Marine seawater source heat pump air-conditioning system

Abstract

A main pipeline section, a refrigeration mode pipeline section and a heating mode pipeline section in the marine seawater source heat pump air conditioning system are arranged in parallel, a seawater supply unit is communicated with a heat exchanger, and a condenser in a heat pump unit is communicated with the middle of the refrigeration mode pipeline section. Two three-way valves are arranged on the portions, located on the two sides of the condenser, of the refrigeration mode pipeline section at intervals, the two ends of the main pipeline section and the two ends of the heating mode pipeline section communicate with the two three-way valves located on the outer side, and the two ends of the heating medium water pipeline section communicate with the two electromagnetic valves located on the inner side correspondingly. The middle of the heating mode pipeline section is communicated with an evaporator in the heat pump unit, three-way valves are respectively arranged on the heating mode pipeline section on two sides of the evaporator, and two ends of the refrigerant water pipeline section are respectively communicated with the two three-way valves on the heating mode pipeline section. By the adoption of the air conditioning system, in spring and summer, when the cold / heat load of the system is relatively low, the overall energy consumption of the system is reduced, and the heat comfort of a cabin is maintained.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of ship manufacturing, and particularly relates to a marine seawater source heat pump air conditioning system. BACKGROUND

[0002] As a major energy consumer and emitter, ships are in a very serious situation of energy saving and emission reduction, and it is of great practical significance to make technical transformation for emission reduction. It is of great research significance to replace the traditional ship air conditioning device with a green energy system-seawater source heat pump system which is mainly characterized by high efficiency, energy saving and environmental protection. The seawater source heat pump technology is to extract heat or release heat from seawater by using a small amount of electric energy to achieve the purpose of heat extraction / cooling. The whole heating / cooling process does not pollute the air and water source. Therefore, from the perspective of environmental protection and energy comprehensive utilization, the marine seawater source heat pump air conditioning system has a good application prospect. SUMMARY

[0003] In view of the above problems, the application provides a marine seawater source heat pump air conditioning system.

[0004] To achieve the above-mentioned purpose, the application adopts the following technical scheme: A marine seawater source heat pump air conditioning system, comprising a heat pump unit, an air conditioning terminal AHU, a seawater supply unit, a cooling water circulation pipeline, a refrigerant water pipeline section and a heat medium water pipeline section, the cooling water circulation pipeline comprises a main pipeline section, a refrigeration mode pipeline section and a heating mode pipeline section which are provided with a cooling water circulation pump unit and a heat exchanger, the main pipeline section, the refrigeration mode pipeline section and the heating mode pipeline section are arranged in parallel, the seawater supply unit is communicated with the heat exchanger, a condenser in the heat pump unit is communicated with the middle part of the refrigeration mode pipeline section, two three-way valves are arranged on the refrigeration mode pipeline section on both sides of the condenser, both ends of the main pipeline section and the heating mode pipeline section are communicated with two three-way valves on the outer side, both ends of the heat medium water pipeline section are respectively communicated with two electromagnetic valves on the inner side, the middle part of the heating mode pipeline section is communicated with an evaporator in the heat pump unit, one three-way valve is arranged on the heating mode pipeline section on both sides of the evaporator, both ends of the refrigerant water pipeline section are respectively communicated with two three-way valves on the heating mode pipeline section; the refrigerant water pipeline section and the heat medium water pipeline section pass through the air conditioning terminal AHU, and a refrigerant water circulation pump unit and a heat medium water circulation pump unit are arranged on the refrigerant water pipeline section and the heat medium water pipeline section respectively.

[0005] Further, the system further comprises a PLC control box and a frequency converter platform, a plurality of temperature sensors, a differential pressure sensor and a VAV terminal controller, the fan in the air conditioner AHU is a variable frequency fan, the plurality of temperature sensors are respectively arranged in each cabin, on the return air duct, on the air supply end of the air conditioner terminal AHU and on the air inlet duct of the air conditioner, the variable frequency fan, the seawater supply unit, the cooling water circulation unit, the refrigerant water circulation pump unit, the plurality of temperature sensors, the differential pressure sensor, the VAV terminal controller and the heat medium water circulation pump unit are in electrical control connection with the PLC control box.

[0006] Further, the system further comprises an adjustable air shutter mechanism, the adjustable air shutter mechanism comprises a fresh air shutter arranged on the air supply duct, an exhaust air shutter arranged on the exhaust air duct and an internal circulation air shutter arranged between the air supply duct and the exhaust air duct, and the fresh air shutter, the exhaust air shutter and the internal circulation air shutter are in electrical control connection with the control system.

