CN104807355A - Heat storage heat exchanger and fresh air system thereof - Google Patents

Abstract

A heat storage heat exchanger and an air supply system including the heat storage heat exchanger, the heat exchanger includes a casing, a heat storage medium, and a fluid passage, the heat storage medium is located in the casing, and the fluid passage is located in the In the heat storage medium, the fluid channel has a fluid inlet and an outlet, the heat storage capacity of the heat storage heat exchanger is S, and the heat storage capacity S is set as a function of the distance from the fluid inlet x, that is, S=f(x) , in the regenerative heat exchanger, f'(x)>0, where f'(x) is the first derivative of f(x). The invention makes the overall heat absorption of the heat storage medium uniform in the direction of fluid flow, and avoids uneven heat absorption.

Description

A heat storage heat exchanger and its fresh air system

technical field

The invention belongs to the field of heat exchangers, in particular to a heat storage heat exchanger.

Background technique

With the rapid development of our country in the past few years, energy consumption is increasing, and energy waste is increasing, so it is urgent to design a heat storage heat exchanger for energy recovery. However, the heat storage materials of the heat accumulators in the prior art all have the same heat storage capacity, resulting in uneven heat storage on the whole of the heat accumulator, which will cause excessive heat storage, for example, the temperature near the inlet of the high-temperature fluid is too high , the life of the part will be reduced for the fluid pipeline and the heat accumulator.

In addition, my country's air pollution is becoming more and more serious, and severe air phenomena such as sandstorms and smog are becoming more and more serious. Three-quarters of urban residents cannot absorb clean air. At the same time, modern people spend 80-90% of their time indoors, and the airtightness of modern buildings increases, and various decoration materials, furniture, and daily chemicals enter the room in large quantities, causing indoor pollutants such as benzene series and volatile organic compounds (VOC), PM2.5 sources and types increase. The retention and accumulation of these harmful gases have caused the deterioration of indoor air quality, adding a layer on the basis of outdoor air pollution, and have had a serious impact on human health. Lead to leukemia, lung cancer, nervous system, respiratory system and immune system, fetal congenital defects and other diseases.

Ventilation is the key to improving indoor air quality, using outdoor fresh air to dilute indoor air pollutants and reduce the concentration. However, if the outdoor air is seriously polluted (such as sandstorms or high concentrations of inhalable particulate matter or other pollutants), it is necessary to avoid directly opening windows for ventilation. At present, the per capita area of residential buildings is usually large, and the design usually stipulates that the number of air changes per hour is 0.3 times/hour as the standard for fresh air in winter. The continuous supply of indoor fresh air will undoubtedly increase the energy consumption of the air conditioning system. According to calculations by relevant departments, the current residential The total energy consumption has accounted for 37% of the national energy consumption. Among the building energy consumption, the energy consumption for air conditioning and heating accounts for 35%~50% of the building energy consumption. With the frequent occurrence of extreme climates in winter and summer and the As the duration increases, the energy consumption of the air conditioner will continue to rise.

The new high-efficiency and energy-saving fresh air system invented by this patent has a built-in multi-layer filter device, which can effectively filter formaldehyde, VOC, and PM2.5 polluting gases up to 99.9%, and the total heat exchanger, energy storage module, etc. can recycle waste heat. After adjusting the temperature with the help of phase change materials, the sensible heat load borne by the recovery heat exchanger of the fresh air system is significantly reduced. As a thermal functional material that can absorb or release latent heat, when the ambient temperature is higher than the phase change temperature, the phase change material The phase change material absorbs heat, and when the ambient temperature drops below the phase change temperature, the phase change material releases heat, thereby achieving the functions of temperature regulation and energy storage, and the phase change material is easy to recover in time after the phase change. After establishing the phase change temperature regulation subsystem of the fresh air system, the research results show that, compared with the common fresh air system, the new fresh air system introduced in this patent has obvious advantages in terms of energy saving effect and comfort, which is of great significance to the sustainable development of energy.

