Air conditioning system

Abstract

The utility model relates to an air conditioning system. The air conditioning system comprises a fresh air pretreatment unit, an air conditioning unit and an air conditioning unit, the fresh air pretreatment unit is used for pretreating temperature and humidity of fresh air so as to obtain pretreated fresh air; the constant-temperature and constant-humidity unit is connected with the fresh air pretreatment unit in series, the pretreated fresh air and primary return air are mixed to form primary mixed air, the primary mixed air is dehumidified, then the dehumidified primary mixed air and secondary return air are mixed to form secondary mixed air, and the primary mixed air and the secondary mixed air are mixed to form secondary mixed air. And the temperature and the humidity of the secondary mixed air are finely adjusted. By means of the air conditioning system, fresh air dehumidification energy consumption can be reduced, and the energy efficiency of the air conditioning system is improved.

Description

Technical Field

[0001] The present application relates to an air conditioning system, and more particularly to a constant temperature and humidity air conditioning system for performing air conditioning in a place requiring strict control of temperature and humidity in the environment. Background Art

[0002] In places such as archives and precious material collection halls, there are strict requirements for the temperature and humidity of the indoor environment. In order to properly protect historical materials, precious cultural relics and video materials, it is necessary to distinguish categories according to their characteristics and formulate the best storage temperature and humidity. In the case of constant temperature and humidity air conditioning treatment in such places, usually, the fresh air volume only accounts for 15-20% of the total air volume, but the wet load of the fresh air is as high as 70-80%. The conventional combined air conditioning unit consumes huge energy for operation, which is not conducive to meeting environmental protection requirements such as energy saving and carbon reduction. In addition, the air supply temperature of general direct expansion air conditioning units is relatively high (for example, 16°C), and it is difficult to achieve low-temperature and low-humidity air supply as low as 6°C, for example. Utility Model Content

[0003] This application is made in view of the technical problems existing in the above-mentioned prior art. One purpose of this application is to provide an air conditioning system that can effectively reduce the energy consumption of fresh air dehumidification and improve energy efficiency; and a further purpose of this application is to provide an air conditioning system that can achieve low-temperature and low-humidity air supply and accurately control the temperature and humidity of the air supply; further, a further purpose of this application is to provide an air conditioning system that can ensure the continuous and uninterrupted operation of the unit.

[0004] According to one solution of the present application, an air conditioning system is provided. The air conditioning system comprises: a fresh air pre-processing unit, the fresh air pre-processing unit pre-processes the fresh air in temperature and humidity to obtain pre-processed fresh air; and a constant temperature and humidity unit, the constant temperature and humidity unit is connected in series with the fresh air pre-processing unit, mixes the pre-processed fresh air with the primary return air to form a primary mixed air, dehumidifies the primary mixed air, further mixes the dehumidified primary mixed air with the secondary return air to form a secondary mixed air, and finely adjusts the temperature and humidity of the secondary mixed air.

[0005] According to the above-mentioned air conditioning system of the present application, it can also be: the fresh air pretreatment unit includes an air intake section, a pretreatment filtration section, a pretreatment hot and cold dual-purpose section, a pretreatment evaporation section, and a pretreatment air supply section.

[0006] According to the above-mentioned air-conditioning system of the present application, it can also be: in the pretreatment dual-purpose cooling and heating section, a pretreatment dual-purpose cooling and heating coil and / or a surface cooler are arranged, and in the pretreatment evaporation section, a first evaporator and / or a second evaporator are arranged.

[0007] According to the above-mentioned air-conditioning system of the present application, it can also be: the constant temperature and humidity unit includes a primary air mixing section, a rotary dehumidification section, a secondary air mixing section, a filtration section, a hot and cold dual-purpose section, an evaporation section, an electric heating section, a humidification section, and an air supply section.

[0008] According to the above-mentioned air-conditioning system of the present application, it can also be that: a dual-purpose coil is provided in the dual-purpose cold and hot section, and a third evaporator and / or a fourth evaporator is provided in the evaporation section.

[0009] According to the above-mentioned air-conditioning system of the present application, it can also be: the constant temperature and humidity unit also includes a primary return air duct and a secondary return air duct, the primary return air duct is connected to the primary mixing air section, and the secondary return air duct is connected to the secondary mixing air section, and the rotary dehumidification section is arranged between the primary mixing air section and the secondary mixing air section.

[0010] According to the above-mentioned air-conditioning system of the present application, a primary return air valve is provided at the position where the primary return air duct is connected to the primary air mixing section, and a secondary return air valve is provided at the position where the secondary return air duct is connected to the secondary air mixing section.

[0011] According to the above-mentioned air conditioning system of the present application, it can also be that: an air volume box is further arranged between the fresh air pretreatment unit and the constant temperature and humidity unit.

[0012] According to the above-mentioned air-conditioning system of the present application, it can also be that: the air-conditioning system includes a plurality of constant temperature and humidity units arranged in parallel.

[0013] According to the above-mentioned air-conditioning system of the present application, it can also be: the air-conditioning system includes a plurality of groups of fresh air pre-treatment units arranged in parallel and a plurality of groups of constant temperature and humidity units arranged in parallel.

[0014] Effect of utility model

[0015] According to the air conditioning system of the present application, by providing a fresh air pretreatment unit, the fresh air can be pretreated to a predetermined temperature and humidity, thereby significantly reducing the load in the rear constant temperature and humidity unit, such as due to the rotary dehumidification, and effectively reducing energy consumption; in addition, by applying two return air, the temperature and humidity of the fresh air can be effectively adjusted with lower energy consumption; these two aspects combined can effectively reduce the heat and humidity load of the constant temperature and humidity unit. Reduce the energy consumption of fresh air dehumidification and improve the energy efficiency of the air conditioning system. Therefore, it is possible to reduce the energy consumption of fresh air dehumidification and improve the energy efficiency of the air conditioning system.

[0016] In addition, by including an air intake section, a pretreatment filtration section, a pretreatment dual-purpose cooling and heating section, a pretreatment evaporation section, and a pretreatment air supply section in the fresh air pretreatment unit, the pretreatment dual-purpose cooling and heating section and the pretreatment evaporation section can be used as backup devices for each other, so that when the cooling or heating capacity of one of the pretreatment dual-purpose cooling and heating section and the pretreatment evaporation section decreases or fails, the other can be used alone or as an auxiliary to provide cooling or heating, thereby achieving continuous and uninterrupted operation of the unit.

