Fresh air dehumidification energy-saving system based on waste heat recovery

Abstract

The invention discloses a fresh air dehumidification energy-saving system based on waste heat recovery, which comprises a waste heat recovery and fresh air purification all-in-one machine integrating a heat exchange function and fresh air power, and further comprises a heating chamber, fan walls and an air return duct, the waste heat recovery and fresh air purification all-in-one machine is arranged on an outer wall, and the fan walls are arranged in an arrayed manner; an inlet of the air return duct is connected with an indoor moisture removal area, an outlet of the air return duct is connected with an exhaust inlet of the waste heat recovery and fresh air purification all-in-one machine, an inlet of the waste heat recovery and fresh air purification all-in-one machine is connected with the outside, a fresh air outlet is connected with an inlet of the fan wall, and an outlet of the fan wall is connected with an inlet of the heating chamber. An outlet of the heating chamber is used for being connected with an indoor air supply area. The invention relates to the technical field of building heating, ventilation and air conditioning and energy-saving equipment, in particular to a fresh air dehumidification energy-saving system based on waste heat recovery, which has the following advantages: 1, the energy-saving effect is obvious; 2, the function integration level is high; and 3, the stability is high.

Description

Technical Field

[0001] The present invention relates to the technical field of building heating, ventilation and air conditioning and energy-saving equipment, and in particular to a fresh air dehumidification and energy-saving system based on waste heat recovery. Background Art

[0002] During building ventilation and dehumidification, traditional systems directly discharge moist indoor exhaust air outdoors. This requires reheating (in winter) or cooling (in summer) the incoming fresh air, resulting in high energy consumption for the air conditioning system. The heat (in winter) or cooling (in summer) carried by the exhaust air remains unused, resulting in wasted energy. Therefore, an energy-saving dehumidification solution that recycles exhaust air energy and pre-conditions the fresh air temperature is urgently needed. Summary of the Invention

[0003] In view of this, an embodiment of the present invention hopes to provide a fresh air dehumidification and energy-saving system based on waste heat recovery to solve or alleviate the technical problems existing in the prior art and at least provide a beneficial option.

[0004] The technical solution of the embodiment of the present invention is achieved as follows:

[0005] A fresh air dehumidification and energy-saving system based on waste heat recovery includes a waste heat recovery and fresh air purification integrated machine integrating heat exchange function and fresh air power, and also includes a heating chamber, a fan wall and a return air duct. The waste heat recovery and fresh air purification integrated machine is arranged on the outer wall, and the fan walls are arranged in an array. The inlet of the return air duct is connected to the indoor dehumidification area and the outlet is connected to the exhaust inlet of the waste heat recovery and fresh air purification integrated machine. The inlet of the waste heat recovery and fresh air purification integrated machine is connected to the outdoors and the fresh air outlet is connected to the inlet of the fan wall. The outlet of the fan wall is connected to the inlet of the heating chamber, and the outlet of the heating chamber is used to connect to the indoor air supply area.

[0006] Among them, during dehumidification, the indoor humid exhaust air enters the waste heat recovery fresh air purification integrated machine through the return air duct, and the outdoor fresh air enters the waste heat recovery fresh air purification integrated machine at the same time. The two exchange temperatures in the waste heat recovery fresh air purification integrated machine. After pre-adjusting the fresh air temperature, it is evenly distributed through the fan wall, and then fine-tuned through the heating chamber before being sent into the room. The exhaust air that has undergone temperature exchange is discharged to the outside by the waste heat recovery fresh air purification integrated machine.

[0007] Preferably, the waste heat recovery and fresh air purification integrated machine adopts a rotary full heat exchange core to achieve full heat exchange of sensible heat and latent heat, and can also adopt a plate heat exchange core to achieve sensible heat exchange.

[0008] Preferably, the fan wall adopts a multi-fan combination structure, and the multi-fan combination structure is configured to have adjustable air volume to achieve uniform distribution of fresh air.

[0009] Preferably, an air volume regulating valve is provided on the return air duct, and the air volume regulating valve is configured to adjust the exhaust air volume according to the indoor dehumidification demand.