Contents of the invention

The invention provides a novel heat storage heat exchanger and its high-efficiency energy-saving fresh air system. The system provides high-quality clean air on the basis of maximally saving energy.

To achieve the above object, the technical solution of the present invention is:

A heat storage heat exchanger, the heat exchanger includes a housing, a heat storage medium, and a fluid passage, the heat storage medium is located in the housing, the fluid passage is located in the heat storage medium, and the fluid passage has a fluid inlet and the outlet, the heat storage capacity of the heat storage heat exchanger is S, and the heat storage capacity S is set as a function of the distance from the fluid inlet x, that is, S=f(x), in the heat storage heat exchanger, f'( x)>0, where f'(x) is the first derivative of f(x).

Preferably, f''(x)<0, where f''(x) is the second derivative of f(x).

An air supply system provided with an accumulator, comprising a fresh air duct, a return air duct, a supply air duct, an exhaust air duct, a heat exchanger, and an energy storage module;

The return air duct and the heat exchanger are connected;

The fresh air duct and the exhaust duct are connected to the outside;

The return air duct and the air supply duct are connected to the room;

The fresh air duct, the heat exchanger, and the energy storage module are sequentially connected.

Preferably, the air supply system further includes a filtering device, and the filtering device is arranged between the fresh air duct and the heat exchanger.

Preferably, the energy storage module includes a heat storage medium and a fluid channel, the fluid channel is located in the heat storage medium, the fluid channel has a fluid inlet and an outlet, and fins are arranged outside the fluid channel, along with the flow direction of the fluid, The height of the fins gradually increases.

Preferably, with the flow direction of the fluid, the height of the fins increases more and more.

Preferably, the energy storage module includes a phase-change heat storage medium, and the quality components of the phase-change heat storage medium include the following: 50-70 parts of heat storage medium paraffin with 18-23 carbon atoms, high-density polyethylene HDPE filler 10-20 parts, melamine phosphate flame retardant 10-30 parts, expanded graphite heat conduction medium 5-15 parts.

Preferably, the energy storage module is the aforementioned heat storage heat exchanger.

Preferably, the heat storage medium is arranged in multiple pieces, and along the flow direction of the fresh air, the number of paraffin wax in different pieces increases gradually.

Preferably, the range of increasing the number of paraffin waxes decreases gradually.

Compared with the prior art, the present invention has the following beneficial effects or advantages:

1. A new heat storage heat exchanger is provided, so that the heat storage medium absorbs heat evenly in the direction of fluid flow, and avoids uneven heat absorption.

2. Compared with the prior art, the air supply system of the present invention avoids the connection between the exhaust air and the energy storage module, thereby avoiding heat transfer to the exhaust air, ensuring that all heat is transferred to the air supply, thereby greatly saving energy.

3. A new heat storage medium is provided to meet the heat storage demand of the fresh air system through the heat storage medium.

4. The present invention can further reduce the volume of the energy storage module by coating the energy storage material on the inner wall or outer wall of the air supply duct, and does not add any equipment on the appearance, so as to achieve the overall cleanliness of the equipment and save equipment space .

5. Through the control module, the current can be automatically adjusted according to the particle concentration, so as to save energy.

6. Provide a fresh air system that makes full use of the ability of phase change materials to absorb and release a large amount of latent heat and long-term cycle use. Through the temperature adjustment characteristics of phase change materials in heat exchangers, phase change energy storage modules and air supply pipes, Make the fresh air and return air fully exchange heat, maximize the retention of indoor heat, avoid unnecessary additional energy consumption, and make the fresh air temperature more comfortable; the system has high heat exchange efficiency, no pollution, energy saving and environmental protection.

7. The fresh air system involved in the present invention can obtain high-quality clean fresh air due to the purification of the fresh air through the quadruple filters in the filter module and the optimization of the distance between the filters, and the purification efficiency for fine particles ≥ 2.5 μm will be ≥ 99.9%, which improves the filtration efficiency of the fresh air system and greatly prolongs the service life of the high-efficiency filter. The fresh air system has remarkable practicability and popularization in green buildings and green energy-saving industries.

