Flow And Return Temperatures For Condensing Boilers

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Ideally you want to keep it condensing for longer for energy efficiency So the way that I always do it when setting up a new system or balancing an existing system is. You can probably range rate.

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Optimal regulation of the shunt pump is achieved by system sensors monitoring supply water temperature TF and return water temperature TR.

Flow and return temperatures for condensing boilers. Many are set up with a flow and return temperature of 70 degrees. Legionnaires is a form of pneumonia thats caused by bacteria in water. In other words the water in the return pipe needs to be 55C or lower or your boiler.

For natural gas boilers the dew point is around 55C. Thus a condensing boiler will be more efficient if it is coupled with water-based underfloor heating with the flow temperature of 40 to 45 degrees Celsius. In fact research commissioned by Viessmann and conducted independently by the University of Salford recently found that connecting a boiler to weather compensation controls will reduce energy consumption by 15 when the outside temperature is 3C by 31 when it is 8C outdoors and by 45 when it is 12C outside due to having lower return.

Potterton can be switched between two flow temperatures such as 63 C 145 F and 84 C 183 F only the former being fully condensing. This is the temperature at which water droplets form. Im not an expert but according toWorcester Bosch their condensing boilers are designed to have a 20C difference between flow and return as against 11C for non condensing.

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In summary for optimal operation condensing boiler systems need the return water temperatures well below the dew point of the boiler exhaust for natural gas this is around 140F in the Bay Area and 125F in Denver ideally around 80F or lower. Add the differential across the flow and return onto the 55 degrees. Since there is no recommended minimum temperature for the coolant a boiler that is connected to an underfloor heating system can work without special temperature-lowering devices.

Little information could be found on recommended design practices for condensing boiler. You should set the temperature between 60 and 65 C but for maximum efficiency it should be set to around 60 C. And for the boiler to work in condensing mode I believe its correct to say that the return temp must be around 50-55C therefore the flow temp would need to be aprox 70-75C.

Non-condensing boiler systems require the return water temperatures to be above the dew point of the boiler exhaust hence the warm-up loops. The dew point is at 55 degrees and for the boiler to condense the temperature of the water that returns to the boiler must be 55 degrees or below. Natural Resources Canada also suggests ways to make better use of these boilers such as combining space and water heating systems.

A shunt in a conventional boiler keeps the return water temperature above the flue gas dew point avoiding corrosion and thermal shock. Most condensing boilers condense for longer when the return temp is around 55 degrees. This can be achieved by setting the flow temperature to about 75 degrees then balancing the system to achieve a.

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Do not set it lower than this as you could increase the risk of contracting Legionnaires disease. By allowing the temperature of the return water to go below roughly 130 F this causes moisture to condense out of the flue gas. Conversely the focus for condensing boiler system design is to return 80F 27C water to the boilers to promote maximum boiler efficiency.

Not return water cooler than 140F 60C in order to prevent condensation of corrosive flue gases within the boilers. If using a boiler with maximum 20C differential the flow temperature would be reduced to 70C to allow 50C return enabling condensing operation the heat up times for hot water would be longer or the heat transfer area would have to be greater to deliver the same performance. Today the temperature difference between the hot water supply and return temperatures should be between 30F and 50F which decreases system flow rates reduces pressure drops through heating coils and terminal units and results in less system pumping power at full-load and part-load conditions.

For the boiler to go into condensing mode the temperature of the return as it enters the boiler should be no more. Basically condensing boilers are designed to take advantage of the latent energy available in the exhaust flue gasses.

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