CN111692660A - Anti-condensation convection-radiation composite air conditioning system and working method thereof - Google Patents
Anti-condensation convection-radiation composite air conditioning system and working method thereof Download PDFInfo
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- CN111692660A CN111692660A CN202010511355.2A CN202010511355A CN111692660A CN 111692660 A CN111692660 A CN 111692660A CN 202010511355 A CN202010511355 A CN 202010511355A CN 111692660 A CN111692660 A CN 111692660A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F5/00—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater
- F24F5/0003—Exclusively-fluid systems
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
- F24F11/41—Defrosting; Preventing freezing
- F24F11/43—Defrosting; Preventing freezing of indoor units
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
- F24F11/63—Electronic processing
- F24F11/64—Electronic processing using pre-stored data
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
- F24F11/63—Electronic processing
- F24F11/65—Electronic processing for selecting an operating mode
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/89—Arrangement or mounting of control or safety devices
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
- F24F13/24—Means for preventing or suppressing noise
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F3/00—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems
- F24F3/12—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems characterised by the treatment of the air otherwise than by heating and cooling
- F24F3/14—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems characterised by the treatment of the air otherwise than by heating and cooling by humidification; by dehumidification
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F3/00—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems
- F24F3/12—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems characterised by the treatment of the air otherwise than by heating and cooling
- F24F3/14—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems characterised by the treatment of the air otherwise than by heating and cooling by humidification; by dehumidification
- F24F2003/144—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems characterised by the treatment of the air otherwise than by heating and cooling by humidification; by dehumidification by dehumidification only
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
- F24F13/24—Means for preventing or suppressing noise
- F24F2013/247—Active noise-suppression
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F2110/00—Control inputs relating to air properties
- F24F2110/10—Temperature
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F2110/00—Control inputs relating to air properties
- F24F2110/20—Humidity
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Abstract
The invention discloses an anti-condensation convection-radiation composite air conditioning system and a working method thereof. When the system runs in summer, the tail end of a fan coil is utilized to eliminate indoor latent heat and partial sensible heat, the radiation plate eliminates the residual indoor sensible heat, different running modes are realized through reasonable control, and the effects of refrigeration and dehumidification are achieved; different modes of operation can be realized according to the requirements during winter operation, and the effects of energy conservation and comfort are achieved. The invention effectively improves the utilization rate of the tail end of the air conditioner, overcomes the defects of strong blowing sense, large noise, large power and the like when the fan coil works, and more importantly solves the problem of dewing on the surface of the radiation plate during the refrigeration operation in the prior art.
Description
Technical Field
The invention relates to the technical field of heating ventilation air conditioners, in particular to an anti-condensation convection-radiation composite air conditioning system.
Background
The convection-radiation air conditioning system is a new type composite air conditioning system utilizing radiation heat exchange and convection heat exchange. The radiation refrigeration (heating) breaks through the traditional air supply and air conditioning mode which takes convection as a main mode, increases the radiation heat exchange between a human body and the enclosure structure and between the enclosure structure and the enclosure structure, can effectively eliminate the load of the wall of a room, creates a more comfortable living environment for people, solves the problem of condensation in summer due to the existing radiation plate cooling, cannot effectively realize the purpose of refrigeration in summer, can be opened only when heating in winter, and has low utilization rate. Based on this, further optimization and improvement need to be carried out on the original system, condensation is effectively prevented, and the feasibility of practical application is increased.
In the prior art, chinese patent with publication number CN207622177U proposes a temperature and humidity independent radiation cooling and heating air conditioning system, which includes: the system comprises an air source heat pump unit, a total heat exchange fresh air dehumidifier, a controller of the air source heat pump unit, a ground pipeline radiation system and the like. This patent is in the same place fresh air unit and ground radiation system combination, realizes the purpose of constant temperature, humidity and oxygen, only uses new fan group to handle the new trend, relies on ground radiation system to cool off the room air, and the room air does not have dehumidification, and this patent only is applicable to the big building of fresh air volume, can not be used to the building that fresh air volume is little, and indoor humidity is big.
In the prior art, a chinese patent with an authorization publication number of CN205037400U proposes a cooling and heating system based on an air-cooled heat pump. The method comprises the following steps: an air-cooled heat pump, a fan coil system and a radiant panel radiant system. The tail end of a fan coil is adopted for refrigeration in summer, and the tail end of a radiation plate is adopted for heating in winter, so that the equipment utilization rate is reduced, and the economy is not high.