[0017] In addition, by providing a pretreatment cold and hot dual-purpose coil and / or a surface cooler in the pretreatment cold and hot dual-purpose section, and providing a first evaporator and / or a second evaporator in the pretreatment evaporation section, when the pretreatment cold and hot dual-purpose coil and the surface cooler are provided at the same time, in the cooling mode, the cold and hot dual-purpose coil and the surface cooler can be used as backup equipment for each other, so that when the cooling capacity of one of them decreases or fails, the other can be used alone or auxiliary for cooling, and in addition, the pretreatment cold and hot dual-purpose coil and the surface cooler can be used to more finely adjust the cooling air outlet and the heating air outlet; and in the heating mode, the pretreatment cold and hot dual-purpose coil, the first evaporator and the second evaporator can be used as backup equipment for each other, so that when the heating capacity of one of them decreases or fails, the other or both can be used for heating, thereby achieving continuous and uninterrupted operation of the unit. In addition, in the case of two evaporators, when it is difficult to reduce the air temperature to the target temperature using only one evaporator, the two evaporators can be made to work simultaneously, thereby obtaining a larger temperature reduction range.

[0018] In addition, by including a primary air mixing section, a rotary dehumidification section, a secondary air mixing section, a filtration section, a dual-purpose section, an evaporation section, an electric heating section, a humidification section, and an air supply section in the constant temperature and humidity unit, the dual-purpose section and the evaporation section can be used as backup devices for each other, so that when the cooling or heating capacity of one of the dual-purpose section and the evaporation section decreases or fails, the other can be used alone or as an auxiliary to provide cooling or heating, thereby achieving continuous and uninterrupted operation of the unit.

[0019] In addition, by providing a dual-purpose hot and cold coil in the dual-purpose hot and cold section, and providing a third evaporator and / or a fourth evaporator in the evaporation section, in the cooling mode, when the third evaporator and the fourth evaporator are provided at the same time, the third evaporator and the fourth evaporator can be used as backup devices for each other, so that when the cooling capacity of one of them decreases or fails, the other can be used alone or as an auxiliary for cooling; and, in the heating mode, the dual-purpose hot and cold coil, the third evaporator and / or the fourth evaporator can be used as backup devices for each other, so that when the heating capacity of one of them decreases or fails, the other or both can be used for heating, thereby achieving continuous and uninterrupted operation of the unit.

[0020] In addition, the constant temperature and humidity unit includes a primary return air duct and a secondary return air duct, the primary return air duct is connected to the primary mixed air section, the secondary return air duct is connected to the secondary mixed air section, and the rotary dehumidification section is arranged between the primary mixed air section and the secondary mixed air section. By adjusting the primary return air volume of the primary return air duct, the secondary return air volume of the secondary return air duct, and the electric heating gear of the rotary dehumidification section, the absolute moisture content after evaporation after the fourth evaporator can be controlled within the specified moisture content range, thereby realizing low-temperature and low-humidity air supply and precise control of the temperature and humidity of the supply air.

[0021] In addition, by providing a primary return air valve at the position where the primary return air duct is connected to the primary air mixing section, and providing a secondary return air valve at the position where the secondary return air duct is connected to the secondary air mixing section, the primary return air volume of the primary return air duct and the secondary return air volume of the secondary return air duct can be easily adjusted using the primary return air valve and the secondary return air valve, thereby easily controlling the absolute moisture content after evaporation within a specified moisture content range, thereby further improving the control accuracy of the temperature and humidity of the supply air.

[0022] In addition, by providing an air volume box between the fresh air pre-processing unit and the constant temperature and humidity unit, the air volume sent from the fresh air pre-processing unit to the constant temperature and humidity unit can be easily adjusted using the air volume box.

[0023] In addition, by including multiple groups of constant temperature and humidity units arranged in parallel, the air-conditioning system can realize mutual backup or simultaneous use between the multiple groups of constant temperature and humidity units, thereby easily realizing long-term continuous and uninterrupted air-conditioning treatment and improving the flexibility of controlling the temperature and humidity of the supply air.

[0024] In addition, similarly, by having the air-conditioning system include multiple groups of fresh air pre-treatment units arranged in parallel and multiple groups of constant temperature and humidity units arranged in parallel, it is possible to more flexibly realize mutual backup or simultaneous use of the multiple groups of constant temperature and humidity units, thereby realizing long-term continuous and uninterrupted air-conditioning treatment and improving the flexibility of controlling the temperature and humidity of the supply air. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of a fresh air pretreatment unit of an air conditioning system according to the present application.

[0026] Figure 2 It is a schematic diagram of a constant temperature and humidity unit of an air conditioning system according to the present application.

[0027] Figure 3 (a) is a working timing diagram of the fresh air pretreatment unit of the air-conditioning system according to the present application in the heating mode, and (b) is a working timing diagram of the fresh air pretreatment unit of the air-conditioning system according to the present application in the cooling mode.

[0028] Figure 4 (a) is a working timing diagram of the constant temperature and humidity unit of the air-conditioning system according to the present application in the heating mode, and (b) is a working timing diagram of the constant temperature and humidity unit of the air-conditioning system according to the present application in the cooling mode.

[0029] Figure 5 This is a block diagram showing an example of the air conditioning system of the present application.

[0030] Figure 6 This is a block diagram showing another example of the air conditioning system of the present application.

[0031] Figure 7 This is a block diagram showing another example of the air conditioning system of the present application.

