CN115540053A - Heat recovery unit and control method thereof - Google Patents
Heat recovery unit and control method thereof Download PDFInfo
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- CN115540053A CN115540053A CN202211171047.5A CN202211171047A CN115540053A CN 115540053 A CN115540053 A CN 115540053A CN 202211171047 A CN202211171047 A CN 202211171047A CN 115540053 A CN115540053 A CN 115540053A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F1/00—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station
- F24F1/0007—Indoor units, e.g. fan coil units
- F24F1/0011—Indoor units, e.g. fan coil units characterised by air outlets
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F1/00—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station
- F24F1/0007—Indoor units, e.g. fan coil units
- F24F1/0059—Indoor units, e.g. fan coil units characterised by heat exchangers
- F24F1/0063—Indoor units, e.g. fan coil units characterised by heat exchangers by the mounting or arrangement of the heat exchangers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F1/00—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station
- F24F1/0007—Indoor units, e.g. fan coil units
- F24F1/0087—Indoor units, e.g. fan coil units with humidification means
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F1/00—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station
- F24F1/0007—Indoor units, e.g. fan coil units
- F24F1/009—Indoor units, e.g. fan coil units characterised by heating arrangements
- F24F1/0093—Indoor units, e.g. fan coil units characterised by heating arrangements with additional radiant heat-discharging elements, e.g. electric heaters
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
- F24F11/63—Electronic processing
- F24F11/64—Electronic processing using pre-stored data
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
- F24F11/72—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure
- F24F11/74—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure for controlling air flow rate or air velocity
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F12/00—Use of energy recovery systems in air conditioning, ventilation or screening
- F24F12/001—Use of energy recovery systems in air conditioning, ventilation or screening with heat-exchange between supplied and exhausted air
- F24F12/006—Use of energy recovery systems in air conditioning, ventilation or screening with heat-exchange between supplied and exhausted air using an air-to-air heat exchanger
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
- F24F13/30—Arrangement or mounting of heat-exchangers
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/56—Heat recovery units
Abstract
The invention provides a heat recovery unit and a control method thereof. This heat recovery unit includes: the fresh air unit (1) is provided with a fresh air outlet; the air supply assembly comprises a heat recovery device (2), wherein the heat recovery device (2) comprises a precooling section (3) and a surface cooler (4) which are sequentially arranged along the air supply direction, the precooling section (3) is arranged at a fresh air outlet, cooling liquid in the surface cooler (4) and air enter the precooling section (3) after heat exchange, and the air flowing through the precooling section (3) is precooled. According to the heat recovery unit, the energy utilization efficiency of the heat recovery unit can be improved, and the energy consumption can be greatly reduced.
Description
Technical Field
The invention relates to the technical field of air conditioning systems, in particular to a heat recovery unit and a control method thereof.
Background
The air handling unit for the data center ventilation air conditioning system mainly meets the requirements of ambient temperature and humidity in a main control room of the data center, guarantees the ambient conditions such as temperature and humidity required by equipment operation in the main control room, and meets the requirement of comfort of main control room workers on the environment. Increase the mode of electrical heating behind the surface cooler and reduce air supply relative humidity on the market generally, reach the humiture requirement of human travelling comfort requirement and environment, on the one hand the absorptive heat of surface cooler is wasted by vain, and on the other hand, electrical heating can additionally consume the electric energy, consequently greatly increased energy resource consumption.
Disclosure of Invention
The invention mainly aims to provide a heat recovery unit and a control method thereof, which can improve the energy utilization efficiency of the heat recovery unit and greatly reduce the energy consumption.
To achieve the above object, according to an aspect of the present invention, there is provided a heat recovery unit including:
the fresh air unit is provided with a fresh air outlet;
the air supply assembly comprises a heat recovery device, the heat recovery device comprises a pre-cooling section and a surface air cooler which are sequentially arranged along the air supply direction, the pre-cooling section is arranged at a fresh air outlet, cooling liquid in the surface air cooler enters the pre-cooling section after heat exchange with air, and pre-cooling is carried out on the air flowing through the pre-cooling section.