[0007] Further, the main pipeline section and the refrigeration mode pipeline section form a refrigeration mode cooling water circulation pipeline, the refrigeration mode cooling water circulation pipeline further comprises a heat exchanger dosing pipeline located between and connected in parallel with the main pipeline section and the refrigeration mode pipeline section, and a heat exchanger dosing device is arranged on the heat exchanger dosing pipeline.

[0008] Further, a detection air vent and a cooling water expansion tank are connected through a pipeline on the main pipeline section connected with the outlet side of the cooling water circulation pump unit, and a safety valve is connected through another pipeline on the pipeline connected with the cooling water expansion tank.

[0009] Further, a bleed-off pipeline and a cooling water water adding valve group are connected on the inlet end side of the main pipeline section, and the cooling water water adding valve group is located between the heat exchanger and the bleed-off pipeline.

[0010] Further, a pre-heater is arranged on the heat medium water pipeline section, the pre-heater is located between the condenser water outlet and the hot water circulation pump unit, and a three-way valve is arranged between the condenser water outlet and the pre-heater.

[0011] Further, a refrigerant water expansion tank, a detection air vent, a discharge pipeline and a refrigerant water water adding valve group are arranged on the refrigerant water pipeline section, the refrigerant water expansion tank and the detection air vent are located between the air conditioning terminal AHU and the evaporator water inlet, the discharge pipeline and the refrigerant water water adding valve group are located between the refrigerant water circulating pump unit water outlet and the air conditioning terminal AHU; a heat medium water expansion tank, a detection air vent, a discharge pipeline and a heat medium water water adding valve group are arranged on the heat medium water pipeline section, the heat medium water expansion tank and the detection air vent are located between the air conditioning terminal AHU and the condenser water inlet, the discharge pipeline and the heat medium water water adding valve group are located between the heat medium water circulating pump unit water outlet and the air conditioning terminal AHU.

[0012] Further, a refrigerant water medicine adding pipeline connected with the air conditioning terminal AHU in parallel is connected to the refrigerant water pipeline section, and a refrigerant water medicine adding device is arranged on the refrigerant water medicine adding pipeline; two ends of the refrigerant water medicine adding pipeline are located between the refrigerant water expansion tank and the detection air vent, and between the refrigerant water circulating pump water outlet and the refrigerant water water adding valve group, respectively; a heat medium water medicine adding pipeline connected with the air conditioning terminal AHU in parallel is connected to the heat medium water pipeline section, and a heat medium water medicine adding device is arranged on the heat medium water medicine adding pipeline; two ends of the heat medium water medicine adding pipeline are located between the heat medium water expansion tank and the detection air vent, and between the heat medium water circulating pump water outlet and the heat medium water water adding valve group, respectively.

[0013] Further, two ends of the heating mode pipeline section are communicated with two ends of the main pipeline section and two ends of the heating mode pipeline section through a third three-way valve and a fourth three-way valve, respectively, a first three-way valve and a second three-way valve are arranged at the middle part of the heating mode pipeline section, the first three-way valve and the second three-way valve are communicated with the water inlet and the water outlet of the condenser, respectively, a fifth three-way valve and a sixth three-way valve are communicated with the water inlet and the water outlet of the evaporator, respectively; the outlet end and the inlet end of the heat medium water pipeline section are communicated with the fifth three-way valve and the sixth three-way valve, respectively, and the outlet end and the inlet end of the refrigerant water pipeline section are communicated with the first three-way valve and the second three-way valve, respectively.

[0014] The marine seawater source heat pump air conditioning system of the application, in spring and summer seasons, the system cold / heat load is relatively low, in order to reduce the overall energy consumption of the system and maintain the cabin thermal comfort, the application controls the rotating speed of the refrigerant water circulating pump, the heat medium water circulating pump and the cooling water circulating pump, implements the variable water volume regulation strategy, and synchronously controls the rotating speed of the air conditioning terminal air supply fan, forms the "variable water volume + variable air volume" linkage response control mechanism. In the mode, the water pump operating frequency is dynamically adjusted according to the cabin temperature hysteresis, the refrigerant water temperature difference and the terminal load, the fan air volume automatically changes with the cabin heat load, so that the pump set energy consumption and the compressor start-stop frequency are reduced to the maximum extent while meeting the air conditioning load, and the application is suitable for the operating conditions with small temperature difference and frequent load fluctuation, such as spring and summer seasons, night mode, during the ocean voyage, etc. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 It is a principle schematic diagram of the seawater source marine heat pump air conditioning system of the embodiment of the application.