[0032] Description of reference numerals:

[0033] 1Fresh air valve

[0034] 2 Air inlet section

[0035] 3 Pretreatment combined filtration section

[0036] 4 Pretreatment chemical filtration section

[0037] 5 Pretreatment hot and cold dual-purpose section

[0038] 5a Pretreatment Hot and Cold Dual-Purpose Coil

[0039] 5b Surface Cooler

[0040] 6First external unit

[0041] 7 Second external unit

[0042] 8 Pretreatment evaporation section

[0043] 8a The first evaporator

[0044] 8b Second evaporator

[0045] 9Pre-treatment air supply section

[0046] 10Pre-treatment air supply valve

[0047] 11 Pre-treatment fresh air valve

[0048] 12 Primary air mixing section

[0049] 13 Rotary dehumidification section

[0050] 14 Secondary air mixing section

[0051] 15 combined filter segments

[0052] 16 Chemical filtration section

[0053] 17 hot and cold sections

[0054] 17a hot and cold dual-purpose coil

[0055] 18 Middle section

[0056] 19Third external unit

[0057] 20 Fourth external unit

[0058] 21 Evaporation section

[0059] 21a The third evaporator

[0060] 21b Fourth evaporator

[0061] 22 Electric heating section

[0062] 23 humidification section

[0063] 24 air supply sections

[0064] 25 air supply valve

[0065] 26 return air duct

[0066] 26a primary return air duct

[0067] 26b Secondary return air duct

[0068] 27 Primary return air valve

[0069] 28 Secondary return air valve

[0070] 100, 100a, 100b fresh air pretreatment unit

[0071] 200 air volume box

[0072] 300, 300a, 300b, 300c constant temperature and humidity units

[0073] 400 Indoor DETAILED DESCRIPTION

[0074] The present disclosure is described in detail below. In the following paragraphs, different aspects of the embodiments are defined in more detail. Each aspect so defined can be combined with any other aspect or aspects, unless explicitly stated not to be combined. In particular, any feature that is considered to be preferred or advantageous can be combined with one or more other features that are considered to be preferred or advantageous.

[0075] The terms "first", "second", etc. that appear in the present disclosure are only for the convenience of description to distinguish different components with the same name, and do not indicate a sequence or a primary and secondary relationship.

[0076] Furthermore, when a component is referred to as being “on” another component, the component may be directly on the other component, or may be indirectly on the other component with one or more intermediate components interposed therebetween. Additionally, when a component is referred to as being “connected to” another component, the component may be directly connected to the other component, or may be indirectly connected to the other component with one or more intermediate components interposed therebetween. Hereinafter, the same reference numerals denote the same components.

[0077] The descriptions of directions or positional relationships indicated by “upper”, “lower”, “top”, “bottom”, “front”, “back”, “inside” and “outside” in the present disclosure are only for the convenience of describing the present disclosure, and do not indicate or imply that the device referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as limiting the scope of protection of the present application.

[0078] Hereinafter, embodiments of the present application will be described in detail with reference to the accompanying drawings.

[0079] The air conditioning unit according to the present application mainly includes a fresh air pre-treatment unit and a constant temperature and humidity unit. Figure 1 , the fresh air pre-treatment unit 100 of the air-conditioning system of the present application is described.

[0080] like Figure 1 As shown, in the fresh air pretreatment unit 100, an air intake section 2, a pretreatment combined filter section 3, a pretreatment chemical filter section 4, a pretreatment cold and hot dual-purpose section 5, a pretreatment evaporation section 8 and a pretreatment air supply section 9 are arranged along the direction of air flow. Here, it should be noted that the "cold and hot dual-purpose section" mentioned in the present application refers to the part of the unit that has both cooling and heating functions, and the "pretreatment cold and hot dual-purpose section" refers to the part of the fresh air pretreatment unit that is used to pretreat the fresh air and has both cooling and heating functions. In addition, a fresh air valve 1 is arranged at the entrance of the fresh air pretreatment unit 100 (i.e., the entrance of the air intake section 2), and a pretreatment air supply valve 10 is arranged at the outlet of the fresh air pretreatment unit 100 (i.e., the outlet of the pretreatment air supply section 9).

[0081] The fresh air valve 1 is provided at the entrance of the fresh air pretreatment unit 100, and is used to adjust the amount of fresh air entering the fresh air pretreatment unit 100. The fresh air flowing in from the entrance provided with the fresh air valve 1 enters the interior of the fresh air pretreatment unit 100 through the air inlet section 2. The pretreatment combined filter section 3 and the pretreatment chemical filter section 4 are used to filter the fresh air flowing into the fresh air pretreatment unit 100, so as to remove particulate matter, dust, corrosive gas or other harmful gas components contained in the fresh air.

[0082] In the pre-treatment hot and cold dual-purpose section 5, for example, a pre-treatment hot and cold dual-purpose coil 5a and / or a surface cooler 5b are provided. In the case where both the pre-treatment hot and cold dual-purpose coil 5a and the surface cooler 5b are provided, the pre-treatment hot and cold dual-purpose coil 5a and the surface cooler 5b can be used as backup devices for each other. As an example, for example, the pre-treatment hot and cold dual-purpose section 5 can be set to use the surface cooler 5b as the main cooling device when the air-conditioning unit is operated in the cooling mode. When the surface of the surface cooler 5b is covered with dust and the cooling capacity is reduced due to, for example, long-term use, the hot and cold dual-purpose coil 5a is activated at the same time to meet the cooling demand. Of course, the present application is not limited to this. For example, it can also be set to turn off the surface cooler 5b when the cooling capacity of the surface cooler 5b decreases, and only use the dual-purpose cold and hot coil 5a to meet the cooling demand; or, the dual-purpose cold and hot coil 5a can be used as the main cooling device, and when the cooling capacity of the dual-purpose cold and hot coil 5a decreases, the surface cooler 5b is activated to meet the cooling demand. In addition, in the pre-treatment cold and hot section, it is not necessary to set the pre-treatment cold and hot coil and the surface cooler at the same time, but only the pre-treatment cold and hot coil 5a or the surface cooler 5b can be set. In addition, two or more surface coolers can be set, or two or more cold and hot coils can be set, as long as the requirements of constant temperature and humidity treatment can be met. Of course, from the perspective of more finely adjusting the cooling air outlet and the heating air outlet, the pre-treatment cooling dual-purpose coil and the surface cooler can be set at the same time to obtain the ideal effect.