8. In the present invention, the fresh air can be blown to different positions in the room through the synchronous exchange of the air supply duct and the return air duct, so that the indoor air can form a large circulation without dead ends, and the indoor air quality can be completely improved.

Description of drawings

Fig. 1 is the structural representation of heat storage heat exchanger of the present invention;

Fig. 2 is a schematic structural view of the ventilation system of the present invention;

Fig. 3 is a schematic diagram of the structural improvement of the ventilation system of the present invention.

In the figure: 1. Fresh air duct, 2. Return air duct, 3. Supply air duct, 4. Exhaust air duct, 5. Filter module, 6. Heat exchanger, 7. Phase change energy storage module, 8 , fan, 9, control module, 10, detection module, 11, primary filter, 12, electrostatic precipitator, 13, activated carbon filter, 14, high-efficiency filter; 15 is heat storage medium, 16 is heat accumulator Housing, 17 is a fluid inlet, 18 is a fluid outlet, 19, a three-way valve; 20, a three-way valve, 21 passages, 22 passages.

Detailed ways

The present invention will be further described below in conjunction with the accompanying drawings.

Fig. 1 has shown a kind of heat storage heat exchanger, and described heat exchanger comprises housing 16, heat storage medium 15, fluid passage, and described heat storage medium 15 is located in housing 16, and described fluid passage is located in heat storage medium 15, the fluid channel has a fluid inlet 17 and an outlet 18, wherein along the flow direction of the fluid, the heat storage capacity of the heat storage medium 15 gradually increases, that is, the heat storage capacity of the heat storage heat exchanger is S, set the heat storage capacity S as a function of the distance from the fluid inlet x, that is, S=f(x), in the heat storage heat exchanger, f'(x)>0, where f'(x) is f(x ) first derivative.

If the fluid is a high-temperature fluid, as the fluid flows, the temperature of the fluid will gradually drop, so its heat release capacity will gradually decrease, and the heat storage capacity of the heat storage medium will gradually increase, so that the heat storage medium in the fluid flow The overall heat storage in the direction is uniform to avoid uneven heat storage, which will affect the uneven heat storage inside the heat storage heat exchanger and cause excessive heat storage to be easily damaged. Similarly, if the fluid is a low-temperature fluid, as the fluid flows, the temperature of the fluid will gradually increase, so its heat absorption capacity will gradually decrease, and the heat storage capacity of the heat storage medium will gradually increase, so that the heat storage medium The overall heat absorption is uniform in the direction of fluid flow, so as to avoid uneven heat absorption.

Of course, as a preference, along the direction of fluid flow, the increase in the heat storage capacity of the heat storage medium gradually decreases, that is, f''(x)<0, where f''(x) is two of f(x) Secondary derivative. Because along the flow of the fluid, the temperature of the high-temperature fluid will become lower and lower. By setting this way, the temperature of the fluid will not drop too fast, which will affect the uniformity of heat storage. It has been proved by experiments that the arrangement makes the heat storage of the heat accumulator more uniform.

The above function does not mean that the heat storage capacity of the heat storage material changes continuously, in fact the heat storage capacity of the heat storage material can be changed discretely. For example, the heat storage material included in the heat accumulator includes multiple pieces. For example, multiple pieces are arranged along the left and right direction of FIG. The heat storage capacity of the blocks gradually increases. More preferably, the magnitude of increase gradually decreases. This case is also included in the above function f(x).

Preferably, fins are arranged outside the fluid channel to enhance heat transfer. Preferably, the height of the fins gradually increases along with the flow direction of the fluid. Because as the fluid flows, the temperature of the fluid decreases continuously, and through the increase of the height of the fins, the amount of heat dissipation per unit length is basically the same on the path of the fluid flow, thereby achieving uniform heat storage.

Preferably, with the flow direction of the fluid, the fins increase more and more. Through experiments, it is found that the overall heat storage can be made more uniform by setting in this way.

