CN103712255A - Seasonal solar energy-phase change energy accumulation graded energy-releasing heating system and method - Google Patents

Abstract

The invention belongs to the field of interseasonal energy storage heating, in particular to an interseasonal solar energy-phase change energy storage hierarchical release energy heating system and method. The system mainly includes solar collectors, phase change heat exchangers, heating modules, and heat exchangers, and all components are connected together through pipelines, valves, and circulating pumps. In the non-heating season, the system of the present invention stores solar heat energy in different temperature phase change materials that can realize stable supercooling, so that it can be left still in a supercooled liquid state; in the heating season, direct heat exchange between the heat medium water and the heat collector can be realized There are two modes of providing heat load and direct heat exchange between heat medium water and phase change heat exchanger to provide heat load, and different temperature phase phase change material units are triggered to solidify and release energy according to different stages of load grading. This system uses cross-seasonal phase change heat storage and graded energy release to provide winter heat load ideas. It has the characteristics of large phase change latent heat, relatively stable heat release temperature, and graded adjustment. It has broad application prospects in cross-season energy storage heating systems. .

Description

A cross-seasonal solar energy-phase change energy storage graded release energy heating system and method

technical field

The invention belongs to the field of interseasonal energy storage heating, in particular to an interseasonal solar energy-phase change energy storage hierarchical release energy heating system and method.

Background technique

With the improvement of people's requirements for residential comfort, low-temperature floor heating technology in winter is widely used in civil buildings because of its good thermal comfort and hygienic conditions. Ordinary heating hot water is mainly obtained by heat exchange of boilers or thermal power plants, relying on conventional energy sources such as coal and electricity.

As the most common seasonal and intermittent renewable energy in nature, solar thermal energy is also gradually applied to floor heating. According to the technical regulations of ground radiant heating, low-temperature hot water ground radiant heating uses hot water not higher than 60°C as the heating medium, which can constitute a solar low-temperature hot water floor radiation system. The solar heat storage system across seasons can realize the transfer of solar thermal energy from summer to winter, and solve the technical bottleneck of heat loss in summer and winter. At present, in the existing cross-seasonal energy storage and heat pump heating systems, the main energy storage media mainly include sensible heat storage such as hot water, gravel-water, soil and aquifers to store solar energy in summer, and the above forms have large thermal storage devices. , low heat storage efficiency and other issues, further research and design of solar energy seasonal phase change heat storage heat pump system, use phase change heat storage materials to store solar thermal energy in summer, and use heat pump system to extract heat stored in phase change materials (PCM) in heating season There are still problems such as large cross-seasonal heat dissipation losses of the heat storage device.

In order to more effectively improve the utilization rate of solar heat and improve the system device, the present invention proposes to use different temperature phase change materials (heat storage exchangers) to store supercooled heat across seasons, and release the corresponding temperature PCM latent heat and The heating medium heat exchange runs the heating mode.

Phase change materials (PCM) can be divided into high temperature (greater than 250°C), medium temperature (100--250°C) and low temperature (less than 100°C) energy storage materials according to the range of phase change temperature. This system is suitable for low-temperature energy storage phase change materials with large thermal conductivity, large phase change latent heat, large supercooling degree, and high energy density. The phase change temperature of the ideal phase change material required in the system is the heating heat The specific temperature of the media water inlet temperature limit.

Contents of the invention

The purpose of the present invention is to use inter-seasonal phase change materials to combine subcooled energy storage and graded energy release with floor heating systems, and adjust the seasonal peak-valley distribution of solar energy through inter-seasonal storage/radiation to improve the effective utilization of solar energy. During the non-heating period, the solar thermal energy collected by the solar collector is stored in different temperature phase change materials with a large supercooling degree and stable supercooling; Means such as local low temperature trigger the supercooled heat storage unit to solidify and release heat in stages.

Aiming at the deficiencies of the prior art, the present invention provides a cross-seasonal solar energy-phase change energy storage graded release energy heating system and method.