[0016] Figure 2 It is a principle schematic diagram of the seawater source marine heat pump air conditioning system of the embodiment of the application. Figure 1 It is a refrigerant water and cooling water flow direction schematic diagram of the seawater source marine heat pump air conditioning system in the application in the refrigeration mode.

[0017] Figure 3 It is a refrigerant water and cooling water flow direction schematic diagram of the seawater source marine heat pump air conditioning system in the application in the refrigeration mode. Figure 1 It is a heat medium water and cooling water flow direction schematic diagram of the seawater source marine heat pump air conditioning system in the application in the heating mode.

[0018] Figure 4 It is a heat medium water and cooling water flow direction schematic diagram of the seawater source marine heat pump air conditioning system in the application in the heating mode. Figure 1 It is an AHU internal structure schematic diagram of the seawater source marine heat pump air conditioning system in the application.

[0019] Figure 5 It is a variable air volume and variable water volume combined control schematic diagram of the application.

[0020] 1-cooling water circulating pump unit, 2-heat exchanger, 3-main pipe section, 4-refrigeration mode pipe section, 5-heating mode pipe section, 6-seawater pump unit, 7-seawater tank, 8-evaporator, 9-compressor unit, 10-condenser, 11-refrigerant water pipe section, 12-heat medium water pipe section, 13-heat medium water dosing device, 14-air conditioning terminal AHU, 15-refrigerant water circulating pump unit, 16-heat medium water circulating pump unit, 17-first three-way valve, 18-second three-way valve, 19-third three-way valve, 20-fourth three-way valve, 21-fifth three-way valve, 22-sixth three-way valve, 23-PLC control box and frequency converter platform, 24-temperature sensor, 25-pressure difference sensor, 26-VAV terminal controller, 27-frequency conversion fan, 28-cabin, 29-return air duct, 30-air conditioning terminal AHU air supply end, 31-fresh air damper, 32-exhaust air damper, 33-internal circulation damper, 34-heat exchanger dosing pipe, 35-heat exchanger dosing device, 36-detection air vent, 37-cooling water expansion tank, 38-safety valve, 39-bleed pipe, 40-cooling water water adding valve group, 41-pre-heater, 42-seventh three-way valve, 43-refrigerant water expansion tank, 44-refrigerant water water adding valve group, 45-heat medium water expansion tank, 46-heat medium water water adding valve group, 47-refrigerant water dosing pipe, 48-refrigerant water dosing device, 49-heat medium water dosing pipe, 50-control system, 51-air conditioning inlet duct. DETAILED DESCRIPTION

[0021] The application will be further described below in conjunction with the drawings and specific embodiments.

[0022] As Figure 1As shown, a marine seawater source heat pump air conditioning system includes a heat pump unit, an air conditioning terminal AHU 14, a seawater supply unit, a cooling water circulation pipeline, a refrigerant water pipeline section 11 and a heat medium water pipeline section 12, the heat pump unit includes an evaporator 8, a compressor unit 9 and a condenser 10, the seawater supply unit includes a seawater tank 7 and a seawater pump unit 6, the cooling water circulation pipeline includes a main pipeline section 3 provided with a cooling water circulation pump unit 1 and a heat exchanger 2, a refrigeration mode pipeline section 4 and a heating mode pipeline section 5, the main pipeline section 3, the refrigeration mode pipeline section 4 and the heating mode pipeline section 5 are arranged in parallel, the seawater pump unit 6 communicates with the heat exchanger 2, the condenser 10 in the heat pump unit communicates with the middle part of the refrigeration mode pipeline section 4, two three-way valves are arranged on the refrigeration mode pipeline section 4 on both sides of the condenser 10, both ends of the main pipeline section 3 and the heating mode pipeline section 5 communicate with two three-way valves on the outside, both ends of the heat medium water pipeline section 12 respectively communicate with two electromagnetic valves on the inside, the middle part of the heating mode pipeline section 5 communicates with the evaporator 8 in the heat pump unit, one three-way valve is arranged on the heating mode pipeline section 5 on both sides of the evaporator 8, both ends of the refrigerant water pipeline section 11 respectively communicate with the two three-way valves on the heating mode pipeline section 5; the refrigerant water pipeline section 11 and the heat medium water pipeline section 12 pass through the air conditioning terminal AHU 14, a refrigerant water circulation pump unit 15 and a heat medium water circulation pump unit 16 are arranged on the refrigerant water pipeline section 11 and the heat medium water pipeline section 12 respectively.

