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Good catch. FPS is correct.

I'm trying to calculate the thrust load on a 3" HPS elbow, Sch. 80, welded construction, for an underground direct-bury application. I don't typically work with steam, so I'd like a check of my numbers. This is a 3" branch pipe off an 8" HPS main at 175 PSIG. Design velocity is 5000 FPS. The...

We are renovating an existing greenhouse. The researchers moving into this renovated space require evaporative cooling. This greenhouse, which is divided into two 20' x 33' sections, will have a very short pad-to-fan distance (side wall to opposite side wall). Both ASHRAE and the Nat...

I'm working on a revision to a dean's office at a local campus. The main air handler is a CV unit with no excess capacity. The new office layout will require additional cooling airflow than originally designed. What are my options to improve this situation? A fan-powered box would draw warm...

I am a new facilities engineer at a local university. We have a system (designed by an outside consultant) that uses flow control valves on VAV fume hoods. The hoods are used extensively for acid digestion (boiling off hydrochloric acid, hydrofluoric acid, nitric acid, OR hydrogen peroxide)...

I recently started a new job, where the AutoCAD software defaults to "AutoCAD Architecture" instead of the plain vanilla AutoCAD (v. 2012). As I am a mechanical engineer and not an architect, I prefer the familiarity of the basic AutoCAD layout. I discovered by selecting OPTIONS -> PROFILES...

Thanks, guys. This is a military application where they fill a truck tank to 3000 PSI which runs operations on that vehicle. I think the 5000 PSI requirement includes a safety factor. The only guideline I've found lists stainless or copper-nickel pipe. I'm really curious if I can get by with...

I have a client who wants to run a 5000 PSI compressed air line around the perimeter of a shop. Airflow of 50 CFM max are expected. Can anyone direct me as to what materials may be suitable? I'm looking at a 1" Sched. 80 welded steel pipe, but I wanted to check other options. Are...

There is actually much information about these systems online. One source I would suggest is the McQuary Geothermal Heat Pump Design manual. It includes a section on boreholes and overall system design.

Your first step in an actual geothermal project should be to have a geothermal test bore drilled at the site and then have a formation thermal conductivity test performed for approximately 48 hours This will provide: 1. the formation thermal conductivity, 2. the formation thermal diffusivity...

Thanks. Looks like I'd better go with FRP for the ductwork AND the outlet louver. -Brad

You may also want to visit http://www.apc.com and browse the section entitled, "White Papers for Cooling Solutions". They have lots of good information. HTH, Brad

The Carrier just released a newer version of the HAP software that is geared toward LEED analysis and reporting. TRANE Trace also has that functionality and is more robust. For a small firm, the HAP software is more-reasonably priced and should serve your purpose. HTH, Brad

I am designing an exhaust system for a small room (~400SF) containing a closed, dilute sulfuric acid system. Airflow is approx. 6 ACH. Is galvanized (w/high-performance paint) the cheapest option, or would a plastic duct be more chemically resistant?

I just completed an HVAC design for a rural healthcare facility. In the absence of state codes and specific guidelines in 62.1, I used the Health Care Facilities guidance (ch. 7) in the 2007 ASHRAE Applications Handbook. 62.1 provided for baseline OA rates, but ASHRAE Applications, Ch. 7...

Ed, You may also want to check out "HVAC Simplified", by Kavanaugh. It provides a good overview of the basics AND comes with a CD containing of functional spreadsheets. It is available through the ASHRAE website.

I am running TRACE 700 v6.0 and am struggling to meet the ASHRAE 62.1 outside air (OA) values within my heating outputs. To correctly set the OA values, I have input the COOLING & HEATING ventilation values as the min OA values calculated using 62.1(from the CREATE ROOMS:AIRFLOWS tab). The VAV...

Here's an easy one for a Friday... Can anyone tell me what the "ci" used in Table 5.5-4 means as listed after insulation R-values for Mass Walls, Above Grade? Thanks in advance.

Also see the ACGIH Industrial Ventilation Handbook. It has very detailed informationr regarding exhaust system design.

Montemayor, If you are willing, can you post/send an example of one of your "simple" CA piping spreadsheets? I am looking for some pipe system sizing examples for a basic design. Thanks in advance!