Cooling and heating combined supply system and method for marine engine room

Abstract

The invention discloses a combined cooling and heating system for a marine engine room. The combined cooling and heating system comprises an air treatment unit, a reverse Carnot cycle loop system, a daily hot water preparation unit and a seawater cooling unit, the air processing unit comprises a box body provided with a cabin air inlet, a fresh air opening and an air outlet; an evaporator and a centrifugal fan are sequentially arranged in the box body from the air inlet side to the air outlet side. An expansion valve of the reverse Carnot cycle loop system, a heat source channel of an evaporator, a gas-liquid separator, a compressor and a heat source channel of a seawater condenser are sequentially communicated through pipelines to form a loop. The expansion valve, a heat source channel of the evaporator, the gas-liquid separator, the compressor and a heat source channel of the fresh water condenser are sequentially communicated through pipelines to form a loop. The invention further discloses a cold and heat combined supply method for the marine engine room. The system has the beneficial effects that on the basis of the reverse Carnot cycle technical principle, engine room hot air serves as a heat source, daily fresh water serves as a cold source, and hot water is supplied to a ship while the ship engine room is cooled.

Description

Technical Field

[0001] The present invention relates to the technical field of ship resource support, and in particular to a ship engine room cooling and heating combined supply system and method. Background Art

[0002] Ship engine rooms typically house main engines, auxiliary engines, and numerous electromechanical equipment, generating significant heat. The design temperature for these rooms is typically between 40°C and 60°C. Therefore, specialized cooling or ventilation facilities are required to dissipate heat generated internally and heat penetrating through the bulkheads.

[0003] Currently, engine room cooling systems typically use air coolers, with seawater pumps supplying the cooling medium. This water exchanges heat with the hot air in the engine room, and the heated seawater is then discharged overboard. Limited by the seawater temperature (32°C) and the heat exchange temperature gradient, the cooling effect of air coolers is limited, with the outlet air temperature typically at 35°C. This creates a poor engine room operating environment and results in significant air energy loss, resulting in high system energy consumption. Furthermore, the temperature of hot water for washing is generally required to be between 40°C and 70°C. To meet this daily hot water demand, hot water tanks are typically required, using either electric or steam heating. Electricity and high-temperature steam are high-quality energy sources, and using these to produce low-temperature hot water is energy-wasting.

[0004] Faced with the dual needs of cooling the internal environment of the ship's engine room and ensuring daily hot water supply, if cooling equipment and hot water cabinets are configured separately, a large amount of electricity energy will be consumed, the system operation energy consumption will be high, and a large amount of air heat energy will be lost. At the same time, the air outlet temperature of the air cooler that only uses seawater as the cooling medium is high, the cooling effect is poor, and the engine room working environment is poor. Summary of the Invention

[0005] The purpose of the present invention is to provide a ship engine room combined heating and cooling system and method to address the deficiencies of the existing technology, aiming to cool the ship engine room and supply daily hot water for the ship.

[0006] The technical solution adopted by the present invention is: a ship engine room combined heating and cooling system, including an air handling unit, a reverse Carnot cycle loop system, a daily hot water preparation unit and a seawater cooling unit; The air handling unit includes a box body provided with a cabin air inlet, a fresh air outlet, and an air outlet; an air inlet section is provided in the box body, and the air inlet section is connected to the cabin air inlet and the fresh air outlet; an evaporator and a centrifugal fan are sequentially provided in the box body along the air inlet side to the air outlet side, and the outlet of the centrifugal fan is connected to the air outlet; The reverse Carnot cycle loop system includes an expansion valve, a gas-liquid separator, a compressor, a seawater condenser, and a freshwater condenser; the expansion valve, the heat source channel of the evaporator, the gas-liquid separator, the compressor, and the heat source channel of the seawater condenser are sequentially connected through pipelines to form a loop; the expansion valve, the heat source channel of the evaporator, the gas-liquid separator, the compressor, and the heat source channel of the freshwater condenser are sequentially connected through pipelines to form a loop; refrigerant flows in both loops; The cold source channel of the seawater condenser is connected to the seawater cooling unit; The cold source channel of the fresh water condenser is connected to the daily hot water preparation unit.