[0083] In the pre-treatment evaporation section 8, a first evaporator 8a and / or a second evaporator 8b are provided. In addition, outside the place where the air conditioning system performs air conditioning, a first external machine 6 and / or a second external machine 7 are provided for respectively making the first evaporator 8a and / or the second evaporator 8b perform cooling operation. For the first external machine 6 and the second external machine 7, for example, any known type of external machine such as a multi-split unit or a rooftop unit can be used. By providing the first evaporator 8a and the second evaporator 8b in the pre-treatment evaporation section 8, the first evaporator 8a and the second evaporator 8b can be used as backup devices for each other. As an example, for example, the pre-treatment evaporation section 8 can be arranged so that when the air conditioning unit is operated in the cooling mode, when one of the first evaporator 8a and the second evaporator 8b has dust on the surface of the evaporator due to the use time process and the refrigeration capacity decreases, the two evaporators are activated at the same time to meet the cooling demand. Of course, the present application is not limited to this. For example, it can also be configured that when the refrigeration capacity of one of the first evaporator 8a and the second evaporator 8b decreases, only the other evaporator is used to meet the cooling demand. In addition, the present application is not limited to the first evaporator and the second evaporator being provided at the same time. As long as the requirements of constant temperature and humidity treatment can be met, only one evaporator can be provided, or more than two evaporators can be provided.

[0084] In addition, by providing a pretreatment cold and hot dual-purpose coil 5a in the pretreatment cold and hot dual-purpose section 5, and providing a first evaporator 8a and a second evaporator 8b in the pretreatment evaporation section 8, when the air-conditioning unit is operated in the heating mode, the pretreatment cold and hot dual-purpose coil 5a, the first evaporator 8a and the second evaporator 8b can be used as backup devices for each other. For example, it can be configured to use the pretreatment cold and hot dual-purpose coil 5a as the main heating device, and when, for example, the pretreatment cold and hot dual-purpose coil 5a fails or the hot water supply cannot meet the heating demand, the heat pump function of the first evaporator 8a and the second evaporator 8b is used to meet the heating demand. Of course, the present application is not limited to this. For example, on the contrary, it can also be configured to use the first evaporator 8a and the second evaporator 8b as the main heating device, and when the first evaporator 8a and the second evaporator 8b fail, etc., the pretreatment cold and hot dual-purpose coil 5a is used to meet the heating demand.

[0085] In the pre-treatment air supply section 9, for example, a pre-treatment air supply fan or the like may be provided so as to deliver the pre-treated fresh air formed after being processed by the pre-treatment combined filtration section 3, the pre-treatment chemical filtration section 4, the pre-treatment hot and cold dual-purpose section 5 and the pre-treatment evaporation section 8 out of the fresh air pre-treatment unit 100. In addition, at the outlet of the pre-treatment air supply section 9, for example, a pre-treatment air supply valve may be provided so as to be able to adjust the air volume of the pre-treated fresh air delivered from the fresh air pre-treatment unit 100.

[0086] Secondly, refer to Figure 2 , the constant temperature and humidity unit 300 of the air-conditioning system of the present application is described.

[0087] like Figure 2 As shown, in the constant temperature and humidity unit 300, a primary air mixing section 12, a rotary dehumidification section 13, a secondary air mixing section 14, a combined filtering section 15, a chemical filtering section 16, a cold and hot dual-purpose section 17, an intermediate section 18, an evaporation section 21, an electric heating section 22, a humidification section 23 and an air supply section 24 are arranged along the direction of air flow. In addition, a pre-treatment fresh air valve 11 is arranged at the inlet of the constant temperature and humidity unit 200 (i.e., the inlet of the primary air mixing section 12), and an air supply valve 25 is arranged at the outlet of the constant temperature and humidity unit 200 (i.e., the outlet of the air supply section 24).

[0088] In addition, in the constant temperature and humidity unit 200, a return air duct 26 is also provided in parallel with the air flow path formed by the air mixing section 12, the rotary dehumidification section 13, the secondary air mixing section 14, the combined filtering section 15, the chemical filtering section 16, the cold and hot dual-purpose section 17, the intermediate section 18, the evaporation section 21, the electric heating section 22, the humidification section 23 and the air supply section 24. A primary return air duct 26a and a secondary return air duct 26b are branched from the return air duct 26. The primary return air duct 26a is connected to the primary air mixing section 12, and a primary return air valve 27 is provided at the position where the primary return air duct 26a is connected to the primary air mixing section 12. The secondary return air duct 26b is connected to the secondary air mixing section 14, and a secondary return air valve 28 is provided at the position where the secondary return air duct 26b is connected to the secondary air mixing section 14.

[0089] The pre-treated fresh air valve 11 is used to adjust the air volume of the pre-treated fresh air entering the primary air mixing section 12 of the constant temperature and humidity unit 300. The primary return air valve 27 is used to adjust the air volume of the primary return air entering the primary air mixing section 12 from the primary return air duct 26a. The pre-treated fresh air and the primary return air entering the primary air mixing section 12 are mixed with each other to form the primary mixed air, and then flow into the rotary dehumidification section 13. A rotary dehumidifier is provided in the rotary dehumidification section 13, and the rotary dehumidifier is used to perform rotary dehumidification on the primary mixed air flowing therein. Afterwards, the primary mixed air dehumidified in the rotary dehumidification section 13 flows into the secondary mixed air section 14, and is mixed with the secondary return air entering the secondary mixed air section 14 from the secondary return air duct 26b via the secondary return air valve 28 to form the secondary mixed air.

[0090] However, the secondary mixed air formed in the secondary mixed air section 14 flows through the combined filter section 15 and the chemical filter section 16, and is further filtered by the combined filter section 15 and the chemical filter section 16, and removes the particulate matter, dust, corrosive gases or other harmful gas components remaining in the pretreated fresh air and newly brought in by the primary return air and the secondary return air.

[0091] In the dual-purpose cold and hot section 17, a dual-purpose cold and hot coil 17a is provided. In the evaporation section 21, a third evaporator 21a and / or a fourth evaporator 21b are provided. In addition, similarly to the fresh air pre-treatment unit 100, a third external unit 19 and / or a fourth external unit 20 for respectively making the third evaporator 21a and / or the fourth evaporator 8b perform cooling operation are provided outdoors of the place where the air conditioning system performs air conditioning. Moreover, for the third external unit 19 and the fourth external unit 20, for example, any known type of external unit such as a multi-split unit or a rooftop unit can also be used. In addition, for example, between the dual-purpose cold and hot section 17 and the evaporation section 21, an intermediate section 18 can also be provided for facilitating the installation, inspection or maintenance of the unit by the staff.

