Ventilation system

Abstract

A ventilation system includes a ventilation device, a heat pump device, and a dehumidification device. The ventilation device has an air supply inlet, an air supply outlet, and an air supply passage defined between the air supply inlet and the air supply outlet. The heat pump apparatus has a refrigerant circuit including a compressor, a first heat exchanger for transferring heat between the refrigerant and a water line, a throttling device, and a second heat exchanger for transferring heat between the refrigerant and outdoor air. The dehumidification device is arranged independent of the ventilation equipment and the heat pump equipment, located on the upstream of the airflow of the ventilation equipment, connected with the ventilation equipment through a ventilation pipeline and connected with the heat pump equipment through a water pipeline. The dehumidification device comprises a shell, a heat exchanger, a temperature and humidity sensor and an electric control valve. By arranging the independent dehumidification device, the dehumidification effect can be achieved without modifying existing ventilation equipment; in addition, the dehumidification device can preheat fresh air introduced into the ventilation equipment.

Description

Technical Field

[0001] The present disclosure relates to a ventilation system, and particularly to a dehumidifying device for a ventilation system. Background Art

[0002] When an existing ventilation device, such as a fresh air unit, needs to introduce a dehumidifying function, a refrigerant circulation device, such as a compressor, an expansion valve, a condenser, an evaporator, etc., is usually required to be provided inside the device. The moisture in the wet air entering the device is removed by condensing the wet air through the refrigerant circulation, so as to achieve the dehumidifying effect. However, such a dehumidifying method will undoubtedly increase the structural complexity inside the device and the overall size of the device. Summary of the Utility Model

[0003] To overcome the problems existing in the related art, the present disclosure provides a ventilation system.

[0004] An embodiment of the present disclosure provides a ventilation system, which includes a ventilation device, a heat pump device, and a dehumidifying device. The ventilation device has an air supply inlet, an air supply outlet, and an air supply passage defined between the air supply inlet and the air supply outlet. The heat pump device has a refrigerant circuit to transfer heat between outdoor air and a water pipeline disposed indoors through the refrigerant. The refrigerant circuit includes a compressor for compressing the refrigerant, a first heat exchanger for transferring heat between the refrigerant and the water pipeline, a throttling device for reducing the pressure of the refrigerant, and a second heat exchanger for transferring heat between the refrigerant and the outdoor air. The dehumidifying device is independently disposed from the ventilation device and the heat pump device and is located upstream of the airflow of the ventilation device. It is connected to the ventilation device through a ventilation pipeline and is connected to the heat pump device through a water pipeline. The dehumidifying device includes a housing, a heat exchanger, a temperature and humidity sensor, and an electric control valve. The housing has an air inlet, an air outlet, and an air flow passage defined between the air inlet and the air outlet; the heat exchanger is disposed inside the housing and on the air flow passage, and it has a heat exchange water pipe; the temperature and humidity sensor is disposed on the above-mentioned air flow passage; the electric control valve is disposed on the heat exchange water pipe to open or close the water flow passage in the heat exchange water pipe.

[0005] In some embodiments, the air outlet of the dehumidifying device is connected to the air supply inlet of the ventilation device, and the heat exchange water pipe of the dehumidifying device is connected to the first heat exchanger of the heat pump device.

[0006] In some embodiments, the temperature and humidity sensor of the dehumidifying device is located between the air inlet of its housing and the heat exchanger.

[0007] In some embodiments, the dehumidifying device further includes a water collecting tray disposed inside the housing and below the heat exchanger, and a drain pipe extending out of the housing is provided on the water collecting tray.

[0008] In some embodiments, the heat pump device further includes a water pump disposed between the first heat exchanger and the water pipeline.

[0009] In some embodiments, the ventilation system further includes a system controller, which is wired or wirelessly connected to the dehumidifying device, the ventilation equipment, and the heat pump device.