[0007] According to the above solution, the reverse Carnot cycle loop system further includes a liquid accumulator and a refrigerant three-way valve; The liquid accumulator, expansion valve, heat source channel of the evaporator, gas-liquid separator and compressor are connected in sequence through pipelines; the outlet of the compressor is connected to the inlet of the refrigerant three-way valve through a pipeline, the first outlet of the refrigerant three-way valve is connected to the inlet of the heat source channel of the seawater condenser, and the outlet of the heat source channel of the seawater condenser is connected to the liquid accumulator; the second outlet of the refrigerant three-way valve is connected to the inlet of the heat source channel of the fresh water condenser, and the outlet of the heat source channel of the fresh water condenser is connected to the liquid accumulator.

[0008] According to the above solution, a water retainer is further provided in the box of the air handling unit, and the water retainer is located between the evaporator and the centrifugal fan; the outlet of the centrifugal fan is connected to the air outlet static pressure box, and the air outlet static pressure box is connected to the air outlet.

[0009] According to the above scheme, the box body of the air handling unit is divided into an air inlet section, an air cooling section, an air mixing section and an air outlet section from the air inlet side to the air outlet side; a fresh air valve is provided at the fresh air inlet; the evaporator and the water retainer are both arranged in the air cooling section; the mixed air section is provided with a mixed air port, and the mixed air port is equipped with a mixed air valve; the air outlet static pressure box is arranged in the air outlet section, and the air outlet is installed with a temperature and humidity sensor.

[0010] According to the above scheme, the seawater cooling unit includes a seawater inlet pipeline and a seawater outlet pipeline; the seawater inlet pipeline is sequentially provided with a sea valve, a seawater filter, a seawater pump and a stop check valve along the direction of coastal water flow, and the outlet of the seawater inlet pipeline is connected to the inlet of the cold source channel of the seawater condenser; the inlet of the seawater outlet pipeline is connected to the outlet of the cold source channel of the seawater condenser, and the outlet of the seawater outlet pipeline is connected to the side valve.

[0011] According to the above solution, the seawater cooling unit also includes a fire water pressure reducing water supply pipeline, on which a seawater pressure reducing valve is provided; the outlet of the seawater pressure reducing valve is connected to the cold source channel of the seawater condenser.

[0012] According to the above scheme, the daily hot water preparation unit includes a fresh water cold water supply pipeline, a fresh water inlet pipeline, a fresh water outlet pipeline and a fresh water hot water supply pipeline; the ship's fresh water tank, fresh water cold water supply pipeline and fresh water inlet pipeline are connected in sequence; the outlet of the fresh water inlet pipeline is connected to the inlet of the cold source channel of the fresh water condenser; the inlet of the fresh water outlet pipeline is connected to the outlet of the cold source channel of the fresh water condenser, and the fresh water outlet pipeline and the fresh water hot water supply pipeline are connected in sequence with the ship's hot water tank; the fresh water inlet pipeline, fresh water outlet pipeline and fresh water hot water supply pipeline are respectively provided with thermometers; the fresh water inlet pipeline is provided with a fresh water delivery pump, and the fresh water hot water supply pipeline is provided with a hot water delivery pump.

[0013] According to the above scheme, the daily hot water preparation unit is also provided with a fresh water three-way valve and a temperature-controlled water tank; the first inlet of the fresh water three-way valve is connected to the fresh water cold water supply pipeline, the second inlet of the fresh water three-way valve is connected to the temperature-controlled water tank, and the outlet of the fresh water three-way valve is connected to the fresh water inlet pipeline; the fresh water outlet pipeline, the temperature-controlled water tank and the fresh water hot water supply pipeline are connected in sequence.

[0014] The present invention also adopts a ship engine room combined cooling and heating method based on the ship engine room combined cooling and heating system as described above, the method comprising: The refrigerant in the reverse Carnot cycle system exchanges heat with the ship's engine room air entering the air handling unit in the evaporator. The air temperature is reduced after the heat exchange and then enters the ship's engine room. When the ship needs to supply hot water, the refrigerant three-way valve in the reverse Carnot cycle loop system is switched, so that the compressor in the reverse Carnot cycle loop system is connected to the heat source channel of the fresh water condenser through the refrigerant three-way valve. The refrigerant absorbs heat from the air in the air handling unit in the evaporator, and then enters the fresh water condenser after being compressed by the compressor. The daily fresh water from the fresh water treatment unit is heated in the fresh water condenser and supplied to the ship's hot water users. After the heat exchange, the refrigerant temperature is reduced and enters the evaporator again through the pipeline. When the ship does not need to produce hot water, the refrigerant three-way valve in the reverse Carnot cycle loop system is switched so that the compressor in the reverse Carnot cycle loop system is connected to the heat source channel of the seawater condenser through the refrigerant three-way valve. The refrigerant absorbs heat from the air in the air handling unit in the evaporator, and then enters the seawater condenser after being compressed by the compressor. In the seawater condenser, heat exchange is carried out with the side seawater in the seawater treatment unit. After the heat exchange, the temperature of the refrigerant is reduced and it enters the evaporator again through the pipeline.