Furthermore, the heat recovery device also comprises a reheating section, the reheating section is positioned at the downstream of the air supply direction of the surface cooler, and the cooling liquid in the pre-cooling section enters the reheating section after heat exchange with air so as to heat the air flowing through the reheating section.
Furthermore, the heat recovery device also comprises a cooling unit, and cooling liquid in the cooling unit flows through the surface air cooler, the pre-cooling section and the reheating section in sequence and then flows back to the cooling unit.
Furthermore, the heat recovery device also comprises a cooling unit and a water pump, the cooling unit forms a circulation loop with the surface cooler through a liquid inlet pipe and a liquid return pipe, a bypass pipeline is arranged on the liquid return pipe, the bypass pipeline is connected with the cooling unit after being sequentially connected with the pre-cooling section and the reheating section, the liquid return pipe is selectively communicated with the bypass pipeline or the cooling unit, and the water pump provides power for the flow of the cooling liquid.
Furthermore, a liquid return pipe, a bypass pipeline and the cooling unit are connected through a three-way valve, and a flow regulating valve is arranged on the liquid return pipe.
Further, the air supply assembly also comprises a hot water coil which is positioned at the downstream of the air supply direction of the heat recovery device.
Further, the air supply assembly further comprises an electric heater, and the electric heater is positioned at the downstream of the air supply direction of the heat recovery device.
Further, the air supply assembly further comprises a humidifier, and the humidifier is located at the downstream of the air supply direction of the heat recovery device.
Furthermore, the air supply assembly further comprises a hot water coil, an electric heater and a humidifier, and the hot water coil, the electric heater and the humidifier are sequentially arranged on the downstream side of the heat recovery device along the air supply direction.
Furthermore, the fresh air unit comprises a heat recovery section, and fresh air is blown out from a fresh air outlet after exchanging heat with return air in the heat recovery section.
According to another aspect of the present invention, there is provided a control method for the heat recovery unit, including:
acquiring a current air outlet temperature Tsend and a target air outlet temperature T set;
acquiring current air outlet moisture content d delivery and target air outlet moisture content d setting;
comparing the current outlet air temperature T with the target outlet air temperature T, and the current outlet air moisture content d with the target outlet air moisture content d;
and adjusting the heat recovery device according to the comparison result.
Further, the step of adjusting the heat recovery device according to the comparison result includes:
detecting a difference value between the current outlet air moisture content d and the target outlet air moisture content d;
when | d is sent to d and | is less than or equal to a, the flow regulating valve is kept not to act;
and when | d is sent to d and | a is set, controlling the opening of the flow regulating valve according to the current outlet air moisture content d and the target outlet air moisture content d by a PID algorithm.
Further, the step of adjusting the heat recovery device according to the comparison result includes:
detecting a difference value between the current air outlet temperature tSend and the target air outlet temperature T;
when | T is sent to-T and | is less than or equal to b, the three-way valve is kept to be inactive;
and when the absolute value T is sent to the T and is set to be absolute value > b, the opening degree of the three-way valve is controlled according to the current air outlet temperature T and the target air outlet temperature T.
Further, when | T send-T sets | b, the step of controlling the opening of the three-way valve by the PID algorithm according to the current outlet air temperature T send and the target outlet air temperature T set includes:
when T is greater than T and + b is set, reducing the bypass opening of the three-way valve until the condition that T is greater than T and T is set to be less than or equal to b is met;
when T is less than T and is equal to-b, the bypass opening degree of the three-way valve is increased;
detecting whether T is less than T and-b is less than T, and if so, detecting whether the opening of the bypass reaches 100%;
if the opening degree reaches 100%, starting electrical heating until the condition that the absolute value T is sent to the position-T and the absolute value is less than or equal to b is met;
and if the opening degree does not reach 100%, continuously increasing the bypass opening degree of the three-way valve.
