Hierarchical processing air conditioning system suitable for building inner and outer areas and control method thereof

Abstract

The application provides a hierarchical processing air conditioning system suitable for inner and outer areas of a building and a control method thereof. The hierarchical processing air conditioning system suitable for the inner and outer areas of the building comprises: a first circulating loop, a first cold heat source arranged on the first circulating loop; a second circulating loop, a second cold heat source arranged on the second circulating loop, and the grade of the second cold heat source is lower than that of the first cold heat source; a third circulating loop, a natural energy collecting device for collecting natural energy arranged on the third circulating loop; an outer area circulating fan unit, the outer area circulating fan unit comprising an outer area circulating air fan, a first outer area circulating air heat exchanger and a second outer area circulating air heat exchanger; an outer area fresh air unit, the outer area fresh air unit comprising an outer area fresh air fan, a first outer area fresh air heat exchanger, a second outer area fresh air heat exchanger and a third outer area fresh air heat exchanger. The technical defects of energy utilization grade waste caused by the existing heating air conditioning system can be solved, and the energy efficiency when corresponding energy grade is generated is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the air conditioning technical field, and especially relates to a hierarchical processing air conditioning system suitable for inner and outer areas of a building and a control method thereof. BACKGROUND

[0002] In the prior art, a heating and air conditioning system uniformly processes cold / heat load. In summer, low-temperature chilled water is prepared by using high-grade electric energy to process circulating air cold load and fresh air cold load. In winter, high-temperature hot water or hot air is prepared by using high-grade fuel or electric energy to process circulating air heat load and fresh air heat load. The above-mentioned heating and air conditioning system uniformly processes cold / heat load, which is of high energy grade and does not match the grade of part of the load, resulting in waste of energy utilization grade.

[0003] In addition, for a building with an inner area, even in winter, mechanical cold and heat sources are used to supply cold, and the natural cold source of the outside world is not utilized, and the waste heat of the inner area is wasted, which is not conducive to building energy saving.

[0004] Therefore, there is an urgent need for a hierarchical processing air conditioning system suitable for inner and outer areas of a building and a control method thereof to solve the above-mentioned problems. SUMMARY

[0005] The present application provides a hierarchical processing air conditioning system suitable for inner and outer areas of a building and a control method thereof to solve the technical defects of waste of energy utilization grade caused by the prior art heating and air conditioning system, and improve the energy efficiency when preparing corresponding energy grade.

[0006] The present application provides a hierarchical processing air conditioning system suitable for inner and outer areas of a building, comprising:

[0007] A first circulating loop, wherein a first cold and heat source is arranged on the first circulating loop;

[0008] A second circulating loop, wherein a second cold and heat source is arranged on the second circulating loop, and the grade of the second cold and heat source is lower than that of the first cold and heat source;

[0009] A third circulating loop, wherein a natural energy collecting device for collecting natural energy is arranged on the third circulating loop;

[0010] An outer area circulating air fan unit, wherein the outer area circulating air fan unit comprises an outer area circulating air fan, a first outer area circulating air heat exchanger and a second outer area circulating air heat exchanger, the outer area circulating air fan is used to drive air to exchange heat with the first outer area circulating air heat exchanger and the second outer area circulating air heat exchanger; the first outer area circulating air heat exchanger is arranged in parallel across the second cold and heat source on the second circulating loop, and the second outer area circulating air heat exchanger is arranged in parallel across the first cold and heat source on the first circulating loop;

[0011] The outer zone fresh air unit comprises an outer zone fresh air fan, a first outer zone fresh air heat exchanger, a second outer zone fresh air heat exchanger and a third outer zone fresh air heat exchanger, the outer zone fresh air fan is used to drive air to exchange heat with the first outer zone fresh air heat exchanger, the second outer zone fresh air heat exchanger and the third outer zone fresh air heat exchanger; the first outer zone fresh air heat exchanger is arranged in parallel at both ends of the natural energy collection device on the third circulating loop, the second outer zone fresh air heat exchanger is arranged in parallel at both ends of the second cold heat source on the second circulating loop, and the third outer zone fresh air heat exchanger is arranged in parallel at both ends of the first cold heat source on the first circulating loop.

[0012] According to the application, the hierarchical processing air conditioning system suitable for the inner and outer zones of a building further comprises an inner zone circulating fan unit, the inner zone circulating fan unit comprises an inner zone circulating fan, a first inner zone circulating three-medium heat exchanger and a second inner zone circulating three-medium heat exchanger, and the inner zone circulating fan is used to drive air to exchange heat with the first inner zone circulating three-medium heat exchanger and the second inner zone circulating three-medium heat exchanger.

[0013] The first inner zone circulating three-medium heat exchanger and the second inner zone circulating three-medium heat exchanger each comprise a first inner zone circulating heat exchange channel and a second inner zone circulating heat exchange channel, the first inner zone circulating heat exchange channel of the first inner zone circulating three-medium heat exchanger is arranged in parallel at both ends of the second cold heat source on the second circulating loop, the second inner zone circulating heat exchange channel of the first inner zone circulating three-medium heat exchanger is arranged in parallel at both ends of the natural energy collection device on the third circulating loop, the first inner zone circulating heat exchange channel of the second inner zone circulating three-medium heat exchanger is arranged in parallel at both ends of the first cold heat source on the first circulating loop, and the second inner zone circulating heat exchange channel of the second inner zone circulating three-medium heat exchanger is arranged in parallel at both ends of the natural energy collection device on the third circulating loop.

[0014] According to the application, the hierarchical processing air conditioning system suitable for the inner and outer zones of a building further comprises an inner zone fresh air unit, the inner zone fresh air unit comprises an inner zone fresh air fan, a first inner zone fresh air heat exchanger, a second inner zone fresh air heat exchanger and a third inner zone fresh air heat exchanger, and the inner zone fresh air fan is used to drive air to exchange heat with the first inner zone fresh air heat exchanger, the second inner zone fresh air heat exchanger and the third inner zone fresh air heat exchanger.

[0015] The first inner zone fresh air heat exchanger is arranged in parallel at both ends of the natural energy collection device on the third circulating loop, the second inner zone fresh air heat exchanger is arranged in parallel at both ends of the second cold heat source on the second circulating loop, and the third inner zone fresh air heat exchanger is arranged in parallel at both ends of the first cold heat source on the first circulating loop.