[0023] In the present application, the refrigerant water and the cooling water are mixed by ethylene glycol and deionized water in a mass ratio of 20%:80% to form ethylene glycol-water type refrigerant liquid. The refrigerant water has good anti-freezing performance, and the freezing point can be reduced to about -7°C to -10°C, which is suitable for low temperature circulation conditions of the ship in the cold zone or winter operation, effectively preventing system failure caused by pipeline freezing. In addition, the refrigerant water has good flowability and stable heat exchange performance, which is suitable for the heat exchange working condition requirements of the condenser 10 and the evaporator 8 in the heat pump circulation system. In order to ensure the stability of the refrigerant water quality in the long-period operation of the system, a refrigerant water dosing device is arranged in the system. The device can regularly add bactericides, corrosion inhibitors and scale inhibitors to the water system to avoid pipeline corrosion, microbial growth and scale blockage.

[0024] Specifically, two ends of the heating mode pipeline section 5 are communicated with two ends of the main pipeline section 3 through the third three-way valve 19 and the fourth three-way valve 20 respectively, the first three-way valve 17 and the second three-way valve 18 are arranged at the middle part of the heating mode pipeline section 5, the first three-way valve 17 and the second three-way valve 18 are communicated with the water inlet and the water outlet of the condenser respectively, the fifth three-way valve 21 and the sixth three-way valve 22 are communicated with the water inlet and the water outlet of the evaporator 8 respectively; the outlet end and the inlet end of the heat medium water pipeline section 12 are communicated with the fifth three-way valve 21 and the sixth three-way valve 22 respectively, the outlet end and the inlet end of the cold medium water pipeline section 11 are communicated with the first three-way valve 17 and the second three-way valve 18 respectively.

[0025] Further, the pre-heater 41 is arranged on the heat medium water pipeline section 12, the pre-heater 41 is located between the water outlet of the condenser 10 and the hot water circulating pump unit, and the seventh three-way valve 42 is arranged between the water outlet of the condenser 10 and the pre-heater 41.

[0026] It can be understood that, in the heating mode of the application, the pre-heater 41 is arranged in the heat medium water circulating pipeline, which is used for auxiliary heating of the return water in the system starting stage or low temperature working condition. By opening the seventh three-way valve 42AB, the heat exchange condition of the condenser 10 is significantly improved by preliminary heating of the heat medium water, the heating efficiency and the starting stability are improved, and it is especially suitable for low temperature and high humidity or extremely cold sea area working condition. When the heat medium water does not need to be pre-heated, the seventh three-way valve 42AC is opened to form a circulating loop.

[0027] As Figure 2As shown, the refrigeration mode of the present application is the main operating mode of the system in a high temperature environment, used to reduce the temperature of the cabin of the ship, improve the comfort of the crew and the operating environment of the equipment. The operation process is as follows: after the compressor set 9 in the heat pump unit starts, low-temperature and low-pressure gaseous refrigerant from the evaporator 8 is sucked in and compressed into high-temperature and high-pressure gaseous refrigerant. The refrigerant gas is compressed into high-temperature and high-pressure gas by the compressor, and after being discharged, enters the condenser 10 to dissipate heat and is converted into high-pressure liquid. Open the fifth three-way valve 21AB, the sixth three-way valve 22AB, the third three-way valve 19BC and the fourth three-way valve 20BC, open the cooling water circulating pump, and the cooling water circulating pipeline in the refrigeration mode is formed, forming an efficient convective heat transfer environment. Specifically, the high-pressure liquid refrigerant is depressurized by the throttling device, enters the evaporator 8 to absorb heat and evaporates into a gaseous state, and the refrigerant is sucked back into the cycle by the compressor set 9. Heat is transferred from the condenser 10 to the cooling water, and then released to the sea through the sea water heat exchanger 2. In order to maintain the normal operation of the system, open the first three-way valve 17AC and the second three-way valve 18AC, open the refrigerant water circulating pump, and the refrigerant water circulating pipeline is formed. The refrigerant water provides heat for the evaporator 8 in the heat pump unit to evaporate into gaseous refrigerant. The refrigerant in the heat pump unit absorbs heat through the evaporator 8 to take away the heat in the refrigerant water, and the temperature of the refrigerant water is lowered. The refrigerant water circulating pump sends the cooled refrigerant water to the air conditioning terminal equipment (AHU), and exchanges heat with the air conditioning fresh air in the heat exchange coil of the AHU, absorbs the heat of the air, and sends the cooled air conditioning fresh air into the cabin. The refrigerant water returned after the air conditioning terminal is pumped back to the evaporator 8 in the heat pump unit for heat exchange, completing the closed cycle. This cycle realizes the reduction of the temperature of the cabin air, achieving the purpose of refrigeration. The heat released by the refrigerant through the condenser 10 is taken away by the cooling water circulating pipeline, and the cooling water circulating pipeline exchanges heat with the sea water through the heat exchanger 2 and finally releases the heat to the sea. The whole process does not cause any pollution to the water source.