[0092] By providing a hot and cold dual-purpose coil 17a in the hot and cold dual-purpose section 17, and providing a third evaporator 21a and a fourth evaporator 21b in the evaporation section 21, when the air conditioning unit is operated in the cooling mode, the third evaporator 21a and the fourth evaporator 21b can be used as backup devices for each other. For example, it can be configured so that when one of the third evaporator 21a and the fourth evaporator 21b fails, the other is activated to meet the cooling demand; or when the evaporator surface is covered with dust due to the use time process and the cooling capacity is reduced, the two evaporators are activated at the same time to meet the cooling demand. In addition, when the air conditioning unit is operated in the heating mode, the hot and cold dual-purpose coil 17a, the third evaporator 21a and the fourth evaporator 21b can be used as backup devices for each other. For example, the hot and cold dual-purpose coil 17a can be configured as the main heating device. When the hot and cold dual-purpose coil 17a fails or the hot water supply cannot meet the heating demand, the heat pump function of the third evaporator 21a and the fourth evaporator 21b is used to meet the heating demand. Of course, the present application is not limited to this. For example, the third evaporator 21a and the fourth evaporator 21b can be configured as the main heating device. When the third evaporator 21a and the fourth evaporator 21b fail or dust accumulates on the surface, the hot and cold dual-purpose coil 17a is used to meet the heating demand. Of course, the present application is not limited to the third evaporator and the fourth evaporator being provided at the same time. As long as the requirements of constant temperature and humidity treatment can be met, there is no problem even if only one evaporator is provided, or more than two evaporators are provided.

[0093] The constant temperature and humidity unit 300 is further equipped with an electric heating section 22 and a humidifying section 23 after the evaporating section 21 , so that the temperature and humidity of the air can be adjusted more accurately by using the electric heating section 22 and the humidifying section 23 .

[0094] In the air supply section 24, for example, an air blower may be provided so as to supply the air that has been treated with constant temperature and humidity by the primary air mixing section 12, the rotary dehumidification section 13, the secondary air mixing section 14, the combined filtration section 15, the chemical filtration section 16, the hot and cold dual-purpose section 17, the intermediate section 18, the evaporation section 21, the electric heating section 22, and the humidification section 23 to indoor spaces where a constant temperature and humidity environment is to be maintained.

[0095] Usually, in places such as archives and precious materials collection halls, a constant temperature and humidity environment with low temperature and low humidity needs to be maintained all year round. In this case, the required fresh air volume is small, but the wet load of the fresh air accounts for 70-80%, for example. In order to cope with this situation, by adopting an air conditioning unit having a fresh air pretreatment unit 100 and a constant temperature and humidity unit 300 with the structure as described above, the fresh air pretreatment unit 100 can be used to pre-treat the fresh air by reducing enthalpy and cooling it separately, and then the pre-treated fresh air is subjected to the constant temperature and humidity unit 300 to be mixed with the primary return air to form a primary mixed air, and the primary mixed air is further subjected to rotary dehumidification in the rotary dehumidification section, and then, after being mixed with the secondary return air, it successively enters the dual-purpose cold and hot section 17 and the evaporation section 21 for isenthalpic cooling treatment to achieve low-temperature and low-humidity air supply, and thereafter, it successively passes through the electric heating section 22 and the humidification section 23 to fine-tune the supply air temperature and humidity, thereby reducing the energy consumption of fresh air dehumidification and improving the energy efficiency of the air conditioning system, and by setting up a multi-stage cooling and heating device which serves as a backup device for each other, it can ensure that the unit can operate uninterruptedly for a long time across different seasons.

[0096] The following describes the operation mode of the air conditioning unit according to the present application. It should be understood that the operation mode described here is only a specific example listed for the purpose of facilitating the understanding of the present application, and the present application is not limited thereto.

[0097] First, the operation mode of the fresh air pre-treatment unit 100 is described.

[0098] When the air conditioning unit is in cooling mode, for example, the main purpose of the fresh air pretreatment unit 100 is cooling conditions, and it is necessary to remove, for example, approximately 80% of the moisture content in the fresh air. In this case, for example, the supply air temperature of the fresh air pretreatment unit 100 is set to, for example, 8°C. Since when the unit meets the 8°C air outlet, the saturated relative humidity of 95% for mechanical refrigeration has been reached, the fresh air pretreatment unit only needs to control the supply air temperature. For example, taking the summer temperature of 42 / 31°C in a certain place as an example, in order to ensure that the first evaporator 8a and the second evaporator 8b will not frost, the temperature after the surface cooler 5b can be set to, for example, 12°C.

[0099] When the air-conditioning unit is in the heating mode, since the moisture content of the fresh air entering the fresh air pretreatment unit 100 meets the requirements, the air supply at 20°C can be achieved by using only the hot and cold dual-purpose coil 5a; in addition, the evaporation section 8 (the first evaporator 8a and the second evaporator 8b) can be used as a backup device for the hot and cold dual-purpose coil, so as to ensure 20°C heating in winter (for example, the temperature is -18 / -19°C).

[0100] As an example, in Figure 3 (a) and (b) respectively represent the working timing diagrams of the main components of the fresh air pre-treatment unit 100 in the heating mode and the cooling mode.

