Fresh air handling unit, control method thereof and plant cleaning system

Abstract

The invention discloses a fresh air handling unit and a control method thereof and a plant cleaning system.The fresh air handling unit comprises a surface cooling section, an air conditioning section and a control section, the reheating section is used for heating the air; the energy supply system comprises an evaporator and a condenser of the air conditioning system, the evaporator is arranged on the surface cooling section and used for providing cooling capacity for the surface cooling section, and the condenser is arranged on the reheating section and used for providing heat for the reheating section. The problems that in the prior art, the requirement for cold and heat of the low-temperature dehumidification section and the reheating section of a fresh air handling unit is high, and the energy consumption of the fresh air handling unit is high are solved, the energy consumption of fresh air treatment is reduced, and the energy efficiency of the fresh air handling unit is improved on the basis of guaranteeing the reliability of the fresh air handling unit.

Description

Technical Field

[0001] The present invention relates to the field of fresh air technology, and in particular to a fresh air unit and a control method thereof, and a plant cleaning system. Background Art

[0002] A heat exchanger is a process device widely used in metallurgy, refrigeration, chemical industry and other industrial fields to realize heat exchange between fluids. It usually refers to a two-medium heat exchanger, while a three-medium heat exchanger can realize heat exchange between three fluids (mediums) at the same time, with a simplified structure and lightweight integration.

[0003] The air conditioning system of clean rooms such as semiconductor factories uses MAU (Make-up Air Unit) units to process the air. The fresh air is sent into the clean room after being processed through preheating, precooling, humidification, low-temperature dehumidification, and reheating. At the same time, the fresh air is also used to maintain the indoor pressure balance. Therefore, the amount of fresh air processed by the MAU unit in the clean room is very large, and the corresponding energy consumption is huge.

[0004] Conventional air-conditioning systems use chilled water and hot water to solve the cooling and heating needs of the low-temperature dehumidification stage and the reheating stage respectively. However, the cooling and heating demand between the low-temperature dehumidification section and the reheating section is relatively high in this method, so the energy consumption of the fresh air unit is relatively high.

[0005] With regard to the problems in related technologies of high demand for cold and heat in the low-temperature dehumidification section and reheating section of the fresh air unit and high energy consumption of the fresh air unit, no effective solution has been proposed so far. Summary of the invention

[0006] The present invention provides a fresh air unit and a control method thereof, and a plant clean system, so as to at least solve the problems in the prior art of high heat and cold requirements of the low-temperature dehumidification section and the reheating section of the fresh air unit and high energy consumption of the fresh air unit.

[0007] To solve the above technical problems, according to one aspect of an embodiment of the present invention, a fresh air unit is provided, comprising: a surface cooling section for dehumidifying air at low temperature; a reheat section for heating and heating the air; and an energy supply system, wherein the energy supply system comprises an evaporator and a condenser of an air-conditioning system, wherein the evaporator is arranged in the surface cooling section for providing cooling to the surface cooling section, and the condenser is arranged in the reheat section for providing heat to the reheat section.

[0008] Furthermore, the evaporator and the condenser are both three-medium heat exchangers, and the three-medium heat exchanger includes: an outer tube, an inner tube and fins, the fluid in the outer tube is a first fluid, the fluid in the inner tube is a second fluid, and the fluid at the fins is air; wherein the second fluid is a refrigerant.

[0009] Furthermore, the energy supply system also includes: a low-temperature cooling water pipe, located in the surface cooling section, used to pass external low-temperature cooling water into the surface cooling section when the cooling capacity provided by the air-conditioning system is insufficient, so as to provide cooling capacity for the surface cooling section; a hot water pipe, located in the reheat section, used to pass external hot water into the reheat section when the heat provided by the air-conditioning system is insufficient, so as to provide heat for the surface cooling section.

[0010] According to another aspect of an embodiment of the present invention, a fresh air unit control method is provided, which is applied to the fresh air unit as described above, and the method includes: detecting the cooling capacity required by the surface cooling section and the heat required by the reheat section of the fresh air unit; judging the relationship between the cooling capacity required by the surface cooling section and the heat required by the reheat section; and controlling the operation of the energy supply system according to the relationship between the cooling capacity required by the surface cooling section and the heat required by the reheat section.

[0011] Furthermore, the operation of the energy supply system is controlled according to the relationship between the cooling capacity required by the surface cooling section and the heat required by the reheat section, including: adjusting the operating parameters of the energy supply system so that the energy supply system preferentially satisfies the smaller of the cooling capacity required by the surface cooling section and the heat required by the reheat section; after the smaller of the cooling capacity required by the surface cooling section and the heat required by the reheat section is satisfied, further adjusting the operating parameters of the energy supply system so that the energy supply system satisfies the larger of the cooling capacity required by the surface cooling section and the heat required by the reheat section.

[0012] Furthermore, the operating parameters of the energy supply system are adjusted so that the energy supply system gives priority to meeting the smaller of the cooling capacity required by the surface cooling section and the heat required by the reheat section, including: when the cooling capacity required by the surface cooling section is less than or equal to the heat required by the reheat section, determining whether the rated cooling capacity of the evaporator of the air-conditioning system is greater than or equal to the cooling capacity required by the surface cooling section; if so, adjusting the operating frequency of the compressor of the air-conditioning system so that the current cooling capacity of the evaporator reaches the cooling capacity required by the surface cooling section; otherwise, controlling the compressor of the air-conditioning system to the maximum operating frequency to provide the rated cooling capacity, and controlling the low-temperature cooling water pipe of the energy supply system to open, and adjusting the water flow rate of the low-temperature cooling water pipe until the cooling capacity provided by the energy supply system meets the cooling capacity required by the surface cooling section.