[0016] The application provides a hierarchical treatment air conditioning system suitable for an inner area and an outer area of a building, wherein the first outer area circulating air heat exchanger comprises a first outer area circulating air heat exchange channel and a second outer area circulating air heat exchange channel, the first outer area circulating air heat exchange channel is arranged in parallel on both ends of the second cold heat source on the second circulating loop, and the second outer area circulating air heat exchange channel is arranged in parallel on both ends of the natural energy collecting device on the third circulating loop.

[0017] The second outer area fresh air heat exchanger comprises a first outer area fresh air heat exchange channel and a second outer area fresh air heat exchange channel, the first outer area fresh air heat exchange channel is arranged in parallel on both ends of the second cold heat source on the second circulating loop, and the second outer area fresh air heat exchange channel is arranged in parallel on both ends of the natural energy collecting device on the third circulating loop.

[0018] The second inner area fresh air heat exchanger comprises a first inner area fresh air heat exchange channel and a second inner area fresh air heat exchange channel, the first inner area fresh air heat exchange channel is arranged in parallel on both ends of the second cold heat source on the second circulating loop, and the second inner area fresh air heat exchange channel is arranged in parallel on both ends of the natural energy collecting device on the third circulating loop.

[0019] The application provides a hierarchical treatment air conditioning system suitable for an inner area and an outer area of a building, wherein the third circulating loop is connected with the second circulating loop.

[0020] The application provides a hierarchical treatment air conditioning system suitable for an inner area and an outer area of a building, wherein a circulating pump is arranged on a main trunk pipeline connecting the inner area circulating fan group on the third circulating loop.

[0021] The application provides a hierarchical treatment air conditioning system suitable for an inner area and an outer area of a building, wherein air bypass devices are arranged on one side of the first outer area circulating air heat exchanger and the second outer area circulating air heat exchanger respectively.

[0022] Air bypass devices are arranged on one side of the first outer area fresh air heat exchanger, the second outer area fresh air heat exchanger and the third outer area fresh air heat exchanger respectively.

[0023] Air bypass devices are arranged on one side of the first inner area circulating air three-medium heat exchanger and the second inner area circulating air three-medium heat exchanger respectively.

[0024] Air bypass devices are arranged on one side of the first inner area fresh air heat exchanger, the second inner area fresh air heat exchanger and the third inner area fresh air heat exchanger respectively.

[0025] The application provides a hierarchical processing air conditioning system suitable for indoor and outdoor areas of a building, wherein a circulating pump is arranged on each of the first circulating loop, the second circulating loop and the third circulating loop.

[0026] The application further provides a control method based on the hierarchical processing air conditioning system suitable for indoor and outdoor areas of a building.

[0027] An outdoor environment temperature threshold range T1-T2 is preset, and an indoor cooling demand threshold G0 is preset.

[0028] An outdoor environment temperature signal T is collected, and a cooling demand value signal G is obtained.

[0029] When T is higher than T2, the first cold heat source, the second cold heat source and the natural energy collection device are started.

[0030] When T is between T1 and T2, the first cold heat source and the natural energy collection device are started, and the second cold heat source is stopped.

[0031] When T is lower than T1, the first cold heat source, the second cold heat source and the natural energy collection device are started.

[0032] When T is lower than T1 and G is less than G0, the first cold heat source and the second cold heat source are started, and a waste heat recovery loop between the indoor circulating air fan group and the outdoor fresh air fan group is started.

[0033] When T is lower than T1 and G is greater than G0, the first cold heat source, the second cold heat source and the natural energy collection device are started, and the waste heat recovery loop between the indoor circulating air fan group and the outdoor fresh air fan group is started.

[0034] When T is lower than T1 and G is less than G0, the first cold heat source and the second cold heat source are started, and a waste heat recovery loop between the indoor circulating air fan group and the outdoor fresh air fan group and the indoor fresh air fan group is started.

[0035] When T is lower than T1 and G is greater than G0, the first cold heat source, the second cold heat source and the natural energy collection device are started, and the waste heat recovery loop between the indoor circulating air fan group and the outdoor fresh air fan group and the indoor fresh air fan group is started.

[0036] The application provides a hierarchical processing air conditioning system suitable for inner and outer areas of a building and a control method thereof. BRIEF DESCRIPTION OF DRAWINGS

[0037] In order to more clearly illustrate the technical solutions in the application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description are some embodiments of the application, and other drawings can be obtained by those skilled in the art without any creative effort on the basis of these drawings.

[0038] Figure 1 Fig. 1 is a schematic diagram of embodiment 1 of the hierarchical processing air conditioning system suitable for inner and outer areas of a building provided by the application;

[0039] Figure 2 Fig. 2 is a schematic diagram of embodiment 2 of the hierarchical processing air conditioning system suitable for inner and outer areas of a building provided by the application;

[0040] Figure 3 Fig. 3 is a schematic diagram of embodiment 3 of the hierarchical processing air conditioning system suitable for inner and outer areas of a building provided by the application;

[0041] Figure 4 Fig. 4 is a schematic diagram of one of the operation modes of the hierarchical processing air conditioning system suitable for inner and outer areas of a building in embodiment 3;

[0042] Figure 5 Fig. 5 is a schematic diagram of another operation mode of the hierarchical processing air conditioning system suitable for inner and outer areas of a building in embodiment 3;

[0043] Figure 6 Fig. 6 is a schematic diagram of a third operation mode of the hierarchical processing air conditioning system suitable for inner and outer areas of a building in embodiment 3;

[0044] Figure 7 Fig. 7 is a schematic diagram of embodiment 4 of the hierarchical processing air conditioning system suitable for inner and outer areas of a building provided by the application;

[0045] Figure 8 Fig. 8 is a schematic diagram of embodiment 5 of the hierarchical processing air conditioning system suitable for inner and outer areas of a building provided by the application;

[0046] Figure 9is a schematic view of the embodiment 6 of the hierarchical processing air conditioning system suitable for the inner and outer zones of a building provided by the present application.

