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  • Users: cdxx139
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  1. cdxx139

    Heat gain of AC pump motor vs DC

    Hello Electrical Engineers, We are changing out 3 600 HP DC motor pumps and changing them over to AC. My job is to provide the cooling in the room for this massive heat gain, which comes out to about 500,000 Btu/hr, which may require a 50 ton chiller @ 1.2 kW/ton is 60 kW. The existing pump...
  2. cdxx139

    Temperature sensors in a digester with mixer to control the boiler

    Hello, I am trying to determine how to control the boilers for a Primary/Secondary digester building. The new mixers being installed do not allow temperature sensors, so we will locate them. Does anybody have suggestions or references they can point me at? The location should be below the...
  3. cdxx139

    Check kitchen duct gauge in field

    I am looking at an existing kitchen duct system and client is looking to replace the fan. Any tricks to checking the thickness of the duct guage to see if it meets current code? I assume a caliper, but if its a built system, so where can I measure? I found digital ultrasonic material...
  4. cdxx139

    conduction from under water

    http://www.eng-tips.com/viewthread.cfm?qid=388496 Hi I am cross posting from HVAC from the advice of a fellow engineer. I am looking to calculate the heat loss of a dry dock in water to heat the inside the dry dock, when the OAT = 25 degF, the water is 50 degF and indoor conditions are to be...
  5. cdxx139

    conduction from under water

    Looking to do a heat loss through the steel hull of a dry dock. Half is under seawater. The water temp is 50 degF and the OA is 25 degF and indoor conditions being 60degF. SO I did a typical UAdT equation for both above water and underwater sections. U of steel being 1.2 and dT for above...
  6. cdxx139

    Organize HVAC Details

    I am organizing our firms Details, standard and sequences etc. And am currently tackling the Standard Details and adding to them as needed. My question is organization. We currently have 13 different categories, and I was told they are done per AIA guidelines, which I have not been able to...
  7. cdxx139

    Drawing Duct UP/DN notation

    Looking for people's opinion (or a standard) on how you would note duct (or pipe) going through a floor in plan view. Specific example: 2 story building. AHU on roof, space being served is on the first floor. The drawing I am notating is at the 2nd level, where a transition happens for 1st...
  8. cdxx139

    Drawing Duct UP/DN notation

    I feel like this is a silly question, but want to get people's opinion on how you would note duct (or pipe) going through a floor. I will provide a scenerio, and I would appreciate if you respond how you would note it on a drawing. Specific example: 2 story building. AHU on roof, space being...
  9. cdxx139

    Using PVC for condensing boiler venting. Will it melt?

    Has anyone dealt with the issue of using PVC (or CPVC) for a condensing boiler flue vs AL29-4C S/S? Almost every boiler manufacturer IOM allows PVC, CPVC or S/S flue material. I specified S/S venting and the contractor came back and wanted to install PVC, I rejected it, and it started this...
  10. cdxx139

    CHW Demand Reduction Sequence

    Hello, I have CHW campus loop (4 chillers), that would like to shutdown one chiller during the highest power demand load (design days, when everyone has an AC going and the grid needs as much power as possible). Since my client is a big power client as well, they are trying to do their part, by...
  11. cdxx139

    Primary Secondary w bull headed tee

    I have an installed Primary Secondary Hot Water system. Attached is a diagram. Upper portion shows how the boiler manufacturer recommends the piping be installed, and the Lower portion shows how it is actually installed. The complaint is the boilers are not recovering in time on morning...
  12. cdxx139

    VAV ERU w/ CV bathroom exhaust

    Hello, I have a high-rise art school project that I am designing using a four pipe Fan Coil Unit with primary air system from a Dedicated Outdoor Air System (100% outdoor air unit w Energy Recovery wheel) To meet LEED Silver, a point requires CO2 sensors in high density occupant spaces. The...
  13. cdxx139

    Low suction pressure issues

    Looking for some refrigeration help. I have a variable condenser water system, that I need to run temporarily as constant volume. (The VFD is not coming in for another 4-6 weeks). It is a condenser water with a cooling tower, and serves water-cooled condensers for freezers, and also water...
  14. cdxx139

    90.1 Efficiencies

    Now that our energy code adopted the 90.1-2004 as a part of the energy code, how do people stste the minimum efficiency for a piece of equipment. Do you put the minimum efficiency of the equipment on the schedule sheet or the minimum efficiency allowed by 90.1? Or is the specification the best...
  15. cdxx139

    Access Max of different columns

    Hello, I am a somewhat beginner Access use. I am writing an Access databse for room data for a hospital HVAC project (and template for future projects). I am comparing cfm from the load of the space, ventilation required by code, ACH requirements per AIA, and Dept of Public Health ACH...
  16. cdxx139

    Access visual relationship guide

    I hope this is the acceptable location for this question. My last question here had some great debates and excellent feedback. To continue from the "Organizing Files" thread, I have decided to go the Access database route. My question is: Is there a software I could use to help explain the...
  17. cdxx139

    Indoor Firing Range

    I have the unusual task of designing an HVAC system for an indoor firing range (well unusual for me). I did a search and arabei gave seme good lead safety info but that was back in 02 and seeing if assitional input can be provided. I researched ASHRAE, and they do not have anything in their 4...
  18. cdxx139

    Organizing files

    Any suggestions on how to organize excel calculations? I am an HVAC engineer and try to make as many as I can, but have trouble reusing them on future projects, like a template. It seems every job, I start from scratch. I do computer calcs to get organized and be faster, save budget and make...

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