[0013] Furthermore, the operating parameters of the energy supply system are adjusted so that the energy supply system gives priority to meeting the smaller of the cooling capacity required by the surface cooling section and the heat required by the reheat section, including: when the cooling capacity required by the surface cooling section is greater than the heat required by the reheat section, determining whether the rated heating capacity of the condenser of the air-conditioning system is greater than or equal to the heat required by the reheat section; if so, adjusting the operating frequency of the compressor of the air-conditioning system so that the current heating capacity of the condenser reaches the heat required by the reheat section; otherwise, controlling the compressor of the air-conditioning system to the maximum operating frequency to provide the rated heating capacity, and controlling the warm water pipe of the energy supply system to open, and adjusting the water flow rate of the warm water pipe until the heat provided by the energy supply system meets the heat required by the reheat section.

[0014] Furthermore, the operating parameters of the energy supply system are further adjusted so that the energy supply system meets the larger of the cooling capacity required by the surface cooling section and the heat capacity required by the reheating section, including:

[0015] Determine whether the rated heating capacity of the condenser of the air-conditioning system is equal to the heat required by the reheat section or is less than the heat required by the reheat section; when the rated heating capacity is equal to the heat required by the reheat section, maintain the current operating parameters of the energy supply system; when the rated heating capacity is less than the heat required by the reheat section, control the warm water pipe of the energy supply system to open, and adjust the water flow rate of the warm water pipe until the heat provided by the energy supply system meets the heat required by the reheat section.

[0016] Furthermore, the operating parameters of the energy supply system are further adjusted so that the energy supply system meets the larger of the cooling capacity required by the surface cooling section and the heat required by the reheat section, including: judging whether the rated cooling capacity of the evaporator of the air-conditioning system is equal to the cooling capacity required by the surface cooling section or whether it is less than the cooling capacity required by the surface cooling section; when the rated cooling capacity is equal to the cooling capacity required by the surface cooling section, maintaining the current operating parameters of the energy supply system; when the rated cooling capacity is less than the cooling capacity required by the surface cooling section, controlling the low-temperature cooling pipe of the energy supply system to open, and adjusting the water flow of the low-temperature cooling pipe until the cooling capacity provided by the energy supply system meets the cooling capacity required by the surface cooling section.

[0017] According to another aspect of an embodiment of the present invention, a factory cleaning system is provided, and the factory cleaning system includes the fresh air unit as described above.

[0018] According to another aspect of an embodiment of the present invention, there is provided a storage medium comprising computer executable instructions, wherein the computer executable instructions are used to execute the above-mentioned fresh air unit control method when executed by a computer processor.

[0019] In the present invention, a fresh air unit is provided. Aiming at the problem of the demand for cold and heat in the low-temperature dehumidification section and the reheating section of the fresh air unit, two heat exchangers are arranged in the fresh air unit, which are connected with the compressor, throttle valve and other components to form an independent air conditioning system, wherein one heat exchanger is an evaporator in the air conditioning system, which plays a role in low-temperature dehumidification of the fresh air, and the other heat exchanger is a condenser in the air conditioning system, which reheats the low-temperature and low-humidity air to the set outlet temperature. Through the evaporator and condenser of the air conditioning system, the heat required for processing the air is taken away and supplemented by the phase change heat absorption and heat release process of the refrigerant in the refrigeration cycle, and the cold and heat between the low-temperature dehumidification section and the reheating section in the fresh air unit are reasonably transferred and utilized, thereby reducing the energy loss and waste of the air conditioning system in the traditional fresh air unit, reducing the energy consumption of fresh air processing, reducing the installed capacity of the external cold and heat source of the fresh air unit, saving the investment in the host equipment of the fresh air unit, and improving the energy efficiency of the fresh air unit on the basis of ensuring the reliability of the fresh air unit. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is an optional structural schematic diagram of a fresh air unit according to an embodiment of the present invention;

[0021] Figure 2 This is an optional structural schematic diagram of a fin-tube three-medium heat exchanger according to an embodiment of the present invention;

[0022] Figure 3 is an optional flow chart of a fresh air unit control method according to an embodiment of the present invention;

[0023] Figure 4 It is another optional flow chart of the fresh air unit control method according to an embodiment of the present invention.

[0024] Description of reference numerals:

[0025] 1. Precooling section; 2. Preheating section; 3. Humidification section; 4. Low-temperature dehumidification section; 5. Reheat section; 6. Fan section; 7. Throttle valve; 8. Compressor; 9. Evaporator; 10. Condenser; 11. Pipeline valve; 12. Pipeline valve; 13. Pipeline valve; 14. Clean room; 15. Cooling tower; 16. Chiller; 17. Outer pipe; 18. Inner pipe; 19. Fin; 20. Water; 21. Refrigerant; 22. Air; 101. Low-temperature chilled water pipe; 102. Hot water pipe; 103. Refrigerant pipe; 104. Fresh air pipe; 105. Medium-temperature chilled water pipe; 106. Cooling water pipe. DETAILED DESCRIPTION

[0026] In order to make the purpose, technical scheme and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0027] The terms used in the embodiments of the present invention are only for the purpose of describing specific embodiments, and are not intended to limit the present invention. The singular forms "a", "said" and "the" used in the embodiments of the present invention and the appended claims are also intended to include plural forms, unless the context clearly indicates other meanings, and "multiple" generally includes at least two.