[0047] Reference signs:

[0048] 1, first circulation loop; 11, first cold heat source;

[0049] 2, second circulation loop; 21, second cold heat source;

[0050] 3, third circulation loop; 31, natural energy collection device;

[0051] 4, outer zone circulating air fan unit; 41, first outer zone circulating air heat exchanger; 42, second outer zone circulating air heat exchanger; 43, outer zone circulating air fan;

[0052] 5, outer zone fresh air fan unit; 51, first outer zone fresh air heat exchanger; 52, second outer zone fresh air heat exchanger; 53, third outer zone fresh air heat exchanger; 54, outer zone fresh air fan;

[0053] 6, inner zone circulating air fan unit; 61, first inner zone circulating air three-medium heat exchanger; 62, second inner zone circulating air three-medium heat exchanger; 63, inner zone circulating air fan;

[0054] 7, inner zone fresh air fan unit; 71, first inner zone fresh air heat exchanger; 72, second inner zone fresh air heat exchanger; 73, third inner zone fresh air heat exchanger; 74, inner zone fresh air fan;

[0055] 8, air bypass device; 9, circulating pump. DETAILED DESCRIPTION

[0056] In order to make the objects, technical solutions and advantages of the present application clearer, the technical solutions in the present application will be described clearly and completely below in combination with the drawings in the present application. Obviously, the described embodiments are some of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the present application.

[0057] The hierarchical processing air conditioning system suitable for the inner and outer zones of a building and the control method thereof provided by the present application will be described below in combination with Figures 1-9 the drawings.

[0058] Embodiment 1

[0059] As shown in the figure, it is a schematic view of the embodiment 1 of the hierarchical processing air conditioning system suitable for the inner and outer zones of a building provided by the present application. The hierarchical processing air conditioning system suitable for the inner and outer zones of a building in the present embodiment comprises: Figure 1

[0060] ​The first circulation loop 1 is provided with a first cold heat source 11.

[0061] The second circulation loop 2 is provided with a second cold heat source 21, and the grade of the second cold heat source 21 is lower than that of the first cold heat source 11. The first cold heat source 11 is a high-grade cold heat source, and the second cold heat source 21 is a medium-grade cold heat source.

[0062] The third circulation loop 3 is provided with a natural energy collection device 31 for collecting natural energy. The natural energy collection device 31 can be one or a combination of a cooling tower, a buried pipe, a wind-cooled heat exchanger, a river-lake-sea heat exchanger, and a solar energy collector.

[0063] The outer zone circulating air fan unit 4 includes an outer zone circulating air fan 43, a first outer zone circulating air heat exchanger 41, and a second outer zone circulating air heat exchanger 42. The outer zone circulating air fan 43 is used to drive air to exchange heat with the first outer zone circulating air heat exchanger 41 and the second outer zone circulating air heat exchanger 42. The first outer zone circulating air heat exchanger 41 is connected in parallel across the second cold heat source 21 of the second circulation loop 2, and the second outer zone circulating air heat exchanger 42 is connected in parallel across the first cold heat source 11 of the first circulation loop 1.

[0064] The outer zone fresh air fan unit 5 includes an outer zone fresh air fan 54, a first outer zone fresh air heat exchanger 51, a second outer zone fresh air heat exchanger 52, and a third outer zone fresh air heat exchanger 53. The outer zone fresh air fan 54 is used to drive air to exchange heat with the first outer zone fresh air heat exchanger 51, the second outer zone fresh air heat exchanger 52, and the third outer zone fresh air heat exchanger 53. The first outer zone fresh air heat exchanger 51 is connected in parallel across the natural energy collection device 31 of the third circulation loop 3, the second outer zone fresh air heat exchanger 52 is connected in parallel across the second cold heat source 21 of the second circulation loop 2, and the third outer zone fresh air heat exchanger 53 is connected in parallel across the first cold heat source 11 of the first circulation loop 1.

[0065] It should be noted that the number of stages of the outer zone circulating air fan unit 4 and the outer zone fresh air fan unit 5 can be set according to requirements, and it is greater than or equal to two stages.

[0066] As shown in Figure 1 In this embodiment, the first circulation loop 1, the second circulation loop 2, and the third circulation loop 3 are respectively provided with a circulating pump 9. The circulating pump 9 can drive the heat exchange medium to flow in each circulation loop.

[0067] In this embodiment, the external zone circulating air unit 4 adopts a two-stage treatment (first external zone circulating air heat exchanger 41 and second external zone circulating air heat exchanger 42). The first external zone circulating air heat exchanger 41 and the second external zone circulating air heat exchanger 42 are respectively connected to the second circulation loop 2 and the first circulation loop 1, and both are mechanical heat sources. The external zone fresh air unit 5 adopts a three-stage treatment (first external zone fresh air heat exchanger 51, second external zone fresh air heat exchanger 52 and third external zone fresh air heat exchanger 53). The first external zone fresh air heat exchanger 51 is connected to the third circulation loop 3 and is a natural energy source. The second external zone fresh air heat exchanger 52 and the third external zone fresh air heat exchanger 53 are respectively connected to the second circulation loop 2 and the first circulation loop 1, and both are mechanical heat sources.

[0068] This embodiment of the graded air conditioning system applicable to the indoor and outdoor areas of a building, according to the changes in the ambient temperature and the outlet water temperature of the natural energy collection device 31, opens or closes the high-grade cold and heat source, the medium-grade cold and heat source, and the natural energy collection device 31, and switches the valve status to introduce two and / or three different temperatures of circulating medium into different heat exchangers, making full use of natural energy and waste heat in the indoor area, and realizing a graded treatment process that matches the air cooling and heating load with the energy grade.

[0069] Example 2

[0070] like Figure 2 The diagram shown is a schematic of Embodiment 2 of the graded air conditioning system for indoor and outdoor zones of a building provided by the present invention. Compared with Embodiment 1, this embodiment also includes an indoor zone circulating fan unit 6. The indoor zone circulating fan unit 6 includes an indoor zone circulating fan 63, a first indoor zone circulating air three-medium heat exchanger 61 and a second indoor zone circulating air three-medium heat exchanger 62. The indoor zone circulating fan 63 is used to drive air to exchange heat with the first indoor zone circulating air three-medium heat exchanger 61 and the second indoor zone circulating air three-medium heat exchanger 62.

[0071] Both the first inner zone circulating air three-medium heat exchanger 61 and the second inner zone circulating air three-medium heat exchanger 62 include a first inner zone circulating air heat exchange channel and a second inner zone circulating air heat exchange channel. The first inner zone circulating air heat exchange channel of the first inner zone circulating air three-medium heat exchanger 61 is connected in parallel to both ends of the second cold and heat source 21 on the second circulation loop 2. The second inner zone circulating air heat exchange channel of the first inner zone circulating air three-medium heat exchanger 61 is connected in parallel to both ends of the natural energy harvesting device 31 on the third circulation loop 3. The first inner zone circulating air heat exchange channel of the second inner zone circulating air three-medium heat exchanger 62 is connected in parallel to both ends of the first cold and heat source 11 on the first circulation loop 1. The second inner zone circulating air heat exchange channel of the second inner zone circulating air three-medium heat exchanger 62 is connected in parallel to both ends of the natural energy harvesting device 31 on the third circulation loop 3.

