How to Design Floor Heating System with Valves Involved?

The floor heating system is a heating method that supplies heat to the room through the ground by means of radiant and convective heat transfer, which uses hot water with a temperature of less than 60 ° C as a heat medium in a heating tube buried in the filling layer below the ground Circulates to heat the entire floor. In recent years, with the widespread use of gas-fired heating water heaters in the heating market and the emergence of a number of high-quality floor heating pipes, the combination of wall- hung boilers and floor heating is popular among users for its safety, comfort, energy saving, environmental protection, and beauty, and moreover, it gradually becomes a trend. As the power source of the entire floor heating system, the irrational circulating water pump will not only Bring about water imbalance, and will give rise to make the pump deviate from the optimal working point, and consequently, the efficiency of the floor heating system decreases and power consumption increases, which directly affects the comfort of heating. As one of the components of the circulating water pump, the fitting also plays an important role.

Selection Methods of Circulating Water Pump

The general method of circulating pump selection is based on the results of hydraulic calculations to obtain the water flow required by the floor heating system and the head required to overcome the resistance of the pipe network of the floor heating system and the wall-hung boiler itself. As a consequence, the selection of a suitable circulating water pump requires comprehensive consideration of the working efficiency of the circulating water pump in the floor heating system.

Selection Conditions of Circulating Water Pump

① Households should choose the most favorable loop of the floor heating system to calculate the system flow. The maximum flow that the circulating pump can provide should be more than the water flow of the most favorable loop of the system.

② Residents are recommended to select the most unfavorable loop of the floor heating system to calculate the system resistance. The maximum head that the circulating pump can provide should be greater than the system resistance of the most unfavorable loop of the system.

③In the case of satisfying the water flow and system resistance, the residents need to consider the working efficiency of the circulating water pump, and try to make the circulating water pump work in the highest efficiency range or close to the highest efficiency range.

④ The water flow rate in the floor heating pipeline should not be less than 0.25 meters per second and greater than 0.8 meters per second. However, it is considered that as the pipeline usage time increases, the resistance will increase accordingly. Therefore, at the beginning of the design, the design work point should be properly shifted to the right.

As an important part of the floor heating system, the floor heating pipe fitting is hidden and installed under the floor for a long time. If there are problems such as bursting and poor thermal effect, it is very troublesome to repair. Therefore, during the laying of the floor heating pipe fittings, additional attention needs to be paid to the material and service life of the heating pipe fittings.