[0028] As Figure 3As shown, the heating mode of the present application is the main operation mode of the system in a low temperature environment, the heat pump unit operates in the same way, the three-way valve first three-way valve 17BC, second three-way valve 18BC, third three-way valve 19AB and fourth three-way valve 20AB are opened, the cooling water circulating pump is opened, and the cooling water circulating pipeline in the heating mode is formed; the fifth three-way valve 21AC, the sixth three-way valve 22AC and the seventh three-way valve 42 are opened, the heat medium water circulating pump is opened, and the heat medium water circulating pipeline is formed. The heat medium water takes away the heat discharged from the condenser 10 in the heat pump unit, the temperature of the heat medium water is raised, and the heat medium water circulating pump sends the heated heat medium water to the air conditioning terminal equipment (AHU), and exchanges heat with the air conditioning fresh air in the AHU heat exchange coil, heats the air temperature, and sends the air conditioning fresh air into the cabin after heating. The heat medium water flowing back after the air conditioning terminal is pumped back to the condenser 10 in the heat pump unit for heat exchange, and the closed circulation is completed. This cycle realizes the increase of the cabin air temperature, and achieves the purpose of heating. The heat absorbed by the refrigerant through the evaporator 8 is provided by the cooling water circulating pipeline, and the cooling water circulating pipeline exchanges heat with seawater through the heat exchanger 2 and finally extracts heat from the sea, and the whole process will not cause any pollution to the water source.

[0029] Further, the system further comprises a PLC control box and a frequency converter platform 23, a plurality of temperature sensors 24, a differential pressure sensor 25 and a VAV terminal controller 26, which constitute a multi-parameter closed-loop control system based on load feedback; the fan in the air conditioner AHU is a variable frequency fan 27, a plurality of temperature sensors 24 are arranged in each cabin 28, on the return air duct 29, the air supply end 30 of the air conditioning terminal AHU and the air inlet pipe 51, the variable frequency fan 27, the refrigerant water circulating pump unit 15, a plurality of temperature sensors 24, the differential pressure sensor 25, the VAV terminal controller 26 and the heat medium water circulating pump unit 16 are in electrical control connection with the PLC control box, and the variable frequency fan 27, the refrigerant water circulating pump unit 15 and the heat medium water circulating pump unit 16 are in electrical control connection with the frequency conversion platform.

[0030] It can be understood that the control system adjusts the refrigerant water flow, heat medium water flow and air supply through the PLC control box and the frequency converter platform to realize the on-demand cooling / heating strategy according to the indoor thermal load dynamic response. The system first collects the operating parameters through the temperature and humidity and temperature difference sensors arranged in the cabin, air duct and loop, and automatically outputs the control signal to adjust the operating frequency of each water pump and fan after the PLC analyzes the load change trend in real time. When the load increases, the system synchronously increases the refrigerant / heat medium water flow and air supply to enhance the heat exchange capacity; when the load decreases, the system reduces the refrigerant / heat medium water circulation flow and fan speed to reduce energy consumption. Through the dynamic PID regulation algorithm, the "variable water volume + variable air volume" linkage control is realized, so that the air conditioning system can automatically match the operating condition according to the indoor and outdoor thermal load change, significantly improve the energy efficiency ratio and keep the cabin environment stable. The main process includes: In the cooling mode, the cooling water circulating pump is started in the running initialization stage to establish a stable flow on the primary side; the refrigerant water circulating pump and the AHU fan are started to operate at a low frequency; the cabin set temperature and actual temperature are collected, and the temperature difference ΔT is calculated. In the low load operation stage (such as in spring and summer), if ΔT≤1°C (set threshold), the system maintains low water volume / low air volume operation; the refrigerant water circulating pump speed and the AHU air supply frequency are controlled to maintain at 30-50%; the system keeps the air supply temperature stable to avoid overcooling, overheating or frequent start-stop of the compressor. In the medium and high load response stage: when ΔT>1°C, the control system issues instructions to gradually increase the refrigerant water circulating pump and fan frequency; the variable air volume terminal (VAV Box) adjusts the air supply volume to match the cabin demand; if necessary, the cooling water circulating pump is started for heat balance adjustment.