[0015] According to the above scheme, when the ship needs to be supplied with fresh water, if the temperature of the water entering the temperature-controlled water tank is lower than the set value, the flow of water entering the fresh water inlet pipe through the fresh water cold water supply pipe will be reduced, and the flow of water entering the fresh water inlet pipe through the temperature-controlled water tank will be increased.

[0016] The beneficial effects of this invention are as follows: Based on the principles of reverse Carnot cycle technology, this system uses hot engine room air as a heat source and daily fresh water as a cold source, cooling the ship's engine room while also supplying hot water. Furthermore, the system incorporates a seawater cooling unit based on external climate changes and the changing demand for daily hot water on board. When hot water production is not required or the cold wash water supply is insufficient, the system switches to the seawater cooling unit, where the seawater condenser cools the refrigerant, improving system reliability. Compared to traditional engine room cooling systems and electric water heaters, this system significantly improves energy conservation, achieves better engine room cooling (lower air supply temperature), and enhances the engine room working environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural diagram of a specific embodiment of the present invention.

[0018] 1. Fresh air valve; 2. Container; 3. Air mixing valve; 4. Evaporator; 5. Water retainer; 6. Centrifugal fan; 7. Expansion valve; 8. Liquid receiver; 9. Compressor; 10. Gas-liquid separator; 11. Refrigerant three-way valve; 12. Fresh water condenser; 13. Seawater condenser; 14. Stop check valve; 15. Seawater pressure reducing valve; 16. Seawater pump; 17. Seawater filter; 18. Sea valve; 19. Fresh water transfer pump; 20. Thermometer; 21. Fresh water three-way valve ; 22. Temperature-controlled water tank; 23. Hot water delivery pump; 24. Air outlet static pressure box; 25. Temperature and humidity sensor; 26. Fresh water tank; 27. Hot water cabinet; 28. Fresh water cold water supply pipeline; 29. Fresh water hot water supply pipeline; 30. Fresh water inlet pipeline; 31. Fresh water outlet pipeline; 32. Cabin air inlet; 33. Fire water pressure reducing supply pipeline; 34. Seawater inlet pipeline; 35. Seawater outlet pipeline; 36. Fresh air inlet; 37. Mixing air outlet; 38. Air outlet. DETAILED DESCRIPTION

[0019] To make the objectives, technical solutions, and advantages of this application more clear, the technical solutions of this application will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the embodiments described are only part of the embodiments of this application, not all of them. Based on the embodiments of this application, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of this application.

[0020] In the description of the embodiments of the present application, it should be noted that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as limiting the embodiments of the present application. In addition, the terms "first", "second", and "third" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0021] In the description of the embodiments of this application, it should be noted that, unless otherwise specified or limited, the terms "connected" and "connection" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium. Those skilled in the art will understand the specific meanings of the above terms in the embodiments of this application based on the specific circumstances.

[0022] In the embodiments of the present application, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Furthermore, a first feature being "above," "above," and "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0023] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the embodiments of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. In addition, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples, unless they are contradictory. In addition, the term "plurality" means including two or more.

[0024] like Figure 1A combined heating and cooling system for a ship engine room is shown, comprising an air handling unit, a reverse Carnot cycle system, a daily hot water preparation unit, and a seawater cooling unit; The air handling unit includes a housing 2 having a cabin air inlet 32, a fresh air outlet 36, and an air outlet 38; an air inlet section is provided in the housing 2, and the air inlet section is connected to the cabin air inlet 32 and the fresh air outlet 36; an evaporator 4 and a centrifugal fan 6 are sequentially provided in the housing 2 from the air inlet side to the air outlet side, and the outlet of the centrifugal fan 6 is connected to the air outlet 38; The reverse Carnot cycle loop system includes an expansion valve 7, a gas-liquid separator 10, a compressor 9, a seawater condenser 13, and a freshwater condenser 12; the expansion valve 7, the heat source channel of the evaporator 4, the gas-liquid separator 10, the compressor 9, and the heat source channel of the seawater condenser 13 are sequentially connected through pipelines to form a loop; the expansion valve 7, the heat source channel of the evaporator 4, the gas-liquid separator 10, the compressor 9, and the heat source channel of the freshwater condenser 12 are sequentially connected through pipelines to form a loop; refrigerant flows in both loops; The cold source channel of the seawater condenser 13 is connected to the seawater cooling unit; The cold source channel of the fresh water condenser 12 is connected to the daily hot water preparation unit.