Figure 2 shows an air supply system with an energy storage module, including a housing and a fresh air duct 1, a return air duct 2, an air supply duct 3, and an exhaust air duct 4 installed on the housing. A heat exchanger 6 and an energy storage module 7 are arranged in the casing; the return air duct 2 and the heat exchanger 6 are connected; the fresh air duct 1 and the exhaust air duct 4 are connected to the outdoor; The air duct 2 and the air supply duct 3 are connected to the room; the fresh air duct 1 , the heat exchanger 6 , the energy storage module 7 and the air supply duct 3 are connected in sequence.

An improvement of the above air supply system compared to the prior art is the arrangement of the energy storage module 7 . In the prior art, generally, a heat exchanger is directly arranged, and the heat exchanger connects the fresh air duct and the exhaust air duct, so as to realize the heat exchange between the fresh air and the exhaust air. Sometimes, the heat exchanger is a heat storage heat exchanger. An improvement of the present invention over the prior art is that the energy storage module 7 is arranged between the heat exchanger 6 and the air supply duct 3 . Through such setting, the flow path between the fresh air duct and the air supply channel is connected to the energy storage module 7, while the flow path between the return air duct 2 and the exhaust air duct 4 is not connected to the heat storage module, and The heat storage module is arranged downstream of the heat exchanger (that is, the supply air first flows through the heat exchanger, and then flows through the heat storage module). By setting in this way, the air supply is carried out after heat exchange by the exhaust air, and then enters the energy storage module for heat storage. In the prior art, both the exhaust air and the air supply are connected to the heat storage heat exchanger, so that when the temperature drops, for example, when both indoor and outdoor temperatures drop, the heat stored in the heat storage heat exchanger will heat the exhaust air at the same time. And the air supply, so that part of the heat is taken away by the exhaust air. Compared with the prior art, the air supply system of the present invention avoids the connection between the exhaust air and the energy storage module, thereby avoiding the transfer of heat to the exhaust air, ensuring that all the heat is transferred to the supply air, thereby greatly saving energy.

When the indoor and outdoor temperature difference is small during the day, the fresh air and the exhaust air pass through the heat exchanger 6 at the same time, realizing the temperature compensation of the exhaust air to the fresh air, and storing the excess heat through the phase-change temperature-regulating material in the energy storage module 7; When the indoor and outdoor temperature difference is large at night, the fresh air and the exhaust air pass through the heat exchanger 6 to realize the partial temperature compensation of the exhaust air to the fresh air. At the same time, the heat stored in the energy storage module 7 during the day is released through the phase change temperature regulating material Further reduce the temperature difference between the fresh air entering the room and the room, so as to avoid breaking the balance of the indoor temperature as much as possible when changing the air, and reduce the additional compensation of the indoor temperature.

Preferably, a phase change heat storage material is arranged in the energy storage module.

Preferably, a filter device is also included, and the filter device is arranged between the fresh air duct 1 and the heat exchanger 6 .

As preferably, primary filter 11, electrostatic precipitator 12, activated carbon filter 13 and high efficiency filter 14 are arranged in sequence in the filter module 5.

In the experiment, it was found that the distance between the primary filter 11, the electrostatic precipitator 12, the activated carbon filter 13 and the high efficiency filter 14 should not be too small. It should not be too large. If it is too large, the volume of the fresh air system will be too large. Therefore, through a large number of experiments, the best positional relationship between the various filters has been found:

The distance between the primary filter 11 and the electrostatic precipitator 12 is D1, the distance between the electrostatic precipitator 12 and the activated carbon filter 13 is D2, and the distance between the activated carbon filter 13 and the high efficiency filter 14 is D3 , D1, D2, D3 satisfy the following relationship: D1>D2>D3;

Further preferably, D1-D2<D2-D3;

Further preferably, D3:D2:D1=1:(1.15-1.3):(1.20-1.4);

Through the above-mentioned preferred settings, the air pressure of the filter is relatively small, the noise is lower, the filtering effect is better, and the volume is moderate.