A cross-seasonal solar energy-phase change energy storage graded release energy heating system, the phase change heat exchanger in the heating system is composed of a plurality of PCM energy storage units connected in parallel, and each PCM energy storage unit is installed at both ends Control valve; each PCM energy storage unit is composed of 1 or more PCM layers and 2 or more heat medium water layers, wherein the outermost layers are all heat medium water layers, and the PCM layers and heat medium water layers The layers are arranged alternately and at intervals, and the PCM layer is an airtight structure; in each of the PCM energy storage units, each heat medium water layer communicates with the control valves arranged at both ends of the PCM energy storage unit; each of the PCM energy storage units The energy storage units are respectively connected to the trigger device; the phase change heat exchanger uses more than two PCM materials with different phase change temperature levels, and the PCM materials used in the PCM layer in a single PCM energy storage unit are the same;

In the heating system, the solar heat collector, the third valve, the heat exchanger, the fourth valve, the heat collecting circulation pump and the solar heat collector are sequentially connected through pipelines to form a closed loop; wherein, the solar heat collector The water inlet end is connected to the heat collection circulation pump through pipelines, and the heat collection circulation pump is respectively connected to the first valve, the fourth valve and the fifth valve through pipelines; the water outlet end of the solar heat collector is respectively connected to the second valve It is connected with the third valve through a pipeline, and the second valve is connected with the third valve through a pipeline;

One end of the phase change heat exchanger in the heating system is connected to the fifth valve and the seventh valve through pipelines, and the other end is connected to the sixth valve through pipelines; the sixth valve is connected to the first valve, the The second valve and the tenth valve are connected through pipelines; the fifth valve is connected with the first valve, the fourth valve and the seventh valve through pipelines; the first valve is connected with the second valve, the fourth valve and the seventh valve respectively The ten valves are connected through pipelines; the second valve is connected with the tenth valve through pipelines; the seventh valve is connected with the eighth valve and the water outlet of the heating module through pipelines; the tenth valve is connected with the ninth valve respectively The valve and the heating circulation pump are connected through pipelines;

In the heating system, the heat exchanger, the ninth valve, the heating circulation pump, the heating module, the eighth valve and the heat exchanger are connected through pipelines in sequence to form a closed circulation loop; wherein the heating circulation pump is connected to the heating module The water end is connected through a pipeline, and the eighth valve is connected with the water outlet of the heating module through a pipeline;

The solar heat collector, the second valve, the sixth valve, the phase change heat exchanger, the fifth valve, the heat collecting circulation pump and the solar heat collector are connected in sequence through pipelines to form a closed loop.

The phase-change heat exchanger, the sixth valve, the tenth valve, the heating circulation pump, the heating module, the seventh valve and the phase-change heat exchanger are sequentially connected through pipelines to form a closed loop.

A pressure gauge and a thermometer are respectively arranged on the water outlet pipeline of the solar heat collector.

A pressure gauge is respectively arranged on the pipelines at both ends of the phase change heat exchanger, and a thermometer is respectively arranged on the pipelines at both ends of the phase change heat exchanger.

A pressure gauge and a thermometer are respectively set on the water inlet pipeline of the heat collection module; a pressure gauge and a thermometer are respectively set on the water outlet pipeline of the heat collection module.

The PCM material used in the multiple PCM energy storage units is a phase change material with the characteristics of large thermal conductivity, large phase change latent heat, large degree of supercooling, and high energy density, such as NaCH ₃ COO·3H ₂ O, Na ₂ S Two or three of ₂ O ₃ ·5H ₂ O and Zn(NO ₃ ) ₂ ·6H ₂ O and the like.

The heat exchanger is a plate heat exchanger.