[0072] It should be noted that the number of stages of the internal circulation fan unit 6 can be set according to requirements, and two stages or more are sufficient.

[0073] In this embodiment, the outer zone circulating fan unit 4 adopts a two-stage treatment (first outer zone circulating air heat exchanger 41 and second outer zone circulating air heat exchanger 42). The first outer zone circulating air heat exchanger 41 and the second outer zone circulating air heat exchanger 42 are respectively connected to the second circulating loop 2 and the first circulating loop 1, and both are mechanical heat sources. The inner zone circulating fan unit 6 adopts a two-stage treatment (first inner zone circulating air three-medium heat exchanger 61 and second inner zone circulating air three-medium heat exchanger 62). The first inner zone circulating air heat exchange channel and the second inner zone circulating air heat exchange channel of the first inner zone circulating air three-medium heat exchanger 61 are respectively connected to the second circulating loop 2 and the third circulating loop 3. The first inner zone circulating air heat exchange channel and the second inner zone circulating air heat exchange channel of the second inner zone circulating air three-medium heat exchanger 62 are respectively connected to the first circulating loop 1 and the third circulating loop 3. In summer, the cooling function is achieved by connecting with the first circulation loop 1 and the second circulation loop 2. The secondary processing is a mechanical cold and heat source. In winter, it can be used for preheating of the external fresh air unit 5 by connecting with the third circulation loop 3, or the heat can be dissipated to the natural energy collection device 31. The external fresh air unit 5 adopts a three-stage processing (first external fresh air heat exchanger 51, second external fresh air heat exchanger 52 and third external fresh air heat exchanger 53). The first external fresh air heat exchanger 51 is connected to the third circulation loop 3 and is a natural energy source or internal waste heat source. The second external fresh air heat exchanger 52 and the third external fresh air heat exchanger 53 are connected to the second circulation loop 2 and the first circulation loop 1 respectively, and are both mechanical cold and heat sources.

[0074] This embodiment of the graded air conditioning system applicable to the interior and exterior zones of a building, by adding an interior zone circulating fan unit 6 and connecting it to the fresh air unit, on the one hand, the waste heat in the interior zone is treated by low-temperature fresh air, eliminating the need for a mechanical cooling source; on the other hand, the low-temperature fresh air is preheated by the waste heat in the interior zone, reducing the fresh air heat load that high-grade energy sources such as heat pumps need to bear. Therefore, free cooling in the interior zone and free heating of the fresh air can be achieved.

[0075] Example 3

[0076] like Figure 3 The diagram shown is a schematic of embodiment 3 of the graded air conditioning system for indoor and outdoor zones of a building provided by the present invention. Compared with embodiment 2, this embodiment also includes an indoor zone fresh air unit 7. The indoor zone fresh air unit 7 includes an indoor zone fresh air fan 74, a first indoor zone fresh air heat exchanger 71, a second indoor zone fresh air heat exchanger 72, and a third indoor zone fresh air heat exchanger 73. The indoor zone fresh air fan 74 is used to drive air to exchange heat with the first indoor zone fresh air heat exchanger 71, the second indoor zone fresh air heat exchanger 72, and the third indoor zone fresh air heat exchanger 73.

[0077] The first inner zone fresh air heat exchanger 71 is arranged in parallel at both ends of the natural energy collection device 31 on the third circulation loop 3, the second inner zone fresh air heat exchanger 72 is arranged in parallel at both ends of the second cold heat source 21 on the second circulation loop 2, and the third inner zone fresh air heat exchanger 73 is arranged in parallel at both ends of the first cold heat source 11 on the first circulation loop 1. On the third circulation loop 3, the main pipeline of the inner zone circulation fan group 6 is provided with a circulating pump 9, and in the embodiment, the circulating pump 9 is located on the pipeline between the inner zone circulation fan group 6 and the inner zone fresh air fan group 7.

[0078] It should be noted that the number of stages of the inner zone fresh air fan group 7 can be set according to requirements, and is greater than or equal to two stages.

[0079] In the embodiment, the outer zone circulation fan group 4 adopts two-stage processing (the first outer zone circulation air heat exchanger 41 and the second outer zone circulation air heat exchanger 42), the first outer zone circulation air heat exchanger 41 and the second outer zone circulation air heat exchanger 42 are connected with the second circulation loop 2 and the first circulation loop 1 respectively, and are mechanical cold heat sources; the inner zone circulation fan group 6 adopts two-stage processing (the first inner zone circulation air three-medium heat exchanger 61 and the second inner zone circulation air three-medium heat exchanger 62), the first inner zone circulation air heat exchange channel and the second inner zone circulation air heat exchange channel of the first inner zone circulation air three-medium heat exchanger 61 are connected with the second circulation loop 2 and the third circulation loop 3 respectively, the first inner zone circulation air heat exchange channel and the second inner zone circulation air heat exchange channel of the second inner zone circulation air three-medium heat exchanger 62 are connected with the first circulation loop 1 and the third circulation loop 3 respectively, in summer, the cooling function is realized by being connected with the first circulation loop 1 and the second circulation loop 2, the two-stage processing is mechanical cold heat source, in winter, by being connected with the third circulation loop 3, the heat can be used for preheating of the outer zone fresh air fan group 5, or the heat can be dispersed to the natural energy collection device 31; the inner zone fresh air fan group 7 adopts three-stage processing (the first inner zone fresh air heat exchanger 71, the second inner zone fresh air heat exchanger 72 and the third inner zone fresh air heat exchanger 73), the first inner zone fresh air heat exchanger 71 is connected with the third circulation loop 3, and is a self-heating cold source or inner zone waste heat, the second inner zone fresh air heat exchanger 72 and the third inner zone fresh air heat exchanger 73 are connected with the second circulation loop 2 and the first circulation loop 1 respectively, and are mechanical cold heat sources.

[0080] The three operation modes of the embodiment will be described in detail below.

