What are the flow rate and water temperature standards for heating provided by heating companies?

The flow rate of heat supplied by the heating company should be 0.25m/s, the water supply temperature should be 35-50℃ and should not exceed 60℃, and the temperature difference between the supply and return water should be less than or equal to 10℃.

According to the national standard JGJ142-2004 "Technical Regulations for Ground Radiant Heating":

Article 3.1.1 The supply and return water temperatures of the low-temperature hot water ground radiant heating system should be Calculate OK. The water supply temperature for civil buildings should be 35-50°C and should not exceed 60°C. The temperature difference between the supply and return water should be less than or equal to 10°C.

Article 3.5.6 The flow rate of water in the heating tube should not be less than 0.25m/s.

Extended information:

Indoor heating temperature:

According to the provisions of Table 1 in the national standard GB/T18883-2002 "Indoor Air Quality Standard", civil buildings The calculated indoor temperature of the main room is between 16°C and 24°C. The indoor temperature that meets this standard is a comfortable indoor temperature.

Meteorologically, the average climate temperature of 10-22℃ is defined as spring, and the average temperature is 16℃, so 17℃ is close to the theoretical median and represents the temperature of spring. If the heating temperature is higher than 22°C, the heating temperature in winter will be too high, which will make the indoor air abnormally dry, making people feel hot all over, and the eyes, ears, mouth, nose, throat, skin, etc. will feel dry.

If the heating temperature is as low as 10°C and you cannot feel the warmth, and it is as cold as winter, it is naturally not the basic purpose of heating. Therefore, from a temperature perspective, 18°C ??is closer to the physiological needs of the human body. Therefore, in winter, it is appropriate to keep the indoor temperature at 18°C ??to 22°C.

Baidu Encyclopedia-Technical Regulations for Ground Radiant Heating

Baidu Encyclopedia-Indoor Air Quality Standards