[0101] like Figure 3 As shown in (a), in the heating mode, for example, at time t0, the fresh air pretreatment unit 100 is turned on, and the fresh air valve 1, the pretreatment air supply valve 10 and the hot and cold dual-purpose coil 5a start to operate. After a specified time (for example, 120s), at time t1, the fresh air valve 1 and the pretreatment air supply valve 10 are opened to a predetermined position, and the pretreatment air supply fan set in the pretreatment air supply section 9 is turned on. At the same time, the control valve of the pretreatment cooling dual-purpose coil 5a is opened to the maximum opening. Then, if the outdoor unit needs to be started, after a specified time (for example, 60s), at time t2, the first outdoor unit 6 and the second outdoor unit 7 are turned on. After that, after a specified time (for example, 120s), at time t3, the first outdoor unit 6 and the second outdoor unit 7 are turned on. After running for a predetermined time, the fresh air pretreatment unit 100 is shut down as needed, for example, at time t4. During the operation from time t1 to time t4, the pre-treatment cooling dual-purpose coil 5a is operated according to the working condition of the fresh air pre-treatment unit 100, so as to control the opening of the pre-treatment cooling and heating dual-purpose coil 5a to the required opening. In addition, during the operation from time t3 to time t4, if the first external unit 6 and the second external unit 7 are in the on state, the compressor frequency of the two external units is adjusted according to the working condition of the fresh air pre-treatment unit 100. In addition, during the operation of the fresh air pre-treatment unit 100 in the heating mode, the surface cooler 5b remains in the off state. After a specified time (for example, 120s) has passed since the shutdown operation, at time t5, the pre-treatment cooling and heating dual-purpose coil 5a, the first external unit 6 and the second external unit 7 are turned off. Thereafter, after a specified time (for example, 60s), at time t6, the pre-treatment air supply fan set in the pre-treatment air supply section 9 is turned off, and at the same time, the fresh air valve 1 and the pre-treatment air supply valve 10 perform a closing action. Thereafter, after a prescribed time (eg, 120 seconds), at time t7, the fresh air valve 1 and the pre-treatment air supply valve 10 are closed to prescribed positions.

[0102] like Figure 3As shown in (b), in the cooling mode, for example, at t0′, the fresh air pretreatment unit 100 is turned on, and the fresh air valve 1, the pretreatment air supply valve 10 and the surface cooler 5b start to operate. After a specified time (for example, 120s), at t1′, the fresh air valve 1 and the pretreatment air supply valve 10 are opened to a predetermined position, the pretreatment air supply fan arranged in the pretreatment air supply section 9 is turned on, the surface cooler 5b is opened to the maximum opening, and at the same time, the pretreatment cooling dual-purpose coil 5a starts to start. Then, after a specified time (for example, 60s), at t2′, the first outdoor unit 6 and the second outdoor unit 7 are turned on. After that, after a specified time (for example, 120s), at t3′, the first outdoor unit 6 and the second outdoor unit 7 are turned on. In addition, at the time between t2′ and t3′, the pretreatment cooling and heating dual-purpose coil 5a is opened to the required opening according to the working conditions. After running for a predetermined time, the fresh air pre-processing unit 100 is shut down as required, for example, at time t4'. During the operation from time t1' to time t4', the surface cooler 5b is operated according to the working condition of the fresh air pre-processing unit 100, so as to control the opening of the surface cooler 5b to the required opening. In addition, during the operation from time t2' to t4', the compressor frequencies of the first external unit 6 and the second external unit 7 are adjusted according to the working condition of the fresh air pre-processing unit 100. In addition, if the pre-processing cold and hot dual-purpose coil 5a is turned on, the pre-processing cold and hot dual-purpose coil 5a is operated according to the working condition of the fresh air pre-processing unit 100 during the period when the pre-processing cold and hot dual-purpose coil 5a is in the turned-on state, so as to control the pre-processing cold and hot dual-purpose coil 5a to the required opening, or the pre-processing cold and hot dual-purpose coil 5a is turned off according to the working condition of the fresh air pre-processing unit 100. After a specified time (e.g. 120s) has passed since the shutdown operation was performed, at time t5′, the pretreatment cold and hot dual-purpose coil 5a, the first outdoor unit 6, and the second outdoor unit 7 are turned off. In addition, if the pretreatment cold and hot dual-purpose coil 5a is still in the turned-on state at this time, the pretreatment cold and hot dual-purpose coil 5a is turned off together. Thereafter, after a specified time (e.g. 60s), at time t6′, the pretreatment air supply fan set in the pretreatment air supply section 9 is turned off, and at the same time, the fresh air valve 1 and the pretreatment air supply valve 10 are closed. Thereafter, after a specified time (e.g. 120s), at time t7′, the fresh air valve 1 and the pretreatment air supply valve 10 are closed to the specified position.

[0103] Next, the operation of the constant temperature and humidity unit 300 will be described.

[0104] The pre-treated fresh air entering the constant temperature and humidity unit 300 through the pre-treated fresh air valve 11 is mixed with the primary return air valve 26a in the primary air mixing section, and then enters the rotary dehumidification section 13 as the primary mixed air. After being dehumidified by the rotary dehumidifier in the rotary dehumidification section 13, it enters the secondary mixed air section and mixes with the secondary return air from the secondary return air pipe 26b to form the secondary mixed air. After that, it is processed in the chemical filtration section 16, the hot and cold dual-purpose section 17, the intermediate section 18, the evaporation section 21, the electric heating section 22, and the humidification section 23 in sequence, and then is supplied to the room through the air supply section 24.

[0105] In order to control the supply air humidity at the required target humidity, the following control is performed: when the supply air humidity does not meet the demand, the primary return air valve is opened, and the rotary dehumidifier in the rotary dehumidification section 13 is turned on; when the supply air temperature meets the demand, the primary return air valve 26a and the rotary dehumidifier are closed, and the secondary return air valve 28 is fully opened.

[0106] As an example, a specific example of controlling the primary air mixing section 12, the rotary dehumidification section 13 and the secondary air mixing section 14 is described below:

[0107] For example, a temperature and humidity sensor (not shown) is provided after the evaporation section 21. When the temperature and humidity sensor detects that "absolute humidity content after the evaporator" > "target absolute humidity content after the evaporator" + "target absolute humidity content tolerance after the evaporator" for 5 consecutive seconds (i.e., the absolute humidity content after the evaporator exceeds the specified upper limit of humidity content), the primary return air valve 26a is opened to a predetermined opening, and the secondary return air valve 26b is maintained at a predetermined opening. After the primary return air valve 26a and the secondary return air valve 26b are at the predetermined opening, the rotary dehumidifier is turned on. For example, when the rotary dehumidifier is provided with two electric heating gears, both gears of electric heating are fully turned on.

