Disclosed is a control method of a damper of a variable-air-volume air distributor and a control system thereof, mainly comprising a volume adjusting valve for the variable-air-volume air distributor, a valve actuator, a BP neural network-based main controller, a data collector and a user operation panel. The control method thereof is to use, mainly based on the collected room temperature and static pressure at the inlet of the air distributor, the BP neural network predictive model to establish a nonlinear model of temperature & static pressure and valve opening, perform training and optimization, and optimize the output valve opening to obtain and label an optimal value as the set value of the controller to control the action of the valve actuator, thereby realizing an automatic variable air volume.

A refrigerant air conditioner for boats in ports and marinas, comprising a compressor (1), an external heat exchanger, an internal heat exchanger (13) cooperating with a fan (12). The compressor (1) and the external heat exchanger are contained within an air conditioner container (16; 38) forming part of a multi-service pedestal (17; 36), equipped with a support structure (20; 37) situated on a pier (P) or quay, and the room heat exchanger (13) is placed in a boat (B) moored to pier (P) or quay.

An apparatus for air-conditioning of watercraft and the like including: an electronically controlled variable-r.p.m. compressor, a main gas/water condenser (5), at least one environmental heat-exchanger (3) with an electronically controlled fan (14), at least one electronically controlled expansion valve (8), and at least one first electronic control unit (4) programmed for calculating continuously a temperature deviation detected (DeltaT=T_adT_a), and as a function of the temperature deviation regulating in combination, the r.p.m. of the compressor (1), opening of the flow valve (8), and the r.p.m. of the fan of the heat-exchanger (3).

An apparatus for air-conditioning of watercraft and the like including: an electronically controlled variable-r.p.m. compressor, a main gas/water condenser (5), at least one environmental heat-exchanger (3) with an electronically controlled fan (14), at least one electronically controlled expansion valve (8), and at least one first electronic control unit (4) programmed for calculating continuously a temperature deviation detected (DeltaT=T_adT_a), and as a function of the temperature deviation regulating in combination, the r.p.m. of the compressor (1), opening of the flow valve (8), and the r.p.m. of the fan of the heat-exchanger (3).

A ventilation system is provided for persistent natural ventilation by circulation of air between an interior space and an external environment. In one example, the ventilation system includes an air intake including a domed upper cover with exterior windows which allow air to circulate through an upper chamber, a baffle around floatable elements, the baffle including an annular protective screen and valve windows, a lower chamber fluidly coupled to each of the upper chamber via the baffle and an interior duct via a main window thereof, wherein the interior duct is fluidly coupled to the interior space, and wherein the floatable elements are positioned on respective seats when no liquid is present, each of the seats spaced a distance opposite to a respective one of the valve windows. Responsive to liquid entering the upper chamber via the exterior windows, the valve windows may be automatically blocked by the floatable elements.

Disclosed is a composite thermal management system for an electric ship capable of maximizing the performance of a battery through efficient thermal management of a cabin, a battery, and a motor, and selectively switching between cooling and heating by a heat pump control method. The composite thermal management system for an electric ship selectively cools or heats a cabin, a battery, and a motor equipped in the electric ship, and includes a first heating and cooling unit that selectively switches a circulation cycle of a refrigerant according to a cooling or heating mode to cool or heat an inside of the cabin and a second heating and cooling unit that cools and heats the battery and the motor using coolant heat-exchanged with the refrigerant.

Disclosed is a composite thermal management system for an electric ship capable of maximizing the performance of a battery through efficient thermal management of a cabin, a battery, and a motor, and selectively switching between cooling and heating by a heat pump control method. The composite thermal management system for an electric ship selectively cools or heats a cabin, a battery, and a motor equipped in the electric ship, and includes a first heating and cooling unit that selectively switches a circulation cycle of a refrigerant according to a cooling or heating mode to cool or heat an inside of the cabin and a second heating and cooling unit that cools and heats the battery and the motor using coolant heat-exchanged with the refrigerant.