A heating method for a cross-seasonal solar energy-phase change energy storage graded release energy heating system, the specific method is as follows: in the non-heating season, the solar heat collector collects relatively abundant solar heat energy and transports it to the phase change storage heat exchanger with water as the medium , heating the PCM material to make it phase change heat storage (heating stage) to meet the use of solar energy across seasons; when the solar energy is sufficient in the heating season, the solar collector directly exchanges heat with the heat medium water through the heat exchanger to directly provide heat to the heating module The heat load is used for heating (the phase change heat exchanger can be charged and stored at the same time); when the solar energy is insufficient in the heating season, the solar collector is turned off, and the heat load is completely provided by the phase change heat exchanger.

During the heating and severe cold period, phase change heat exchangers are used for graded energy release. The specific method is: store PCM materials with different phase change temperature levels in phase change heat exchangers, and use graded energy release to control inter-stage PCM units. The number of heating system adjustment methods, so as to continuously meet the heating module heat load demand.

Use the supercooling characteristics of PCM materials to realize cross-season heat storage, that is, use PCM materials to have stable supercooling properties in an environment with suitable and constant temperature, and realize the liquid static stage of PCM materials cross-seasonal energy storage. The specific method is: The solar heat energy collected by the collector is transported to the phase change heat exchanger with water as the medium, and the PCM material is heated to make the phase change heat storage. The PCM material absorbs heat and melts and is in an overheated state, and then naturally cools it to the ambient temperature. Keep in a supercooled liquid state.

By determining the form of the PCM energy storage unit, a modular phase-change heat exchanger that matches the heating end is established; according to the heat load demand at different stages of the heating season, PCM materials with different temperature levels are selected, and the heat load is graded according to the stage. The heating mechanism of the temperature-level PCM energy storage unit, according to the change of the heat load in the same stage, establishes a load adjustment method to control the number of PCM energy storage units between stages, so as to realize the adjustment of the heat transfer amount of the heat medium water. The specific method is: PCM materials at different temperature levels are stored in different PCM energy storage units; during heating and severe cold periods, the use of PCM energy storage units at different temperature levels is triggered according to the periodic changes in the required heat load.

At the beginning and end of the heating season, the solar collector directly provides heat load to the heating module, and at the same time, it can continue to store heat in the phase change heat exchanger.

The beneficial effects of the present invention are:

The system and method of the present invention make full use of solar natural energy, alleviate the dependence on conventional energy, utilize the stable supercooling characteristics of the phase change material, and realize the liquid static stage of the phase change material's cross-seasonal energy storage, thereby slowing down the heat storage device's crossover. The problem of large seasonal heat loss. In addition, due to the use of different phase change temperature positions and the relatively stable output temperature of PCM latent heat, the water temperature at the inlet of the buried pipe of the heating module can be controlled accordingly to achieve a graded energy release effect on the heating system. Phase change material energy storage has the advantages of small size, large latent heat, and easy modular implementation. Under the condition of meeting the thermal load of the room, the use of clean energy to achieve stable heating has good energy saving and economic benefits.

Description of drawings

Fig. 1 is the schematic diagram of device structure of the present invention;

Fig. 2 is a structural schematic diagram of a PCM energy storage unit of the present invention (only four layers of PCM layers are shown in the figure, and in practical applications, the number of PCM layers can be 1, 2, ..., n);

Fig. 3 is a schematic diagram of a three-dimensional structure of a PCM energy storage unit of the present invention (only four PCM layers are shown in the figure);

Labels in the figure: 1—the first valve, 2—the second valve, 3—the third valve, 4—the fourth valve, 5—the fifth valve, 6—the sixth valve, 7—the seventh valve, 8—the eighth valve Valve, 9—the ninth valve, 10—the tenth valve, a—a valve, b—b valve, c—c valve, d—d valve, 11—solar collector, 12—phase change heat exchanger, 13—heating module, 14—heat exchanger, 15—heat collection circulation pump, 16—heat supply circulation pump, 17—PCM energy storage unit, P1—first pressure gauge, T1—first thermometer, P2—second pressure Gauge, T2—second thermometer, P3—third pressure gauge, T3—third thermometer, P4—fourth pressure gauge, T4—fourth thermometer, P5—fifth pressure gauge, T5—fifth thermometer, h1—PCM The height of the water layer in the energy storage unit, h2—the height of the PCM layer in the PCM energy storage unit, W—the width of the PCM energy storage unit, and L—the length of the PCM energy storage unit.