Preferably, the distance between the primary filter 11, the electrostatic precipitator 12, the activated carbon filter 13 and the high-efficiency filter 14 is 1cm-10cm; the preferred distance between each two is 2cm-5cm.

D1, D2, and D3 refer to the distances between the adjacent surfaces of two components, for example, D1 refers to the distance between the primary filter 11 and the electrostatic precipitator 12 adjacent surfaces.

Preferably, the primary filter is one or more of non-woven fabric, nylon mesh, fluffy glass fiber felt, plastic mesh or wire mesh. Preferably, the primary filter is a composite structure comprising at least two layers, and the directions of the skeleton structure fibers of the filter in the composite structure of the adjacent two layers are perpendicular to each other. Through this arrangement, the filtering effect can reach the medium-efficiency filter. .

Preferably, the electrostatic precipitator 12 is a dual-zone electrostatic precipitator. The particles in the first zone obtain charges. In the second zone, the dust collecting plate is arranged in the second zone. Capture, and use a positive corona discharge to reduce ozone production.

Preferably, the dust collecting plate is provided with a plurality of dust collecting sheets, the air flow passages are formed between the dust collecting plates, and the distance between the dust collecting plates is 3.5-7 mm, preferably 3.5-5 mm.

Preferably, the activated carbon filter includes catalysts MnO ₂ /CuO, CuO/Ni, MnO ₂ /Pt, Fe ₃ O ₄ /CuO, Ag/Fe ₂ O ₃ , Ni/SiO ₂ that can catalytically decompose ozone one or more of.

Preferred MnO ₂ and CuO are used in combination with activated carbon as a carrier in a certain proportion, wherein the amount of MnO ₂ accounts for 50%-80%, the amount of CuO accounts for 20%-60%, and the preferred amount of MnO ₂ accounts for 60%-70%. The dosage accounts for 30%-40%. Among the transition metal oxides, the catalytic activity of _MnO2 is more excellent, the addition of CuO plays a synergistic effect and the cost is lower compared with noble metal catalysts.

Preferably, the catalyst and activated carbon are attached together on the through-hole structure of the activated carbon filter screen, and the through-hole structure is one of aluminum honeycomb, plastic honeycomb, or paper honeycomb. The material of the activated carbon is one or more of wood activated carbon, fruit shell activated carbon, coal activated carbon, petroleum activated carbon, regenerated carbon mineral raw material activated carbon, preferably the fruit shell activated carbon prepared by the activation method.

Preferably, the high-efficiency filter is made of one or more of PP filter paper, glass fiber paper, and PET filter paper.

Preferably, the air supply system further includes a control module 9 connected to the electrostatic precipitator 12 to control the electrostatic precipitator 12 . For example, it includes opening and closing, the size of the electric quantity, and the like.

As preferably, the air supply system also includes a detection module 10, the detection module 10 is used to detect the particle concentration of the fresh air, and if the fine particle data exceeds the set threshold, it sends a signal to the control module 9, and now the electrostatic precipitator in the filter module 5 is turned on Device 12 increases the filtering times of fresh air. When running into the weather with better air quality, the detection module 10 receives and judges that the fine particle data in the fresh air is lower than the set threshold, and it sends a signal to the control module 9 to close the electrostatic precipitator 12 in the filter module 5 to reduce the power consumption consumption.

Preferably, the control module 9 automatically adjusts the current in the electrostatic precipitator 12 according to the particle data, for example, when the particle data becomes larger, the current is automatically increased, and when the particle data becomes smaller, the current is automatically reduced.

A control function can be set in the control module 9, and the control module automatically adjusts the magnitude of the current according to the control function. The control function I=F(X), wherein I is the magnitude of the current, X is the particle concentration data, wherein F(X)'>0, F''(X)>0, wherein F(X)', F' '(X) is the first and second derivatives of F(X). The above formula shows that as the particle concentration increases, the current becomes larger and larger. The relationship of the above formula is obtained through a large number of experiments, because as the concentration increases, the current required is getting larger and larger, but the current does not increase in direct proportion to the increase in particle concentration, but the magnitude of the increase is getting larger and larger, only in this way , in order to better meet the needs of indoor air.