[0081] Mode one-summer: cooling is required in the inner zone and the outer zone

[0082] For example, Figure 4As shown, it is a schematic diagram of one of the operation modes of the hierarchical processing air conditioning system suitable for the inner and outer zones of the building in the present embodiment. In this mode, in each outer zone circulating fan unit 4, the valve on the pipeline connecting the first outer zone circulating air heat exchanger 41 and the second outer zone circulating air heat exchanger 42 with the second circulating loop 2 and the first circulating loop 1 is open; in each inner zone circulating fan unit 6, the valve on the pipeline connecting the first inner zone circulating air heat exchanger 61 of the first inner zone circulating air three-medium heat exchanger with the second circulating loop 2 is open, the valve on the pipeline connecting the first inner zone circulating air heat exchanger 61 of the second inner zone circulating air three-medium heat exchanger with the first circulating loop 1 is open, the valves on the pipelines connecting the second inner zone circulating air heat exchanger of the first inner zone circulating air three-medium heat exchanger 61 and the second inner zone circulating air three-medium heat exchanger 62 with the third circulating loop 3 are closed; in each inner zone fresh air fan unit 7, the valves on the pipelines connecting the first inner zone fresh air heat exchanger 71, the second inner zone fresh air heat exchanger 72 and the third inner zone fresh air heat exchanger 73 with the third circulating loop 3, the second circulating loop 2 and the first circulating loop 1 are open; in each outer zone fresh air fan unit 5, the valves on the pipelines connecting the first outer zone fresh air heat exchanger 51, the second outer zone fresh air heat exchanger 52 and the third outer zone fresh air heat exchanger 53 with the third circulating loop 3, the second circulating loop 2 and the first circulating loop 1 are open; on the third circulating loop 3, the valve controlling the natural energy collection device 31 is open. The outer zone circulating fan unit 4 and the inner zone circulating fan unit 6 both adopt two-stage processing and are mechanical cold and heat sources, and the outer zone circulating fresh air fan unit 5 and the inner zone fresh air fan unit 7 both adopt three-stage processing, the first stage of which is a natural energy source and the second and third stages are mechanical cold and heat sources.

[0083] Mode two - winter: outer zone heating, inner zone cooling, and the inner zone cooling demand is small

[0084] As Figure 5Fig. 2 is a schematic diagram of the second mode of the hierarchical processing air conditioning system suitable for the inner and outer zones of the building according to the embodiment. In this mode, in each outer zone circulating fan unit 4, the valve on the pipeline connecting the first outer zone circulating air heat exchanger 41 and the second outer zone circulating air heat exchanger 42 to the second circulating loop 2 and the first circulating loop 1 is open; in each inner zone circulating fan unit 6, the valve on the pipeline connecting the first inner zone circulating air heat exchanger 61 of the first inner zone circulating air three-medium heat exchanger to the second circulating loop 2 is closed, the valve on the pipeline connecting the first inner zone circulating air heat exchanger 61 of the second inner zone circulating air three-medium heat exchanger to the first circulating loop 1 is closed, and the valves on the pipelines connecting the second inner zone circulating air heat exchanger 62 of the first inner zone circulating air three-medium heat exchanger and the second inner zone circulating air three-medium heat exchanger to the third circulating loop 3 are open; in each inner zone fresh air fan unit 7, the valve on the pipeline connecting the first inner zone fresh air heat exchanger 71 to the third circulating loop 3 is open, and the valves on the pipelines connecting the second inner zone fresh air heat exchanger 72 and the third inner zone fresh air heat exchanger 73 to the second circulating loop 2 and the first circulating loop 1 are closed; in each outer zone fresh air fan unit 5, the valves on the pipelines connecting the first outer zone fresh air heat exchanger 51, the second outer zone fresh air heat exchanger 52, and the third outer zone fresh air heat exchanger 53 to the third circulating loop 3, the second circulating loop 2, and the first circulating loop 1 are open; and on the third circulating loop 3, the valve controlling the natural energy collection device 31 is closed. The outer zone circulating fan unit 4 is supplied with heat from the second stage of processing, and the heat source is a heat pump; the inner zone circulating fan unit 6 is supplied with cold from the pre-cooling of the inner zone fresh air fan unit 7 and the outer zone fresh air fan unit 5, and the cold is sufficient to meet the cooling demand of the inner zone circulating fan unit 6; the outer zone fresh air fan unit 5 is preheated by the circulating air of the inner zone, but because the cooling demand of the inner zone is relatively small, the outer zone fresh air fan unit 5 cannot be preheated to a high temperature, so the heat pump is used for further heating in the second and third stages, and then the heat is supplied to the outer zone of the building.

[0085] Mode three - outer zone heating and inner zone cooling, and the cooling demand of the inner zone is relatively large

[0086] As Figure 6Fig. 3 is a schematic diagram of the third mode of operation of the hierarchical processing air conditioning system suitable for the inner and outer zones of a building according to the embodiment. In this mode, in each outer zone circulating fan unit 4, the valve on the pipe connecting first outer zone circulating air heat exchanger 41 to second circulating loop 2 and the valve on the pipe connecting second outer zone circulating air heat exchanger 42 to first circulating loop 1 are open; in each inner zone circulating fan unit 6, the valve on the pipe connecting first inner zone circulating air heat exchange channel of first inner zone circulating air three-medium heat exchanger 61 to second circulating loop 2 is closed, the valve on the pipe connecting first inner zone circulating air heat exchange channel of second inner zone circulating air three-medium heat exchanger 62 to first circulating loop 1 is closed, and the valves on the pipes connecting second inner zone circulating air heat exchange channels of first inner zone circulating air three-medium heat exchanger 61 and second inner zone circulating air three-medium heat exchanger 62 to third circulating loop 3 are open; in each inner zone fresh air fan unit 7, the valve on the pipe connecting first inner zone fresh air heat exchanger 71 to third circulating loop 3 is open, and the valves on the pipes connecting second inner zone fresh air heat exchanger 72 and third inner zone fresh air heat exchanger 73 to second circulating loop 2 and first circulating loop 1 are closed; in each outer zone fresh air fan unit 5, the valve on the pipe connecting first outer zone fresh air heat exchanger 51 to third circulating loop 3 is open, and the valves on the pipes connecting second outer zone fresh air heat exchanger 52 and third outer zone fresh air heat exchanger 53 to second circulating loop 2 and first circulating loop 1 are closed; on third circulating loop 3, the valve controlling natural energy collection device 31 is open. The outer zone circulating fan unit 4 is supplied with heat from the building after two-stage processing, and the heat source is a heat pump; because the cooling demand of the inner zone is large, there is still a cooling demand after pre-cooling the inner zone fresh air fan unit 7 and the outer zone fresh air fan unit 5, and at this time, the natural energy collection device 31 is used to supply free cooling to the inner zone circulating fan unit 6 and dissipate the excess heat; the inner zone fresh air fan unit 7 is preheated by the inner zone circulating fan unit 6 to prevent the temperature from being too low, and then the inner zone fresh air fan unit 7 is supplied into the room to provide cooling capacity for the inner zone; the outer zone fresh air fan unit 5 is preheated by the inner zone circulating fan unit 6, and because the cooling demand of the inner zone is large, the outer zone fresh air fan unit 5 has been preheated to a high temperature and does not need to be further heated in the second and third stages, and after preheating, the outer zone fresh air fan unit 5 is supplied into the outer zone to provide heat.