[0031] In the heating mode, after the control system detects that the cabin temperature is lower than the set threshold, it first starts the plate heat exchanger circulating pump to establish a small heat source circulation, and then starts the compressor for heating. When the condenser outlet water temperature reaches the preset starting temperature or the inlet and outlet water temperature difference is greater than 2°C, the heat medium water circulating pump is automatically started to deliver the heated refrigerant water to the air conditioning terminal equipment, realizing the heating of the ship cabin. When the cabin temperature reaches the set temperature range or the load decreases to a certain value, the heat medium water circulating pump enters a low-frequency maintenance operation or an automatic shutdown state, thereby realizing on-demand heating and energy-saving control.

[0032] Further, the system further comprises an adjustable air shutter mechanism, the adjustable air shutter mechanism comprises a fresh air shutter 31 arranged on the air supply pipeline, an exhaust air shutter 32 arranged on the exhaust air pipeline, and an internal circulation air shutter 33 arranged between the air supply pipeline and the exhaust air pipeline, and the fresh air shutter 31, the exhaust air shutter 32 and the internal circulation air shutter 33 are electrically connected with the control system.

[0033] The air conditioning system of the application is provided with an adjustable air damper mechanism to realize multi-mode air supply and exhaust control, so as to avoid the entry of dust, hot and humid gas or harmful gas into the cabin of the ship through fresh air during loading and unloading or short stay in port.

[0034] Further, the main pipe section 3 and the refrigeration mode pipe section 4 form a refrigeration mode cooling water circulation pipeline, and the refrigeration mode cooling water circulation pipeline further comprises a heat exchanger dosing pipeline 34 connected in parallel with the main pipe section 3 and the refrigeration mode pipe section 4, and a heat exchanger dosing device 35 is arranged on the heat exchanger dosing pipeline 34.

[0035] Further, the main pipe section 3 connected to the outlet side of the cooling water circulation pump unit 1 is connected through a pipeline to a detection air vent 36 and a cooling water expansion tank 37, and a safety valve 38 is connected through another pipeline to the pipeline connected to the cooling water expansion tank 37.

[0036] Further, the inlet end side of the main pipe section 3 is connected to a bleed-off pipeline 39 and a cooling water water adding valve group 40, and the cooling water water adding valve group 40 is located between the heat exchanger 2 and the bleed-off pipeline 39.

[0037] Further, the refrigerant water pipeline section 11 is provided with a refrigerant water expansion tank 43, a detection air vent 36, a bleed-off pipeline 39 and a refrigerant water water adding valve group 44, the refrigerant water expansion tank 43 and the detection air vent 36 are located between the air conditioning terminal AHU 14 and the water inlet of the evaporator 8, and the bleed-off pipeline 39 and the refrigerant water water adding valve group 44 are located between the water outlet of the refrigerant water circulation pump unit 15 and the air conditioning terminal AHU 14; the heat medium water pipeline section 12 is provided with a heat medium water expansion tank 45, a detection air vent 36, a bleed-off pipeline 39 and a heat medium water water adding valve group 46, the heat medium water expansion tank 45 and the detection air vent 36 are located between the air conditioning terminal AHU 14 and the water inlet of the condenser 10, and the bleed-off pipeline 39 and the heat medium water water adding valve group 46 are located between the water outlet of the heat medium water circulation pump unit 16 and the air conditioning terminal AHU 14.

[0038] Further, the refrigerant water pipeline section 11 is connected with the refrigerant water dosing pipeline 47 parallel to the air conditioning terminal AHU 14, and the refrigerant water dosing device 48 is arranged on the refrigerant water dosing pipeline 47; the two ends of the refrigerant water dosing pipeline 47 are located between the refrigerant water expansion tank 43 and the detection air vent 36, between the refrigerant water circulating pump outlet and the refrigerant water water adding valve group 44; the heat medium water pipeline section 12 is connected with the heat medium water dosing pipeline 49 parallel to the air conditioning terminal AHU 14, and the heat medium water dosing device 13 is arranged on the heat medium water dosing pipeline 49; the two ends of the heat medium water dosing pipeline 49 are located between the heat medium water expansion tank 45 and the detection air vent 36, between the heat medium water circulating pump outlet and the heat medium water water adding valve group 46.