[0025] In the present invention, the refrigerant is a Freon refrigerant, specifically R410A or R22; the refrigerant absorbs heat from the air entering the air handling unit from the ship's engine room and the fresh air outside the cabin in the evaporator 4, releases heat to the seawater in the seawater cooling unit in the seawater condenser 13, and heats the daily fresh water from the daily hot water preparation unit in the fresh water condenser 12 to deliver hot water to ship users.

[0026] Preferably, the reverse Carnot cycle loop system further includes a liquid accumulator 8 and a refrigerant three-way valve 11; The liquid accumulator 8, the expansion valve 7, the heat source channel of the evaporator 4, the gas-liquid separator 10 and the compressor 9 are connected in sequence through pipelines; the outlet of the compressor 9 is connected to the inlet of the refrigerant three-way valve 11 through a pipeline, the first outlet of the refrigerant three-way valve 11 is connected to the inlet of the heat source channel of the seawater condenser 13 through a pipeline, and the outlet of the heat source channel of the seawater condenser 13 is connected to the liquid accumulator 8 through a pipeline; the second outlet of the refrigerant three-way valve 11 is connected to the inlet of the heat source channel of the fresh water condenser 12 through a pipeline, and the outlet of the heat source channel of the fresh water condenser 12 is connected to the liquid accumulator 8 through a pipeline.

[0027] In the present invention, the liquid accumulator 8 is used to receive and store liquid refrigerant from the condenser (including the fresh water condenser 12 and the seawater condenser 13), regulate the amount of refrigerant supplied to the expansion valve 7, and ensure stable operation of the system; the gas-liquid separator 10 is used to separate and store the refrigerant liquid, thereby ensuring the safe operation of the compressor 9.

[0028] In the present invention, the evaporator 4, expansion valve 7, liquid accumulator 8, compressor 9, gas-liquid separator 10, refrigerant three-way valve 11, fresh water condenser 12, seawater condenser 13, and associated piping constitute a reverse Carnot cycle. The refrigerant absorbs heat from the cabin air in the evaporator 4, releases heat to the seawater in the seawater condenser 13, and heats the daily fresh water in the fresh water condenser 12. The refrigerant three-way valve 11 switches the refrigerant flow in the reverse Carnot cycle. When daily hot water production is required, the refrigerant three-way valve 11 is closed, the inlet of the refrigerant three-way valve 11 is connected to the first outlet (in a bypass state), and the refrigerant enters only the fresh water condenser 12. When daily hot water production is not required or the fresh water cooling capacity is insufficient, the refrigerant three-way valve 11 is opened, the inlet of the refrigerant three-way valve 11 is connected to the second outlet, and the seawater pump 16 is activated, allowing some or all of the refrigerant to enter the seawater condenser 13 for heat exchange.

[0029] Preferably, a water retainer 5 is further provided in the box body 2 of the air handling unit, and the water retainer 5 is located between the evaporator 4 and the centrifugal fan 6; the outlet of the centrifugal fan 6 is connected to the air outlet static pressure box 24, and the air outlet static pressure box 24 is connected to the air outlet 38.

[0030] In the present invention, the box body 2 of the air handling unit is divided into an air intake section, an air cooling section, an air mixing section and an air outlet section from the air intake side to the air outlet side; a fresh air valve 1 is provided at the fresh air inlet 36, and the fresh air inlet 36 and the cabin air inlet 32 are both connected to the air intake section, and the air in the ship's cabin is mixed with the fresh air outside the cabin in the air intake section; the evaporator 4 and the water retainer 5 are both arranged in the air cooling section; the mixed air section is provided with a mixed air inlet 37, and the mixed air inlet 37 is equipped with a mixed air valve 3; the outlet static pressure box 24 is provided in the outlet section, and the outlet 38 is installed with a temperature and humidity sensor 25 for detecting the outlet air temperature and humidity.