[0087] The hierarchical processing air conditioning system suitable for the inner and outer zones of a building according to the embodiment can realize the functions of free cooling of the inner zone and free heating of the fresh air in the embodiment 2 by adding the inner zone fresh air fan unit 7 and connecting it to the inner zone circulating fan unit 6, and can also realize the function of supplying fresh air with different parameters to the inner and outer zones. The situation that the parameters of the fresh air in the inner and outer zones can only be consistent in the embodiment 2 is avoided. For example, in the heating season, if the fresh air is uniformly processed to a high temperature state, although heat can be provided to the outer zone, the cooling load of the inner zone is also increased. After the fresh air fan unit is divided into two types of inner and outer zone, the different supply air parameters of the two can be used to simultaneously supply cooling to the inner zone and heat to the outer zone.

[0088] Embodiment 4

[0089] AsFigure 7 The diagram shown is a schematic representation of Embodiment 4 of the graded air conditioning system for indoor and outdoor zones of a building provided by the present invention. Compared with Embodiment 3, this embodiment has an air bypass device 8 on one side of the first outdoor zone circulating air heat exchanger 41 and the second outdoor zone circulating air heat exchanger 42; an air bypass device 8 on one side of the first indoor zone circulating air three-medium heat exchanger 61 and the second indoor zone circulating air three-medium heat exchanger 62; an air bypass device 8 on one side of the first indoor zone fresh air heat exchanger 71, the second indoor zone fresh air heat exchanger 72 and the third indoor zone fresh air heat exchanger 73; and an air bypass device 8 on one side of the first outdoor zone fresh air heat exchanger 51, the second outdoor zone fresh air heat exchanger 52 and the third outdoor zone fresh air heat exchanger 53.

[0090] During system operation, any heat exchanger can be controlled to work through the air bypass device 8. Furthermore, by setting the air bypass device 8, system resistance can be reduced, thereby lowering the system's transmission and distribution energy consumption.

[0091] Example 5

[0092] like Figure 8 The diagram shown is a schematic representation of Embodiment 5 of the graded air conditioning system for indoor and outdoor zones of a building provided by the present invention. Compared with Embodiment 4, in this embodiment, the first outdoor zone circulating air heat exchanger 41 adopts a three-medium heat exchanger, the second outdoor zone fresh air heat exchanger 52 adopts a three-medium heat exchanger, and the second indoor zone fresh air heat exchanger 72 adopts a three-medium heat exchanger.

[0093] The first outer zone circulating air heat exchanger 41 includes a first outer zone circulating air heat exchange channel and a second outer zone circulating air heat exchange channel. The first outer zone circulating air heat exchange channel is connected in parallel to both ends of the second cold and heat source 21 on the second circulation loop 2. The second outer zone circulating air heat exchange channel is connected in parallel to both ends of the natural energy collection device 31 on the third circulation loop 3.

[0094] The second external zone fresh air heat exchanger 52 includes a first external zone fresh air heat exchange channel and a second external zone fresh air heat exchange channel. The first external zone fresh air heat exchange channel is connected in parallel to both ends of the second cold and heat source 21 on the second circulation loop 2. The second external zone fresh air heat exchange channel is connected in parallel to both ends of the natural energy collection device 31 on the third circulation loop 3.

[0095] The second inner zone fresh air heat exchanger 72 includes a first inner zone fresh air heat exchange channel and a second inner zone fresh air heat exchange channel. The first inner zone fresh air heat exchange channel is connected in parallel to both ends of the second cold and heat source 21 on the second circulation loop 2. The second inner zone fresh air heat exchange channel is connected in parallel to both ends of the natural energy collection device 31 on the third circulation loop 3.

[0096] During the transitional seasons (spring and autumn), the three heat exchangers mentioned above employ a three-medium heat exchanger to replace medium-grade energy with natural energy. When the cooling tower water temperature or the buried pipe temperature is low, natural energy replaces the medium-grade cold source at the first outer zone circulating air heat exchanger 41, the second outer zone fresh air heat exchanger 52, the first inner zone circulating air three-medium heat exchanger 61, and the second inner zone fresh air heat exchanger 72 to handle the load. Using a three-medium heat exchanger avoids mixing with the original medium-grade energy pipeline.

[0097] Example 6

[0098] like Figure 9 The diagram shown is a schematic representation of Embodiment 6 of the graded air conditioning system applicable to the interior and exterior zones of a building, provided by the present invention. In this embodiment, compared to Embodiment 4, the third circulation loop 3 is connected to the second circulation loop 2.

[0099] During the transition season, the natural energy collected by the natural energy harvesting device 31 is fed into the medium-grade loop and the natural energy loop, achieving the function of Example 5. That is, natural energy replaces the medium-grade cold source at the first outer zone circulating air heat exchanger 41, the second outer zone fresh air heat exchanger 52, the first inner zone circulating air three-medium heat exchanger 61, and the second inner zone fresh air heat exchanger 72 to handle the load. Example 6 does not require changing the heat exchangers to three-medium heat exchangers, resulting in a simpler heat exchanger structure, but it requires shared piping, which may lead to mixing.