[0010] Preferably, the heating chamber is configured to provide supplementary heat to the fresh air pre-conditioned by waste heat recovery in winter, and selectively turn off the supplementary heat function in summer to directly supply air.

[0011] Preferably, when the waste heat recovery and fresh air purification integrated machine adopts a rotary full heat exchange core, the rotary full heat exchange core simultaneously recovers the sensible heat and latent heat in the exhaust air to reduce the energy consumption of temperature and humidity regulation of the fresh air.

[0012] Preferably, when operating in winter, the waste heat recovery and fresh air purification integrated machine uses the heat in the exhaust air to heat the fresh air; when operating in summer, the waste heat recovery and fresh air purification integrated machine uses the coldness in the exhaust air to cool the fresh air.

[0013] Preferably, the fresh air and exhaust air in the waste heat recovery and fresh air purification integrated machine are subjected to temperature exchange in a countercurrent or cross-current manner to improve heat exchange efficiency.

[0014] Preferably, it also includes a temperature and humidity sensor, which is arranged in the indoor dehumidification area and the fresh air supply path, and is used to jointly control the air volume regulating valve of the return air duct, the air volume of the fan wall and the heating state of the heating chamber.

[0015] Preferably, the heating chamber, fan wall, return air duct and waste heat recovery and fresh air purification integrated machine work together to achieve energy-saving operation of the dehumidification process through temperature exchange and graded adjustment.

[0016] The embodiment of the present invention adopts the above technical solution, which has the following advantages:

[0017] 1. Significant energy saving: Recover the heat / cold of exhaust air, reduce the energy consumption of fresh air heating / cooling, and reduce the load of air conditioning system.

[0018] 2. Functional integration: Combining dehumidification with waste heat recovery, the system is compact and suitable for operation in all seasons.

[0019] 3. High stability: All components work together (fan wall air supply, return air duct air guidance, heating chamber temperature supplement), and the operation is reliable.

[0020] The above summary is for illustrative purposes only and is not intended to be limiting in any way. In addition to the illustrative aspects, embodiments and features described above, further aspects, embodiments and features of the present invention will be readily apparent by reference to the accompanying drawings and the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or technical descriptions. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0022] Figure 1 It is a structural diagram of the present invention;

[0023] Figure 2 A structural diagram of another perspective of the present invention;

[0024] Figure 3 It is a cross-sectional structural diagram of the present invention;

[0025] Figure 4 A cross-sectional structural diagram from another perspective of the present invention;

[0026] Figure 5 This is a system airflow path diagram of the present invention.

[0027] Figure numerals: 1. Heating chamber; 2. Fan wall; 3. Return air duct; 4. Waste heat recovery and fresh air purification integrated machine; 5. Exterior wall; 6. Indoor dehumidification area. DETAILED DESCRIPTION

[0028] Hereinafter, only certain exemplary embodiments are briefly described. As will be appreciated by those skilled in the art, the described embodiments may be modified in various ways without departing from the spirit or scope of the present invention. Therefore, the drawings and description are to be considered as illustrative in nature and not restrictive.

[0029] It should be noted that the terms "first," "second," "symmetrical," "array," etc. are used only to distinguish descriptions from positional descriptions and should not be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, limitations on features such as "first" and "symmetrical" may explicitly or implicitly include one or more of these features; similarly, when the number of certain features is not limited in the form of words such as "two" or "three," it should be noted that these features also explicitly or implicitly include one or more of the number of features.

[0030] In the present invention, unless otherwise expressly specified or limited, terms such as "installation," "connection," and "fixation" should be understood broadly; for example, they may refer to fixed connection, detachable connection, or integral molding; they may refer to mechanical connection, direct connection, welding, or indirect connection through an intermediate medium; they may refer to internal communication between two components or interaction between two components. Those skilled in the art will be able to understand the specific meanings of the above terms in the present invention based on the specification and drawings in conjunction with specific circumstances.