Disclosure of Invention
The invention aims to overcome the problems and the defects in the prior art and provide a convection-radiation composite air conditioning system which can effectively prevent condensation and improve the utilization rate of a radiation plate so as to solve the problems in the background art.
The invention adopts the fan coil end equipment to process the indoor air, and solves the problem that the surface of the radiant panel is easy to dewing during cooling by controlling the operation mode. The end equipment is shared during the operation of refrigeration and heating, the utilization rate of the equipment is improved, the equipment load can be reduced, the cost is reduced, and the system economy is improved.
In order to achieve the purpose, the invention adopts the following technical scheme to realize the purpose:
an anti-dewing convection-radiation composite air conditioning system comprises an outdoor host module, a hydraulic module, a water tank, a fan coil, a radiation tail end, an electromagnetic valve, an electric two-way valve, a three-way valve and a first cold and hot water circulating pump. Wherein the hydraulic module comprises a heat exchanger, a second cold and hot water circulating pump and a system controller, ends a and b of the heat exchanger are respectively connected to the outdoor host module through pipelines, end c of the heat exchanger is respectively connected with the inlet of the fan coil and the inlet of the electromagnetic valve through pipelines, end d of the heat exchanger is connected with the outlet of the second cold and hot water circulating pump through a pipeline, the inlet of the second cold and hot water circulating pump is connected with end b of the water tank through a pipeline, the outlet of the electromagnetic valve is connected with end a of the water tank through a pipeline, end c of the water tank is connected with end a of the three-way valve through a pipeline, end b of the three-way valve is connected with the inlet of the first cold and hot water circulating pump through a pipeline, the outlet of the first cold and hot water circulating pump is connected with the inlet of the radiation end through a pipeline, and the outlet of the radiation end, the outlet of the fan coil is sequentially connected with the electric two-way valve to the d end of the water tank through a pipeline; a first temperature sensor and a first humidity sensor are installed at the air return opening of the fan coil; a water supply pipe and a water return pipe at the radiation tail end are respectively provided with a second temperature sensor and a third temperature sensor; a fourth temperature sensor is arranged on a pipeline between the end b of the water tank and the inlet of the second cold and hot water circulating pump; a differential pressure sensor is arranged between the water supply pipe and the water return pipe at the radiation tail end; the control end of the system controller is respectively connected with the control end of the outdoor host module, the motor of the fan coil, the electromagnetic valve, the electric two-way valve and the control end of the three-way valve through leads; and the receiving end of the system controller is respectively connected with the first temperature sensor, the second temperature sensor, the third temperature sensor, the fourth temperature sensor, the humidity sensor and the differential pressure sensor through leads.
Further preferably, the three-way valve is a proportional control valve.
Further preferably, the number of rows of heat exchanger tubes of the fan coil is at least 3.
Further preferably, the electromagnetic valve is a one-way electromagnetic valve.
The working method of the anti-condensation convection-radiation composite air-conditioning system is divided into the following four working modes according to the operation purpose:
(1) fast heating mode
When the rapid heating mode is operated, the outdoor host module is in a heating operation state, the electromagnetic valve is in a closed state, and the first cold and hot water circulating pump, the second cold and hot water circulating pump, the electric two-way valve and the b and c ends of the three-way valve are in an open state. And hot water enters the fan coil for heating and then enters the d end of the water tank through the electric two-way valve. When the temperature value of the second temperature sensor received in the system controller is lower than the heating set value, the end a of the three-way valve is gradually opened according to a certain proportion (for example, 10%), and hot water in the water tank sequentially passes through the ends a and b of the three-way valve and the first cold and hot water circulating pump to enter the radiation tail end. And when the difference value of the measured values of the second temperature sensor and the third temperature sensor received in the system controller is smaller than the temperature difference set value, closing the end a of the three-way valve, and circulating in sequence.
(2) Heating sleep mode
When the heating sleep mode is operated, the outdoor host module is in a heating operation state, the electric two-way valve is in a closed state, and the first cold and hot water circulating pump, the second cold and hot water circulating pump, the electromagnetic valve and the b and c ends of the three-way valve are in an open state. Hot water sequentially enters the end a of the water tank through the electromagnetic valve; when the temperature value of the second temperature sensor received by the system controller is lower than the heating set value, the end a of the three-way valve is gradually opened according to a certain proportion (for example, 10%), and hot water in the water tank sequentially passes through the ends a and b of the three-way valve and the first cold and hot water circulating pump to enter the radiation tail end. And when the difference value of the measured values of the second temperature sensor and the third temperature sensor received in the system controller is smaller than the temperature difference set value, closing the end a of the three-way valve, and circulating in sequence.