[0039] The refrigerant water circulating pipeline, the heat medium water circulating pipeline and the cooling water circulating pipeline of the present application are provided with a pressure stabilizing expansion tank, which is used to guarantee the pressure balance of the pipeline and the volume change caused by temperature change. When the temperature of the pipeline medium rises and the water volume expands, the excess water enters the expansion tank; when the water temperature decreases and the volume shrinks, the expansion tank replenishes the system water. In addition, a pressure safety valve 38 is arranged at the inlet and outlet of the pressure stabilizing expansion tank, which is used to prevent the system from overpressure caused by water volume expansion, pipeline blockage or pump pressure being too high under special working conditions. When the system pressure exceeds the set value (such as 0.4 MPa), the pressure relief is automatically opened to discharge the excess water or air, so as to ensure that the system pressure is always maintained within a safe range, and the structural integrity of the pipeline, pump body and expansion tank body is protected.

[0040] The refrigerant water circulating pipeline, the heat medium water circulating pipeline and the cooling water circulating pipeline of the present application are provided with three types of interfaces of detection air vent 36, discharge pipeline 39 and water adding valve group. The detection air vent 36 is arranged at the high point of the loop, which is used to discharge the system gas before initial operation or after liquid supplement, so as to prevent the gas blockage phenomenon from affecting the flow and heat exchange efficiency; the discharge pipeline 39 is arranged at the lowest point of the pipeline, which is used for system drainage, pressure relief or maintenance operation; the water adding valve group is arranged at the outlet and inlet section of the cold and hot medium water pump, which is used for initial filling and liquid supplement during operation. The above three types of interfaces enhance the safety of system operation, the convenience of maintenance and the controllability of operating conditions, which are important auxiliary designs for the system to adapt to the complex operating environment of the ship.

[0041] The seawater source marine heat pump air conditioning system in the embodiment of the present application further comprises an energy recovery device, which comprises a rotating heat recovery runner arranged between the fresh air channel and the exhaust air channel, a variable frequency motor driving the runner to rotate at a low speed, a supply air duct and an exhaust air duct with a damper control, an adapted air handling unit (AHU), a filtering section, a heating / cooling section, a fan section, etc. Specifically, the fresh air and the exhaust air flow through the two sides of the runner respectively, and the air exchanges heat and mass with the surface of the runner when passing through the runner. The runner rotates to bring the heat in the exhaust air to the fresh air side, thereby realizing heat recovery preprocessing. The large runner is automatically adjusted in speed by a PLC controller, and is synchronously linked with the damper, the fan and the main system. Specifically, when the air conditioning system is started, the fan is started and the large runner is automatically rotated; the speed of the runner can be automatically adjusted according to the temperature difference between the fresh air and the exhaust air (the greater the temperature difference, the higher the speed); during the berthing or loading and unloading operation, the fresh air damper and the exhaust air damper 32 can be closed by remote manual operation control, and the runner stops running, so as to avoid energy recovery pollution or external air interference; the operating parameters (temperature rise, temperature drop, humidity change, etc.) of the runner can be connected to the energy consumption analysis system as energy saving indexes.

[0042] It should be understood by those skilled in the art that the above only describes specific embodiments of the present application and is not intended to limit the present application. Any modification, equivalent replacement, improvement, etc. within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A marine seawater source heat pump air conditioning system, characterized in that, The system comprises a heat pump unit, an air conditioner terminal AHU, a seawater supply unit, a cooling water circulation pipeline, a refrigerant water pipeline section and a heat medium water pipeline section, the cooling water circulation pipeline comprises a main pipeline section, a refrigeration mode pipeline section and a heating mode pipeline section provided with a cooling water circulation pump unit and a heat exchanger, the main pipeline section, the refrigeration mode pipeline section and the heating mode pipeline section are arranged in parallel, the seawater supply unit is communicated with the heat exchanger, a condenser in the heat pump unit is communicated with a middle part of the refrigeration mode pipeline section, two three-way valves are arranged on the refrigeration mode pipeline section on both sides of the condenser, both ends of the main pipeline section and the heating mode pipeline section are communicated with two three-way valves on the outer side, both ends of the heat medium water pipeline section are communicated with two electromagnetic valves on the inner side, a middle part of the heating mode pipeline section is communicated with an evaporator in the heat pump unit, one three-way valve is arranged on the heating mode pipeline section on both sides of the evaporator, and both ends of the refrigerant water pipeline section are communicated with the two three-way valves on the heating mode pipeline section.