[0108] After 60 seconds, on the one hand, if the temperature and humidity sensor still detects "absolute moisture content after evaporator" > "target absolute moisture content after evaporator" + "target absolute moisture content tolerance after evaporator" for 5 consecutive seconds, the opening of the primary return air valve 26a is increased, and the opening of the secondary return air valve 26b is reduced. For example, the primary return air valve 26a and the secondary return air valve 26b can be adjusted proportionally, that is, the opening of the primary return air valve 26a is increased proportionally and the opening of the secondary return air valve 26b is reduced.

[0109] On the other hand, if the temperature and humidity sensor detects "target absolute humidity content after evaporator" - "target absolute humidity content tolerance after evaporator" ≤ "absolute humidity content after evaporator" ≤ "target absolute humidity content after evaporator" + "target absolute humidity content tolerance after evaporator" for 5 consecutive seconds (that is, the absolute humidity content after the evaporator is within the specified humidity content range), the opening of the primary return air valve 26a and the secondary return air valve 26b will remain unchanged, and the electric heating gear of the rotary dehumidifier will remain unchanged.

[0110] On the other hand, if the temperature and humidity sensor detects that "absolute humidity after the evaporator" is less than "target absolute humidity after the evaporator" - "target absolute humidity after the evaporator tolerance" for 5 consecutive seconds (that is, the absolute humidity after the evaporator is less than the specified lower humidity limit), the primary return air valve 26a and the secondary return air valve 26b are kept unchanged, and the electric heating of the rotary dehumidifier is reduced (that is, turned off) by one gear. And, in the next electric heating gear switching cycle of the rotary dehumidifier (for example, 60 seconds), the above-mentioned action is repeated. Furthermore, when the electric heating gears (for example, two gears) of the rotary dehumidifier have all been turned off, but the temperature and humidity sensor still detects that "absolute humidity after the evaporator" is less than "target absolute humidity after the evaporator" - "target absolute humidity after the evaporator tolerance" for 5 consecutive seconds, the primary return air valve 26a is closed, and the secondary return air valve 26b is opened to the maximum opening.

[0111] As an example, in Figure 4 (a) and (b) respectively show the operating timing diagrams of the main components of the constant temperature and humidity unit 300 in the heating mode and the cooling mode.

[0112] like Figure 4As shown in (a), in the heating mode, for example, at time T0, the constant temperature and humidity unit 300 is turned on, and the pre-treatment fresh air valve 11, the primary return air valve 26a, the secondary return air valve 26b, the air supply valve 25, and the hot and cold dual-purpose coil 17a start to operate. After a specified time (for example, 120s), at time T1, the pre-treatment fresh air valve 11, the primary return air valve 26a, the secondary return air valve 26b, and the air supply valve are opened to a predetermined position, the control valve of the hot and cold dual-purpose coil 17a is opened to the maximum opening, and the air supply fan in the air supply section 24 is turned on. Then, after a specified time (for example, 60s), at time T2, the rotary dehumidifier in the rotary dehumidification section 13 is turned on. After that, after a specified time (e.g., 120s+9s), at time T4, the electric heater and humidifier (e.g., electric humidifier, electrode humidifier, etc.) in the electric heating section 22 and the humidifying section 23 are turned on. After running for a predetermined time, the constant temperature and humidity unit 300 is turned off as needed, for example, at time T5. During the operation from time T1 to time T5, the hot and cold dual-purpose coil 17a is operated according to the working conditions of the constant temperature and humidity unit 300 so as to control the opening of the hot and cold dual-purpose coil 17a to the required opening. During the operation from time T2 to time T5, the electric heating gear of the rotary dehumidifier in the rotary dehumidification section 13 is controlled as needed. And, during the operation from time T4 to time T5, the gear of the electric heater and the humidifier is controlled as needed. Furthermore, after a prescribed time (e.g., 120 seconds) has passed since the constant temperature and humidity unit 300 was shut down, at time T6, the cooling dual-purpose coil 17a is turned off. Thereafter, after a prescribed time (e.g., 60 seconds), at time T7, the air supply unit in the air supply section 24 is turned off, the air supply valve is closed, and the pre-treatment fresh air valve 11, the primary return air valve 26a, and the secondary return air valve 26b begin to close. During the period from time T1 to time T7 when the air supply unit is in the on state, the pre-treatment fresh air valve 11 remains open at a predetermined opening, and the primary return air valve 26a and the secondary return air valve 26b are operated according to the working conditions of the constant temperature and humidity unit 300 so as to control the opening of the primary return air valve 26a and the secondary return air valve 26b to the required opening. After a prescribed time (e.g., 120 seconds) has passed since time T7, at time T8, the closing of each air valve is completed. In addition, in the heating mode, the third outdoor unit 19 and the fourth outdoor unit 20 remain in the off state.

[0113] like Figure 4As shown in (b), in the cooling mode, for example, at T0′, the constant temperature and humidity unit 300 is turned on, and the pre-treatment fresh air valve 11, the primary return air valve 26a, the secondary return air valve 26b, the air supply valve 25, and the hot and cold dual-purpose coil 17a start to operate. After a specified time (for example, 120s), at T1′, the pre-treatment fresh air valve 11, the primary return air valve 26a, the secondary return air valve 26b, and the air supply valve are opened to a predetermined position, the control valve of the hot and cold dual-purpose coil 17a is opened to the maximum opening, and the air supply fan in the air supply section 24 is turned on. Then, after a specified time (for example, 60s), at T2′, the third outdoor unit 19 and the fourth outdoor unit 20, as well as the rotary dehumidifier in the rotary dehumidification section 13 are turned on. After that, after a specified time (for example, 120s), at T3′, the third outdoor unit 19 and the fourth outdoor unit 20 are turned on. Then, after a predetermined time (e.g., 9 seconds), at time T4′, the electric heater and humidifier in the electric heating section 22 and the humidifying section 23 are turned on. After running for a predetermined time, the constant temperature and humidity unit 300 is turned off as required, for example, at time T5′. During the operation from time T1′ to time T5′, the hot and cold dual-purpose coil 17a is operated according to the working condition requirements of the constant temperature and humidity unit 300, so as to control the opening of the hot and cold dual-purpose coil 17a to the required opening. During the operation from time T2′ to time T5′, the electric heating gear of the rotary dehumidifier in the rotary dehumidifying section 13 is controlled as required. During the operation from time T3′ to time T5′, the compressor frequency of the third external unit 19 and the fourth external unit 20 is controlled as required. And, during the operation from time T4′ to time T5′, the gear of the electric heater and the humidifier is controlled as required. Furthermore, after a prescribed time (e.g., 120 seconds) has passed since the constant temperature and humidity unit 300 was shut down, at time T6', the cooling dual-purpose coil 17a, the third outdoor unit 19, and the fourth outdoor unit 20 are shut down. Thereafter, after a prescribed time (e.g., 60 seconds), at time T7', the air supply unit in the air supply section 24 is shut down, the air supply valve is closed, and the pre-processing fresh air valve 11, the primary return air valve 26a, and the secondary return air valve 26b begin to close. During the period from time T1' to time T7' when the air supply unit is in the on state, the pre-processing fresh air valve 11 remains open at a predetermined opening, and the primary return air valve 26a and the secondary return air valve 26b are operated according to the working condition of the constant temperature and humidity unit 300 so as to control the opening of the primary return air valve 26a and the secondary return air valve 26b to the required opening. After a predetermined time (eg, 120 seconds) has passed from time T7', at time T8', the closing of each damper is completed.