[0010] In some embodiments, the ventilation equipment further includes an exhaust inlet, an exhaust outlet, and an exhaust passage defined between the exhaust inlet and the exhaust outlet; the ventilation equipment further includes a heat exchange component disposed at the intersection of the air supply passage and the exhaust passage.

[0011] In some embodiments, the electric control valve of the dehumidifying device is in a normally closed state and is configured to: when the temperature and humidity sensor detects that the humidity of the air flow is greater than or equal to the first humidity threshold, the electric control valve is triggered to open the above-mentioned water flow passage; when the temperature and humidity sensor detects that the temperature of the air flow is less than or equal to the first temperature threshold, the electric control valve is triggered to open the above-mentioned water flow passage.

[0012] In some embodiments, the electric control valve is further configured to: when the temperature and humidity sensor detects that the humidity of the air flow is less than or equal to the second humidity threshold, the electric control valve is triggered to close the above-mentioned water flow passage; wherein the second humidity threshold is less than the first humidity threshold.

[0013] In some embodiments, the electric control valve is further configured to: when the temperature and humidity sensor detects that the temperature of the air flow is greater than or equal to the second temperature threshold, the electric control valve is triggered to close the above-mentioned water flow passage; wherein the second temperature threshold is greater than the first temperature threshold.

[0014] The technical solutions provided by one or more embodiments of the present disclosure may include the following beneficial effects: by providing an independent dehumidifying device, the effect of dehumidification can be achieved without modifying the existing ventilation equipment; in addition, the dehumidifying device can preheat the fresh air introduced into the ventilation equipment, and in some embodiments, it can also prevent the heat exchange component of the ventilation equipment from freezing. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present disclosure. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0016] Figure 1 is a schematic connection diagram between the devices of the ventilation system in an embodiment of the present disclosure;

[0017] Figure 2 isFigure 1 A schematic plan view of the dehumidifying device in the ventilation system shown;

[0018] Figure 3 is Figure 2 A schematic plan view of another perspective of the dehumidifying device shown. Detailed implementation manners

[0019] The following will describe in detail each of the embodiments shown with reference to the accompanying drawings. However, these embodiments do not represent all embodiments consistent with the present disclosure. Structural, method, or functional transformations made by those of ordinary skill in the art based on these implementation manners are all included within the scope of protection claimed in the appended claims.

[0020] As Figure 1 The ventilation system 100 in an embodiment of the present disclosure shown includes a dehumidifying device 10, a ventilation device 20, and a heat pump device 30.

[0021] The ventilation device can be hoisted inside the ceiling, or can be mounted on the indoor wall, or can be made into a cabinet type and directly placed indoors. In some embodiments, the ventilation device 20 can be a total heat exchange ventilation device, which includes a longitudinally extending casing and a plurality of air duct fittings provided at the longitudinal two ends of the casing. The plurality of air duct fittings include an air supply inlet 21 defined at one longitudinal end of the casing for allowing outdoor air to enter, and an exhaust outlet 22 for allowing indoor air to be discharged, and an exhaust inlet 23 defined at the other longitudinal end of the casing for allowing indoor air to enter, and an air supply outlet 24 for allowing outdoor air to be discharged. An air supply passage for sending outdoor air to the indoor is defined between the air supply inlet 21 and the air supply outlet 24, and an exhaust passage for sending indoor air to the outdoor is defined between the exhaust inlet 23 and the exhaust outlet 22. An air supply fan 25 and an exhaust fan 26 are also provided inside the casing. The air supply fan 25 can be provided at any position in the air supply passage, and the exhaust fan 26 can be provided at any position in the exhaust passage. In this embodiment, the air supply fan 25 is provided close to the air supply outlet 24, and the exhaust fan 26 is provided close to the exhaust outlet 22. A heat exchange component 27 is also arranged at the intersection position of the air supply passage and the exhaust passage inside the casing, so that the external air introduced from the outdoor through the air supply passage and the indoor air discharged from the indoor through the exhaust passage perform non-contact heat exchange inside the heat exchange component, so that the external air is heated and then supplied into the indoor, and it will not bring discomfort to users in the cold winter. In some other embodiments, the ventilation device can also be a blower that only has a blowing function, that is, it does not have an exhaust function and does not have a heat exchange component; in these embodiments, the ventilation device also includes an air supply inlet, an air supply outlet, an air supply passage defined between the air supply inlet and the air supply outlet, and an air supply fan.