By applying the technical scheme of the invention, the heat recovery unit comprises: the fresh air unit is provided with a fresh air outlet; the air supply assembly comprises a heat recovery device, the heat recovery device comprises a precooling section and a surface cooler which are sequentially arranged along the air supply direction, the precooling section is arranged at a fresh air outlet, and cooling liquid in the surface cooler enters the precooling section after being subjected to heat exchange with air to precool the air flowing through the precooling section. This heat recovery unit's air supply subassembly includes heat recovery unit, heat recovery unit utilizes the surface cooler to cool down the dehumidification to the air, the humidity of conditioned air, coolant liquid after the surface cooler heat transfer is carried out the reuse through the precooling section, carry out the precooling to the air that is located the air supply direction upstream side of surface cooler, reduce the load of surface cooler processing air in-process, the cold volume of coolant liquid after the fully utilized surface cooler cools down the dehumidification, effectively improve heat recovery unit's energy utilization efficiency, reduce energy consumption by a wide margin.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:
FIG. 1 shows a schematic structural diagram of a heat recovery unit of an embodiment of the present invention; and
fig. 2 shows a control schematic of a heat recovery unit of an embodiment of the invention.
Wherein the figures include the following reference numerals:
1. a fresh air handling unit; 2. a heat recovery device; 3. a pre-cooling section; 4. a surface cooler; 5. a reheating section; 6. a cooling unit; 7. a liquid return pipe; 8. a bypass line; 9. a three-way valve; 10. a flow regulating valve; 11. a hot water coil; 12. an electric heater; 13. a humidifier; 14. a heat recovery section; 15. a water pump; 16. an air supply device; 17. a liquid inlet pipe.
Detailed Description
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present invention will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.
Referring to fig. 1, according to an embodiment of the present invention, a heat recovery unit includes: the fresh air unit 1 is provided with a fresh air outlet; the air supply assembly comprises a heat recovery device 2, wherein the heat recovery device 2 comprises a precooling section 3 and a surface cooler 4 which are sequentially arranged along the air supply direction, the precooling section 3 is arranged at a fresh air outlet, cooling liquid in the surface cooler 4 and air enter the precooling section 3 after heat exchange, and the air flowing through the precooling section 3 is precooled.
This heat recovery unit's air supply subassembly includes heat recovery unit 2, heat recovery unit 2 utilizes surface cooler 4 to cool down the dehumidification to the air, the humidity of air conditioning, coolant liquid after 3 pairs of surface cooler 4 heat exchanges of precooling section carries out reuse, carry out the precooling to the air that is located surface cooler 4's air supply direction upstream side, reduce the load of surface cooler 4 processing air in-process, the cold volume of coolant liquid after the fully utilized surface cooler 4 cools down the dehumidification to the air, effectively improve heat recovery unit's energy utilization efficiency, reduce energy resource consumption by a wide margin.
In one embodiment, the heat recovery device 2 further comprises a reheating section 5, the reheating section 5 is located at the downstream of the air supply direction of the surface cooler 4, and the cooling liquid in the precooling section 3 enters the reheating section 5 after being subjected to heat exchange with the air, so that the air flowing through the reheating section 5 is heated.
In this embodiment, the heat recovery device 2 further includes a reheating section 5, the reheating section 5 is connected in series with the precooling section 3, so that the precooling section 3 exchanges heat with fresh air and absorbs heat of the fresh air, the cooling liquid absorbing heat can flow to the reheating section 5, and a cooling liquid with a temperature higher than the temperature of the air cooled and dehumidified by the surface air cooler 4 is formed at the reheating section 5, thereby the air which is located at the downstream side of the surface air cooler 4 and cooled and dehumidified by the surface air cooler 4 can be heated by the heat absorbed by the cooling liquid at the precooling section 3, because the cooling capacity of the cooling liquid in the precooling section 3 for precooling the air comes from the cooling capacity of the cooling liquid after heat exchange of the surface air cooler 4, and the heat capacity of the cooling liquid in the reheating section 5 for reheating the air comes from the fresh air for heat exchange, the energy of the cooling liquid and the energy contained in the air can be fully utilized, the cooling load of the surface air cooler 4 in the air treatment process is reduced, and the sensible heat load of the heater for heating the treated air is reduced, and the sensible heat of the treated air is reduced, and the energy-saving of the conventional energy-saving heater is greatly reduced.