[0031] In the present invention, taking into account the two operating conditions of cabin ventilation, namely ventilation and closed cycle, the air inlet section of the box body 2 is provided with a fresh air port 36 and a cabin air inlet 32. Under the ventilation operating condition, the fresh air outside the cabin is mixed with the cabin air entering the air inlet section, and then the temperature is reduced after passing through the evaporator 4 and exchanging heat with the refrigerant (if the outlet air temperature of the air outlet 38 is too low, it will cause condensation on the surface of the equipment inside the cabin. In order to avoid the outlet air temperature being too low, the return air in the cabin is sucked into the cabin from the air mixing port 37 for mixing). After being blocked by the water retainer 5, it enters the centrifugal fan 6, and then is statically pressurized by the outlet static pressure box 24 and sent into the cabin through the air outlet 38. Under the closed cycle operating condition, fresh air outside the cabin is not introduced, and the hot air in the cabin directly passes through the evaporator 4 for heat exchange, and then is mixed with the return air in the cabin and enters the centrifugal fan 6, and then is statically pressurized by the outlet static pressure box 24 and sent into the cabin through the air outlet 38.

[0032] In the present invention, the evaporator 4 is arranged in the air cooling section to exchange heat with the hot air composed of fresh air and cabin air. The condensed water in the air is separated by the water retainer 5 to prevent water from entering the centrifugal fan 6; the air after the water retaining treatment is mixed with the air from the air mixing port 37 (which is the return air in the cabin), and is transported to the air outlet static pressure box 24 through the centrifugal fan 6, and then returned to the interior of the cabin. Since the cabin is a high-temperature and high-humidity environment, the temperature of the air coming out of the air cooling section is very low. If it is directly sent into the cabin, it is easy to cause condensation when it encounters equipment or bulkhead surfaces. In order to avoid condensation and control the outlet air temperature, a mixing port 37 is set in the air mixing section, and the opening of the mixing valve 3 is adjusted according to the outlet air temperature to adjust the mixed air volume; the air after secondary mixing is transported by the centrifugal fan 6 to the outlet air static pressure box 24, and the outlet air static pressure box 24 can be connected to an air duct or provided with a spherical nozzle to deliver the treated air to the required area of the cabin; a temperature and humidity sensor 25 is set on the outlet side of the outlet air static pressure box 24 to monitor the air temperature and humidity parameters on the outlet side.

[0033] Preferably, the seawater cooling unit includes a seawater inlet pipeline 34 and a seawater outlet pipeline 35; the seawater inlet pipeline 34 is sequentially provided with a sea valve 18, a seawater filter 17, a seawater pump 16 and a stop check valve 14 along the direction of coastal water flow, and the outlet of the seawater inlet pipeline 34 is connected to the inlet of the cold source channel of the seawater condenser 13; the inlet of the seawater outlet pipeline 35 is connected to the outlet of the cold source channel of the seawater condenser 13, and the outlet of the seawater outlet pipeline 35 is connected to the side valve.

[0034] Preferably, the seawater cooling unit further comprises a fire water pressure reducing water supply pipeline 33 , on which a seawater pressure reducing valve 15 is provided; the outlet of the seawater pressure reducing valve 15 is connected to the cold source channel of the seawater condenser 13 .

[0035] In the present invention, a seawater pump 16 draws seawater from the sea valve 18 and sends it to the cold source channel of the seawater condenser 13 to exchange heat with the refrigerant in the heat source channel of the seawater condenser 13. A seawater filter 17 is provided at the inlet of the seawater pump 16 for filtering the seawater. At the same time, a fire water pressure reducing water supply pipeline 33 is provided as a backup pipeline for the seawater pump 16 to prevent the failure of the seawater pump 16 from affecting the operation of the system. To prevent seawater backflow, stop check valves 14 are respectively provided at the outlet of the seawater pump 16, the outlet of the seawater pressure reducing valve 15, and the inlet of the side valve.

[0036] Preferably, the daily hot water preparation unit includes a fresh water cold water supply pipeline 28, a fresh water inlet pipeline 30, a fresh water outlet pipeline 31 and a fresh water hot water supply pipeline 29; the ship's fresh water tank 26, the fresh water cold water supply pipeline 28 and the fresh water inlet pipeline 30 are connected in sequence through pipelines; the outlet of the fresh water inlet pipeline 30 is connected to the inlet of the cold source channel of the fresh water condenser 12 through a pipeline; the inlet of the fresh water outlet pipeline 31 is connected to the outlet of the cold source channel of the fresh water condenser 12, and the fresh water outlet pipeline 31, the fresh water hot water supply pipeline 29 and the ship's hot water tank 27 are connected in sequence through pipelines.

