Category Archives: Boilers

How Does an Expansion Tank Work? HVAC Hydronics

how does an expansion tank works.

The difference between a steel expansion tank and a bladder type expansion tank.

Expansion Tank Basics – Types

What is an expansion and how does it work? I get that question all the time even though I have written an extensive article on expansion tanks.  The two most common expansion tanks you will see in HVAC applications include the bladder type expansion tank and the steel type expansion tank.  The steel type expansion tank needs some basic maintenance from time to time to ensure it doesn’t become waterlogged or overfilled which would defeat the purpose of having an expansion tank. For more on the basic maintenance of a steel expansion tank and how to properly fill it check out this article.

How Does an Expansion Tank Work

How does an expansion tank work and why do you need one in your boiler or chilled water system? If you have a hot water boiler system (not a low pressure steam boiler – there is a huge difference between the two) or a chilled water system (not many chilled water systems in residential but I have seen them) then you have a closed loop piping system that runs to either convectors, radiators, or a coil or two somewhere in the system where the main heat exchange process takes place. Inside this piping is water (sometimes a water/glycol mix but that is mainly in commercial applications) and when water heats and cools down it expands and contracts. The piping system along with the parts of the boiler or chiller that have water cannot handle this expansion and contraction with breaking or busting open. Therefore in every hydronic system there is an expansion tank to handle this expansion and contraction. An expansion tank is basically a shock absorber that absorbs this expansion and contraction of the volume of the water.

High Performance HVAC Air Conditioning and Heating Systems

How Does an Expansion Tank Work

 

Automatic Vent Dampers | HVAC Energy Efficiency

Automatic Vent Dampers | HVAC Energy Efficiency

Single wall flue vent used on an atmospheric boiler.

Single wall flue vent used on an atmospheric boiler.

Everyone wants to get the most out of their equipment whether it be for heating and cooling or anything else. If we can save a few bucks every month then its good we saved that money and energy for the future. This article is applicable to those people with gas or oil furnaces, gas or oil boilers, and or gas or oil fired water heaters. Basically any appliance that burns fossil fuels and has a flue through a vent or a chimney this article is applicable to you and can save you money by saving energy. 

Read more ...

Boiler Commissioning & Functional Testing – Quality Assurance

Boiler Commissioning & Functional Testing – Quality Assurance

Boiler Commissioning & Functional Testing - Quality AssuranceBoiler Commissioning & Functional Testing – Commissioning (Cx) any type of HVAC equipment is many different procedures from the beginning of the commissioning process to the end of the process. One of the most important procedures during the Cx process is functional testing. The functional testing always precedes the final testing where a test of all the combined equipment is done in an integrated systems testing. Once successful testing is completed and all discrepancies corrected a final commissioning report is generated including all the test data and information collected during the entire process of testing and commissioning.

Read more ...

Boiler Circulation Problems | Troubleshooting Hydronic Water Loops

Boiler Circulation Problems | Troubleshooting Hydronic Water Loops

Boiler Circulation Problems | Troubleshooting Hydronic Water Loops – Richard, we have a hot water boiler and we are having problems with the circulation of the water. The radiators are cool and we don’t seem to have good heat. The boiler seems to be working fine but the radiators are cool. Can you give me some insight into my boiler circulation problem? Kate

Boiler Circulation Problems | Troubleshooting Hydronic Water Loops

Read more ...

Pressure Reducer Valves for Hydronics – Heating & Cooling Water

Pressure Reducer Valves pressure reducer valve and backflow preventer

Pressure Reducer – Blue Arrow & Backflow Preventer – Red Arrow

Pressure Reducer Valves for Hydronics

Pressure Reducer Valves are used for boilers to decrease the pressure supplied to the boiler from the  make-up water feed. The make-up water feed originates from the city water source or well water source. The same water source you use for showering, washing dishes, and sometimes drinking water depending on the quality. In many case the pressure reducer valve or PRV is set to 12 PSI on most boilers. This is the pressure needed for many residential and commercial boiler water loops.

Pressure Reducer Valves and Make-up Water

In most cases, the make-up water supply is 40 or 50 psi and higher and this will exceed the safety rating of the lower pressure requirements of the boiler water loop. It will also exceed the pressure rating on the pressure relief valve on most residential boilers. For this reason a PRV or pressure reducer valve is needed to decrease the pressure supplied to boiler.

Read more ...

Search

SATURDAY, NOVEMBER 22, 2014

Login Form