Effect of temperature on hot water heating system
Increase in temperature in a hot water heating system produces numerous changes in the physical and chemical properties of water. Calgary water system has a hard water which is another extra bad effect on our water.
Pure water by chemical formula H2O contain oxygen; however, the water we use contains dissolved air, which is composed of nitrogen and oxygen. Anyway, the nitrogen is non-corrosive, but the oxygen present in the system can cause major problem. Oxygen react with metal. This reacts with metals causing pitting and gradual weakening of the metal surface. In fact, the oxides are deposited into the pipe system and clog the system. If we should use the metal pipe, the pipe must have a coat for against oxidation in particular of the heating system must be more careful when using the type of pipe.
Also not all the Pex (plastic pipe) will it be a proper choice for heating system pipe. It has to be oxygen barrier pipe.
Temperature effects the solubility of dissolved chemical in water. Temperatures above 60 C result in the setting out of temporary hardness that coats the pipe walls and heat transfer surfaces, resulting in a reduction in heat transmission.
Density and expansion
An increase in temperature produces a change in the density of water. One cubic meter of water in in 4 C has a mass of 1000 Kg,, but at 100 C the mass becomes 958 Kg. As the temperature increased molecular motion, increased volume. For this scientific reason a hot water tank must be protected against the volume increase inside of it. All hot water tank has a pressure and temperature relief valve. It is very good practice to test that valve every 6 month or at least every year.
For more information please visit us at: www.bbbplumbing.ca
or contact us at 587.433.3335