[0037] In the present invention, a thermometer 20 is provided on the fresh water inlet pipe 30 , the fresh water outlet pipe 31 and the fresh water hot water supply pipe 29 , respectively; a fresh water delivery pump 19 is provided on the fresh water inlet pipe 30 , and a hot water delivery pump 23 is provided on the fresh water hot water supply pipe 29 .

[0038] Preferably, the daily hot water preparation unit is further provided with a fresh water three-way valve 21 and a temperature-controlled water tank 22; the first inlet of the fresh water three-way valve 21 is connected to the fresh water cold water supply pipeline 28, the second inlet of the fresh water three-way valve 21 is connected to the temperature-controlled water tank 22, and the outlet of the fresh water three-way valve 21 is connected to the fresh water inlet pipeline 30; the fresh water outlet pipeline 31, the temperature-controlled water tank 22 and the fresh water hot water supply pipeline 29 are connected in sequence through pipelines.

[0039] In the present invention, the cold water (i.e., daily fresh water) from the fresh water tank 26 is mixed with the warm water from the temperature-controlled water tank 22 through the fresh water three-way valve 21, and then delivered by the fresh water delivery pump 19 to the fresh water condenser 12 for heat exchange with the refrigerant. The heated fresh water then returns to the temperature-controlled water tank 22. A thermometer 20 is provided on the fresh water outlet pipe 31 at the inlet of the temperature-controlled water tank 22 and the fresh water hot water supply pipe 29 at the outlet of the temperature-controlled water tank 22. The bypass opening of the fresh water three-way valve 21 is adjusted according to the temperature difference between the two. When the inlet temperature of the temperature-controlled water tank 22 is higher than the set value, the fresh water three-way valve 21 is fully opened, and the fresh water inlet pipe 30 is connected to the fresh water cold water supply pipe 28 through the fresh water three-way valve 21 (at this time, the water in the temperature-controlled water tank 22 does not pass through the fresh water three-way valve). 21 enters the fresh water inlet pipeline 30), and the water source of the fresh water delivery pump 19 is entirely from the cold water in the fresh water tank 26; when the inlet temperature of the temperature-controlled water tank 22 is lower than the set value, as the difference between the inlet temperature of the temperature-controlled water tank 22 and the outlet temperature of the fresh water delivery pump 19 decreases, the bypass opening of the fresh water three-way valve 21 decreases, thereby reducing the amount of cooling water entering the fresh water inlet pipeline 30 through the fresh water cold water supply pipeline 28 and increasing the amount of water entering the fresh water inlet pipeline 30 through the temperature-controlled water tank 22; the hot water delivery pump 23 is used to deliver hot water that meets the temperature standard to the hot water tank 27 for use by hot water users throughout the ship. The outlet pipeline of the hot water delivery pump 23 (that is, the fresh water and hot water supply pipeline 29 downstream of the hot water delivery pump 23) is equipped with a thermometer 20 for monitoring the hot water supply temperature.

[0040] In the present invention, each three-way valve is an electric three-way valve.

[0041] A method for co-supplying heat and cooling in a ship engine room based on the above-mentioned co-supplying heat and cooling system for the ship engine room, the method comprising: The refrigerant in the reverse Carnot cycle system exchanges heat with the ship's cabin air (temperature of 45°C to 60°C) entering the air handling unit in the evaporator 4. The air temperature after heat exchange is reduced and enters the ship's cabin; When the ship needs hot water (hot water temperature is 55°C to 70°C), the refrigerant three-way valve 11 in the reverse Carnot cycle system is switched, so that the compressor 9 in the reverse Carnot cycle system is connected to the heat source channel of the fresh water condenser 12 through the refrigerant three-way valve 11. The refrigerant absorbs heat from the air in the air handling unit in the evaporator 4, and then enters the fresh water condenser 12 after being compressed by the compressor 9. In the fresh water condenser 12, the daily fresh water from the fresh water treatment unit is heated (the temperature of the cooled fresh water is 5°C to 15°C when no heat exchange is performed). After the daily fresh water is heated, it is transported to the hot water tank 27 and supplied to the ship's hot water users. After the heat exchange, the temperature of the refrigerant is reduced and it enters the evaporator 4 again through the pipeline to absorb heat from the air in the ship's engine room. When the ship does not need to produce hot water or the supply of washing fresh water is insufficient, the refrigerant three-way valve 11 in the reverse Carnot cycle loop system is switched, so that the compressor 9 in the reverse Carnot cycle loop system is connected to the heat source channel of the seawater condenser 13 through the refrigerant three-way valve 11. The refrigerant absorbs heat from the air in the ship's engine room in the evaporator 4, and then enters the seawater condenser 13 after being compressed by the compressor 9. In the seawater condenser 13, heat exchange is carried out with the side seawater in the seawater treatment unit (the seawater temperature does not exceed 32°C when no heat exchange is carried out). The temperature of the refrigerant after the heat exchange is reduced, and it enters the evaporator 4 through the pipeline again to absorb heat from the air in the air treatment unit.