[0022] The heat pump device 30 can be installed outdoors and can operate in several modes, such as the heating mode, the cooling mode, and the defrosting mode, etc. The heat pump device 30 has a refrigerant circuit, and heat is transferred between outdoor air and indoor air through the operation of the refrigerant in the circuit. The refrigerant circuit generally includes a compressor 31, a first heat exchanger 32, a throttling device 33, and a second heat exchanger 34 installed inside the device casing. The compressor 31 generally uses electricity to compress the refrigerant from a low-pressure gas state to a high-pressure gas state, thereby increasing the temperature, enthalpy, and pressure of the refrigerant. The first heat exchanger 32 can be a plate heat exchanger, which is used to transfer heat between the refrigerant and the water pipelines 61, 62 arranged indoors, and realize the heating and cooling effects indoors through the water pipelines 61, 62. In the heating mode, the first heat exchanger 32 acts as a condenser. The refrigerant leaving the compressor 31 flows through the first heat exchanger 32 and condenses to a saturated liquid state at a substantially constant pressure; during this process, driven by a water pump 36 arranged between the first heat exchanger 32 and the water pipelines 61, 62, the circulating water flowing in the water pipelines 61, 62 flows through the first heat exchanger 32 and absorbs the heat released from the refrigerant and is heated to a higher temperature (such as 43°C). The heated water flows through a heat dissipation device 50, such as a floor heating coil laid under the room floor or a metal radiator installed in the room, through the branches 612, 622 of the water pipelines 61, 62, thereby heating the air in the room to achieve the heating effect. The throttling device 33 can be in the form of an electronic expansion valve, which is used to control the amount of refrigerant entering the second heat exchanger 34. The liquid refrigerant from the first heat exchanger 32 flows through the electronic expansion valve 33, resulting in a decrease in the pressure of the liquid. During this process, the refrigerant partially evaporates, causing the refrigerant to become a mixed liquid state, and reducing its temperature to a value that enables heat exchange to occur in the second heat exchanger 34. The second heat exchanger 34 can be a coil heat exchanger equipped with a blower (not labeled), which acts as an evaporator in the heating mode and uses the heat energy in the air to evaporate the refrigerant from a liquid state to a gaseous state. The gaseous refrigerant discharged from the second heat exchanger 34 is further sucked into the compressor 11 to repeat the above refrigerant cycle. The refrigerant circuit further includes a reversing valve 35, which can be a four-way valve used to reverse the refrigerant cycle, that is, to switch different operating modes by reversing the direction of the refrigerant cycle. In the cooling mode, the first heat exchanger 32 operates as an evaporator, and the second heat exchanger 34 operates as a condenser; at this time, the circulating water flowing in the water pipelines 61, 62 flows through the first heat exchanger 32 and absorbs the heat of the evaporated refrigerant and is cooled to a lower temperature (such as 8°C). The cooling water flows through a fan coil unit 40 usually installed inside the ceiling through the water pipelines 61, 62 to reduce the air temperature in the room, thereby achieving the cooling effect.

[0023] The dehumidifying device 10 is provided independently of the ventilation device 20 and the heat pump device 30, and is connected to the ventilation device 20 through a ventilation pipeline and to the heat pump device 30 through water pipelines 61 and 62. In some embodiments, it is located upstream of the airflow of the ventilation device 20, that is, the air introduced from the outside first passes through the dehumidifying device 10 and then enters the ventilation device 20; at this time, the air outlet 18 of the dehumidifying device 10 is connected to the air supply inlet 21 of the ventilation device 20.