[0031] The embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0032] like Figure 1-5 The present invention provides a fresh air dehumidification and energy-saving system based on waste heat recovery, including a waste heat recovery and fresh air purification integrated machine 4 integrating heat exchange function and fresh air power, and also including a heating chamber 1, a fan wall 2 and a return air duct 3. The waste heat recovery and fresh air purification integrated machine 4 is arranged on the outer wall 5, and the fan walls 2 are arranged in an array. The inlet of the return air duct 3 is connected to the indoor dehumidification area 6 and the outlet is connected to the exhaust inlet of the waste heat recovery and fresh air purification integrated machine 4. The inlet of the waste heat recovery and fresh air purification integrated machine 4 is connected to the outdoors and the fresh air outlet is connected to the inlet of the fan wall 2. The outlet of the fan wall 2 is connected to the inlet of the heating chamber 1, and the outlet of the heating chamber 1 is used to connect to the indoor air supply area.

[0033] Among them, during dehumidification, the indoor humid exhaust air enters the waste heat recovery fresh air purification integrated machine 4 through the return air duct 3, and the outdoor fresh air enters the waste heat recovery fresh air purification integrated machine 4 at the same time. The two exchange temperatures in the waste heat recovery fresh air purification integrated machine 4. After pre-adjusting the fresh air temperature, it is evenly distributed through the fan wall 2, and then fine-tuned through the heating chamber 1 before being sent into the room. The exhaust air that has undergone temperature exchange is discharged to the outside by the waste heat recovery fresh air purification integrated machine 4.

[0034] In this embodiment, specifically, the waste heat recovery and fresh air purification integrated machine 4 adopts a rotary full heat exchange core to achieve full heat exchange of sensible heat and latent heat, and the fan wall 2 adopts a multi-fan combination structure, and the multi-fan combination structure is configured with adjustable air volume to achieve uniform distribution of fresh air.

[0035] In this embodiment, specifically, an air volume regulating valve is provided on the return air duct 3, and the air volume regulating valve is configured to adjust the exhaust air volume according to the indoor dehumidification demand. The heating chamber 1 is configured to: supplement heat to the fresh air that has been pre-conditioned by waste heat recovery in winter, and selectively turn off the supplementary heat function in summer to directly supply air. When the waste heat recovery and fresh air purification integrated machine 4 adopts a rotary full heat exchange core, the rotary full heat exchange core synchronously recovers the sensible heat and latent heat in the exhaust air to reduce the energy consumption of temperature and humidity regulation of the fresh air.

[0036] In this embodiment, specifically, when operating in winter, the waste heat recovery and fresh air purification integrated machine 4 uses the heat in the exhaust air to heat the fresh air; when operating in summer, the waste heat recovery and fresh air purification integrated machine 4 uses the coldness in the exhaust air to cool the fresh air, and the fresh air and exhaust air in the waste heat recovery and fresh air purification integrated machine 4 are exchanged in temperature using a countercurrent or cross-flow method to improve the heat exchange efficiency.

[0037] In this embodiment, specifically, a temperature and humidity sensor is also included. The temperature and humidity sensor is arranged in the indoor dehumidification area and the fresh air supply path, and is used to jointly control the air volume regulating valve of the return air duct 3, the air volume of the fan wall 2 and the heat supply status of the heating chamber 1. The heating chamber 1, the fan wall 2, the return air duct 3 and the waste heat recovery and fresh air purification integrated machine 4 work together to achieve energy-saving operation of the dehumidification process through temperature exchange and graded adjustment.