[0100] Example 7

[0101] The present invention also provides a control method based on the above-mentioned graded air conditioning system applicable to indoor and outdoor areas of a building, comprising:

[0102] The preset outdoor ambient temperature threshold range is T1 to T2. When the temperature is below T1, it is winter; when the temperature is between T1 and T2, it is the transition season (spring and autumn); when the temperature is above T2, it is summer. The preset indoor cooling demand threshold is G0. The G0 value can be set according to changes in demand. When the cooling demand value is below G0, it indicates low cooling demand; when the cooling demand value is above G0, it indicates high cooling demand.

[0103] Collect outdoor ambient temperature signal T, obtain cooling demand value signal G, compare the collected outdoor ambient temperature signal T with T1 and T2 respectively, and compare G with G0;

[0104] When T is higher than T2, it is summer. The first cold and heat source 11, the second cold and heat source 21 and the natural energy collection device 31 are turned on. There are three types of circulating media in the system. The circulating air is processed in two stages by medium-grade energy (second cold and heat source 21) and high-grade energy (first cold and heat source 11). The fresh air is processed in three stages by natural energy, medium-grade energy and high-grade energy.

[0105] When T is between T1 and T2, in the transition season, the first cold heat source 11 and the natural energy collection device 31 are opened, the second cold heat source 21 is closed, there are two kinds of circulating medium with different temperatures in the system, the circulating air is processed by the natural energy and the high-grade energy in two stages, and the fresh air is processed by the natural energy and the high-grade energy in two stages;

[0106] When T is lower than T1, in the winter season, the first cold heat source 11, the second cold heat source 21 and the natural energy collection device 31 are opened, there are three kinds of circulating medium with different temperatures in the system, the circulating air is processed by the medium-grade energy and the high-grade energy in two stages, and the fresh air is processed by the natural energy, the medium-grade energy and the high-grade energy in three stages;

[0107] When T is lower than T1 and G is less than G0 (and the system has the inner zone circulating air fan set 6), it indicates that the cooling demand of the inner zone is small in the winter season, the first cold heat source 11 and the second cold heat source 21 are opened, the waste heat recovery circuit between the inner zone circulating air fan set 6 and the outer zone fresh air fan set 5 is opened, there are three kinds of circulating medium with different temperatures in the system, the outer zone circulating air is processed by the medium-grade energy and the high-grade energy in two stages, the waste heat of the inner zone circulating air is used for preheating the fresh air, and the fresh air is processed by the inner zone waste heat, the medium-grade energy and the high-grade energy in three stages;

[0108] When T is lower than T1 and G is greater than G0 (and the system has the inner zone circulating air fan set 6), it indicates that the cooling demand of the inner zone is large in the winter season, the first cold heat source 11, the second cold heat source 21 and the natural energy collection device 31 are opened, the waste heat recovery circuit between the inner zone circulating air fan set 6 and the outer zone fresh air fan set 5 is opened, the outer zone circulating air is processed by the medium-grade energy and the high-grade energy in two stages, the waste heat of the inner zone circulating air is used for preheating the fresh air and dissipating to the natural energy, and the outer zone fresh air is processed by the inner zone waste heat;

[0109] When T is lower than T1 and G is less than G0 (and the system has the inner zone circulating air fan set 6 and the inner zone fresh air fan set 7), it indicates that the cooling demand of the inner zone is small in the winter season, the first cold heat source 11 and the second cold heat source 21 are opened, the waste heat recovery circuit between the inner zone circulating air fan set 6 and the outer zone fresh air fan set 5 and the inner zone fresh air fan set 7 is opened, there are three kinds of circulating medium with different temperatures in the system, the outer zone circulating air is processed by the medium-grade energy and the high-grade energy in two stages, the waste heat of the inner zone circulating air is used for preheating the outer zone fresh air and the inner zone fresh air, the inner zone fresh air is processed by the inner zone waste heat only, and the outer zone fresh air is processed by the inner zone waste heat, the medium-grade energy and the high-grade energy in three stages;

[0110] When T is lower than T1 and G is greater than G0 (and the system has the inner zone circulating fan group 6 and the inner zone fresh air fan group 7), the first cold and heat source 11, the second cold and heat source 21 and the natural energy collection device 31 are opened, the waste heat recovery loop between the inner zone circulating fan group 6 and the outer zone fresh air fan group 5 and the inner zone fresh air fan group 7 is opened, the outer zone circulating air is processed in two stages by the medium-grade energy and the high-grade energy, the waste heat of the inner zone circulating air is used for preheating the outer zone fresh air and the inner zone fresh air and is dissipated to the natural energy, the inner zone fresh air is processed by the inner zone waste heat, and the outer zone fresh air is processed by the inner zone waste heat.

[0111] As can be known from the above description of the embodiments, the control method of the hierarchical processing air conditioning system for the inner and outer zones of a building according to the embodiments reduces the energy grade corresponding to part load by applying the natural energy and processing the circulating air and the fresh air in two stages, improves the energy efficiency when the corresponding energy grade is generated, applies the inner zone waste heat to preheat the fresh air in the heating season, realizes energy heat recovery between the circulating air system and the fresh air system, and processes the excess waste heat by the natural energy, thereby providing a solution for realizing an efficient and energy-saving air conditioning system.

[0112] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, but not to limit the same; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that the technical solutions recorded in the foregoing embodiments can still be modified, or some technical features can be replaced by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A graded air conditioning system suitable for indoor and outdoor areas of a building, characterized in that, include: A first circulation loop, wherein a first cold or heat source is provided on the first circulation loop; A second circulation loop is provided, wherein a second cold and heat source is provided on the second circulation loop, and the quality of the second cold and heat source is lower than that of the first cold and heat source; The third circulation loop is equipped with a natural energy collection device for collecting natural energy. An external zone circulating fan unit includes an external zone circulating fan, a first external zone circulating air heat exchanger, and a second external zone circulating air heat exchanger. The external zone circulating fan drives air to exchange heat with the first and second external zone circulating air heat exchangers. The first external zone circulating air heat exchanger is connected in parallel to both ends of the second heat source and cold source in the second circulation loop, and the second external zone circulating air heat exchanger is connected in parallel to both ends of the first heat source and cold source in the first circulation loop. An external zone fresh air handling unit includes an external zone fresh air fan, a first external zone fresh air heat exchanger, a second external zone fresh air heat exchanger, and a third external zone fresh air heat exchanger. The external zone fresh air fan drives air to exchange heat with the first, second, and third external zone fresh air heat exchangers. The first external zone fresh air heat exchanger is connected in parallel to both ends of the natural energy harvesting device in the third circulation loop. The second external zone fresh air heat exchanger is connected in parallel to both ends of the second cold and heat source in the second circulation loop. The third external zone fresh air heat exchanger is connected in parallel to both ends of the first cold and heat source in the first circulation loop. An internal zone circulating fan unit includes an internal zone circulating fan, a first internal zone circulating air three-medium heat exchanger and a second internal zone circulating air three-medium heat exchanger. The internal zone circulating fan is used to drive air to exchange heat with the first internal zone circulating air three-medium heat exchanger and the second internal zone circulating air three-medium heat exchanger. Both the first and second internal zone circulating air three-medium heat exchangers include a first internal zone circulating air heat exchange channel and a second internal zone circulating air heat exchange channel. The first internal zone circulating air heat exchange channel of the first internal zone circulating air three-medium heat exchanger is connected in parallel to both ends of the second cold and heat source on the second circulation loop. The second internal zone circulating air heat exchange channel of the first internal zone circulating air three-medium heat exchanger is connected in parallel to both ends of the natural energy harvesting device on the third circulation loop. The first internal zone circulating air heat exchange channel of the second internal zone circulating air three-medium heat exchanger is connected in parallel to both ends of the first cold and heat source on the first circulation loop. The second internal zone circulating air heat exchange channel of the second internal zone circulating air three-medium heat exchanger is connected in parallel to both ends of the natural energy harvesting device on the third circulation loop.