[0028] It should be understood that the term "and / or" used in this article is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0029] It should be understood that although the terms first, second, third, etc. may be used to describe controllers in embodiments of the present invention, these controllers should not be limited to these terms. These terms are only used to distinguish controllers connected to different devices. For example, without departing from the scope of embodiments of the present invention, a first controller may also be referred to as a second controller, and similarly, a second controller may also be referred to as a first controller.

[0030] As used herein, the words "if" and "if" may be interpreted as "at the time of" or "when" or "in response to determining" or "in response to detecting", depending on the context. Similarly, the phrases "if it is determined" or "if (stated condition or event) is detected" may be interpreted as "when it is determined" or "in response to determining" or "when detecting (stated condition or event)" or "in response to detecting (stated condition or event)", depending on the context.

[0031] It should also be noted that the term "includes", "comprising" or any other variation thereof is intended to cover non-exclusive inclusion, so that a commodity or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such commodity or device. In the absence of more restrictions, the elements defined by the sentence "comprising a ..." do not exclude the existence of other identical elements in the commodity or device including the elements.

[0032] The optional embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0033] Example 1

[0034] In clean environments such as semiconductor production plants, the relative humidity of the clean room is handled by the MAU (fresh air unit), the temperature of the clean room is handled by the DCC (dry cooling coil), and the cleanliness of the clean room is handled by the FFU (fan filter unit). The fresh air unit configured in the clean room often needs to handle a large amount of fresh air. In the prior art, a surface cooling section (low-temperature dehumidification section) needs to be set in the fresh air unit to cool and dehumidify the air, and a reheating section needs to be set to heat the air with too low a temperature to the target temperature. Additional energy is consumed in these two functional sections.

[0035] In a preferred embodiment 1 of the present invention, a fresh air unit is provided. Specifically, Figure 1 An optional structural schematic diagram of the fresh air unit is shown, such as Figure 1 As shown, the fresh air unit includes:

[0036] Surface cooling section 4, used for low-temperature dehumidification of air;

[0037] Reheating section 5, used to heat the air;

[0038] The energy supply system includes an evaporator 9 and a condenser 10 of the air-conditioning system, wherein the evaporator 9 is arranged in the surface cooling section 4 for providing cooling capacity for the surface cooling section, and the condenser 10 is arranged in the reheating section 5 for providing heat for the reheating section.

[0039] In the above embodiment, a fresh air unit is provided. To solve the problem of the demand for cold and heat in the low-temperature dehumidification section and the reheating section of the fresh air unit, two heat exchangers are arranged in the fresh air unit, which are connected with the compressor, throttle valve and other components to form an independent air conditioning system, wherein one heat exchanger is an evaporator in the air conditioning system, which plays a role in low-temperature dehumidification of the fresh air, and the other heat exchanger is a condenser in the air conditioning system, which reheats the low-temperature and low-humidity air to the set outlet temperature. Through the evaporator and condenser of the air conditioning system, the heat required for processing the air is taken away and supplemented by the phase change heat absorption and heat release process of the refrigerant in the refrigeration cycle, and the cold and heat between the low-temperature dehumidification section and the reheating section in the fresh air unit are reasonably transferred and utilized, thereby reducing the energy loss and waste of the air conditioning system in the traditional fresh air unit, reducing the energy consumption of fresh air processing, reducing the installed capacity of the external cold and heat source of the fresh air unit, saving the investment in the host equipment of the fresh air unit, and improving the energy efficiency of the fresh air unit on the basis of ensuring the reliability of the fresh air unit.

[0040] like Figure 1As shown, the fresh air unit also includes: precooling section 1, preheating section 2, humidification section 3, fan section 6, throttle valve 7, compressor 8, pipeline valves 11, 12, 13, fresh air pipeline 104, medium temperature chilled water pipeline 105, cooling water pipeline 106. This structural diagram focuses on showing the core point of the fresh air unit of the present invention, that is, the heat exchanger in the fresh air unit and its relationship with the overall air conditioning system, so some functional sections such as the filter section are not shown in the figure, and the exhaust system in the clean room is not shown and introduced in this structural diagram.

[0041] Preferably, the evaporator and the condenser are both three-medium heat exchangers, and the three-medium heat exchanger can be a fin-tube three-medium heat exchanger. Figure 2 An optional structural schematic diagram of a fin-tube three-medium heat exchanger is shown, such as Figure 2 As shown, the three-medium heat exchanger includes: an outer tube 17, an inner tube 18 and fins 19, the fluid in the outer tube is water, the fluid in the inner tube is a refrigerant, and the fluid at the fins is air. Through the above-mentioned heat exchange pipeline design, the three-medium heat exchanger can realize the mutual heat exchange between the first medium channel and the second medium channel. By setting the heat exchange fins, the third medium can also exchange heat with the first medium and / or the second medium. Its structure is simple, overcomes the limitations of traditional heat exchangers, and provides higher heat exchange efficiency and flexibility. The present invention applies the three-medium heat exchanger to the fresh air unit, which can provide sufficient cold and heat for the surface cooling section and the reheating section, meet the cold and heat requirements of the low-temperature dehumidification section and the reheating section of the fresh air unit, and does not require additional energy supplement, which is conducive to saving the energy consumption of the fresh air unit and the equipment cost investment. The three-medium heat exchanger can realize the functions of heat exchange between the three media in pairs and heat exchange between the three media at the same time, and it is not easy to get dirty and blocked when exchanging heat with the third medium, which can improve the heat exchange reliability and heat exchange effect. The use of a three-medium heat exchanger in the MAU fresh air unit can reasonably transfer and utilize the energy between the surface cooling section and the reheating section for the equipment. The traditional mode is: the energy required by the fresh air unit is taken away / provided by the cold water pipe and the hot water pipe, and the cold and heat therein are prepared by consuming energy separately, and two independent power systems are required to transport the cold and heat. In the present invention, due to the use of a three-medium heat exchanger, when the cold and heat energy of the surface cooling section and the reheating section match each other, no additional equipment is required to consume energy to prepare this cold and heat. It is only necessary to combine the surface cooling, reheating section, compressor, and throttling device into a small refrigeration system so that the refrigerant can act, phase change, and transfer cold and heat. Only when the cold and heat obtained by this small refrigeration system does not meet the terminal demand, additional cold and hot water is required as an auxiliary source to supplement the corresponding cold and heat.