(3) High efficiency refrigeration dehumidification mode
When the high-efficiency refrigeration and dehumidification mode is operated, the outdoor host module is in a refrigeration operation state, the electromagnetic valve, the first cold and hot water circulating pump and the a end of the three-way valve are in a closed state, and the second cold and hot water circulating pump, the electric two-way valve and the b end and the c end of the three-way valve are in an open state. And cold water enters the fan coil for refrigeration and then enters the d end of the water tank through the electric two-way valve. And the system controller controls the fan coil motor to operate at high frequency.
(4) Refrigerated sleep mode
When the refrigeration sleep mode is operated, the outdoor host module is in a refrigeration operation state, the electromagnetic valve is in a closed state, the first cold and hot water circulating pump, the second cold and hot water circulating pump, the electric two-way valve and the b and c ends of the three-way valve are in an open state, and the fan of the fan coil is in a low-speed operation state. Cold water enters the fan coil for refrigeration and then enters the d end of the water tank through the electric two-way valve, and the system controller controls the fan coil motor to operate at low frequency. When the system controller receives that a signal of a humidity sensor at an air return opening of the fan coil is lower than a set value, the first cold and hot water circulating pump operates, cold water is self-circulated in the radiation tail end, when the system controller receives that a temperature value of the second temperature sensor is higher than the set value, an a end of the three-way valve is gradually opened according to a certain proportion (for example, 10%), and cold water of the water tank sequentially passes through the a end and a b end of the three-way valve and enters the radiation tail end through the first cold and hot water circulating pump. And when the difference value of the measured values of the second temperature sensor and the third temperature sensor received in the system controller is smaller than the temperature difference set value, closing the end a of the three-way valve, and circulating in sequence.
Compared with the prior art, the invention has the following advantages and beneficial effects:
1. the invention eliminates indoor latent heat and partial sensible heat through the fan coil in summer, and eliminates the residual indoor sensible heat by utilizing the radiation plate, thereby achieving the effects of refrigeration and dehumidification, effectively improving the utilization rate of the radiation plate, simultaneously solving the defects of strong blowing sense, large noise, large power and the like caused by the working of only the fan coil, providing more comfortable living environment for people, and having wide application prospect.
2. The refrigeration sleep mode reduces the fan rotating speed of the fan coil on the premise of ensuring that the surface of the radiation plate is not dewed, thereby not only eliminating discomfort caused by blowing sense, but also reducing the energy consumption of the system.
Drawings
FIG. 1 is a schematic diagram of the system of the present invention.
The reference numbers in the figures illustrate: the system comprises an outdoor host module 1, a hydraulic module 2, a heat exchanger 2-1, a cold and hot water circulating pump 2-2, a system controller 2-3, a water tank 3, a fan coil 4, a radiation tail end 5, an electromagnetic valve 6, an electric two-way valve 7, a three-way valve 8, a cold and hot water circulating pump 9, a first temperature sensor 10-1, a second temperature sensor 10-2, a third temperature sensor 10-3, a fourth temperature sensor 10-4, a humidity sensor 11 and a differential pressure sensor 12.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention are described in further detail below with reference to the accompanying drawings and embodiments.
Furthermore, the letter terms mentioned in the present invention, such as a, b, c, d, etc., refer to the inlet and outlet of the drawings only. Accordingly, the use of alphabetic terms is intended to illustrate and understand the present invention and is not intended to limit the invention.
