The outdoor air required must equal the exhaust air plus the air required to pressurize the space. This would be more than that required for ventilation. You can not reintroduce exhaust air into the space. You need to add DX cooling coil to the makeup air system and introduce some of the supply...
Ok then if the 3rd loop really turns out to the the run resulting in highest pressure drop then the differential pressure setpoint will be the pressure drop through the piping, fittings, equipment and valves through the 3rd branch loop. For balancing all equipment should have combination...
You have to break off piping loops to not exceed pipe equipment pressure rating by using separate heat exchanger for each loop. Allow for approach temperature difference between fluids and always design for counterflow.
You have to understand that for a ductwork system to be balanced to design flows the air pressure drop to each diffuser must match the pressure drop to the most remote diffuser. Note the fan discharge pressure must be dissipated to zero which is the pressure at each air outlet. So plan on...
Are you sure the heat from the exhaust air in not recycled by it passing through the approximate half of the desiccant enthalpy wheels while outdoor air for the intake air blower goes through the other half of the wheels thereby absorbing the heat from the exhaust air as the wheels rotate? There...
You need to have fire damper, access door, and volume dampers to create pressure drop such that the pressure drop here can equal the pressure drop from the main to the worst run of ductwork so flows can be balanced to design values. So fogure on FD w/ AD then Y split and total 4 branches spaced...
Moideem you are confusing a pressure regulating valve for a differential pressure sensor. The pressure regulating valve is not used to control AFD pumps.
Instead of coming up with a formula why not sort all the rows and column with ascending X value then the the left and right hand part number and their location number will be displayed next to each other. If you are looking for a specific value in a particular column you can make it easier to...
First off the location of the differential pressure is wrong. The high and low pressure sensor of the DPS are located at the same pressure point so here is no differential. Second you should delete the end of the loop connection because you are just providing a bypass that would negate the use...
To be ok the following must be met: the NPSH at the pump inlet must be greater than the pump minimum NPSH requirement; air in the piping must be automatically vented by automatic air vents located at all high points of piping; the expansion tank initial pressure must be set such that minimum 10...
There should be a strainer on the HWS piping upstream of the coils. There should be a manual air vent valve at the top of each coil and automatic air vents at the high point of the HWS and the HWR piping above the coils. There should have been plugged tees at each coil offset HWS and HWR piping...
I have run across this. Now in normal HVAC design the space is pressurized with conditioned outdoor air at about 0.5 CFM/SF to prevent infiltration of outdoor air. The condensation is caused by infiltration of outdoor air which is caused by 2 things. First there is a crack or opening that lets...
How about using filters in parallel valved manifold and differential pressure gauges so you can shut and replace one while the other is in service. Consult filter manufacturer to determine size and filtration capability.
The filter is for the air supply going into the room. The condenser coil (or cooling coil in reversed heat pump operation) discharges air to the outdoors so it is not filtered.