[0024] With reference to Figure 2 and Figure 3 As shown, the dehumidifying device 10 includes a housing 11, a heat exchanger 12, a temperature and humidity sensor 15, and an electric control valve 14. The housing 10 has an air inlet 17 and an air outlet 18, and an air flow path defined between the air inlet 17 and the air outlet 18. The heat exchanger 12 is disposed in the housing 10 and located on the air flow path. In some embodiments, the heat exchanger 12 may be in the form of a finned tube heat exchanger, that is, it has a number of heat exchange fins arranged side by side, and a heat exchange water pipe 121 extends circuitously through these heat exchange fins. In some embodiments, a water collecting tray 13 may be further disposed below the heat exchanger 12, and a drain pipe 131 extending out of the housing 11 is also provided on the water collecting tray 13. The temperature and humidity sensor 15 may be two sensors separately provided for detecting temperature and humidity, or a single sensor in the form of an integrated temperature and humidity probe. The temperature and humidity sensor 15 is disposed on the air flow path. In some embodiments, the temperature and humidity sensor 15 is located between the air inlet 17 and the heat exchanger 12. In some embodiments, the dehumidifying device 10 further includes a filter screen housed in the housing 11 and disposed near the air inlet 17 to filter impurities in the introduced outdoor air. The electric control valve 14 may be a solenoid valve or a valve driven by a stepping motor, and is disposed on the heat exchange water pipe 121 to open or close the water flow path in the heat exchange water pipe. The electric control valve 14 may be disposed on the water inlet section 1211 of the heat exchange water pipe or on the water outlet section 1212 of the heat exchange water pipe. The electric control valve 14 is usually in a closed state to disconnect the water flow path in the heat exchange water pipe. When the electric control valve 14 is opened, the water in the heat exchange water pipe 121 flows into the water pipeline through the branches 611 and 621 of the water pipelines 61 and 62, and then realizes liquid connection with the first heat exchanger 32 of the heat pump device 30.

[0025] In some embodiments, the ventilation system 100 further includes a system controller 60, which is wired or wirelessly connected to the dehumidifying device 10, the ventilation device 20, and the heat pump device 30 to control these devices and equipment. Taking the dehumidifying device 10 as an example, the system controller 60 can communicate with the temperature and humidity sensor 15 and the electric control valve 14 of the dehumidifying device 10, and correspondingly control the electric control valve 14 according to the data monitored by the temperature and humidity sensor 15. In some other embodiments, a separate device controller can also be provided inside the housing of the dehumidifying device 10, that is, without relying on the system controller, and the device controller can independently control the electric control valve 14 correspondingly according to the data monitored by the temperature and humidity sensor 15. The system controller can be a control circuit composed of a processor, a memory, and several electronic components connected in a certain wiring manner. The processor can be a central processing unit (CPU), or other general-purpose processors, digital signal processors (DSPs), application specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. The general-purpose processor can be a microprocessor or any conventional processor.

[0026] When the ventilation system 100 operates in summer, the humidity in the air is usually relatively high (for example, the ambient temperature is 30°C and the relative humidity is 80%). At this time, the heat pump device 30 operates in the cooling mode, that is, the water in the water pipes 61 and 62 is cold water with a lower temperature. When the temperature and humidity sensor 15 detects that the humidity of the incoming air flow is greater than or equal to the first humidity threshold (such as 70% relative humidity), the electric control valve 14 is triggered to open the water flow passage between the heat exchange water pipe 121 and the water pipes 61 and 62, so that the cold water flows through the heat exchanger 12; at the same time, the air flow passing through the heat exchanger 12 is cooled below the dew point temperature (for example, the dew point temperature of air with an ambient temperature of 30°C and a relative humidity of 80% is 27°C), and then the moisture in the air is condensed and precipitated, and is collected and discharged through the water collecting tray 13, so as to achieve the effect of dehumidification. As the air humidity decreases, when the temperature and humidity sensor 15 detects that the air flow humidity is less than or equal to the second humidity threshold (such as 50% relative humidity), the electric control valve 14 is triggered to close the above-mentioned water flow passage, so that the cold water flow is cut off and the dehumidification stops. The second humidity threshold is less than the first humidity threshold.