The pre-cooling section 3 and the reheating section 5 are distributed on the upstream side and the downstream side of the surface cooler 4 and are connected through pipelines to form a horseshoe-shaped heat exchange pipe, or an integral horseshoe-shaped heat pipe is adopted, and the energy transmission is realized by utilizing the self characteristics of the heat pipe.
In one embodiment, the heat recovery device 2 further comprises a cooling unit 6 and a water pump 15, wherein the cooling liquid in the cooling unit 6 flows through the surface air cooler 4, the pre-cooling section 3 and the reheating section 5 in sequence and then flows back to the cooling unit 6, and the water pump 15 provides power for the flow of the cooling liquid.
In this embodiment, the cooling unit 6 is connected to the pre-cooling section 3, the surface air cooler 4 and the reheating section 5 in sequence, and the water pump 15 may be disposed at an outlet end of the cooling unit 6 to drive the cooling liquid to flow circularly. In the process of circulating flow of the cooling liquid, firstly, the air is cooled and dehumidified at the surface air cooler 4, then, the air flows to the pre-cooling section 3 to pre-cool the air on the upstream side of the surface air cooler 4 by using the residual cooling of the cooling liquid, and after the fresh air heat at the fresh air outlet is absorbed and the temperature is raised, the air flows to the reheating section 5 on the downstream side of the surface air cooler 4 to exchange heat with the air on the downstream side of the surface air cooler 4, and the air is heated. The cooling liquid circulation formed by the cooling unit 6, the pre-cooling section 3, the surface air cooler 4 and the reheating section 5 in the embodiment is a single circulation structure, and the temperature and the humidity of air can be adjusted by adjusting a flow adjusting valve 10 on a pipeline.
In one embodiment, the heat recovery device 2 further comprises a cooling unit 6, the cooling unit 6 forms a circulation loop with the surface cooler 4 through a liquid inlet pipe 17 and a liquid return pipe 7, a bypass pipeline 8 is arranged on the liquid return pipe 7, the bypass pipeline 8 is connected to the cooling unit 6 after being sequentially connected with the pre-cooling section 3 and the reheating section 5, and the liquid return pipe 7 is selectively communicated with the bypass pipeline 8 or the cooling unit 6.
The liquid return pipe 7, the bypass pipeline 8 and the cooling unit 6 are connected through a three-way valve 9, and the liquid return pipe 7 is provided with a flow regulating valve 10.
In this embodiment, the flow rate distributed to the bypass line 8 can be adjusted by the three-way valve 9, so as to adjust the temperature of the air, and the flow rate of the coolant flowing out of the surface air cooler 4 can be adjusted by the flow rate adjusting valve 10, so as to adjust the heat exchange time of the coolant in the surface air cooler 4, adjust the surface temperature of the surface air cooler 4, and achieve the purpose of adjusting the air humidity.
The process of adjusting the air temperature using the three-way valve 9 is as follows: when the bypass opening of the three-way valve 9 is reduced, the amount of the cooling liquid entering the pre-cooling section 3 is reduced, the amount of the cooling liquid exchanging heat with the air is reduced, and the amount of the heat of the air which can be absorbed is reduced, so that the amount of the cooling liquid entering the reheating section 5 is reduced, and the heating amount of the air cooled and dehumidified by the surface air cooler 4 is reduced, so that the temperature of the air after heat exchange by the reheating section 5 can be reduced; when the bypass opening of the three-way valve 9 is increased, the amount of the cooling liquid entering the pre-cooling section 3 is increased, the amount of the cooling liquid exchanging heat with the air is increased, and the amount of the air heat that can be absorbed is increased, so that the amount of the cooling liquid entering the reheating section 5 is increased, and the amount of the air heated after being cooled and dehumidified by the surface air cooler 4 is increased, so that the temperature of the air after being heat-exchanged by the reheating section 5 can be increased.