As shown in fig. 1, the dewing-proof convection-radiation composite air conditioning system comprises an outdoor host module 1, a hydraulic module 2, a water tank 3, a fan coil 4, a radiation terminal 5, an electromagnetic valve 6, an electric two-way valve 7, a three-way valve 8 and a first cold and hot water circulating pump 9. The hydraulic module 2 comprises a heat exchanger 2-1, a second cold and hot water circulating pump 2-2 and a system controller 2-3, ends a and b of the heat exchanger 2-1 are connected with an outdoor host module 1 through pipelines, an end c of the heat exchanger 2-1 is respectively connected with an inlet of the fan coil 4 and an inlet of the electromagnetic valve 6 through pipelines, an end d of the heat exchanger 2-1 is connected with an outlet of the second cold and hot water circulating pump 2-2 through a pipeline, an inlet of the second cold and hot water circulating pump 2-2 is connected with an end b of the water tank 3 through a pipeline, an outlet of the electromagnetic valve 6 is connected with an end a of the water tank 3 through a pipeline, an end c of the water tank 3 is connected with an end a of the three-way valve 8 through a pipeline, and an end b of the three-way valve 8 is connected with an inlet, an outlet of the first cold and hot water circulating pump 9 is connected with an inlet of the radiation tail end 5 through a pipeline, an outlet of the radiation tail end 5 is respectively connected with the c end of the three-way valve 8 and the d end of the water tank 3 through pipelines, and an outlet of the fan coil 4 is sequentially connected with the electric two-way valve 7 to the d end of the water tank 3 through a pipeline; a first temperature sensor 10-1 and a humidity sensor 11 are installed at a return air inlet of the fan coil 4; a water supply pipe and a water return pipe of the radiation tail end 5 are respectively provided with a second temperature sensor 10-2 and a third temperature sensor 10-3; a fourth temperature sensor 10-4 is arranged on a pipeline between the end of the water tank 3b and the inlet of the second cold and hot water circulating pump 2-2; a differential pressure sensor 12 is arranged between a water supply pipe and a water return pipe of the radiation tail end 5; the control ends of the system controllers 2 to 3 are respectively connected with the control end of the outdoor host module 1, the motor of the fan coil 4, the electromagnetic valve 6, the electric two-way valve 7 and the control end of the three-way valve 8 through leads; the receiving end of the system controller 2-3 is respectively connected with a first temperature sensor 10-1, a second temperature sensor 10-2, a third temperature sensor 10-3, a fourth temperature sensor 10-4, a humidity sensor 11 and a differential pressure sensor 12 through leads.
Wherein, the three-way valve 8 is a proportional control valve. And the number of the heat exchanger tube rows of the fan coil 4 is at least 3. The electromagnetic valve 6 is a one-way electromagnetic valve.
The working method of the anti-condensation convection-radiation composite air-conditioning system is divided into the following four working modes according to the operation purpose:
(1) fast heating mode
When the rapid heating mode is operated, the outdoor host module 1 is in a heating operation state, the electromagnetic valve 6 is in a closed state, and the b and c ends of the first cold and hot water circulating pump 9, the second cold and hot water circulating pump 2-2, the electric two-way valve 7 and the three-way valve 8 are in an open state. And hot water enters the fan coil 4 for heating and then enters the d end of the water tank 3 through the electric two-way valve 7. When the signal of the second temperature sensor 10-2 received in the system controller 2-3 is lower than the heating set value, the end a of the three-way valve 8 is gradually opened according to a certain proportion (for example, 10%), and the hot water in the water tank 3 sequentially passes through the ends a and b of the three-way valve 8 and the first cold and hot water circulating pump 9 to enter the radiation tail end 5. And when the difference value of the measured values of the second temperature sensor 10-2 and the third temperature sensor 10-3 received by the system controller 2-3 is smaller than the set temperature difference value, closing the end a of the three-way valve 8, and circulating in sequence.
(2) Heating sleep mode
When the heating sleep mode is operated, the outdoor host module 1 is in a heating operation state, the electric two-way valve 7 is in a closed state, and the b and c ends of the first cold and hot water circulating pump 9, the second cold and hot water circulating pump 2-2, the electromagnetic valve 6 and the three-way valve 8 are in an open state. Hot water sequentially enters the end a of the water tank 3 through the electromagnetic valve 6; when the temperature value of the second temperature sensor 10-2 received by the system controller 2-3 is lower than the heating set value, the end a of the three-way valve 8 is gradually opened according to a certain proportion (for example, 10%), and the hot water in the water tank 3 sequentially passes through the ends a and b of the three-way valve 8 and the first cold and hot water circulating pump 9 to enter the radiation tail end 5. And when the difference value of the measured values of the second temperature sensor 10-2 and the third temperature sensor 10-3 received by the system controller 2-3 is smaller than the set temperature difference value, closing the end a of the three-way valve 8, and circulating in sequence.
(3) High efficiency refrigeration dehumidification mode
When the high-efficiency refrigeration and dehumidification mode is operated, the outdoor host module 1 is in a refrigeration operation state, the electromagnetic valve 6, the first cold and hot water circulating pump 9 and the a end of the three-way valve 8 are in a closed state, and the second cold and hot water circulating pump 2-2, the electric two-way valve 7 and the b end and the c end of the three-way valve 8 are in an open state. Cold water enters the fan coil 4 for refrigeration, and then enters the d end of the water tank 3 through the electric two-way valve 7. And the system controller 2-3 controls the fan coil 4 motor to operate at high frequency.