[0027] When the ventilation system 100 operates in winter, the heat pump device 30 operates in the heating mode, that is, the hot water in the water pipes 61 and 62 has a relatively high temperature. When the temperature and humidity sensor 15 detects that the temperature of the incoming air flow is less than or equal to the first temperature threshold, the electric control valve 14 is triggered to open the water flow passage between the heat exchange water pipe 121 and the water pipes 61 and 62, so that the hot water flows through the heat exchanger 12. The first temperature threshold is usually below 0°C, such as in the range of 0 to -7°C, and can be -3°C, -5°C, -7°C, etc. At the same time, the air flow passing through the heat exchanger 12 is heated to preheat the air entering the ventilation device 20. As the air temperature rises, when the temperature and humidity sensor 15 detects that the air flow temperature is greater than or equal to the second temperature threshold, the electric control valve 14 is triggered to close the above-mentioned water flow passage, so that the hot water flow is cut off and the air preheating stops. The second temperature threshold is greater than the first temperature threshold. The second temperature threshold is usually above 0°C, such as in the range of 0 to 7°C, and can be 3°C, 5°C, 7°C, etc. In some embodiments, the ventilation device is a total heat exchange ventilation device, that is, it includes a heat exchange component. When the temperature of the introduced air is lower than 0°C, due to the too large temperature difference between the introduced fresh air and the exhaust air from the indoor to the outdoor, frost forms on the side of the heat exchange component facing the fresh air, resulting in a decline in the performance of the heat exchange component. By preheating the air entering the ventilation device in advance, frosting of the heat exchange component can be avoided to achieve the anti-freezing effect.

[0028] By setting up an independent dehumidification device, the effect of dehumidification can be achieved without modifying the existing ventilation device; in addition, this dehumidification device can preheat the fresh air introduced into the ventilation device, and in some embodiments in particular, it can also play an anti-freezing role for the heat exchange component of the ventilation device.

[0029] In the description of the above embodiments in the present disclosure, the orientation or positional relationship indicated by "longitudinal", "transverse", "vertical", "radial", "circumferential", "horizontal", "length", "width", "thickness", "upper", "lower", "left", "right", "front", "rear", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of description and simplification of the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present disclosure.

[0030] In the above disclosure, the terms "first", "second", etc. are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined by "first", "second", etc. may explicitly or implicitly include at least one such feature. In the above description, the meanings of similar terms such as "several", "multiple", etc. are at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0031] In the above disclosure, unless otherwise clearly defined and limited, terms such as "installation", "adjacent", "connected", "joined", "fixed", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be directly connected or indirectly connected through an intermediate medium, and it can be the internal communication of two components or the interaction relationship between two components, unless otherwise clearly defined. For those of ordinary skill in the art, the specific meanings of the above terms in this disclosure can be understood according to specific circumstances.

[0032] In the above disclosure, unless otherwise clearly defined and limited, the first feature being "on" or "under" the second feature can be that the first feature is in direct contact with the second feature, or the first and second features are in indirect contact through an intermediate medium. Also, the first feature being "above", "over", "on top of" the second feature can be that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature has a higher horizontal height than the second feature. The first feature being "under", "beneath", "underneath" the second feature can be that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature has a lower horizontal height than the second feature.

[0033] The device embodiments described above are merely illustrative. For example, the division of units in a controller is only a division of logical functions, and there can be other division methods in actual implementation. For example, multiple units can be combined or integrated into another system, or some features can be ignored or not executed. In addition, the connections between the components, components, and units discussed above can be electrical, mechanical, or other connection forms; they can be directly connected or indirectly connected through some interfaces, etc.; they can be wired connections or wireless communications.