Detailed ways

The present invention provides a cross-seasonal solar energy-phase change energy storage graded release energy heating system and method. The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

A cross-seasonal solar energy-phase change energy storage graded release energy heating system, the phase change heat exchanger 12 in the heating system is composed of a plurality of PCM energy storage units 17 connected in parallel, and two of each PCM energy storage unit 17 Each PCM energy storage unit 17 is composed of 1 or more PCM layers and 2 or more heat medium water layers, wherein the outermost layers are all heat medium water layers, and the PCM layers Alternately connected to the heat medium water layer, the PCM layer is an airtight structure; in each of the PCM energy storage units 17, each heat medium water layer communicates with the control valves arranged at both ends of the PCM energy storage unit 17 Each of the PCM energy storage units 17 is connected to the trigger device respectively; the phase change heat exchanger 12 uses more than two PCM materials with different phase change temperature positions, and the PCM used in the PCM layer in the single PCM energy storage unit 17 same material;

In the heating system, the solar heat collector 11, the third valve 3, the heat exchanger 14, the fourth valve 4, the heat collecting circulation pump 15 and the solar heat collector 11 are sequentially connected through pipelines to form a closed loop; wherein, The water inlet of the solar heat collector 11 is connected to the heat collecting circulating pump 15 through pipelines, and the heat collecting circulating pump 15 is connected to the first valve 1, the fourth valve 4 and the fifth valve 5 through pipelines respectively; The water outlet of the solar heat collector 11 is respectively connected to the second valve 2 and the third valve 3 through pipelines, and the second valve 2 is connected to the third valve 3 through pipelines;

One end of the phase change heat exchanger 12 in the heating system is connected to the fifth valve 5 and the seventh valve 7 through pipelines, and the other end is connected to the sixth valve 6 through pipelines; the sixth valve 6 is connected to the The first valve 1, the second valve 2 and the tenth valve 10 are connected through pipelines; the fifth valve 5 is connected with the first valve 1, the fourth valve 4 and the seventh valve 7 through pipelines; the first The valve 1 is connected to the second valve 2, the fourth valve 4 and the tenth valve 10 through pipelines; the second valve 2 is connected to the tenth valve 10 through pipelines; the seventh valve 7 is connected to the eighth valve 8 is connected to the water outlet of the heating module 13 through pipelines; the tenth valve 10 is connected to the ninth valve 9 and the heating circulation pump 16 through pipelines;

In the heating system, the heat exchanger 14, the ninth valve 9, the heating circulation pump 16, the heating module 13, the eighth valve 8 and the heat exchanger 14 are connected in sequence through pipelines to form a closed circulation loop; wherein the heating The circulating pump 16 is connected to the water inlet end of the heating module 13 through a pipeline, and the eighth valve 8 is connected to the water outlet end of the heating module 13 through a pipeline;

The solar heat collector 11, the second valve 2, the sixth valve 6, the phase change heat exchanger 12, the fifth valve 5, the heat collection circulation pump 15 and the solar heat collector 11 are connected in sequence through pipelines to form a closed loop loop.

The phase-change heat exchanger 12, the sixth valve 6, the tenth valve 10, the heating circulation pump 16, the heating module 13, the seventh valve 7 and the phase-change heat exchanger 12 are sequentially connected through pipelines to form a closed loop loop.

A pressure gauge P1 and a thermometer T1 are respectively arranged on the water outlet pipeline of the solar heat collector 11 .

A pressure gauge (P4, P5) is respectively arranged on the two ends of the phase change heat exchanger 12, and a thermometer (T4, T5) is respectively arranged on the two ends of the phase change heat exchanger 12.

A pressure gauge P2 and a thermometer T2 are respectively set on the water inlet pipeline of the heat collection module 13 ; a pressure gauge P3 and a thermometer T3 are respectively set on the water outlet pipeline of the heat collection module 13 .