Through the joint adjustment of the three-way valve 9 and the flow regulating valve 10, the indoor distribution temperature and the indoor air supply humidity can be accurately controlled, and therefore the constant temperature and humidity of the indoor environment can be effectively guaranteed.
In one embodiment, the air supply assembly further comprises a hot water coil 11, the hot water coil 11 being located downstream in the air supply direction of the heat recovery device 2. The hot water coil 11 can heat the air flowing through, so as to adjust the air outlet temperature of the air.
In one embodiment, the air supply assembly further comprises an electric heater 12, the electric heater 12 being located downstream in the air supply direction of the heat recovery device 2. The electric heater 12 can heat the air flowing through, so as to adjust the outlet air temperature of the air.
In one embodiment, the air supply assembly further comprises a humidifier 13, the humidifier 13 being located downstream of the heat recovery device 2 in the air supply direction. The humidifier 13 is, for example, an electrode humidifier. The humidifier 13 is used for indoor humidification in winter, and is used to increase the moisture content of air when the air passes through.
In one embodiment, the air supply assembly further includes a hot water coil 11, an electric heater 12, and a humidifier 13, and the hot water coil 11, the electric heater 12, and the humidifier 13 are sequentially disposed on a downstream side of the heat recovery device 2 in the air supply direction. The air supply assembly further comprises an air supply device 16 positioned at the air supply outlet, and the air supply device 16 comprises a fan and can provide air supply power.
In one embodiment, the fresh air handling unit 1 includes a heat recovery section 14, and fresh air is blown out from a fresh air outlet after the heat recovery section 14 exchanges heat with return air.
The fresh air is in the return air at the heat recovery section 14 for heat exchange, and the cold quantity of the return air can be fully absorbed, so that the cold load when the surface air cooler processes the air is further reduced, and the utilization efficiency of the energy is improved.
The coolant may be, for example, water, or another coolant, for example, ethanol.
According to the heat recovery unit provided by the embodiment of the invention, a three-way valve 9 is additionally arranged on a liquid return pipe 7 to bypass a part of cold water to a heat recovery device 2, when the temperature of outdoor damp and hot fresh air is T1 after passing through a plate-fin heat exchanger in the fresh air unit 1, the relative humidity is H1, the calculated moisture content is d1, the temperature of the outdoor damp and hot fresh air is T2 after passing through a precooling section 3 of a horseshoe-shaped heat pipe, the calculated moisture content is d2, the water in the precooling section 3 of the horseshoe-shaped heat pipe evaporates and absorbs heat, the heat is taken away from a connecting section to a reheating section 5 along a loop, the cold energy is transferred, the damp and hot fresh air is changed into precooled air, the air is dehumidified and cooled again by a surface cooler 4, the temperature is T3, the relative humidity is H3, the calculated moisture content is d3, the heated by the reheating section 5 of the horseshoe-shaped heat pipe after passing through the surface cooler is T4, the relative humidity is H4, the calculated moisture content is d by the surface cooler 4, the reheating section 5, comfortable temperature and humidity are delivered into the indoor. The horseshoe-shaped heat pipe formed by the invention can be used in an air conditioning system, is used for improving the dehumidification effect of a surface air cooler, and plays a role in energy conservation.
Referring to fig. 2 in combination, according to an embodiment of the present invention, a control method of a heat recovery unit includes: acquiring a current air outlet temperature tAN _ SN and a target air outlet temperature T; acquiring a current air outlet moisture content d and a target air outlet moisture content d; comparing the current outlet air temperature T with the target outlet air temperature T, and the current outlet air moisture content d with the target outlet air moisture content d; the heat recovery device 2 is adjusted according to the comparison result.
In one embodiment, the step of adjusting the heat recovery device 2 in dependence on the comparison comprises: detecting a difference value between the current outlet air moisture content d and the target outlet air moisture content d; when | d is sent to d and | is less than or equal to a, the flow regulating valve is kept not to act; and when | d is sent to d and | a is set, controlling the opening of the flow regulating valve according to the current outlet air moisture content d and the target outlet air moisture content d by a PID algorithm.