[0042] like Figure 1As shown, the energy supply system also includes: a low-temperature cooling water pipe 101, located in the surface cooling section, used to pass external low-temperature cooling water into the surface cooling section when the cooling capacity provided by the air-conditioning system is insufficient, so as to provide cooling capacity for the surface cooling section; a hot water pipe 102, located in the reheating section, used to pass external hot water into the reheating section when the heat provided by the air-conditioning system is insufficient, so as to provide heat for the surface cooling section. The external cold and heat sources are used as backup energy sources for the system, and when the cold and heat provided by the air-conditioning system are insufficient, external cold and hot water are used to supplement them, so as to ensure that the cooling and heating requirements of the fresh air unit are met, while reducing the installed capacity of the cold and heat sources.

[0043] In the prior art, a surface cooling section is required in the fresh air unit to cool and dehumidify the air, and a reheating section is required to heat the air with too low a temperature to the target temperature. Both functional sections require additional energy consumption. In the present invention, two three-medium heat exchangers are arranged in the surface cooling section and the reheating section of the fresh air unit respectively, and the compressor and the throttle valve are connected to form a refrigeration system. The heat required for processing the air is taken away and supplemented by the phase change heat absorption and heat release process of the refrigerant in the refrigeration cycle, and the role of the low-temperature dehumidification section and the reheating section in the fresh air unit is played, without consuming additional energy, and the heat absorption and heat release process of the refrigerant in the evaporator and condenser is perfectly utilized, without energy waste.

[0044] Example 2

[0045] Aiming at the problem of alternating consumption of cold and heat in the low-temperature dehumidification and reheating functional sections of the fresh air unit used in the clean workshop, two three-medium heat exchangers are set in the fresh air unit to connect the throttle valve and the compressor to form an independent refrigeration system in combination with the characteristics of the three-medium heat exchanger device. This composite energy refrigeration and air conditioning system based on the three-medium heat exchanger has multiple control switching modes, and the system mode is switched according to the amount of cold and heat required in the low-temperature dehumidification and reheating stages during the fresh air processing process.

[0046] In a preferred embodiment 2 of the present invention, a fresh air unit control method is provided, which is applied to the fresh air unit in the above embodiment 1. Specifically, Figure 3 An optional flow chart of the method is shown as follows: Figure 3 As shown, the method includes the following steps S302-S306:

[0047] S302: Detecting the cooling capacity required by the surface cooling section and the heat required by the reheating section of the fresh air unit;

[0048] S304: Determine the relationship between the cooling capacity required by the surface cooling section and the heat capacity required by the reheating section;

[0049] S306: Control the operation of the energy supply system according to the relationship between the cooling capacity required by the surface cooling section and the heat capacity required by the reheating section.

[0050] In the above embodiment, a fresh air unit is provided. To solve the problem of the demand for cold and heat in the low-temperature dehumidification section and the reheating section of the fresh air unit, two heat exchangers are arranged in the fresh air unit, which are connected with the compressor, throttle valve and other components to form an independent air conditioning system, wherein one heat exchanger is an evaporator in the air conditioning system, which plays a role in low-temperature dehumidification of the fresh air, and the other heat exchanger is a condenser in the air conditioning system, which reheats the low-temperature and low-humidity air to the set outlet temperature. Through the evaporator and condenser of the air conditioning system, the heat required for processing the air is taken away and supplemented by the phase change heat absorption and heat release process of the refrigerant in the refrigeration cycle, and the cold and heat between the low-temperature dehumidification section and the reheating section in the fresh air unit are reasonably transferred and utilized, thereby reducing the energy loss and waste of the air conditioning system in the traditional fresh air unit, reducing the energy consumption of fresh air processing, reducing the installed capacity of the external cold and heat source of the fresh air unit, saving the investment in the host equipment of the fresh air unit, and improving the energy efficiency of the fresh air unit on the basis of ensuring the reliability of the fresh air unit.

[0051] like Figure 1 As shown, during the process of the refrigerant involved in the present invention passing through the refrigeration components and phase change in the refrigerant circulation pipeline, the heat absorbed by the refrigerant in the evaporator, i.e., the refrigeration capacity (rated cooling capacity of the evaporator), is set to A, and the heat released by the refrigerant in the condenser 10, i.e., the heating capacity (rated heating capacity of the condenser), is set to B accordingly. The cooling load (the cooling capacity required by the cooling section) required by the fresh air handling unit is A1, and the heat load (the heat required by the reheating section) is B1. The control in the present invention is based on the premise that the minimum cooling and heating capacity of the system meets the minimum cooling and heating load requirements, that is, there is no situation where the minimum cooling and heating capacity exceeds the cooling and heating loads. At the same time, the cooling and heating loads are positively correlated, that is, the larger the cooling load, the larger the corresponding heat load, and the larger the cooling load, the larger the corresponding heat load, that is, there is no situation where the cooling load is very large and the heat load is very small, or the cooling load is very small and the heat load is very large.