The PCM materials used in the plurality of PCM energy storage units 17 are phase change materials with large thermal conductivity, large latent heat of phase change, large degree of supercooling, and high energy density, such as NaCH ₃ COO 3H ₂ O, Na- Two or three of ₂ S ₂ O ₃ .5H ₂ O and Zn(NO ₃ ) ₂ .6H ₂ O and the like.

The heat exchanger 14 is a plate heat exchanger.

In the non-heating season, use the solar collector 11 to store heat for the phase change heat exchanger 12; at the beginning and end of the heating season, the solar collector 11 directly provides heat load to the heating module 13, and can also store heat for the phase change heat exchanger 12 for heating; heating during the severe cold period, the heat load of the heating module 13 is completely provided by the phase change heat exchanger 12 . The core of this system is the step-by-step energy release part of cross-seasonal supercooled energy storage, specifically, phase change materials with different phase change temperature levels (for example, the phase change material with three temperature levels can be PCM-1NaCH ₃ COO·3H ₂ O , PCM-2Na- ₂ S ₂ O ₃ 5H ₂ O, PCM-3Zn(NO ₃ ) ₂ 6H ₂ O, but not limited to these phase change materials) are stored in the phase change heat exchanger 12, using graded energy release . Control the number of PCM energy storage units 17 between levels (according to the difference in heat load required in a certain stage of heating in different regions, the heat load can be satisfied by the number of different PCM energy storage units 17, wherein the PCM layer in the PCM energy storage unit 17 The number can be 1, 2, ..., n, etc., as shown in Figure 2 and 3, the PCM energy storage unit 17 (PCM layer is four layers) heating system adjustment method, so as to continuously meet the heating module heat load demand.

Using the supercooling characteristics of phase change materials to realize cross-season heat storage, after thermal analysis and testing of most hydrated salt phase change materials, it is found that when the melted hydrated salt is cooled to the theoretical phase change point, crystallization often does not occur , to continue to drop a few degrees to tens of degrees. This system is to use the stable supercooling properties of phase change materials in an environment with a suitable and relatively constant temperature (such as a basement), to realize the liquid static stage of phase change materials' energy storage across seasons. Specifically, the solar thermal energy collected by the solar collector 11 is transported to the phase change heat exchanger 12 with water as the medium, and the phase change material is heated to make it phase change and store heat (heating stage). Superheated state, and then it is naturally cooled to ambient temperature, maintaining a supercooled liquid state.

By determining the form of the phase change heat storage unit, a modular phase change material phase change heat storage exchanger 12 matching the heat supply terminal is established. As shown in Figure 1, according to the room load demand in different stages of the heating season, phase change materials with different temperature levels (phase change temperature) are selected, and a heating mechanism that triggers the corresponding temperature level PCM energy storage unit 17 according to the stage load classification is established. For the change of heat load in a stage, a load adjustment method for controlling the number of PCM energy storage units 17 between stages is established, so as to realize the adjustment of the heat exchange amount of the medium water. Specifically, different phase change temperature phase change materials (such as PCM-1, PCM-2, . . . , PCM-m, etc.) are stored in different PCM energy storage units 17 respectively. During the heating and severe cold period, PCM energy storage units 17 with different temperature levels are triggered to be used according to the staged change of the required heat load. When the heat load is higher, the higher temperature phase change material is triggered to release energy for heat supply, and when the load is lower, the lower temperature phase change material is triggered to release energy for heat supply. Taking Beijing as an example, the average outdoor temperature is about 0°C, and the required average heat load is about 40W/m ² , which can trigger a lower temperature PCM-2Na ₂ S ₂ O ₃ ·5H ₂ O (not limited to this phase change material ) heat release and heat exchange. When the average outdoor temperature is about -4°C and the required average heat load is about 50W/m ² , it can trigger heat release and heat exchange at higher temperature PCM-1NaCH ₃ COO·3H ₂ O (not limited to this phase change material). In this system, adopting the hierarchical energy release method (such as PCM-1, PCM-2, PCM-3 at different temperature levels, etc.) and controlling the number of PCM energy storage units 17 between stages (heat release stage) can continuously meet the thermal requirements of the heating module 13. load demand.