(4) Refrigerated sleep mode
When the cooling sleep mode is operated, the outdoor host module 1 is in a cooling operation state, the electromagnetic valve 6 is in a closed state, the first cold and hot water circulating pump 9, the second cold and hot water circulating pump 2-2, the electric two-way valve 7 and the b and c ends of the three-way valve 8 are in an open state, and the fan of the fan coil 4 is in a low-speed operation state. Cold water enters the fan coil 4 for refrigeration, then enters the d end of the water tank 3 through the electric two-way valve 7, and the system controller 2-3 controls the motor of the fan coil 4 to operate at low frequency. When the system controller 2-3 receives that a signal of a humidity sensor 11 at an air return port of the fan coil 4 is lower than a set value, the first cold and hot water circulating pump 9 operates, cold water performs self-circulation in the radiation tail end 5, when the system controller 2-3 receives that a temperature value of the second temperature sensor 10-2 is higher than the set value, an a end of the three-way valve 8 is gradually opened according to a certain proportion (for example, 10%), and cold water of the water tank 3 sequentially passes through the a end and a b end of the three-way valve 8 and the first cold and hot water circulating pump 9 to enter the radiation tail end 5. And when the difference value of the measured values of the second temperature sensor 10-2 and the third temperature sensor 10-3 received by the system controller 2-3 is smaller than the set temperature difference value, closing the end a of the three-way valve 8, and circulating in sequence.
The above description is only of the preferred embodiments of the present invention, and it should be noted that: it will be apparent to those skilled in the art that various modifications and adaptations can be made without departing from the principles of the invention and these are intended to be within the scope of the invention.
Claims (5)
1. The anti-condensation convection-radiation composite air conditioning system is characterized by comprising an outdoor host module (1), a hydraulic module (2), a water tank (3), a fan coil (4), a radiation tail end (5), an electromagnetic valve (6), an electric two-way valve (7), a three-way valve (8) and a first cold and hot water circulating pump (9), wherein the hydraulic module (2) comprises a heat exchanger (2-1), a second cold and hot water circulating pump (2-2) and a system controller (2-3), ends a and b of the heat exchanger (2-1) are respectively connected to the outdoor host module (1) through pipelines, the end c of the heat exchanger (2-1) is respectively connected with an inlet of the fan coil (4) and an inlet of the electromagnetic valve (6) through pipelines, the end d of the heat exchanger (2-1) is connected with an outlet of the second cold and hot water circulating pump (2-2) through pipelines, an inlet of the second cold and hot water circulating pump (2-2) is connected with a b end of the water tank (3) through a pipeline, an outlet of the electromagnetic valve (6) is connected with an a end of the water tank (3) through a pipeline, a c end of the water tank (3) is connected with an a end of the three-way valve (8) through a pipeline, a b end of the three-way valve (8) is connected with an inlet of the first cold and hot water circulating pump (9) through a pipeline, an outlet of the first cold and hot water circulating pump (9) is connected with an inlet of the radiation tail end (5) through a pipeline, an outlet of the radiation tail end (5) is respectively connected with the c end of the three-way valve (8) and the d end of the water tank (3) through pipelines, and an outlet of the fan coil (4) is sequentially connected with the electric two-way valve (; a first temperature sensor (10-1) and a humidity sensor (11) are installed at the air return inlet of the fan coil (4); a water supply pipe and a water return pipe of the radiation tail end (5) are respectively provided with a second temperature sensor (10-2) and a third temperature sensor (10-3); a fourth temperature sensor (10-4) is arranged on a pipeline between the b end of the water tank (3) and the inlet of the second cold and hot water circulating pump (2-2); a differential pressure sensor (12) is arranged between a water supply pipe and a water return pipe of the radiation tail end (5); the control end of the system controller (2-3) is respectively connected with the control end of the outdoor host module (1), the motor of the fan coil (4), the electromagnetic valve (6), the electric two-way valve (7) and the control end of the three-way valve (8) through leads; and the receiving end of the system controller (2-3) is respectively connected with the first temperature sensor (10-1), the second temperature sensor (10-2), the third temperature sensor (10-3), the fourth temperature sensor (10-4), the humidity sensor (11) and the differential pressure sensor (12) through leads.
2. The anti-dewing convection-radiation compound air conditioning system as claimed in claim 1, wherein: the three-way valve (8) is a proportional control valve.