[0038] When the present invention is working:

[0039] 1. System Structure and Connection Relationship

[0040] 1. Component positioning and connection:

[0041] Indoor dehumidification area 6: for humid spaces such as bathrooms and kitchens, an exhaust outlet is provided on the top / side wall thereof, which is sealed and connected to the inlet of the return air duct 3, serving as the source of humid exhaust air;

[0042] Return air duct 3: Made of galvanized steel plate or PVC pipe, one end is connected to the exhaust outlet of 6, and the other end is flange-connected to the exhaust inlet of the waste heat recovery and fresh air purification integrated machine 4, to directional transport indoor humid air;

[0043] The exterior wall 5 is used as the building's external protective structure. A reserved hole is provided on the fresh air introduction side, which is sealed and embedded with the fresh air inlet of the waste heat recovery and fresh air purification integrated unit 4, so that outdoor fresh air can penetrate the exterior wall 5 and enter the waste heat recovery and fresh air purification integrated unit 4;

[0044] Waste heat recovery fresh air purification all-in-one unit 4: It integrates a heat exchange core, a multi-stage purification module (primary filter + high-efficiency filter), and a variable frequency fan. Its fresh air outlet is connected to the inlet of the fan wall 2 through a flexible connection;

[0045] Fan wall 2: It is composed of an array of 3 to 5 stepless speed-regulating fans, whose outlets are connected to the inlet of heating chamber 1 through air ducts;

[0046] Heating chamber 1: It has a built-in finned electric heater (or hot water coil), and its outlet is connected to the indoor air supply main duct (covering the living room, bedroom and other areas).

[0047] 2. Workflow (Seasonal Operation Logic)

[0048] 1. Winter operation: Recover exhaust heat and reduce heating energy consumption

[0049] Exhaust path: The moist hot air (including indoor waste heat) in the indoor dehumidification area 6 → return air duct 3 → enters the exhaust channel of the waste heat recovery and fresh air purification integrated unit 4, flows evenly through the guide plate, and then contacts the heat exchange core;

[0050] Fresh air path: Outdoor low-temperature fresh air → penetrates the exterior wall 5 → enters the fresh air channel of the waste heat recovery fresh air purification integrated unit 4 → first passes through the primary filter to intercept large particles → the high-efficiency filter to filter PM2.5 → activated carbon absorbs odor → countercurrent heat exchange with exhaust air at the heat exchange core (such as a rotary full heat exchange core) (heat from the exhaust air is transferred to the fresh air);

[0051] Temperature control closed loop:

[0052] After heat exchange, the fresh air temperature rises to 12 to 16°C (close to the indoor reference temperature) → enters fan wall 2, and is dynamically distributed by multiple fans (such as low wind speed in the bedroom and high wind speed in the living room) → sent to heating room 1;

[0053] The built-in temperature sensor in heating chamber 1 monitors the fresh air temperature in real time: if it is less than 18°C, the electric heater automatically starts to heat the fresh air to 20 to 22°C → it is evenly delivered into the room through the air supply duct;

[0054] Exhaust air end: Exhaust air cooled by heat exchange (temperature drops to 15 to 18°C) → discharged to the outside through the exhaust outlet (with insect-proof net) of the waste heat recovery and fresh air purification integrated machine 4.

[0055] 2. Summer operation: Recover exhaust cooling capacity and reduce air conditioning load

[0056] Exhaust path: humid cold air in 6 (after indoor air conditioning cooling, the temperature is 24 to 26 ° C) → return air duct 3 → enters the exhaust duct of the waste heat recovery and fresh air purification integrated machine 4;

[0057] Fresh air path: Outdoor high-temperature fresh air (30 to 35°C) → penetrates the exterior wall 5 → enters the fresh air channel of the waste heat recovery and fresh air purification integrated unit 4 → is filtered by the purification module, and then cross-exchanges heat with the exhaust air at the heat exchange core (the exhaust air cooling energy is transferred to the fresh air);

[0058] Temperature control closed loop:

[0059] After heat exchange, the fresh air temperature drops to 26 to 28°C → enters fan wall 2 for equal flow → directly sent into the room (heating chamber 1 can be switched to "bypass mode" or auxiliary cooling mode. If a chilled water coil is configured, the temperature can be further reduced to 24 to 26°C).

[0060] Exhaust air end: The exhaust air heated by heat exchange (temperature rises to 28 to 30°C) → is discharged to the outside by the waste heat recovery fresh air purification integrated unit 4 to avoid waste of cooling capacity.

