Search results for query: *

Anti-freeze? I have a link below, on Dow-Frost GEO 20. You can get the thermal properties of GEO-20 anti-freeze/water mix from the brochure in the link. Don't use standard automotive anti-freeze, use an anti-freeze formulated for "geo" and/or HVAC applications. Read Dow's literature to...

In my most recent post, I failed to note a link included to a PDF that contains, among other things, an explanation of "Heat of Rejection."

To answer prichmon's question: what is the Heat of Rejection? Suppose you calculate the Total Cooling Load (sensible + latent) of an office space at 10 Tons. You might think that you only have to size the "heat sink" (whether a cooling tower or an array of boreholes) to accept 10 Tons. But...

prichmon, you probably should have posted this to the HVAC/R forum. Anyway, be wary of rejecting heat into the ground 24/7. If you have ZERO heating load, you'll never have to extract any heat from the ground. When you reject heat 24/7 into the ground, the "borehole field" gets "saturated."...

OK, here are some thoughts: I assume your 273,000 BTUH includes all the Heat of Rejection from the refrigeration equipment. Tons = 273,000 BTUH) / (12,000 BTUH/Ton) = 23 Tons to be rejected to the ground. Borehole Depth: I use a 180 foot deep vertical borehole to reject each Ton. By "Ton"...

The original post says: 35*F differential equates to 1,315 feet of copper pipe, at "total power usage" of 80 KW. My question: what BTU per hour are you trying to reject into the ground? Is it (80 KW x 3413) = 273,040 BTU/hour?

In my State, Pennsylvania, boiler installations must comply with ASME Standard CSD-1-2004, which is titled: "Controls & Safety Devices for Automatically Fired Boilers." Paragraph CE-100(a), in ASME CSD-1-2004, says it this way: "A manually operated remote shutdown switch ...... shall be...

ivoryhorseman: possible typo in your post? If the radius is 20 cm, then diameter = 40 cm, or 15.7 inches. But you said the wall thickness was 50 cm (= 19.6 inches ?) I'm lost. Anyway, just to get you "in the ballpark", you might try a few possibilities out at the attached site. Also, as...

You say this is your first water system design. You should get the book "Cameron Hydraulic Data." The first chapter is an excellent treatment of pump inlet/outlet conditions, lift, suction lift, NPSHA, etc. The book is essential for anybody who designs piping and selects pumps. Good luck...

Guys, on 3 July I posted 2 pages from the ASME Elevator Code.

A smoke detector is required in the hoistway, IF there is a sprinkler head in the hoistway. BUT, per the 2007 edition of NFPA 13, you can OMIT the hoistway sprinkler under certain conditions. Paragraph 8.15.5.5 of the 2007 edition of NFPA 13 tells you how to omit the hoistway sprinkler. I...

I attached 2 pages from the second Addenda to ASME A17.1b-2003, relating to smoke detectors in the hoistway.http://files.engineering.com/getfile.aspx?folder=136d42dc-e6e4-445a-bb0a-67e829e2401f&file=Elevator_Smokes_per_ASME_A17-1b-2003.pdf

I will quote from a very "old" (2002 edition) NFPA 72 National Fire Alarm Code: Chapter 6 Protected Premises Fire Alarm Systems. 6.15.3 Elevator Recall for Fire Fighter's Service. 6.15.3.6 Smoke Detectors shall not be installed in un-sprinklered elevator hoistways unless they are installed...

You should do this work under the direction of an experienced Engineer. Nobody can simply give the "know-how" to you. You have to study. I suggest reading the Bussmann publications on fault calculations. See the link...

You might try AAON. I can't guarantee they have horizontal discharge & 480 Volt. But I can tell you that AAON does offer just about any configuration & option you can imagine. Here is a link:http://www.aaon.com/product.aspx?id=1

You might check out the NPSH discussion in the first chapter of the Cameron Hydraulic Data Book. The book is a classic. Still available for approx $60.

It sound like you don't routinely estimate HVAC loads. Some comments ...... ACCA Manual 'J' is for residential loads - not applicable. You could use the ACCA Manual 'N' procedure for commercial buildings. But, you would have to buy the Manual 'N' book from ACCA. It is an excellent...

When you have calculated all your loads, you'll have to select the equipment with adequate SENSIBLE capacity. Typically in a server room, almost all the cooling load will be sensible (no people = no latent load). So, when you select your cooling equipment, make sure you select something that...

You have to run an energy model. Or, you could (gasp!!!) actually do a quick manual load calc. "Rules of Thumb" like SF/Ton are dangerous. Non-engineers are always looking for Rules of Thumb. That's why they're dangerous: because non-engineers use them (improperly).

Don't look for "Rules of Thumb." What are your flow requirements? Sprinkler = _?___ GPM. Domestic = __?__ GPM? If you're combining Spkr & Domestic in the same lateral (check with your AHJ), then: Total Flow = Spkr + Domestic. Select a lateral pipe size that gives a reasonable velocity at...