Example 1

This embodiment provides a cross-seasonal solar energy-phase change energy storage hierarchical release energy heating system and method. The device structure of the system is shown in Figure 1, and the system is in different operating modes in different periods. The main operating modes are: heat storage mode, solar direct heating mode, and PCM heat release heating mode.

The PCM energy storage unit 17 model used in the system suggests that the number of PCM layers n be 20-30 layers;

Suggested size parameters of cross section L and W: 1000mm (length L) * 600mm (width W);

Suggested size parameters for longitudinal sections h1 and h2: height of the middle airtight structure (h2=50mm), place PCM material;

The height of the upper and lower floors (h1=20mm) flows through the heat medium water.

The whole system (as shown in Figure 1) can realize three operation modes throughout the year. The specific operation process (take the graded adjustment of two temperature PCM materials as an example) is as follows:

1. Heat storage cycle in non-heating season: the second valve 2, the sixth valve 6, the fifth valve 5, the control valves at both ends of the PCM energy storage unit 17 and the heat collection circulation pump 15 are all turned on, and the heat flowing through the solar collector After heating up, the heat medium water passes through the sixth valve 6, flows through the phase change heat exchanger 12 (the PCM energy storage units 17 are turned on one by one for heating), and flows back to the solar collector through the fifth valve 5 and the heat collection circulation pump 15 11.

2. In the heating season, when the sun’s thermal energy is abundant and the heat load of the room is small, the outdoor temperature is about 3-10°C (at the beginning and end of heating, such as in Beijing, it is usually the first half month before the heating starts and the second half month before the end of the heating, that is, the outdoor When the average temperature is about 6°C), the third valve 3, the fourth valve 4, and the heat collecting circulation pump 15 are all turned on to complete the first circulation system A; the ninth valve 9, the eighth valve 8, and the heating circulation pump 16 are turned on, Complete the second circulatory system B; the A circulatory system and the B circulatory system exchange heat through the plate heat exchanger 14 to realize heat supply to the floor heating module 13;

When the solar thermal energy is abundant, the heat collection of the collector can meet the heating demand of the room, and the outlet water temperature of the collector is 4°C or higher than the corresponding phase transition temperature, the second valve 2, the sixth valve 6, and the second valve can be opened at the same time. The fifth valve 5 and the control valves at both ends of the PCM energy storage unit 17 realize the heat storage cycle of the phase change heat accumulator.

3. In the heating season, when the solar radiation is low and the heat load demand of the room is large (heating cold period), stop using the solar hot water collector 11 and the plate heat exchanger 14, the seventh valve 7, the sixth valve 6, Both the tenth valve 10 and the heat supply circulation pump 16 are turned on; the heat medium water exchanges heat with the phase change heat exchanger 12 and then flows into the floor heating module 13 through the tenth valve 10 and the heat supply circulation pump 16, and the seventh valve 7 Flow back to the phase change storage heat exchanger 12 to complete heating. The heat load required by the room is relatively small, and when the outdoor temperature is about -3 to 5°C (for example, the Beijing area recommends the first half of December and the second half of February, that is, the average outdoor temperature is about 0°C, and the average heat required When the load is about 40W/ ^m2 ), open the control valves (c and d valves) at both ends of the lower temperature PCM energy storage unit 17, and trigger the lower temperature PCM material by means of mechanical vibration, electric field, magnetic field, ultrasonic wave or local low temperature. Release heat (for example, PCM-2 can use Na ₂ S ₂ O ₃ 5H ₂ O), so that the heat medium water can exchange heat with the PCM material with a lower phase transition temperature; when the heat load required by the room is large, the outdoor temperature is about When the temperature is -10-1°C (for example, mid-December to mid-February is recommended in Beijing, that is, the average outdoor temperature is about -4°C, and the required average heat load is about 50W/m ² ), turn on the higher temperature PCM storage The control valves (valve a, b) at both ends of the energy unit 17 trigger the heat release of higher temperature PCM materials (such as PCM-1 can use NaCH ₃ COO 3H ₂ O), so that the heat medium water and PCM with higher phase transition temperature Material heat transfer.

