【Daily Discussion】Utilities - HVAC - 20200806

When in operation or shut down, hot water heating systems must meet the following requirement: within the user systems that are directly connected to the hot water network, the pressure shall not exceed the pressure tolerance of the heating equipment and piping components in those user systems. In high-temperature water networks and user systems, at locations where the water temperature exceeds 100°C, the pressure of the heat transfer fluid should not be lower than the vaporization pressure at that temperature. In user systems directly connected to the hot water network, whether the circulation pump is running or not, the pressure at the outlet of the return pipe in the user system must be higher than the water level in that system, in order to prevent the system from emptying out and drawing in air, which could disrupt normal operation and cause pipe corrosion. The pressure at any point within the network return pipe should be at least 5 mH2O higher than atmospheric pressure to prevent air from being drawn in. At the heat station of the hot water network or at the user connection point, the operating pressure of the supply and return pipes must meet the head pressure required by the heat station or the user.

Answer: Hot water heating systems must meet the following requirements when in operation or shut down: 1. In user systems that are directly connected to the hot water network, the pressure should not exceed the pressure tolerance of the heating equipment and piping components in those user systems. /2. In high-temperature water networks and user systems, at locations where the water temperature exceeds 100°C, the pressure of the heat transfer fluid should not be lower than its vaporization pressure at that temperature. In user systems directly connected to a hot water network, whether the circulation pump is running or not, the pressure at the outlet of the return pipe in the user system must be higher than the water level in that system, in order to prevent the system from emptying out and allowing air to enter, which could disrupt normal operation and cause corrosion of the pipes. The pressure at any point within the network return pipe should be at least 5 mH2O higher than atmospheric pressure to prevent air from being drawn in. At the heat station of the hot water network or at the user connection point, the operating pressure of the supply and return pipes must meet the head pressure required by the heat station or the user.

(1) No overpressure. (2) No vaporization. (3) No emptying. (4) Provide the user with sufficient supply pressure. (5) The pressure at any point in the return pipe of the hot water network must be at least 50 KPa higher than atmospheric pressure to prevent air from being drawn in.

(1) No overpressure (2) No vaporization (3) No emptying (4) Provide the user with sufficient supply pressure (5) The pressure at any point in the return pipe of the hot water network should be at least 50 KPa higher than atmospheric pressure to prevent air from being drawn in

Hot water heating systems must meet the following requirements when in operation or shut down: within the user systems connected directly to the hot water network, the pressure shall not exceed the pressure tolerance of the heating equipment and piping components in those user systems. In high-temperature water networks and user systems, at locations where the water temperature exceeds 100°C, the pressure of the heat transfer fluid should not be lower than the vaporization pressure at that temperature. In user systems directly connected to the hot water network, whether the circulation pump is running or not, the pressure at the outlet of the return pipe in the user system must be higher than the water level in that system, in order to prevent the system from emptying out and drawing in air, which could disrupt normal operation and cause pipe corrosion. The pressure at any point within the network return pipe should be at least 5 mH2O higher than atmospheric pressure to prevent air from being drawn in. At the heat station of the hot water network or at the user connection point, the operating pressure of the supply and return pipes must meet the head pressure required by the heat station or the user.

(1) No overpressure (2) No vaporization (3) No emptying (4) Provide the user with sufficient supply pressure (5) The pressure at any point in the return pipe of the hot water network should be at least 50 KPa higher than atmospheric pressure to prevent air from being drawn in

(1) No overpressure (2) No vaporization (3) No emptying (4) Provide the user with sufficient supply pressure (5) The pressure at any point in the return pipe of the hot water network should be at least 50 KPa higher than atmospheric pressure to prevent air from being drawn in

(1) No overpressure (2) No vaporization (3) No emptying (4) Provide the user with sufficient operating pressure (5) The pressure at any point in the return pipe of the hot water network should be at least 50 KPa higher than atmospheric pressure to prevent air from being drawn in

(1) No overpressure. (2) No vaporization. (3) No emptying. (4) Provide the user with sufficient supply pressure. (5) The pressure at any point in the return pipe of the hot water network must be at least 50 KPa higher than atmospheric pressure to prevent air from being drawn in.

When in operation or shut down, hot water heating systems must meet the following requirement: within the user systems that are directly connected to the hot water network, the pressure shall not exceed the pressure tolerance of the heating equipment and piping components in those user systems. In high-temperature water networks and user systems, at locations where the water temperature exceeds 100°C, the pressure of the heat transfer fluid should not be lower than the vaporization pressure at that temperature. In user systems directly connected to the hot water network, whether the circulation pump is running or not, the pressure at the outlet of the return pipe in the user system must be higher than the water level in that system, in order to prevent the system from emptying out and drawing in air, which could disrupt normal operation and cause pipe corrosion. The pressure at any point within the network return pipe should be at least 5 mH2O higher than atmospheric pressure to prevent air from being drawn in. At the heat station of the hot water network or at the user connection point, the operating pressure of the supply and return pipes must meet the head pressure required by the heat station or the user.