2. The graded air conditioning system applicable to indoor and outdoor areas of a building according to claim 1, characterized in that, It also includes an internal zone fresh air unit, which includes an internal zone fresh air fan, a first internal zone fresh air heat exchanger, a second internal zone fresh air heat exchanger, and a third internal zone fresh air heat exchanger. The internal zone fresh air fan is used to drive air to exchange heat with the first internal zone fresh air heat exchanger, the second internal zone fresh air heat exchanger, and the third internal zone fresh air heat exchanger. The first inner zone fresh air heat exchanger is connected in parallel to both ends of the natural energy collection device on the third circulation loop, the second inner zone fresh air heat exchanger is connected in parallel to both ends of the second cold and heat source on the second circulation loop, and the third inner zone fresh air heat exchanger is connected in parallel to both ends of the first cold and heat source on the first circulation loop.

3. The graded air conditioning system applicable to indoor and outdoor areas of a building according to claim 2, characterized in that, The first external zone circulating air heat exchanger includes a first external zone circulating air heat exchange channel and a second external zone circulating air heat exchange channel. The first external zone circulating air heat exchange channel is connected in parallel to both ends of the second cold and heat source on the second circulation loop. The second external zone circulating air heat exchange channel is connected in parallel to both ends of the natural energy collection device on the third circulation loop. The second external zone fresh air heat exchanger includes a first external zone fresh air heat exchange channel and a second external zone fresh air heat exchange channel. The first external zone fresh air heat exchange channel is connected in parallel to both ends of the second cold and heat source on the second circulation loop. The second external zone fresh air heat exchange channel is connected in parallel to both ends of the natural energy collection device on the third circulation loop. The second inner zone fresh air heat exchanger includes a first inner zone fresh air heat exchange channel and a second inner zone fresh air heat exchange channel. The first inner zone fresh air heat exchange channel is connected in parallel to both ends of the second cold and heat source on the second circulation loop. The second inner zone fresh air heat exchange channel is connected in parallel to both ends of the natural energy collection device on the third circulation loop.

4. The graded air conditioning system applicable to indoor and outdoor areas of a building according to claim 2, characterized in that, The third loop is connected to the second loop.

5. The graded air conditioning system applicable to indoor and outdoor areas of a building according to claim 2, characterized in that, A circulation pump is installed on the main pipeline connecting the inner zone circulation fan unit in the third circulation loop.

6. The graded air conditioning system applicable to indoor and outdoor areas of a building according to claim 2, characterized in that, An air bypass device is provided on one side of the first outer zone circulating air heat exchanger and the second outer zone circulating air heat exchanger; An air bypass device is provided on one side of the first outer zone fresh air heat exchanger, the second outer zone fresh air heat exchanger, and the third outer zone fresh air heat exchanger; An air bypass device is provided on one side of the first inner zone circulating air three-medium heat exchanger and the second inner zone circulating air three-medium heat exchanger. An air bypass device is provided on one side of each of the first inner zone fresh air heat exchanger, the second inner zone fresh air heat exchanger, and the third inner zone fresh air heat exchanger.

7. The graded air conditioning system applicable to indoor and outdoor zones of a building according to any one of claims 1-6, characterized in that, Each of the first, second, and third circulation loops is equipped with a circulation pump.

8. A control method for a graded air conditioning system applicable to indoor and outdoor zones of a building, based on any one of claims 1-7, characterized in that, include: The outdoor ambient temperature threshold range is preset to T1~T2, and the indoor cooling demand threshold is preset to G0. Collect the outdoor ambient temperature signal T to obtain the cooling demand signal G; When T is higher than T2, the first cold and heat source, the second cold and heat source, and the natural energy collection device are turned on. When T is between T1 and T2, turn on the first heat source and the natural energy collection device, and turn off the second heat source. When T is lower than T1, the first cold and heat source, the second cold and heat source, and the natural energy collection device are turned on. When T is lower than T1 and G is less than G0, the first cold and heat source and the second cold and heat source are turned on, and the waste heat recovery loop between the inner zone circulating fan unit and the outer zone fresh air unit is turned on. When T is lower than T1 and G is greater than G0, the first cold and heat source, the second cold and heat source and the natural energy collection device are turned on, and the waste heat recovery loop between the inner zone circulating fan unit and the outer zone fresh air unit is turned on.

9. The control method for a graded air conditioning system applicable to indoor and outdoor zones of a building according to claim 8, characterized in that, The graded air conditioning system applicable to the interior and exterior zones of a building also includes an interior zone fresh air unit; The method further includes: When T is lower than T1 and G is less than G0, the first cold and heat source and the second cold and heat source are turned on, and the waste heat recovery loop between the inner zone circulating fan unit and the outer zone fresh air unit and the inner zone fresh air unit is turned on. When T is lower than T1 and G is greater than G0, the first cold and heat source, the second cold and heat source and the natural energy collection device are turned on, and the waste heat recovery loop between the inner zone circulating fan unit and the outer zone fresh air unit and the inner zone fresh air unit is turned on.

Images