Preferably, the detection module 10 is arranged in the air supply duct 3, so that the concentration of particulate matter in the air entering the room can be directly tested.

Preferably, the detection module 10 is arranged in the fresh air duct 1 .

The control module 9 can automatically adjust the current according to the particle concentration. The control method is as follows: Assuming the current I, the particle concentration X in the fresh air duct indicates the filtering effect that meets certain conditions. The above-mentioned current I, particle concentration X reference data. The reference data is stored in the control module 9 .

When the particle concentration becomes x, the current i changes as follows:

i=I*(x/X) ^a , where a is a parameter, 1.08<a<1.14; preferably, a=1.11;

0.8< x/X <1.2.

Through the above formula, the function of intelligently purifying the air according to the particle concentration can be realized, saving electric energy.

Preferably, multiple sets of reference data can be input into the control module 9 . When two or more sets of benchmark data appear, an interface for user-selected benchmark data can be provided. Preferably, the system can automatically select the one with the smallest value of (1−x/X) ² .

Preferably, the energy storage module is the aforementioned heat storage heat exchanger, see FIG. 1 for example.

As a preference, a phase-change heat storage medium is set in the energy storage module, and the mass components of the heat storage medium include the following: 50-70 parts of heat storage medium paraffin with 18-23 carbon atoms, filled with high-density polyethylene HDPE 10-20 parts of fire retardant, 10-30 parts of melamine phosphate flame retardant, 5-15 parts of expanded graphite heat conduction medium.

For paraffin wax with 18-23 carbon atoms, the latent heat of phase change is about 160-270KJ/Kg; liquid paraffin is bound in the space network structure formed by pre-solidification of high-density polyethylene to form qualitative phase change paraffin, which solves the problem of paraffin wax in engineering. The problem of easy leakage; graphite has good adsorption and binding properties to paraffin, has good compatibility with paraffin, and has excellent thermal conductivity, which solves the problem of low thermal conductivity of paraffin and makes paraffin qualitative phase change composite materials The latent heat of phase change can be as high as 80% of the latent heat of pure paraffin.

Preferably, the heat storage medium is provided in multiple pieces, and along the flow direction of the fresh air, the number of paraffin wax in different pieces increases gradually, and the increase range decreases gradually. By increasing the fraction of paraffin and setting the increasing ratio, the heat storage capacity in the energy storage heat exchanger can be gradually increased, and the increase rate can be gradually reduced.

As a preference, the outer wall of the air supply duct 3 is covered with thermal insulation material, and the thermal insulation material is foamed polyurethane, foamed polypropylene, ceramic fiber felt or airgel felt.

Preferably, the thermal insulation material is a thermal insulation layer with a thickness of 5 to 20 mm. The thermal insulation layer is made of 3% by weight of n-pentane foaming agent, 60-80% by weight of polypropylene, 5-15% by weight of decabromodi It is made from a combination of phenylene ether flame retardant and 2-10% by weight polyvinyl chloride cell stabilizer. The apparent thermal conductivity of the above-mentioned thermal insulation material is between 0.005-0.030 W/m·K.

As another embodiment, the inner wall or the outer wall of the air supply duct 3 is coated with energy storage material. By arranging the energy storage material on the inner wall or the outer wall, it can replace the auxiliary energy storage module. Of course, the heat storage function of the auxiliary energy storage module can be played, so as to achieve the energy saving function. In the prior art, the energy storage heat exchanger is installed separately, but the present invention can further reduce the volume of the energy storage module by coating the energy storage material on the inner wall or outer wall of the air supply duct 2, and does not increase the appearance. Any equipment can achieve the overall tidiness of the equipment and save equipment space.

Preferably, the heat storage material is arranged on the inner wall. Preferably, the heat storage material is a protruding structure from the inner wall. By setting the protruding structure, the heat exchange can be enhanced.