In one embodiment, the step of adjusting the heat recovery device 2 in dependence on the comparison comprises: detecting a difference value between the current air outlet temperature tSend and the target air outlet temperature T; when | T is sent to-T and | is less than or equal to b, the three-way valve 9 is kept not to act; and when the absolute value T is sent to the T and is set to be absolute value > b, the opening degree of the three-way valve 9 is controlled according to the current air outlet temperature T and the target air outlet temperature T.
In one embodiment, when | T send-T sets | > b, the step of controlling the opening of the three-way valve 9 by the PID algorithm according to the current outlet air temperature tput and the target outlet air temperature T includes: when T is greater than T and + b is set, reducing the bypass opening of the three-way valve 9 until the condition that | T is sent-T and | < b is satisfied; when T is less than T and is equal to-b, the bypass opening degree of the three-way valve 9 is increased; detecting whether T is less than T and-b is less than T, and if so, detecting whether the opening of the bypass reaches 100%;
if the opening degree reaches 100%, starting electrical heating until the condition that T is sent to T and b is less than or equal to is met; if the opening degree does not reach 100%, the bypass opening degree of the three-way valve 9 is continuously increased.
In the above-mentioned examples, a is, for example, 0.5g/kg, and b is, for example, 1 ℃.
In the control method of this embodiment, the target of the regulation is the air supply temperature and the air supply moisture content, which are equal to the set values, the set temperature return difference value is 1 ℃, and the set moisture content return difference value is 0.5g/kg, that is, if the air supply moisture content and the set value difference value are ± 0.5g/kg, the flow regulating valve 10 keeps the opening degree unchanged, and if the air supply temperature and the set value difference value are ± 1 ℃, the bypass opening degree of the three-way valve 9 keeps unchanged.
When the detection is continuously carried out for 10S, d is sent to d and is set to be less than or equal to 0.5, the flow regulating valve 10 does not act; otherwise, the opening degree of the flow regulating valve 10 is controlled through a PID algorithm according to the target air supply moisture content and the current air supply moisture content, wherein the target air supply moisture content is a target moisture content value, the feedback temperature is a real-time moisture content value, and parameters P, ti and Td in the PID control block can be set. When the detected air supply temperature Tsend is continuously 10S and is greater than the set temperature Tset +1, the bypass opening of the three-way valve 9 is reduced, the water flow is reduced, the cold water flowing into the pre-cooling section 3 and the reheating section 5 is reduced, the heat exchange quantity is reduced, the Tsend is reduced until the absolute value of Tsend-T is less than or equal to 1, and the bypass opening of the three-way valve 9 is kept unchanged; and vice versa. When the bypass opening of the three-way valve 9 reaches 100% and still does not meet the requirement, the electric heater 12 can be turned on to meet the requirement.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
It should be noted that the terms "first," "second," and the like in the description and claims of this application and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the application described herein are capable of operation in sequences other than those illustrated or described herein.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A heat recovery unit, comprising:
the fresh air unit (1) is provided with a fresh air outlet;
the air supply assembly comprises a heat recovery device (2), wherein the heat recovery device (2) comprises a precooling section (3) and a surface air cooler (4) which are sequentially arranged along the air supply direction, the precooling section (3) is arranged at a fresh air outlet, and cooling liquid in the surface air cooler (4) enters the precooling section (3) after being subjected to heat exchange with air and precools the air flowing through the precooling section (3).
2. The heat recovery unit according to claim 1, wherein the heat recovery device (2) further comprises a reheating section (5), the reheating section (5) is located downstream of the air supply direction of the surface air cooler (4), and the cooling liquid in the pre-cooling section (3) enters the reheating section (5) after exchanging heat with air to heat the air flowing through the reheating section (5).