[0034] In addition, the units described as separate components above may or may not be physically separated, and the components shown as units may or may not be physical units; some or all of the units can be selected according to actual needs to achieve the purpose of the disclosed embodiment solution. In addition, the functional units in the above various embodiments can be integrated in a processing unit, or each unit can exist physically alone, or two or more units can be integrated in one unit. The above integrated units can be implemented in the form of hardware or in the form of hardware plus software functional units.

[0035] It should be understood that although this specification is described according to embodiments, not every embodiment only contains an independent technical solution. This narrative way of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A ventilation system, characterized in that: The ventilation system includes ventilation equipment having an air supply inlet, an air supply outlet, and an air supply passage defined between the air supply inlet and the air supply outlet; a heat pump device having a refrigerant circuit for transferring heat between outdoor air and a water pipeline disposed indoors through the refrigerant; the refrigerant circuit includes a compressor for compressing the refrigerant, a first heat exchanger for transferring heat between the refrigerant and the water pipeline, a throttling device for reducing the pressure of the refrigerant, and a second heat exchanger for transferring heat between the refrigerant and outdoor air; a dehumidifying device independently disposed from the ventilation equipment and the heat pump device and located upstream of the air flow of the ventilation equipment, which is connected to the ventilation equipment through a ventilation pipeline and connected to the heat pump device through the water pipeline; the dehumidifying device includes a housing, a heat exchanger, a temperature and humidity sensor, and an electric control valve; the housing has an air inlet and an air outlet, and an air flow passage defined between the air inlet and the air outlet; the heat exchanger is disposed in the housing and located on the air flow passage, and it has a heat exchange water pipe; the temperature and humidity sensor is disposed on the air flow passage; the electric control valve is disposed on the heat exchange water pipe to open or close the water flow passage in the heat exchange water pipe.

2. The ventilation system according to claim 1, characterized in that: The air outlet of the dehumidifying device is connected to the air supply inlet of the ventilation equipment, and the heat exchange water pipe of the dehumidifying device is connected to the first heat exchanger of the heat pump device.

3. The ventilation system according to claim 1, characterized in that: The temperature and humidity sensor of the dehumidifying device is located between the air inlet of its housing and the heat exchanger.

4. The ventilation system according to claim 1, wherein: The dehumidifying device further includes a water collecting tray disposed in the housing and below the heat exchanger, and a drain pipe extending out of the housing is provided on the water collecting tray.

5. The ventilation system according to claim 1, wherein: The heat pump device further includes a water pump disposed between the first heat exchanger and the water pipeline.

6. The ventilation system according to claim 1, characterized in that: The ventilation system further includes a system controller, and the system controller is connected to the dehumidifying device, the ventilation equipment, and the heat pump device in a wired or wireless manner.

7. The ventilation system according to claim 1, wherein: The ventilation equipment further includes an exhaust inlet, an exhaust outlet, and an exhaust passage defined between the exhaust inlet and the exhaust outlet; the ventilation equipment further includes a heat exchange component disposed at the intersection of the air supply passage and the exhaust passage.

8. The ventilation system according to claim 1 or 2, characterized in that: The electric control valve of the dehumidifying device is in a normally closed state and is configured to: when the temperature and humidity sensor detects that the air flow humidity is greater than or equal to a first humidity threshold, the electric control valve is triggered to open the water flow passage; when the temperature and humidity sensor detects that the air flow temperature is less than or equal to a first temperature threshold, the electric control valve is triggered to open the water flow passage.

9. The ventilation system according to claim 8, characterized in that: The electric control valve is further configured to: when the temperature and humidity sensor detects that the air flow humidity is less than or equal to a second humidity threshold, the electric control valve is triggered to close the water flow passage; wherein the second humidity threshold is less than the first humidity threshold.

10. The ventilation system according to claim 8, wherein: The electric control valve is further configured to: when the temperature and humidity sensor detects that the air flow temperature is greater than or equal to a second temperature threshold, the electric control valve is triggered to close the water flow passage; wherein the second temperature threshold is greater than the first temperature threshold.

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