[0114] By controlling the constant temperature and humidity unit 300 in the above manner, the absolute moisture content after evaporation can be controlled within the specified moisture content range, thereby achieving low-temperature and low-humidity air supply and accurate control of the temperature and humidity of the air supply. In addition, it should be noted that the above control method is only a specific example described for the convenience of explaining the present application, and the present application is not limited thereto. For example, within the scope of protection of the present application, appropriate changes can be made to various temperature and humidity parameters, as well as the working sequence of the unit, etc. according to actual needs.

[0115] The fresh air pre-treatment unit 100 and the constant temperature and humidity unit 300 provided in the air conditioning unit of the present application are described in detail above. Figure 5 As shown, the air conditioning unit of the present application can also be equipped with an air volume box 200 between the fresh air pre-processing unit 100 and the constant temperature and humidity unit 300. In this case, the pre-treated fresh air after pre-processing by the fresh air pre-processing unit 100 enters the constant temperature and humidity unit 300 via the air volume box 200, and after being subjected to constant temperature and humidity treatment in the constant temperature and humidity unit 300, is discharged to the room of the place where air conditioning is required, so as to maintain a constant temperature and humidity environment indoors. By configuring the air volume box 200 between the fresh air pre-processing unit 100 and the constant temperature and humidity unit 300, the air volume of the pre-treated fresh air entering the constant temperature and humidity unit 300 can be more conveniently controlled.

[0116] In addition, the air conditioning unit of the present application is not limited to being equipped with only one fresh air pre-treatment unit and one constant temperature and humidity unit. Instead, it can be equipped with multiple fresh air pre-treatment units and constant temperature and humidity units as needed. For example, Figure 6 As shown, the air conditioning unit can be equipped with a fresh air pre-processing unit 100 and multiple ( Figure 6 2) constant temperature and humidity units 300a, 300b; or, Figure 7 As shown, multiple ( Figure 7 There are 2) fresh air pre-treatment units 100a, 100b and multiple ( Figure 7 By equipping multiple fresh air pre-treatment units and multiple constant temperature and humidity units, each fresh air pre-treatment unit and each constant temperature and humidity unit can be used as a backup unit for each other, so that the air conditioning unit can be operated 24 hours a day throughout the year.

[0117] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the claims and specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. An air conditioning system, characterized in that: include: A fresh air pretreatment unit, wherein the fresh air pretreatment unit pretreatments the temperature and humidity of the fresh air to obtain pretreated fresh air; as well as A constant temperature and humidity unit is connected in series with the fresh air pretreatment unit, the pretreated fresh air is mixed with the primary return air to form a primary mixed air, and the primary mixed air is dehumidified, and then the primary mixed air after the dehumidification treatment is mixed with the secondary return air to form a secondary mixed air, and the temperature and humidity of the secondary mixed air are finely adjusted.

2. The air conditioning system according to claim 1, characterized in that: The fresh air pretreatment unit comprises an air intake section, a pretreatment filtering section, a pretreatment cold and hot dual-purpose section, a pretreatment evaporation section, and a pretreatment air supply section.

3. The air conditioning system according to claim 2, characterized in that: In the pretreatment hot and cold dual-purpose section, a pretreatment hot and cold dual-purpose coil and / or a surface cooler are provided, and in the pretreatment evaporation section, a first evaporator and / or a second evaporator are provided.

4. The air conditioning system according to any one of claims 1 to 3, characterized in that: The constant temperature and humidity unit comprises a primary air mixing section, a rotary dehumidification section, a secondary air mixing section, a filtering section, a cold and hot dual-purpose section, an evaporation section, an electric heating section, a humidification section, and an air supply section.

5. The air conditioning system according to claim 4, characterized in that: In the dual-purpose cold and hot section, a dual-purpose cold and hot coil is provided, and in the evaporation section, a third evaporator and / or a fourth evaporator is provided.

6. The air conditioning system according to claim 5, characterized in that: The constant temperature and humidity unit further comprises a primary return air duct and a secondary return air duct, wherein the primary return air duct is connected to the primary air mixing section, and the secondary return air duct is connected to the secondary air mixing section. The rotary dehumidification section is arranged between the primary air mixing section and the secondary air mixing section.

7. The air conditioning system according to claim 6, characterized in that: A primary return air valve is provided at a position where the primary return air duct is connected to the primary air mixing section, and a secondary return air valve is provided at a position where the secondary return air duct is connected to the secondary air mixing section.

8. The air conditioning system according to any one of claims 1 to 3, characterized in that: An air volume box is also provided between the fresh air pretreatment unit and the constant temperature and humidity unit.

9. The air conditioning system according to any one of claims 1 to 3, characterized in that: The air conditioning system comprises a plurality of constant temperature and humidity units arranged in parallel.

10. The air conditioning system according to any one of claims 1 to 3, characterized in that: The air conditioning system comprises a plurality of fresh air pre-treatment units arranged in parallel and a plurality of constant temperature and humidity units arranged in parallel.

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