2. Marine seawater source heat pump air conditioning system according to claim 1, characterized in that The system further comprises a PLC control box, a plurality of temperature sensors, a differential pressure sensor and a VAV terminal controller, the fan in the air conditioner AHU is a variable frequency fan, the plurality of temperature sensors are arranged in each cabin, on the return air duct, the air supply end of the air conditioner terminal AHU and the air inlet duct of the air conditioner, the variable frequency fan, the seawater supply unit, the cooling water circulation unit, the refrigerant water circulation pump unit, the plurality of temperature sensors, the differential pressure sensor, the VAV terminal controller and the heat medium water circulation pump unit are electrically connected to the PLC control box.

3. Marine seawater source heat pump air conditioning system according to claim 2, characterized in that, The system further comprises an adjustable air shutter mechanism, the adjustable air shutter mechanism comprises a fresh air shutter arranged on the air supply duct, an exhaust air shutter arranged on the exhaust air duct and an internal circulation air shutter arranged between the air supply duct and the exhaust air duct, and the fresh air shutter, the exhaust air shutter and the internal circulation air shutter are electrically connected to the control system.

4. The marine seawater source heat pump air conditioning system of claim 1, wherein, The main pipeline section and the refrigeration mode pipeline section form a refrigeration mode cooling water circulation pipeline, and the refrigeration mode cooling water circulation pipeline further comprises a heat exchanger dosing pipeline connected in parallel with the main pipeline section and the refrigeration mode pipeline section, and a heat exchanger dosing device is arranged on the heat exchanger dosing pipeline.

5. The marine seawater source heat pump air conditioning system of claim 1, wherein, A detection air vent and a cooling water expansion tank are connected to the main pipeline section on the outlet side of the cooling water circulation pump unit through a pipeline, and a safety valve is connected to the pipeline connected to the cooling water expansion tank through another pipeline.

6. The marine seawater source heat pump air conditioning system of claim 1, wherein, A relief pipeline and a cooling water water adding valve group are connected to the inlet end side of the main pipeline section, and the cooling water water adding valve group is located between the heat exchanger and the relief pipeline.

7. The marine seawater source heat pump air conditioning system of claim 1, wherein, The pre-heater is arranged on the heat medium water pipeline section, is located between the condenser water outlet and the hot water circulating pump unit, and a three-way valve is arranged between the condenser water outlet and the pre-heater.

8. The marine seawater source heat pump air conditioning system of claim 1, wherein, The refrigerant water expansion tank and the detection air vent are located between the air conditioning terminal AHU and the evaporator water inlet, and the discharge pipeline and the refrigerant water water adding valve group are located between the refrigerant water circulating pump unit water outlet and the air conditioning terminal AHU; the heat medium water expansion tank and the detection air vent are located between the air conditioning terminal AHU and the condenser water inlet, and the discharge pipeline and the heat medium water water adding valve group are located between the heat medium water circulating pump unit water outlet and the air conditioning terminal AHU.

9. The marine seawater source heat pump air conditioning system of claim 8, wherein, The refrigerant water medicament adding pipeline connected in parallel with the air conditioning terminal AHU is connected to the refrigerant water pipeline section, and a refrigerant water medicament adding device is arranged on the refrigerant water medicament adding pipeline; the two ends of the refrigerant water medicament adding pipeline are located between the refrigerant water expansion tank and the detection air vent and between the refrigerant water circulating pump water outlet and the refrigerant water water adding valve group, respectively; the heat medium water medicament adding pipeline connected in parallel with the air conditioning terminal AHU is connected to the heat medium water pipeline section, and a heat medium water medicament adding device is arranged on the heat medium water medicament adding pipeline; the two ends of the heat medium water medicament adding pipeline are located between the heat medium water expansion tank and the detection air vent and between the heat medium water circulating pump water outlet and the heat medium water water adding valve group, respectively.

10. The marine seawater source heat pump air conditioning system of claim 1, wherein, The two ends of the heating mode pipeline section are communicated with the two ends of the main pipeline section and the two ends of the heating mode pipeline section through the third three-way valve and the fourth three-way valve, respectively, first and second three-way valves are arranged at the middle part of the heating mode pipeline section in intervals, the first three-way valve and the second three-way valve are communicated with the water inlet and the water outlet of the condenser, respectively, and fifth and sixth three-way valves are communicated with the water inlet and the water outlet of the evaporator, respectively; the outlet end and the inlet end of the heat medium water pipeline section are communicated with the fifth three-way valve and the sixth three-way valve, respectively, and the outlet end and the inlet end of the refrigerant water pipeline section are communicated with the first three-way valve and the second three-way valve, respectively.

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