[0052] In a preferred embodiment of the present invention, the control scheme of the fresh air unit is judged and switched as follows: the operation of the energy supply system is controlled according to the relationship between the required cooling capacity of the surface cooling section and the required heat of the reheating section, including: adjusting the operating parameters of the energy supply system so that the energy supply system preferentially meets the smaller of the required cooling capacity of the surface cooling section and the required heat of the reheating section; after the smaller of the required cooling capacity of the surface cooling section and the required heat of the reheating section is met, further adjusting the operating parameters of the energy supply system so that the energy supply system meets the larger of the required cooling capacity of the surface cooling section and the required heat of the reheating section. The independent refrigeration system composed of three-medium heat exchangers preferentially meets the relatively smaller load demand in the cold and heat loads, and compares the large load with the capacity and makes corresponding adjustments when the small load is met by adjusting the compressor frequency or increasing the external cold and heat source. Because if the relatively larger demand is met first, it will cause too much energy in another section and excessive air processing to exceed the target value. Or other means are needed to lead out the excess energy, but this will cause energy waste. Therefore, the small demand is met first, and the large demand is not enough, and it is supplemented by external auxiliary cold and heat sources. On the whole, this system can not only meet the energy requirements of the surface cooling section and the reheating section, but also transfer and utilize the energy of these two sections (the refrigerant absorbs heat when evaporating, and this process is realized in the three-medium heat exchanger at the surface cooling section, taking away the heat of the air here; the refrigerant condenses in the three-medium heat exchanger at the reheating section to release heat and heat the target processed air). Through the above scheme, the energy supply system is gradually adjusted to meet the required cold and heat of the surface cooling section and the reheating section, avoiding energy waste and further improving the energy utilization rate of the energy supply system.

[0053] Specifically, the operating parameters of the energy supply system are adjusted so that the energy supply system gives priority to meeting the smaller of the cooling capacity required by the surface cooling section and the heat required by the reheat section, including: when the cooling capacity required by the surface cooling section is less than or equal to the heat required by the reheat section, determining whether the rated cooling capacity of the evaporator of the air-conditioning system is greater than or equal to the cooling capacity required by the surface cooling section; if so, adjusting the operating frequency of the compressor of the air-conditioning system so that the current cooling capacity of the evaporator reaches the cooling capacity required by the surface cooling section; otherwise, controlling the compressor of the air-conditioning system to the maximum operating frequency to provide the rated cooling capacity, and controlling the low-temperature cooling water pipe of the energy supply system to open, and adjusting the water flow rate of the low-temperature cooling water pipe until the cooling capacity provided by the energy supply system meets the cooling capacity required by the surface cooling section. When the required cooling capacity of the surface cooling section is greater than the required heat of the reheating section, determine whether the rated heat supply of the condenser of the air-conditioning system is greater than or equal to the required heat of the reheating section; if so, adjust the operating frequency of the compressor of the air-conditioning system so that the current heat supply of the condenser reaches the required heat of the reheating section; otherwise, control the compressor of the air-conditioning system to the maximum operating frequency, provide the rated heat supply, and control the opening of the warm water pipe of the energy supply system, and adjust the water flow of the warm water pipe until the heat provided by the energy supply system meets the required heat of the reheating section. When the rated cooling and heat supply of the evaporator of the air-conditioning system is greater than or equal to the required cooling and heat supply, the compressor frequency is maintained or reduced to make the cooling and heat output of the air-conditioning system adapt to the demand, and the evaporator or condenser bears all the load requirements without the need to supplement the external cooling source or heat source; when the rated cooling and heat supply of the evaporator of the air-conditioning system is less than the required cooling and heat supply, the compressor frequency is increased and adjusted to the maximum operating frequency, the evaporator or condenser bears part of the load, and the chilled water or hot water bears the remaining load, so that the required cooling capacity of the surface cooling section and the required heat of the reheating section are met.

[0054] After the smaller of the required cooling capacity of the surface cooling section and the required heat of the reheating section is supplied, the operating parameters of the energy supply system are further adjusted so that the energy supply system meets the larger of the required cooling capacity of the surface cooling section and the required heat of the reheating section, including: judging whether the rated heating capacity of the condenser of the air-conditioning system is equal to the required heat of the reheating section or is less than the required heat of the reheating section; when the rated heating capacity is equal to the required heat of the reheating section, the current operating parameters of the energy supply system are maintained; when the rated heating capacity is less than the required heat of the reheating section, the warm water pipe of the energy supply system is controlled to open, and the water flow of the warm water pipe is adjusted until the heat provided by the energy supply system meets the required heat of the reheating section. Judging whether the rated cooling capacity of the evaporator of the air-conditioning system is equal to the required cooling capacity of the surface cooling section or is less than the required cooling capacity of the surface cooling section; when the rated cooling capacity is equal to the required cooling capacity of the surface cooling section, the current operating parameters of the energy supply system are maintained; when the rated cooling capacity is less than the required cooling capacity of the surface cooling section, the low-temperature cooling pipe of the energy supply system is controlled to open, and the water flow of the low-temperature cooling pipe is adjusted until the cooling capacity provided by the energy supply system meets the required cooling capacity of the surface cooling section. When the rated cooling and heating capacity of the evaporator of the air-conditioning system is equal to the required cooling and heating capacity, the compressor frequency is maintained so that the cooling and heating capacity output by the air-conditioning system is adapted to the demand, and the evaporator or condenser bears all the load demand without the need to supplement an external cooling or heating source; when the rated cooling and heating capacity of the evaporator of the air-conditioning system is less than the required cooling and heating capacity, the compressor frequency is increased and adjusted to the maximum operating frequency, the evaporator or condenser bears part of the load, and the chilled water or hot water bears the remaining load, thereby meeting the cooling capacity required by the surface cooling section and the heat required by the reheating section.