[0061] 3. Optimization Design and Collaborative Control Scheme

[0062] 1. Scenario Adaptation of Heat Exchange Core

[0063] Dry areas (such as the north): Use plate-type sensible heat exchange core (made of aluminum foil), give priority to recovering exhaust air temperature, and reduce heating energy consumption;

[0064] High humidity areas (such as the south): Use a rotary full heat exchange core (polymer membrane material) to simultaneously recover the sensible heat and latent heat of the exhaust air (for example, if the exhaust air humidity is 15g / kg in summer, the fresh air humidity can be reduced from 20g / kg to 17g / kg), reducing the dehumidification burden of the air conditioner.

[0065] 2. Dynamic air volume adjustment strategy

[0066] Return air duct 3: Add an electric air volume control valve, which is linked to the temperature and humidity sensor in the indoor dehumidification area 6:

[0067] When the humidity in the indoor dehumidification area 6 is greater than 85% RH or the temperature is greater than 30°C (such as when taking a bath in the bathroom), the regulating valve will automatically open to accelerate dehumidification;

[0068] When the humidity in the indoor dehumidification area 6 is less than 60% RH, the regulating valve is opened at 30% to maintain basic ventilation.

[0069] Fan wall 2: The fan adopts PID frequency conversion control and is linked with multiple indoor air supply temperature sensors: if the bedroom air supply temperature is greater than 25℃ (in summer), the fan in the corresponding area will automatically increase the frequency to increase the air supply volume.

[0070] 3. Multifunctional expansion of the heating chamber

[0071] Winter supplementary heating: The electric heater supports 0 to 100% power adjustment and is linked to the fresh air outlet temperature of the waste heat recovery fresh air purification integrated unit 4 (for example, if the fresh air is 14°C after heat exchange, the heater runs at 80% power and the temperature rises to 20°C);

[0072] Auxiliary cooling in summer: If equipped with a chilled water coil, the heating room can be switched to "cooling mode" and the fresh air temperature can be reduced from 28°C to 25°C using condensate from the central air conditioner or an independent chiller, further improving comfort.

[0073] 4. Maintenance design of purification module

[0074] The purification module of the waste heat recovery fresh air purification integrated machine 4 adopts a drawer-type structure. The filter can be quickly disassembled and replaced (primary filter once a month, high-efficiency filter once a quarter), and is equipped with a pressure difference sensor. When the filter resistance is greater than 150Pa, a replacement reminder is automatically triggered.

[0075] IV. Implementation Effect and Verification

[0076] Through the above structure and process, the system can achieve:

[0077] Energy consumption optimization:

[0078] Winter: Recover exhaust heat to reduce energy consumption in heating chamber 1 by 40% to 60% (compared to a system without heat recovery);

[0079] Summer: Recover exhaust air cooling capacity and reduce the cooling load of the air conditioning unit by 30% to 50% (because after the fresh air is pre-cooled, the air conditioner only needs to handle the indoor sensible heat load).

[0080] Improved comfort:

[0081] Fresh air is delivered indoors after being purified and pre-temperatured to avoid direct blowing of sand and dust (purification efficiency ≥ 95%) and colds caused by large temperature differences (temperature difference between supply air and indoor temperature ≤ 3°C).

[0082] The zoned air supply of fan wall 2 can achieve differentiated control of "low wind speed in bedroom and high wind speed in living room".

[0083] Stability enhancements:

[0084] Each component works together through PLC or intelligent controller (such as the return air duct regulating valve and the heating chamber linkage, the fan wall and the indoor temperature control linkage) to adapt to the seasonal climate changes and instantaneous dehumidification needs (such as sudden moisture generation in the bathroom).

[0085] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any person skilled in the art can easily conceive of various modifications and substitutions within the technical scope disclosed in the present invention, and such modifications and substitutions are intended to be within the scope of protection of the present invention. Therefore, the scope of protection of the present invention shall be subject to the scope of protection of the claims.