3. The heat recovery unit according to claim 2, wherein the heat recovery device (2) further comprises a cooling unit (6) and a water pump (15), the cooling liquid in the cooling unit (6) flows through the surface air cooler (4), the pre-cooling section (3) and the reheating section (5) in sequence and then flows back to the cooling unit (6), and the water pump (15) provides power for the flow of the cooling liquid.
4. The heat recovery unit according to claim 2, wherein the heat recovery device (2) further comprises a cooling unit (6), the cooling unit (6) forms a circulation loop with the surface cooler (4) through a liquid inlet pipe (17) and a liquid return pipe (7), a bypass pipeline (8) is arranged on the liquid return pipe (7), the bypass pipeline (8) is connected to the cooling unit (6) after sequentially connecting the pre-cooling section (3) and the reheating section (5), and the liquid return pipe (7) is selectively communicated with the bypass pipeline (8) or the cooling unit (6).
5. The heat recovery unit according to claim 4, characterized in that the liquid return pipe (7), the bypass line (8) and the cooling unit (6) are connected by a three-way valve (9), and a flow regulating valve (10) is arranged on the liquid return pipe (7).
6. The heat recovery unit according to claim 1, characterized in that the air supply assembly further comprises a hot water coil (11), the hot water coil (11) being located downstream of the air supply direction of the heat recovery device (2).
7. A method of controlling a heat recovery unit according to any one of claims 1 to 6, comprising:
acquiring a current air outlet temperature tAN _ SN and a target air outlet temperature T;
acquiring a current air outlet moisture content d and a target air outlet moisture content d;
comparing the current outlet air temperature T with the target outlet air temperature T, and the current outlet air moisture content d with the target outlet air moisture content d;
the heat recovery device (2) is adjusted according to the comparison result.
8. The control method of a heat recovery unit according to claim 7, characterized in that the step of adjusting the heat recovery device (2) according to the comparison comprises:
detecting a difference value between the current outlet air moisture content d and the target outlet air moisture content d;
when | d is sent to d and | is less than or equal to a, the flow regulating valve is kept not to act;
and when | d is sent to d and | is more than a, controlling the opening of the flow regulating valve by a PID algorithm according to the current outlet air moisture content d and the target outlet air moisture content d.
9. The control method of a heat recovery unit according to claim 7, characterized in that the step of adjusting the heat recovery device (2) according to the comparison comprises:
detecting a difference value between the current air outlet temperature tSend and the target air outlet temperature T;
when the absolute value of T is sent to T and the absolute value is less than or equal to b, the three-way valve (9) is kept not to act;
when the absolute value of T is greater than b, the opening degree of a three-way valve (9) is controlled according to the current air outlet temperature T and the target air outlet temperature T.
10. The method for controlling the heat recovery unit according to claim 9, wherein when | T send-T is set to | > b, the step of controlling the opening of the three-way valve (9) according to the current outlet air temperature Tsend and the target outlet air temperature T through a PID algorithm comprises:
when T is greater than T and + b is set, reducing the bypass opening of the three-way valve (9) until the condition that | T is sent to-T and | is less than or equal to b is met;
when T is less than T and is equal to-b, the bypass opening degree of the three-way valve (9) is increased;
detecting whether T is less than T and-b is less than T, and if so, detecting whether the opening of the bypass reaches 100%;
if the opening degree reaches 100%, starting electrical heating until the condition that the absolute value T is sent to the position-T and the absolute value is less than or equal to b is met;
if the opening degree does not reach 100%, the bypass opening degree of the three-way valve (9) is continuously increased.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211171047.5A CN115540053A (en) | 2022-09-22 | 2022-09-22 | Heat recovery unit and control method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211171047.5A CN115540053A (en) | 2022-09-22 | 2022-09-22 | Heat recovery unit and control method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115540053A true CN115540053A (en) | 2022-12-30 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211171047.5A Pending CN115540053A (en) | 2022-09-22 | 2022-09-22 | Heat recovery unit and control method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115540053A (en) |
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2022
- 2022-09-22 CN CN202211171047.5A patent/CN115540053A/en active Pending
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