[0055] Conventional air conditioning systems use chilled water and hot water to solve the cooling and heating requirements of the low-temperature dehumidification section and the reheating section respectively. However, in the present invention, two three-medium heat exchangers are set up, connected with the compressor and the throttle valve to form an independent heat recovery system, one of which is used as an evaporator among the four major refrigeration components to dehumidify the fresh air at low temperature, and the other is used as a condenser among the four major refrigeration components to heat the low-temperature and low-humidity air to the set temperature. At the same time, when the cooling and heating amount provided by the phase change of the refrigerant is not enough to solve the cooling and heating load requirements, chilled water or hot water is used as the system supplementary energy. This comprehensive energy system has high reliability and can reduce the energy consumption of fresh air processing.

[0056] Another method for controlling a fresh air unit is provided in a preferred embodiment 2 of the present invention. Specifically, Figure 4 An optional flow chart of the method is shown as follows: Figure 4 As shown, the method includes the following steps S401-S413:

[0057] S401: A1≤B1, the cooling load that the fresh air unit needs to meet is A1, and the heating load is B1. Determine the size of the two. If A1≤B1, go to step S402, otherwise go to step S408;

[0058] S402: The compressor frequency is adjusted to A = A1. That is, when the cooling capacity A1 required by the fresh air low-temperature dehumidification section in the fresh air handling unit is less than or equal to the heat required by the reheating section B1, the relationship between the refrigeration capacity A and the cooling load A1 is preferentially determined. When A ≥ A1, the compressor frequency remains unchanged or is reduced to A = A1;

[0059] S403: Valve 11 is closed, and the evaporator 9 undertakes the cooling load A1;

[0060] S404: The compressor frequency is adjusted to the maximum, valve 11 is opened, and the chilled water 101 undertakes the (A1 - A) cooling load; when A < A1, the compressor frequency is increased, valve 11 is opened, the evaporator 9 undertakes part of the cooling load A, and the chilled water undertakes part of the (A1 - A) cooling load;

[0061] S405: B = B1; After the system refrigeration capacity A matches the cooling load (small), the relationship between the heat load (large) and the heating capacity B is determined;

[0062] S406: Valve 12 is closed, and the condenser 10 undertakes the heat load B1. That is, when B = B1, the condenser 10 undertakes all the heat load B1, and there is no need to supplement external heat sources, and valve 12 remains closed;

[0063] S407: Valve 12 is opened, and the hot water 102 undertakes the heat load (B1 - B). When B < B1, valve 12 is opened, the condenser 10 undertakes part of the heat load B, and the hot water undertakes part of the (B1 - B) heat load;

[0064] S408: The compressor frequency is adjusted to B = B1; When the cooling capacity A1 required by the fresh air low-temperature dehumidification section in the fresh air handling unit is greater than the heat required by the reheating section B1, the relationship between the heating capacity B and the heat load B1 is preferentially determined. When B ≥ B1, go to S409; when B < B1, go to S410;

[0065] S409: Valve 12 is closed, and the condenser 10 undertakes the heat load B1; When B ≥ B1, the compressor frequency remains unchanged or is reduced to B = B1, the condenser 10 undertakes all the heat load B1, and there is no need to supplement external heat sources, and valve 12 remains closed;

[0066] S410: The compressor frequency is adjusted to the maximum, valve 12 is opened, and the hot water 102 undertakes the (B1 - B) heat load; When B < B1, the compressor frequency is increased, valve 12 is opened, the condenser 10 undertakes part of the heat load B, and the hot water undertakes part of the (B1 - B) heat load;

[0067] S411: A = A1. After the system heating capacity B matches the heat load (small), the relationship between the cooling load (large) and the refrigeration capacity A is determined. When A = A1, go to S412; when A < A1, go to S413;

[0068] S412: Valve 11 is closed, and evaporator 9 bears cooling load A1; when A=A1, evaporator 9 bears the entire cooling load A1, and no external cooling source is required, and valve 11 remains closed;

[0069] S413: Valve 11 is opened, and chilled water 101 bears (A1-A) cooling load; valve 11 is opened, evaporator 9 bears part A of cooling load, and hot water bears part (A1-A) of cooling load.

