Ship heating systems can be steam, water, air and electric, and modern marine vessels are widely used in air conditioning systems. There are a hundred ships on the sea. as well as on small ships of coastal inland navigation, where the use of air conditioning systems is not always economically justified, it uses arched and water heating. Since January 1970 r. the use of steam heating according to the rules approved by the CMEA member countries is not allowed in residential, public, medical premises and premises where people carry a constant watch (with the exception of machinery and boiler rooms and similar premises). The highest santharno – hygienic conditions They are achieved with the use of air heating, which follows races. see as a special case of the air conditioning system and which is intended for operation only in winter conditions. The use of steam and electric heating reduces the relative humidity of the air in the rooms and does not ensure the stability of the thermal regime. Electric heating, carried out by electric heating appliances) is not considered.in the present textbook, as it is studied in the relevant course. The planned increase in the number of ships is becoming increasingly widespread 41a ships of the marine fleet, as it ensures simultaneous clearance and ventilation of premises, air heating systems are used in residential, service and public premises (but not in smoking, battery rooms, carbon dioxide extinguishing stations and rooms). The operation of the system is based on the heating of air in the air ° preheaters and races. the allocation of ero for the serviced premises. In the cold season, the system is used for heating and ventilation, and in the warmest time – only for pent | tion. The combination of ventilation and heating in one system allows for a wide variation of the room temperature. The air heating system is simpler than the steam and water heating system. Structurally it is carried out according to the autonomous or group principle – depending on the number, purpose and location of the serviced premises. For example, the heating of public premises, medical isolators and rooms with large volumes is performed by an autonomous principle. Air heated in the group air heaters, secondary. but is heated in air-regulated heaters housed in crockery cabinets (Figure 182). When air comes out of the air distribution cabinet 1 due to ejector
Scheme of air heating system.
1) – air distribution cabinets; 2)-sound-absorbing layer of nylon fiber; 3)-each of the mushroom head; 4)-fan; 5)-circulation air piping; 6)-group air heater; 7)-heating steam supply and discharge; 8)-heated air duct; 9)-regulating valve; 10)-local adjustable air heater; 11)-secondary air heater; 12)-steam supply and discharge.
air recirculation inside the room. The ejection factor for different air distributors can be set at 2.5-3. Air circulation within the limits allowed by sanitary rules. it is used in pomeshenney. in which there are no harmful steam and gas deposits. The operation of the vuel heating system without recirculation is uneconomical. The system indicators depend on the speed of the air in the main pipelines, which is 10-15 m / s for low-speed systems and 20-25 m / s for high-speed systems. The required pressure of low-speed (low-pressure) The system reaches 100-180, and high-speed (high-density) -300-500 m. “Low-pressure systems have pipelines with larger cross-sectional sections, which are more difficult to locate on the ship.” The low velocity of motion in these systems actually removes the action of the action, so all pipelines are fed through pipelines through the pipelines an even amount of air A change in the air flow in one room can lead to a change in the drain in the rest of the room. * In order to do this, regulators * are installed in the systems, maintaining static lavlennes within the limits set by 0ir Low-speed systems are used in rooms where there is no need for individual adjustment of the air parameters, for example in public areas, cabins. High-level systems have a more stable mode of operation and are used for heating cabins and rooms where individual adjustment is required When the outside air is heated, the relative humidity decreases and, as a rule, is insufficient to ensure normal conditions. The inclusion of humidification systems in the air heating system allows us to call it the winter conditioning system.