[0042] In the present invention, when the ship needs to be supplied with fresh water, if the temperature of the water entering the temperature-controlled water tank 22 is lower than the set value, the flow rate of water entering the fresh water inlet pipe 30 through the fresh water cold water supply pipe 28 is reduced, and the flow rate entering the fresh water inlet pipe 30 through the temperature-controlled water tank 22 is increased.

[0043] For example, a certain type of ship is equipped with two 50kW circulating ventilation units as engine room cooling equipment, a seawater pump 16 is provided to supply cooling seawater, and the total installed power of the cooling system is 37.5kW. A 48kW electric water heater 27 is also installed to provide hot water for washing throughout the ship. If the combined cooling and heating system and method of the present invention is adopted, and reference is made to relevant national standards and the cooling capacity of the circulating ventilation units, even in compliance with Level 3 energy efficiency requirements, the system operating power in combined cooling and heating mode is 33.3kW, while providing 400kW of heating power, significantly improving system operating energy efficiency.

[0044] The contents not described in detail in this specification belong to the prior art known to those skilled in the art.

[0045] Finally, it should be noted that the above are only preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or make equivalent replacements for some of the technical features therein. However, any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A ship engine room combined cooling and heating system, characterized in that: It includes air handling unit, reverse Carnot cycle system, daily hot water preparation unit and seawater cooling unit; The air handling unit includes a box body provided with a cabin air inlet, a fresh air outlet, and an air outlet; an air inlet section is provided in the box body, and the air inlet section is connected to the cabin air inlet and the fresh air outlet; an evaporator and a centrifugal fan are sequentially provided in the box body along the air inlet side to the air outlet side, and the outlet of the centrifugal fan is connected to the air outlet; The reverse Carnot cycle loop system includes an expansion valve, a gas-liquid separator, a compressor, a seawater condenser, and a freshwater condenser; the expansion valve, the heat source channel of the evaporator, the gas-liquid separator, the compressor, and the heat source channel of the seawater condenser are sequentially connected through pipelines to form a loop; the expansion valve, the heat source channel of the evaporator, the gas-liquid separator, the compressor, and the heat source channel of the freshwater condenser are sequentially connected through pipelines to form a loop; refrigerant flows in both loops; The cold source channel of the seawater condenser is connected to the seawater cooling unit; The cold source channel of the fresh water condenser is connected to the daily hot water preparation unit.

2. The ship engine room combined cooling and heating system according to claim 1, characterized in that: The reverse Carnot cycle loop system further includes a liquid accumulator and a refrigerant three-way valve; The liquid accumulator, expansion valve, heat source channel of the evaporator, gas-liquid separator and compressor are connected in sequence through pipelines; the outlet of the compressor is connected to the inlet of the refrigerant three-way valve through a pipeline, the first outlet of the refrigerant three-way valve is connected to the inlet of the heat source channel of the seawater condenser, and the outlet of the heat source channel of the seawater condenser is connected to the liquid accumulator; the second outlet of the refrigerant three-way valve is connected to the inlet of the heat source channel of the fresh water condenser, and the outlet of the heat source channel of the fresh water condenser is connected to the liquid accumulator.

3. The ship engine room combined cooling and heating system according to claim 2, characterized in that: A water retainer is further provided in the box body of the air handling unit, and the water retainer is located between the evaporator and the centrifugal fan; the outlet of the centrifugal fan is connected to the air outlet static pressure box, and the air outlet static pressure box is communicated with the air outlet.

4. The ship engine room combined cooling and heating system according to claim 3, characterized in that: The air handling unit box is divided into an air inlet section, an air cooling section, an air mixing section and an air outlet section from the air inlet side to the air outlet side; a fresh air valve is provided at the fresh air inlet; the evaporator and the water retainer are both arranged in the air cooling section; the air mixing section is provided with an air mixing port, and the air mixing port is equipped with an air mixing valve; the air outlet static pressure box is arranged in the air outlet section, and the air outlet is installed with a temperature and humidity sensor.