[0070] In the above implementation, in order to solve the problem of the demand for cold and heat in the low-temperature dehumidification section and the reheating section of the fresh air unit, two heat exchangers are set in the fresh air unit, which are connected with the compressor, throttle valve and other components to form an independent air conditioning system, one of which is an evaporator in the air conditioning system, which plays a role in low-temperature dehumidification of the fresh air, and the other heat exchanger is used as a condenser in the air conditioning system to heat the low-temperature and low-humidity air again to the set outlet temperature. Through the evaporator and condenser of the air conditioning system, the heat required to process the air is taken away and supplemented by the phase change heat absorption and heat release process of the refrigerant in the refrigeration cycle, and the cold and heat between the low-temperature dehumidification section and the reheating section in the fresh air unit are reasonably transferred and utilized, reducing the energy loss and waste of the air conditioning system in the traditional fresh air unit, reducing the energy consumption of fresh air processing, reducing the installed capacity of the external cold and heat source of the fresh air unit, saving the investment in the host equipment of the fresh air unit, and improving the energy efficiency of the fresh air unit on the basis of ensuring the reliability of the fresh air unit.

[0071] Example 3

[0072] Based on the fresh air unit provided in the above embodiment 1, a factory cleaning system is further provided in a preferred embodiment 3 of the present invention. The factory cleaning system includes the fresh air unit as described above, and the fresh air unit is used for air cleaning.

[0073] In the above embodiment, a fresh air unit is provided. To solve the problem of the demand for cold and heat in the low-temperature dehumidification section and the reheating section of the fresh air unit, two heat exchangers are arranged in the fresh air unit, which are connected with the compressor, throttle valve and other components to form an independent air conditioning system, wherein one heat exchanger is an evaporator in the air conditioning system, which plays a role in low-temperature dehumidification of the fresh air, and the other heat exchanger is a condenser in the air conditioning system, which reheats the low-temperature and low-humidity air to the set outlet temperature. Through the evaporator and condenser of the air conditioning system, the heat required for processing the air is taken away and supplemented by the phase change heat absorption and heat release process of the refrigerant in the refrigeration cycle, and the cold and heat between the low-temperature dehumidification section and the reheating section in the fresh air unit are reasonably transferred and utilized, thereby reducing the energy loss and waste of the air conditioning system in the traditional fresh air unit, reducing the energy consumption of fresh air processing, reducing the installed capacity of the external cold and heat source of the fresh air unit, saving the investment in the host equipment of the fresh air unit, and improving the energy efficiency of the fresh air unit on the basis of ensuring the reliability of the fresh air unit.

[0074] Example 4

[0075] Based on the fresh air unit control method provided in the above-mentioned embodiment 2, a storage medium containing computer executable instructions is also provided in a preferred embodiment 4 of the present invention. When the computer executable instructions are executed by a computer processor, they are used to execute the fresh air unit control method as described above.

[0076] In the above embodiment, a fresh air unit is provided. To solve the problem of the demand for cold and heat in the low-temperature dehumidification section and the reheating section of the fresh air unit, two heat exchangers are arranged in the fresh air unit, which are connected with the compressor, throttle valve and other components to form an independent air conditioning system, wherein one heat exchanger is an evaporator in the air conditioning system, which plays a role in low-temperature dehumidification of the fresh air, and the other heat exchanger is a condenser in the air conditioning system, which reheats the low-temperature and low-humidity air to the set outlet temperature. Through the evaporator and condenser of the air conditioning system, the heat required for processing the air is taken away and supplemented by the phase change heat absorption and heat release process of the refrigerant in the refrigeration cycle, and the cold and heat between the low-temperature dehumidification section and the reheating section in the fresh air unit are reasonably transferred and utilized, thereby reducing the energy loss and waste of the air conditioning system in the traditional fresh air unit, reducing the energy consumption of fresh air processing, reducing the installed capacity of the external cold and heat source of the fresh air unit, saving the investment in the host equipment of the fresh air unit, and improving the energy efficiency of the fresh air unit on the basis of ensuring the reliability of the fresh air unit.

[0077] The serial numbers of the above embodiments of the present invention are only for description and do not represent the advantages or disadvantages of the embodiments.

[0078] In the above embodiments of the present invention, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0079] In the several embodiments provided in this application, it should be understood that the disclosed technical content can be implemented in other ways. Among them, the device embodiments described above are only schematic. For example, the division of the units can be a logical function division. There may be other division methods in actual implementation. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of units or modules, which can be electrical or other forms.

[0080] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple units. Some or all of the units may be selected according to actual needs to achieve the purpose of the present embodiment.

[0081] In addition, each functional unit in each embodiment of the present invention may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above-mentioned integrated unit may be implemented in the form of hardware or in the form of software functional units.

[0082] If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art, or all or part of the technical solution can be embodied in the form of a software product, and the computer software product is stored in a storage medium, including a number of instructions for a computer device (which can be a personal computer, a server or a network device, etc.) to perform all or part of the steps of the method described in each embodiment of the present invention. The aforementioned storage medium includes: U disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), mobile hard disk, magnetic disk or optical disk and other media that can store program codes.

[0083] Those skilled in the art will readily appreciate other embodiments of the present invention after considering the specification and practicing the invention disclosed herein. This application is intended to cover any variations, uses or adaptations of the present invention that follow the general principles of the present invention and include common knowledge or customary techniques in the art that are not invented by the present invention. The specification and examples are to be considered exemplary only, and the true scope and spirit of the present invention are indicated by the following claims.

[0084] It should be understood that the present invention is not limited to the exact construction that has been described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the present invention is limited only by the appended claims.

Claims

1. A fresh air unit, characterized in that: include: Surface cooling section, used for low-temperature dehumidification of air; The reheat section is used to heat the air; The energy supply system comprises an evaporator and a condenser of an air conditioning system, wherein the evaporator is arranged in the surface cooling section to provide cooling capacity for the surface cooling section, and the condenser is arranged in the reheating section to provide heat for the reheating section.

