What is the function of the air conditioner on board?

Marine air conditioning is used to meet the needs of hygiene and comfort, it should generally meet some conditions, the temperature of the air should be 19 22 in winter, 24 28 in summer, the temperature difference between indoor and outdoor does not exceed 3 5, and the temperature difference between indoor and outdoor in summer does not exceed 6 10The humidity of the air should be 30% to 40% in winter and 30% in summer

40%~50%.The freshness of the air includes the two requirements of air freshness and freshness, to meet the needs of oxygen for human breathing, the flow rate of the air, the air flow speed is appropriate, the noise shall not be greater than 55-60db (a).

Because the meteorological and climatic conditions at sea are complex, the environment that marine air conditioners need to deal with is much more complex. In order to create a good working and living environment for the crew or passengers, the air temperature, humidity, freshness, flow rate and noise created by the air conditioner are required on relatively small ships. Ship air conditioning generally adopts centralized air conditioning device, the air is centrally processed and then distributed to each cabin, only some special cabins such as the engine room centralized control room are equipped with a special air conditioner, Ruijin special warm reminder, seawater is corrosive, so you also need to consider the anti-corrosion of air conditioning.

Ship air conditioners must not only adapt to harsh environments such as salt spray, mold, and humidity at sea, but also must adapt to irregular movements such as ship swinging and tilting. It is an important piece of equipment used to ensure the proper functioning of personnel and equipment. its operation.

Marine air conditioning is used to meet the needs of hygiene and comfort, it should generally meet some conditions, the temperature of the air should be 19 22 in winter, 24 28 in summer, and the temperature difference between indoor and outdoor should not exceed 3 5....

The role of air conditioning is generally to refrigerate and keep warm. There's nothing to say about this.

Of course, it's refrigeration, it's the same as at home.

The air conditioners used on ships generally serve as dehumidification.

Air conditioning is all about cooling or heating up, what else do you think it does?

The differences between marine air conditioners and air conditioners applied on land are as follows:

1. The marine environment has the characteristics of high salinity and high humidity, which requires the improvement of anti-corrosion, anti-humidity and anti-mildew performance of the air-conditioning system.

2. When the ship sails on the water surface, it will tilt or sway due to wind and waves, and the national standard requires that the surface ship roll 5 ° and 15 ° and 15 ° and 45 ° and 10 °, and the submarine requires 10 ° and 15 ° and 45 °, and the air conditioning equipment must be able to ensure the normal operation within this range.

3. When the marine air conditioner is in the marine environment and directly uses seawater or sea air for cooling, the condenser must consider the corrosion of seawater and salt spray.

4. The ship is separated from the outside world by water, and may operate for a long time on the ocean, and its maintenance has certain limitations, so repairability is very important.

5. The operating environment of marine air conditioning changes with geographical location, so the air conditioner should have the function of adaptive and adjustable load, which can save energy on board to the greatest extent and improve the comfort in the cabin.

In short, in addition to the basic refrigeration capacity, marine air conditioners also need to have anti-corrosion, anti-vibration, anti-tilting and swaying capabilities.

The working principle of the marine refrigeration system is the same as that of the ordinary refrigeration system, but the selection and design of the main components of the system and the selection of accessories need to consider the uniqueness of the working environment and operating conditions of the marine air conditioner.

The best performance of marine air conditioners is anti-rust, moisture-proof, anti-salt spray, anti-bump and rocking.

In order to make the crew and passengers have a comfortable living and working environment, air conditioning technology can be used to create a suitable artificial climate in the cabin and improve the environment. Therefore, the research and development of marine air conditioning for modern ships is a hot scientific research topic.

Requirements for air conditioning on ships.

Ship air conditioning is only used to meet the needs of hygiene and comfort, to create a good working and resting environment for the crew, called comfort air conditioning, it is not very strict on air conditions, and should generally meet the following aspects.

Air temperature: 19-22 C in winter, 24-28 C in summer, indoor and outdoor temperature difference does not exceed 6-10t; The indoor vertical temperature difference does not exceed 3-5, and the indoor and outdoor temperature difference does not exceed 6-10 in summer'e。

Air Humidity: Relative Humidity in Winter? : 30%-40%, relative humidity in summer? w40% 50%。

Air freshness: including air freshness (less dust and harmful gases) and freshness (sufficient oxygen content) two requirements, to meet the needs of human breathing for oxygen, fresh air supply per person 2 4m3 h, to make carbon dioxide, flue gas and other harmful gases below the allowable value, fresh air volume requirements per person 30 50m3 h.

Air flow rate: In the cabin, there is a slight flow of air, which makes people feel not stuffy, and the air flow speed is required to be o 15 o 2m h, and the maximum is not more than 0 35m h, otherwise people will feel uncomfortable.

Noise: From the air outlet of the indoor air conditioner, the noise of the test should not be greater than 55-60db(a).

Thermal and wet loads of the cabin.

The amount of heat that infiltrates into the chamber per unit time and causes a change in room temperature is called the sensible heat load of the chamber, which mainly includes:

Infiltration heat: In summer, the heat transferred through the ship envelope accounts for about 26%-31% of the sensible heat load in the cabin.

Solar radiant heat: about 25%-27% infiltrates through external windows.

Human body heat dissipation: the average per person is about 210kJ h, and the human body heat dissipation accounts for about 16%-18%.

Heat dissipation of lighting and other electrical equipment: about 4%-5%.

Heat dissipation for food, combustion, or other processes:

Q for sensible heat load. (kj h) indicates that in summer, the heat generated by solar radiation and the infiltration heat generated by the temperature difference between indoor and outdoor environments are transferred from the outside to the inside, and the sensible heat load is positive. In winter, the temperature difference between indoor and outdoor makes the heat dissipate from the inside to the outside, although the radiation of the sun, the heat emitted by the human body and equipment and its transmission direction remain unchanged, but compared with the previous item, its value is very small, in general, the winter cabin is from the inside to the outside of the heat, and its sensible heat load is negative.

The moisture of the air-conditioned cabin comes from the water vapor, food and water emitted by the human body, and the moisture amount of people brought by the air intrusion, and the amount of water vapor dispersed per hour is called the humidity load in the cabin, which is f. (g h). The human body and food are always emitting water vapor to increase the moisture content in the cabin, so the humidity load in the cabin is always positive in winter and summer.

In order to achieve the heat and humidity balance of the empty cabin, it is required that when the air-conditioning cabin reaches stability, the heat brought by the air conditioning air supply and ventilation is balanced with the sensible heat load and humidity load in the cabin.