Claims (10)

1. across solar energy-phase-changing energy-storing classification in season, release energy heating system for one kind, it is characterized in that: in described heating system, phase transformation is held heat exchanger (12) by a plurality of PCM Storage Units (17) formation in parallel, and the two ends of described each PCM Storage Unit (17) all arrange by-pass valve control; Described each PCM Storage Unit (17) consists of one or more PCM layers and 2 or a plurality of heating agent water layer, and wherein outermost layer is heating agent water layer, the arrangement that is connected with heating agent water layer alternate intervals of described PCM layer, and described PCM layer is closed structure; In described each PCM Storage Unit (17), each heating agent water layer all communicates with the by-pass valve control that is arranged on these PCM Storage Unit (17) two ends; Described each PCM Storage Unit (17) is connected with flip flop equipment respectively; The PCM material that heat exchanger (12) uses two or more different phase transformation potential temperatures is held in described phase transformation, and the PCM material that in single PCM Storage Unit (17), PCM layer is used is identical;

Solar thermal collector in described heating system (11), the 3rd valve (3), heat exchanger (14), the 4th valve (4), thermal-arrest circulating pump (15) are connected by pipeline successively with solar thermal collector (11), form closed loop; Wherein, described solar thermal collector (11) water inlet end is connected by pipeline with thermal-arrest circulating pump (15), and described thermal-arrest circulating pump (15) is connected by pipeline with the first valve (1), the 4th valve (4) and the 5th valve (5) respectively; Described solar thermal collector (11) water side is connected by pipeline with the 3rd valve (3) with the second valve (2) respectively, and described the second valve (2) is connected by pipeline with the 3rd valve (3);

One end that in described heating system, heat exchanger (12) is held in phase transformation is connected by pipeline with the 7th valve (7) with the 5th valve (5) respectively, and the other end is connected by pipeline with the 6th valve (6); Described the 6th valve (6) is connected by pipeline with the first valve (1), the second valve (2) and the tenth valve (10) respectively; Described the 5th valve (5) is connected by pipeline with the first valve (1), the 4th valve (4) and the 7th valve (7) respectively; Described the first valve (1) is connected by pipeline with the second valve (2), the 4th valve (4) and the tenth valve (10) respectively; Described the second valve (2) is connected by pipeline with the tenth valve (10); Described the 7th valve (7) is connected by pipeline with heating module (13) water side with the 8th valve (8) respectively; Described the tenth valve (10) is connected by pipeline with confession hot recycle pump (16) with the 9th valve (9) respectively;

Heat exchanger in described heating system (14), the 9th valve (9), confession hot recycle pump (16), heating module (13), the 8th valve (8) are connected by pipeline successively with heat exchanger (14), form closed loop; The wherein said hot recycle pump (16) that supplies is connected by pipeline with heating module (13) water inlet end, and described the 8th valve (8) is connected by pipeline with heating module (13) water side;

Described solar thermal collector (11), the second valve (2), the 6th valve (6), phase transformation are held heat exchanger (12), the 5th valve (5), thermal-arrest circulating pump (15) and by pipeline, are connected successively with solar thermal collector (11), form closed loop;

Described phase transformation is held heat exchanger (12), the 6th valve (6), the tenth valve (10), for hot recycle pump (16), heating module (13), the 7th valve (7), is held heat exchanger (12) by pipeline, be connected successively with phase transformation, forms closed loop.

2. a kind of releasing across solar energy-phase-changing energy-storing classification in season according to claim 1 can heating system, it is characterized in that: on the pipeline of described solar thermal collector (11) water side, pressure gauge and thermometer are set respectively.

