In a central air-conditioning system, regional flow balancing valves for controlling flow of water return branch pipes are arranged on the water return branch pipes, and energy balancing valves are arranged on water return pipes of tail-end fan coils respectively. A control method includes: detecting flow in the water return branch pipes, and adjusting the flow in the return branch pipes to be smaller than or equal to a branch pipe set flow value; and detecting the temperature of return water in the water return pipes of the tail-end fan coils, controlling the temperature of the return water in the water return pipes of the tail-end fan coils to be greater than or equal to a tail-end return water set temperature value, detecting the room temperature and adjusting the opening degree of the energy balancing valves in temperature controllers.

A heat emitting radiator for use in a fluid circuit containing coolant therein, and which can generate substantial amounts of heat to heat larger spaces, such as in a home or business, while utilizing minimal power to run, and which can be utilized in various implementations and configurations. The radiator can be selectively activated or de-activated by, for example, a cell phone or the like whereby the fluid circuit in the radiator can be monitored for time of use, temperature and cost of use.

Embodiments are disclosed of a radiator temperature control apparatus for controlling the heat output of a radiator. The radiator temperature control apparatus may include an airtight enclosure around the air outlet of the radiator air vent, an adjustable opening in the airtight enclosure controlled by an actuator, and a controller connected to the actuator. In operation, the controller can be configured to open the adjustable opening in the airtight enclosure allowing air in the radiator to be expelled through the adjustable opening, thereby allowing steam to enter the radiator, and heat the room. The controller can be configured to close the adjustable opening, stopping air from being expelled from the radiator, thereby stopping additional steam from entering the radiator.

A heat emitting radiator for use in a fluid circuit containing coolant therein, and which can generate substantial amounts of heat to heat larger spaces, such as in a home or business, while utilizing minimal power to run, and which can be utilized in various implementations and configurations. The radiator can be selectively activated or de-activated by, for example, a cell phone or the like whereby the fluid circuit in the radiator can be monitored for time of use, temperature and cost of use.

Embodiments are disclosed of a radiator temperature control apparatus for controlling the heat output of a radiator. The radiator temperature control apparatus may include an airtight enclosure around the air outlet of the radiator air vent, an adjustable opening in the airtight enclosure controlled by an actuator, and a controller connected to the actuator. In operation, the controller can be configured to open the adjustable opening in the airtight enclosure allowing air in the radiator to be expelled through the adjustable opening, thereby allowing steam to enter the radiator, and heat the room. The controller can be configured to close the adjustable opening, stopping air from being expelled from the radiator, thereby stopping additional steam from entering the radiator.