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Thank you SNORGY. Any other thoughts techies?

Hello everyone, * In a solar hot water closed loop project, I intend to run the vertical raisers (carrying the hot and cold heat transfer fluid)inside a chimney chase 3ft x 3ft. The chase runs vertically from the boiler room to the roof and is about 80 ft long. The problem is how to support the...

Hi, assuming yours is a typical residential DHW tank, I would suggest a 210F limit for temp. and 150psig for pressure. Please make sure all components in the system can withstand the above limits. Take a look at this valve: http://www.drillspot.com/products/326591/Watts_LLL100XL_TandP_Valve

That makes sense!! Thanks very much BigInch and vesselfab for the help.

Something to do with "Bulk Modulus" equation?

Hi all, please help with the below question. Consider a 300ft , Dia = 1-inch ID copper pipe closed loop system laid horizontally i.e., elevation = 0. To fill the system fully with water we would need: System Volume= (3.14/4)x(D^2)x 300' = 1.636 ft^3 = 12.24gal A pressure gauge in the loop...

Good point, they are Thermostatic mixing valves. http://www.plumbingsupply.com/thermostatic-mixing-valves.html Just curious, anybody worked with large size HW storage tanks for domestic or radiant-heat usages? I assume radiant systems run often into bacterial problems because of their...

Thanks, I have got MIX valves that should take care of any scalding issues....that is not a concern. I just don't want any bacterial infection on the potable HW tank and cause diarrhea to all the people in the 5-storey building :o

Thank you BigInch. Since this is a solar system, the temperature in the tank varies depending on the weather - lowest would be around 120 during winter months. Glad to hear that 120F is a safe number. Most part of the year, my tank temp. would be above 140F.

NY city water is chlorinated and the temperature in the tank will reach above 150F atleast once a day. The annual storage tank operating range is 120F to 175F. I guess this should minimize the chances of Legionella growth. Thank you PEDARRIN2, UNCLESYD and DAVEFITZ for the replies. Very...

Hi all, I'm designing a solar hot water system similar to the below layout. http://www.solarforce.com/files/45-0147_MSTR_large.jpg The storage tank is large - 1000gal and is supposed to store domestic hot water at 120-140F. Should I be concerned about any bacterial growth in the tank, though...

Thanks everyone for your replies. I have decided to go with 2 B&G PL-36 pumps in series. I should complete the installation next week and will let know how things went. Thanks again.

Thanks gepman. It is very difficult to find a small sized high head pump which can handle 6 gpm at 53 ft of head. Thats why I chose to use 2 pumps in series. Big cost difference as well.

TBP, unfortunately I can't pay around with the deltaT. It's kind of fixed 35-40F.

The operating temperature ranges 130-160F. Also, is it alright to install 2 centrifugal pumps one after the other i.e., adjacent to each other such that the discharge of pump1 is in contact with the suction side of pump2 ? thanks gepman and BigInch.

The B&G pump curves for PL-36 and PL-55 pumps below: http://www.bellgossett.com/productPages/Series-PL-2.gif

Hi all, I'm currently trying to fix a badly designed closed-loop Solar thermal system running at the below conditions: 3/4 inch, 'L'-type Copper piping(0.785" inside dia) Flow rate = 2.2 gpm Pressure head @ 2.2gpm = 28 ft of H2O Tiny Grundfos pump = UPS 15-58FC The system is running into...

Latexman & Artisi: Thanks a lot for the reply.

Hi all, this may be a trivial/dumb question. I have a simple, closed hydronic system of 2" pipe dia. with a SS tank in the loop. I'm trying to select a pump for this closed system. Tank dimensions = 16' length, 5' diameter System flow rate = 5 gpm System pressure = 12 psig The question is, how...

Hi IRStuff, a) Internal heat-ex arrangement costs $20,000(labor+material etc) compared to external heat-ex $8,000. Other issues with Internal heat-ex are chances of leaks, tank-buckling etc b) Prop. glycol cannot be used as the storage medium in the tank because it costs $15/gallon in USA. The...