Preferably, by setting the protruding structure, the flow of the air in the air supply duct is a spiral flow. Through the spiral flow, local short circuit in the flow is avoided, and the air is fully in contact with the energy storage material for heat exchange.

Preferably, the height of the protruding structure becomes lower and lower along the air flow direction. The main purpose is to continuously reduce the air circulation area on the one hand, thereby continuously reducing the air flow rate, so that the air can be output slowly. Therefore, the volume of the energy storage material is reduced, and waste of materials is avoided.

Preferably, the height of the protruding structure decreases gradually along the direction of air flow. It is found through experiments that the setting in this case will increase the heat storage efficiency by 10-20%.

Preferably, the energy storage material is a phase change heat storage material.

Preferably, a metal material is used to coat the energy storage material.

Preferably, along the air flow direction, the heat storage capacity of the energy storage material increases gradually.

Preferably, along the direction of fluid flow, the increase in heat storage capacity of the energy storage material decreases gradually.

The reason for the specific setting is the same as that of the previous heat storage material.

Preferably, along the flow direction of the air supply, the phase change temperature of the phase change heat storage material increases gradually. Further preferably, the phase-change thermal storage material is provided in multiple pieces, and the phase-change temperature of each piece of phase-change material increases gradually along the flow direction of the air supply.

Preferably, the energy storage material is the same as the previous heat storage medium.

Preferably, the heat storage medium is arranged in multiple pieces, and along the flow direction of the air, the number of paraffin wax in different pieces increases gradually.

Preferably, along the flow direction of the air, the range in which the fraction of paraffin wax increases gradually decreases.

Preferably, the air supply system further includes indoor air detection equipment, and the control module automatically adjusts the air supply volume according to the data detected by the air detection equipment. If the detected air quality is lower than a certain threshold, the air supply system will be automatically turned on for air supply, and if the detected air quality is higher than a certain threshold, the air supply system will be automatically turned off.

The control module 9 automatically adjusts the frequency of the air supply fan according to the indoor air quality, thereby adjusting the air supply volume. For example, if the air quality becomes poor, the frequency of the fan is automatically increased, and when the air quality becomes better, the frequency of the fan is automatically reduced.

Preferably, the control module 9 can be connected with the user through wireless communication technology, and the user can use the mobile phone app to know the indoor air quality status, perform remote operations such as switching on and off the fresh air system, adjusting the air volume, and selecting a filtering mode.

The fresh air system is provided with two channels 21, 22 between the return air channel 2 and the air supply channel 3, wherein the communication position (the first communication position) between the channel 21 and the air supply channel 3 is higher than that of the channel 22 and the supply air channel. The communication position of the wind duct 3 (the second communication position) is closer to the fresh air system housing, where the channel 21 communicates with the return air duct 2 (the third communication position) than the position where the channel 22 communicates with the return air duct 2 ( The fourth communication position) is further away from the shell of the fresh air system. Among them, the first valve, the second valve, the third valve and the fourth valve are respectively set in the return air duct 2, the air supply duct 3, and the passages 20 and 21, which are used to open and close the return air duct 2 and the supply air duct. Channel 3, channels 20, 21, the fresh air duct valve is set between the first communication position and the second communication position, the return air duct valve is set between the third communication position and the fourth communication position, and the The opening and closing can make the intermittent synchronous exchange of the air supply duct 3 and the return air duct 2, and at the same time, the fresh air outlet installed in the room and the return air outlet can be exchanged synchronously. Through the exchange, the fresh air can be blown to the indoor area. Different locations, so that the indoor air forms a large circulation without dead ends, and thoroughly improves the indoor air quality. For example, by opening the third valve and the fourth valve and closing the first valve and the second valve at the same time, the synchronous exchange between the fresh air outlet and the return air outlet can be realized.

As an alternative, the first valve and the fourth valve can be replaced by the three-way valve 20 , and the second valve and the third valve can be replaced by the three-way valve 19 . The three-way valve 20 is provided at the fourth communication position, and the three-way valve 19 is provided at the first communication position.