3. a kind of releasing across solar energy-phase-changing energy-storing classification in season according to claim 1 can heating system, it is characterized in that: described phase transformation is held on the pipeline of heat exchanger (12) two ends a pressure gauge is set respectively, described phase transformation is held on the pipeline of heat exchanger (12) two ends a thermometer is set respectively.

4. a kind of releasing across solar energy-phase-changing energy-storing classification in season according to claim 1 can heating system, it is characterized in that: described in adopt on thermal modules (13) water inlet end pipeline pressure gauge and thermometer be set respectively; Described adopting on the pipeline of thermal modules (13) water side arranges respectively pressure gauge and thermometer.

5. a kind of releasing across solar energy-phase-changing energy-storing classification in season according to claim 1 can heating system, it is characterized in that: the PCM material using in described a plurality of PCM Storage Units (17) is NaCH ₃cOO3H ₂o, Na ₂s ₂o ₃5H ₂o and Zn (NO ₃) ₂6H ₂in O two or three.

6. a kind of releasing across solar energy-phase-changing energy-storing classification in season according to claim 1 can heating system, it is characterized in that: described heat exchanger (14) is plate type heat exchanger.

7. a kind of heating method of releasing energy heating system across solar energy-phase-changing energy-storing classification in season as described in claim 1-5 any one claim, is characterized in that, concrete grammar is as follows:

Non-heating season, utilizes solar thermal collector (11) to hold heat exchanger (12) accumulation of heat to phase transformation; Heating Season initial stage and latter stage, solar thermal collector (11) directly provides thermic load to heating module (13); Heating freeze-up, heating module (13) thermic load is held heat exchanger (12) by phase transformation completely to be provided;

At heating freeze-up, use phase transformation hold heat exchanger (12) carry out that classification releases can, concrete grammar is: the PCM material with different phase transformation potential temperatures is stored in to phase transformation and holds heat exchanger (12), adopt classification to release the heating system regulative mode of PCM Storage Unit (17) quantity between energy, controlled stage, thereby continue to meet heating module (13) different phase thermic load demand.

According to claim 7 a kind of across solar energy-phase-changing energy-storing classification in season release can heating system heating method, it is characterized in that: utilize PCM material to cross cold characteristic and realize cross-season heat-storage, utilize PCM material to have and stablized cold character under the suitable and constant environment of temperature, realize PCM material across the standing stage of liquid state of accumulation of energy in season, concrete grammar is: the solar thermal energy that solar thermal collector (11) is collected be take water and held heat exchanger (12) as medium is transported to phase transformation, heating PCM material makes it phase-transition heat-storage, PCM material heat absorption melt after in superheat state, then naturally cooled to ambient temperature, keep supercooled liquid.

According to claim 7 a kind of across solar energy-phase-changing energy-storing classification in season release can heating system heating method, it is characterized in that: by determining PCM Storage Unit (17) form, set up the modularization phase transformation matching with heat supply end and hold heat exchanger (12); According to Heating Season different phase thermic load demand, select the PCM material of different potential temperatures, foundation triggers the heat supply mechanism of corresponding potential temperature PCM Storage Unit (17) according to stage thermic load classification, according to the variation of thermic load in same stage, set up inter-stage and control the Load Regulation mode of PCM Storage Unit (17) quantity, thereby realize the adjusting to heat medium water heat exchange amount, concrete grammar is: the PCM material of different potential temperatures is stored in respectively to different PCM Storage Units (17); Heating freeze-up, according to the phasic Chang of required load of heat, triggers the PCM Storage Unit (17) that uses different potential temperatures.

According to claim 7 a kind of across solar energy-phase-changing energy-storing classification in season release can heating system heating method, it is characterized in that: latter stage at the beginning of Heating Season, solar thermal collector directly provides thermic load to heating module (13), realizes simultaneously and continues phase transformation to hold heat exchanger (12) accumulation of heat.

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