2. The fresh air unit according to claim 1, characterized in that: The evaporator and the condenser are both three-medium heat exchangers, which include: an outer tube, an inner tube and fins. The fluid in the outer tube is a first fluid, the fluid in the inner tube is a second fluid, and the fluid at the fins is air; wherein the second fluid is a refrigerant.

3. The fresh air unit according to claim 1, characterized in that: The energy supply system further comprises: A low-temperature cooling water pipe is located in the surface cooling section and is used to pass external low-temperature cooling water into the surface cooling section when the cooling capacity provided by the air-conditioning system is insufficient, so as to provide cooling capacity for the surface cooling section; The hot water pipe is located in the reheat section and is used to pass external hot water into the reheat section when the heat provided by the air conditioning system is insufficient, so as to provide heat for the surface cooling section.

4. A fresh air unit control method, applied to the fresh air unit according to any one of claims 1 to 3, characterized in that: The method comprises: Detecting the cooling capacity required by the surface cooling section and the heat capacity required by the reheating section of the fresh air unit; Determine the relationship between the cooling capacity required by the surface cooling section and the heat capacity required by the reheating section; The operation of the energy supply system is controlled according to the relationship between the cooling capacity required by the surface cooling section and the heat capacity required by the reheating section.

5. The method according to claim 4, characterized in that Controlling the operation of the energy supply system according to the relationship between the cooling capacity required by the surface cooling section and the heat capacity required by the reheating section includes: Adjusting the operating parameters of the energy supply system so that the energy supply system preferentially meets the smaller of the cooling capacity required by the surface cooling section and the heat capacity required by the reheating section; After the smaller of the cooling capacity required by the surface cooling section and the heat required by the reheating section is met, the operating parameters of the energy supply system are further adjusted so that the energy supply system meets the larger of the cooling capacity required by the surface cooling section and the heat required by the reheating section.

6. The method according to claim 5, characterized in that Adjusting the operating parameters of the energy supply system so that the energy supply system preferentially meets the smaller of the cooling capacity required by the surface cooling section and the heat capacity required by the reheating section, including: When the cooling capacity required by the surface cooling section is less than or equal to the heat required by the reheat section, determining whether the rated cooling capacity of the evaporator of the air-conditioning system is greater than or equal to the cooling capacity required by the surface cooling section; If yes, adjusting the operating frequency of the compressor of the air conditioning system so that the current cooling capacity of the evaporator reaches the cooling capacity required by the surface cooling section; Otherwise, the compressor of the air-conditioning system is controlled to the maximum operating frequency to provide the rated cooling capacity, and the low-temperature cooling water pipe of the energy supply system is controlled to open, and the water flow of the low-temperature cooling water pipe is adjusted until the cooling capacity provided by the energy supply system meets the cooling capacity required by the surface cooling section.

7. The method according to claim 5, characterized in that Adjusting the operating parameters of the energy supply system so that the energy supply system preferentially meets the smaller of the cooling capacity required by the surface cooling section and the heat capacity required by the reheating section, including: When the cooling capacity required by the surface cooling section is greater than the heat required by the reheating section, determining whether the rated heating capacity of the condenser of the air-conditioning system is greater than or equal to the heat required by the reheating section; If yes, adjusting the operating frequency of the compressor of the air conditioning system so that the current heat supply of the condenser reaches the heat required by the reheating section; Otherwise, the compressor of the air-conditioning system is controlled to the maximum operating frequency to provide the rated heating capacity, and the warm water pipe of the energy supply system is controlled to open, and the water flow of the warm water pipe is adjusted until the heat provided by the energy supply system meets the heat required by the reheat section.

8. The method according to claim 6, characterized in that Further adjusting the operating parameters of the energy supply system so that the energy supply system meets the larger of the cooling capacity required by the surface cooling section and the heat capacity required by the reheating section, including: Determining whether the rated heating supply of the condenser of the air conditioning system is equal to the heat required by the reheat section or is less than the heat required by the reheat section; When the rated heat supply is equal to the heat required by the reheating section, maintaining the current operating parameters of the energy supply system; When the rated heating amount is less than the heat required by the reheating section, the warm water pipe of the energy supply system is controlled to open, and the water flow of the warm water pipe is adjusted until the heat provided by the energy supply system meets the heat required by the reheating section.

9. The method according to claim 7, characterized in that: Further adjusting the operating parameters of the energy supply system so that the energy supply system meets the larger of the cooling capacity required by the surface cooling section and the heat capacity required by the reheating section, including: Determine whether the rated cooling capacity of the evaporator of the air conditioning system is equal to the cooling capacity required by the surface cooling section or is less than the cooling capacity required by the surface cooling section; When the rated cooling capacity is equal to the cooling capacity required by the surface cooling section, maintaining the current operating parameters of the energy supply system; When the rated cooling capacity is less than the cooling capacity required by the surface cooling section, the low-temperature cooling pipe of the energy supply system is controlled to open, and the water flow of the low-temperature cooling pipe is adjusted until the cooling capacity provided by the energy supply system meets the cooling capacity required by the surface cooling section.

10. A factory cleaning system, characterized in that: The plant clean system includes the fresh air unit as described in any one of claims 1 to 3.

11. A storage medium containing computer executable instructions, characterized in that: The computer executable instructions are used to execute the fresh air unit control method as described in any one of claims 4 to 9 when executed by a computer processor.

Images