guidance on duct reinforcement that you may want to look at and probably include in your duct construction specification.

On schematic 2, are you able to show the pumps and label the equipment to which flow is going to and coming from? Instead of the 3-way valve, you can just have the VFD ramp up/down to maintain 85c in the building loop.

To ensure hydraulic separation keep the distance between the inlet/outlet tees not more than 2 to 3 pipe diameters. The purpose is to have as small a pressure drop possible to prevent the flow in one loop affecting the other. see more here Is there a seperate pump for the heat recovery loop...

@bgtengineer Thanks! @PEDARRIN2 thanks for you your input, Do you know where I could find the storage VS generation ASHRAE charts? I am on the owners side now, back in my consulting days I had access to a spreadsheet that designers used for DHW load calculation. Being on the owners side I end...

Hi Johncooling, regarding the filter - you can install it in the ductwork upstream of the diffusers, so that takes care of that. Regarding the air velocity - you are looking for the throw/drop from the diffusers. I don't have the answer but I bet there is some useful info here especially in...

Thanks LittleInch, always appreciate the input - do you size DHW systems? Any recommendations for sizing guides?

I am concerned that you wouldn't get adequate mixing in the room. what if you ran ducts along the sides and installed slot diffusers, something like thisLink Also your return is at the bottom, we typically install return grilles higher in the room, as fresh cold air is more dense and hangs...