Claims

1. A fresh air dehumidification and energy-saving system based on waste heat recovery, comprising a waste heat recovery and fresh air purification all-in-one machine (4) integrating heat exchange function and fresh air power, characterized in that: It also includes a heating chamber (1), a fan wall (2) and a return air duct (3), wherein the waste heat recovery fresh air purification integrated machine (4) is arranged on the outer wall (5), and the fan wall (2) is arranged in an array, the inlet of the return air duct (3) is connected to the indoor dehumidification area (6) and the outlet is connected to the exhaust air inlet of the waste heat recovery fresh air purification integrated machine (4), the inlet of the waste heat recovery fresh air purification integrated machine (4) is connected to the outdoors and the fresh air outlet is connected to the inlet of the fan wall (2), the outlet of the fan wall (2) is connected to the inlet of the heating chamber (1), and the outlet of the heating chamber (1) is used to connect to the indoor air supply area; During dehumidification, the indoor humid exhaust air enters the waste heat recovery fresh air purification integrated machine (4) through the return air duct (3), and the outdoor fresh air enters the waste heat recovery fresh air purification integrated machine (4) simultaneously. The two exchange temperatures in the waste heat recovery fresh air purification integrated machine (4). After pre-adjusting the fresh air temperature, the air is evenly distributed through the fan wall (2), and then fine-tuned through the heating chamber (1) before being sent into the room. The exhaust air that has undergone temperature exchange is discharged to the outside by the waste heat recovery fresh air purification integrated machine (4).

2. The fresh air dehumidification and energy-saving system based on waste heat recovery according to claim 1 is characterized in that: The waste heat recovery and fresh air purification integrated machine (4) adopts a rotary full heat exchange core to achieve full heat exchange of sensible heat and latent heat.

3. The fresh air dehumidification and energy-saving system based on waste heat recovery according to claim 1 is characterized in that: The fan wall (2) adopts a multi-fan combination structure, and the multi-fan combination structure is configured to have an adjustable air volume to achieve uniform distribution of fresh air.

4. The fresh air dehumidification and energy-saving system based on waste heat recovery according to claim 1 is characterized in that: The return air duct (3) is provided with an air volume regulating valve, and the air volume regulating valve is configured to adjust the exhaust air volume according to the indoor dehumidification demand.

5. The fresh air dehumidification and energy-saving system based on waste heat recovery according to claim 1 is characterized in that: The heating chamber (1) is configured to: supplement heat to fresh air pre-conditioned by waste heat recovery in winter, and selectively shut down the supplementary heat function in summer to directly supply air.

6. The fresh air dehumidification and energy-saving system based on waste heat recovery according to claim 2 is characterized in that: When the waste heat recovery and fresh air purification integrated machine (4) adopts a rotary full heat exchange core, the rotary full heat exchange core simultaneously recovers sensible heat and latent heat in the exhaust air to reduce the energy consumption of regulating the temperature and humidity of the fresh air.

7. The fresh air dehumidification and energy-saving system based on waste heat recovery according to claim 1 is characterized in that: When operating in winter, the waste heat recovery and fresh air purification integrated machine (4) uses the heat in the exhaust air to heat the fresh air; when operating in summer, the waste heat recovery and fresh air purification integrated machine (4) uses the coldness in the exhaust air to cool the fresh air.

8. The fresh air dehumidification and energy-saving system based on waste heat recovery according to claim 1 is characterized in that: The fresh air and exhaust air in the waste heat recovery and fresh air purification integrated machine (4) are subjected to temperature exchange in a countercurrent or crosscurrent manner to improve heat exchange efficiency.

9. The fresh air dehumidification and energy-saving system based on waste heat recovery according to claim 1 is characterized in that: It also includes a temperature and humidity sensor, which is arranged in the indoor dehumidification area and the fresh air supply path, and is used to control the air volume regulating valve of the return air duct (3), the air volume of the fan wall (2) and the heating state of the heating chamber (1) in a linked manner.

10. A fresh air dehumidification and energy-saving system based on waste heat recovery according to any one of claims 1 to 9, characterized in that: The heating chamber (1), the fan wall (2), the return air duct (3) and the waste heat recovery and fresh air purification integrated machine (4) work in coordination to achieve energy-saving operation of the dehumidification process through temperature exchange and graded regulation.

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