Preferably, the control module 9 can control the opening and closing of the air valve, so as to realize the intermittent synchronous exchange between the air supply air duct 3 and the air return air duct 2 .

As a preference, for the embodiment in FIG. 3 , the heat storage material on the inner wall and/or outer wall of the air supply duct 3 is arranged between the casing and the first communication position.

As a preference, the fresh air is selected to process an air volume of 200-400m ³ /h, preferably 300m ³ /h.

Further preferably, a heat storage medium is arranged in the heat exchanger, and the heat storage medium is the aforementioned heat storage medium. When the indoor and outdoor temperature difference is small during the day, the fresh air and exhaust air pass through the heat exchanger 6 loaded with phase-change temperature-regulating materials at the same time, realizing the temperature compensation of the exhaust air to the fresh air, and passing excess heat through the heat exchanger 6 and the energy storage module 7 and the phase-change temperature-regulating material in the air supply duct 3 are stored; when the indoor and outdoor temperature difference is large at night, the fresh air and the exhaust air pass through the heat exchanger 6 to realize partial temperature compensation of the exhaust air to the fresh air, and at the same time, during the day The heat stored in the heat exchanger 6, the energy storage module 7 and the air supply duct 3 is released through the phase-change temperature-regulating material, which further reduces the temperature difference between the fresh air entering the room and the room, so as to avoid breaking as much as possible when changing the air. The balance of the room temperature reduces the additional compensation of the room temperature.

Although the present invention has been disclosed above with preferred embodiments, the present invention is not limited thereto. Any person skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention, so the protection scope of the present invention should be based on the scope defined in the claims.

Claims (10)

1. a regenerative heat exchanger, described heat exchanger comprises housing, heat storage medium, fluid passage, described heat storage medium is positioned at housing, and described fluid passage is positioned at heat storage medium, and described fluid passage has fluid intake and outlet, the heat storage capacity of described regenerative heat exchanger is S, heat storage capacity S is set to the function of distance fluid intake x, i.e. S=f(x), in regenerative heat exchanger, f ' is >0 (x), wherein f'(x) be f(x) first order derivative.

2. regenerative heat exchanger as claimed in claim 1, is characterized in that, f''(x) <0, wherein f''(x) be f(x) and second derivative.

3. a supply air system for accumulator is set, comprises new wind air channel (1), return airway (2), supply air duct (3), wind output channel (4), heat exchanger (6), energy-storage module (7);

Described return airway (2), heat exchanger (6) connect;

Described new wind air channel (1) is connected with outdoor with wind output channel (4);

Described return airway (2) is connected with indoor with supply air duct (3);

It is characterized in that, described new wind air channel (1), heat exchanger (6), energy-storage module (7) connect successively.

4. supply air system according to claim 3, is characterized in that, also comprises filter, and described filter is arranged between new wind air channel and heat exchanger.

5. supply air system according to claim 3, it is characterized in that, described energy storage module comprises heat storage medium, fluid passage, described fluid passage is positioned at heat storage medium, described fluid passage has fluid intake and outlet, fluid passage outer setting fin, along with the flow direction of fluid, the height of fin increases gradually.

6. supply air system according to claim 3, is characterized in that, along with the flow direction of fluid, the amplitude that fin height increases is increasing.

7. the supply air system as described in one of claim 3-4, it is characterized in that, energy storage module comprises phase-change heat accumulation medium, described phase-change heat accumulation medium mass component comprises as follows: by heat storage medium paraffin 50-70 part of 18-23 carbon atom, high density polyethylene filler 10-20 part, melamine phosphate fire retardant 10-30 part, expanded graphite heat-conducting medium 5-15 part.

8. supply air system as claimed in claim 3, is characterized in that, described energy storage module is the regenerative heat exchanger described in one of claim 1-2.

9. supply air system as claimed in claim 7, it is characterized in that, heat storage medium is set to polylith, and along on the flow direction of new wind, in different masses, the number of paraffin increases gradually.

10. supply air system as claimed in claim 10, is characterized in that, the amplitude that wherein number of paraffin increases reduces gradually.