It seems reasonable, you have a high static pressure, so your bhp per cfm is a little higher and the associate temperature rise matches that. The entire motor load is included, but the heat may not be realized immediately, as some of the heat gain will be due to friction through the duct. At...
Use a small HRV to ventilate the training room and condition it with ductless split units. If you are putting some air in from RTU-1, you run the risk of poor temperature control or duelling thermostats.
Check to see if your return air and outside air temperature are similar. If they are then there will be no benefit in cooling mode. The exhaust is assumed to match either the ventilation load or the sum of the zone direct exhaust volumes.
I have reviewed building installations from the 60s that used absorption chilling machines. One was designed around its own source of natural gas that was used for the electric generator and the steam boiler, the steam was in turn used for the absorption chiller. The whole building essentially...
Is this a process boiler application or heating boiler? If the latter does the load drop when the out door air temperature is warmer? Can you use a reduced load for the jacket losses from the boiler?
Can you insulate the boiler jacket more to reduce losses?
The condenser water reheat coils can work well, for sub-zoning or better temperature control with dehumidification. Taking the water right after the heat pump can be used to reheat or recool the air depending on what mode the heat pump is running in. Since you are not using additional energy...
You should likely review ASHRAE 62 and determine if transfering the air reduces the classification of the space. If it is a concern, another option may be to provide a return fan ducted from the south offices to the north plenum, avoiding tranfer through the open office.
If you had a...
No return; then limited airflow when the door is closed and potential whistling through cracks (depending on the available static pressure from the fan). We put acoustically lined transfer elbows at high level with a grille on the outside wall (to the open office)
What is your experience with bulk pricing of tender packages by HVAC equipment suppliers?
The supplier can provide equipment considered equal to that specified, some of the products may be more expensive, some less expensive, but they give the contractors one lump number for everything such...
There are other models of heat pumps that are designed for closets or corner installations for condos/apartments. An example can be found at http://www.skymarkinternational.com/images/resources/166.pdf
(I have no knowledge of this manufacturer, but the units are pretty common)
You can also get equipment design information from the McQuay website. They have a number of different design manuals that can be downloaded.
A key item would be the Honeywell Engineering Manual of Automatic Controls for Buildings. Ask a local rep for a copy or you may be able to download a...
Too bad, I was in the neighborhood at Holiday Hills last summer.
Usually, the ahu's are selected to provide a 55°F discharge air temperature to provide a 75°F 50% RH condition in the space.
Has the space changed over the years?
Are they leaving the door open?
Is the coil in the AHU dirty...
I would also think that your system design would have some impact on the decisions. If you have decent zone control in this large house then account for the peak for each space. (This is almost small commercial). If the zones are individually thermostatically controlled and your system can...
Also note that some newer technology compressors will modulate to match the load. So slightly oversizing the unit may not have any bearing on the dehumidification capacity of the unit.
If the compressor is on-off and oversized for the load it will run, overcool the space, and shut off until...
The airflow required to cool the space, assuming 100% outdoor air is as per the equation noted by willard3. You can modulate the outside air flow based on outdoor air conditions.
For me it depends on the project and the required accuracy. There may be some installations that have critical flow requirements that would need detailed analysis.
A commercial building may just need to be +/- 5%. The airflow with a DX system if it is out will adjust the discharge...
I agree that the decoupler is required.
The booster pumps look fine to me, they just maintain a maximum make-up water pressure to the system when the city water supply does not have the necessary pressure.
The issue is with the control and sequencing of the chiller staging and the flow from...