3. The anti-dewing convection-radiation compound air conditioning system as claimed in claim 1, wherein: and the number of rows of heat exchanger tubes of the fan coil (4) is at least 3.
4. The anti-dewing convection-radiation compound air conditioning system as claimed in claim 1, wherein: the electromagnetic valve (6) is a one-way electromagnetic valve.
5. A method of operating the dewing-preventive convection-radiation compound air conditioning system as claimed in claim 1, wherein: according to the operation purpose, the method is divided into the following four working modes:
(1) fast heating mode
When the rapid heating mode is operated, the outdoor host module (1) is in a heating operation state, the electromagnetic valve (6) is in a closed state, and the b ends and the c ends of the first cold and hot water circulating pump (9), the second cold and hot water circulating pump (2-2), the electric two-way valve (7) and the three-way valve (8) are in an open state; hot water enters the fan coil (4) for heating and then enters the d end of the water tank (3) through the electric two-way valve (7); when the temperature value of the second temperature sensor (10-2) received by the system controller (2-3) is lower than a heating set value, the end a of the three-way valve (8) is gradually opened according to a set proportion, and hot water in the water tank (3) sequentially passes through the ends a and b of the three-way valve (8) and the first cold and hot water circulating pump (9) to enter the radiation tail end (5); when the difference value of the measured values of the second temperature sensor (10-2) and the third temperature sensor (10-3) received by the system controller (2-3) is smaller than the set temperature difference value, the end a of the three-way valve (8) is closed, and the circulation is performed in sequence;
(2) heating sleep mode
When the heating sleep mode is operated, the outdoor host module (1) is in a heating operation state, the electric two-way valve (7) is in a closed state, and the b ends and the c ends of the first cold and hot water circulating pump (9), the second cold and hot water circulating pump (2-2), the electromagnetic valve (6) and the three-way valve (8) are in an open state; hot water sequentially enters the end a of the water tank (3) through the electromagnetic valve (6); when the temperature value of the second temperature sensor (10-2) received by the system controller (2-3) is lower than a heating set value, the end a of the three-way valve (8) is gradually opened according to a set proportion, and hot water in the water tank (3) sequentially passes through the ends a and b of the three-way valve (8) and the first cold and hot water circulating pump (9) to enter the radiation tail end (5); when the difference value of the measured values of the second temperature sensor (10-2) and the third temperature sensor (10-3) received by the system controller (2-3) is smaller than the set temperature difference value, the end a of the three-way valve (8) is closed, and the circulation is performed in sequence;
(3) high efficiency refrigeration dehumidification mode
When the high-efficiency refrigeration and dehumidification mode is operated, the outdoor host module (1) is in a refrigeration operation state, the solenoid valve (6), the first cold and hot water circulating pump (9) and the a end of the three-way valve (8) are in a closed state, and the b and c ends of the second cold and hot water circulating pump (2-2), the electric two-way valve (7) and the three-way valve (8) are in an open state; and cold water enters the fan coil (4) for refrigeration, and then enters the d end of the water tank (3) through the electric two-way valve (7). The system controller (2-3) controls the fan coil (4) motor to operate at high frequency;
(4) refrigerated sleep mode
When the outdoor host machine module (1) is in a refrigerating running state, the electromagnetic valve (6) is in a closed state, the b ends and the c ends of the first cold and hot water circulating pump (9), the second cold and hot water circulating pump (2-2), the electric two-way valve (7) and the three-way valve (8) are in an open state, and the fan of the fan coil (4) is in a low-speed running state; cold water enters the fan coil (4) for refrigeration, then enters the d end of the water tank (3) through the electric two-way valve (7), and the system controller (2-3) controls the motor of the fan coil (4) to perform low-frequency operation; when the system controller (2-3) receives that a signal of a humidity sensor (11) at an air return opening of the fan coil (4) is lower than a set value, the first cold and hot water circulating pump (9) operates, cold water is self-circulated in the radiation tail end (5), when the system controller (2-3) receives that a temperature value of the second temperature sensor (10-2) is higher than the set value, an a end of the three-way valve (8) is gradually opened according to a set proportion, and cold water of the water tank (3) sequentially passes through the a end and a b end of the three-way valve (8) and enters the radiation tail end (5) through the first cold and hot water circulating pump (9). And when the difference value of the measured values of the second temperature sensor (10-2) and the third temperature sensor (10-3) received by the system controller (2-3) is less than the set temperature difference value, closing the end a of the three-way valve (8), and circulating in sequence.
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