5. The ship engine room combined cooling and heating system according to claim 4, characterized in that: The seawater cooling unit includes a seawater inlet pipeline and a seawater outlet pipeline; the seawater inlet pipeline is sequentially provided with a sea valve, a seawater filter, a seawater pump and a stop check valve along the direction of seawater flow; the outlet of the seawater inlet pipeline is connected to the inlet of the cold source channel of the seawater condenser; the inlet of the seawater outlet pipeline is connected to the outlet of the cold source channel of the seawater condenser, and the outlet of the seawater outlet pipeline is connected to the side valve.

6. The ship engine room combined cooling and heating system according to claim 5, characterized in that: The seawater cooling unit further comprises a fire water pressure reducing water supply pipeline, on which a seawater pressure reducing valve is arranged; the outlet of the seawater pressure reducing valve is communicated with a cold source channel of the seawater condenser.

7. The ship engine room combined cooling and heating system according to claim 1, characterized in that: The daily hot water preparation unit includes a fresh water cold water supply pipeline, a fresh water inlet pipeline, a fresh water outlet pipeline and a fresh water hot water supply pipeline; the ship's fresh water tank, fresh water cold water supply pipeline and fresh water inlet pipeline are connected in sequence; the outlet of the fresh water inlet pipeline is connected to the inlet of the cold source channel of the fresh water condenser; the inlet of the fresh water outlet pipeline is connected to the outlet of the cold source channel of the fresh water condenser, and the fresh water outlet pipeline and the fresh water hot water supply pipeline are connected in sequence with the ship's hot water tank; the fresh water inlet pipeline, fresh water outlet pipeline and fresh water hot water supply pipeline are respectively provided with a thermometer; the fresh water inlet pipeline is provided with a fresh water delivery pump, and the fresh water hot water supply pipeline is provided with a hot water delivery pump.

8. The ship engine room combined cooling and heating system according to claim 7, characterized in that: The daily hot water preparation unit is also provided with a fresh water three-way valve and a temperature-controlled water tank; the first inlet of the fresh water three-way valve is connected to the fresh water cold water supply pipeline, the second inlet of the fresh water three-way valve is connected to the temperature-controlled water tank, and the outlet of the fresh water three-way valve is connected to the fresh water inlet pipeline; the fresh water outlet pipeline, the temperature-controlled water tank and the fresh water hot water supply pipeline are connected in sequence.

9. A method for co-supplying heat and cooling in a ship engine room based on the ship engine room co-supply heat and cooling system according to claim 2, characterized in that: The method is: The refrigerant in the reverse Carnot cycle system exchanges heat with the ship's engine room air entering the air handling unit in the evaporator. The air temperature is reduced after the heat exchange and then enters the ship's engine room. When the ship needs to supply hot water, the refrigerant three-way valve in the reverse Carnot cycle loop system is switched, so that the compressor in the reverse Carnot cycle loop system is connected to the heat source channel of the fresh water condenser through the refrigerant three-way valve. The refrigerant absorbs heat from the air in the air handling unit in the evaporator, and then enters the fresh water condenser after being compressed by the compressor. The daily fresh water from the fresh water treatment unit is heated in the fresh water condenser and supplied to the ship's hot water users. After the heat exchange, the refrigerant temperature is reduced and enters the evaporator again through the pipeline. When the ship does not need to produce hot water, the refrigerant three-way valve in the reverse Carnot cycle loop system is switched so that the compressor in the reverse Carnot cycle loop system is connected to the heat source channel of the seawater condenser through the refrigerant three-way valve. The refrigerant absorbs heat from the air in the air handling unit in the evaporator, and then enters the seawater condenser after being compressed by the compressor. In the seawater condenser, heat exchange is carried out with the side seawater in the seawater treatment unit. After the heat exchange, the temperature of the refrigerant is reduced and it enters the evaporator again through the pipeline.

10. The method for combined cooling and heating of a ship engine room according to claim 9, characterized in that: When the ship needs to be supplied with fresh water, if the temperature of the water entering the temperature-controlled water tank is lower than the set value, the flow of water entering the fresh water inlet pipe through the fresh water cold water supply pipe will be reduced, and the flow of water entering the fresh water inlet pipe through the temperature-controlled water tank will be increased.

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