Low-temperature-difference large-span heating heat pump system
Through the multi-stage heating design of the low-temperature difference large-span temperature-enhancing heat pump system, the problem of low efficiency in low-temperature waste heat recovery and utilization is solved, and high-efficiency preparation of high-temperature water is achieved, which is suitable for the preparation of high-temperature water for domestic and industrial industries.
Patent Information
- Application Number
- CN202510639358.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-05-19
- Publication Date
- 2025-08-01
AI Technical Summary
It is difficult for existing compression heat pump systems to take into account waste heat heating and efficient heating in the recycling and utilization of low-temperature waste heat, resulting in the neglect and wasteful low-grade waste heat resources.
A low-temperature difference large-span temperature-enhancing heat pump system is adopted. Through array arrangement of multiple heat pump units, cooling heat source working fluid pipelines, circulating working fluid pipelines and heating heat source working fluid pipelines are set up to achieve multi-stage heating, and the low-grade waste heat is used to upgrade the water flow step by step to produce high-temperature water.
It realizes efficient recycling of low-grade waste heat with less heat pump units and power consumption, and prepares high-temperature water with less heat pump units, which is suitable for different thermal energy manufacturing and recycling scenarios.
Smart Images
Figure CN120403081A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the technical field of energy utilization, and more particularly, to a heat pump system with a large temperature span for heating with a low temperature difference. Background Art
[0002] The methods for heat energy equipment to produce high-temperature hot water include direct combustion to produce hot water mainly with coal-fired and gas-fired boilers, electro-thermal conversion to produce hot water, absorption conversion of solar energy to produce hot water, heat pump systems to produce hot water, etc. Among them, the compression heat pump system is recognized by the industry as the most environmentally friendly way to produce high-temperature hot water with higher heating efficiency and is widely promoted and applied in China. However, a large amount of low-grade waste heat in the current social environment is ignored and wasted, and the compression heat pump system shows a dilemma in the field of low-grade waste heat recovery and utilization, where it is difficult to combine waste heat recovery for heating and high-efficiency heating. Summary of the Invention
[0003] The problem to be solved by the present invention is how to efficiently recover low-grade waste heat for preparing hot water.
[0004] To this end, the present invention provides a heat pump system with a large temperature span for heating with a low temperature difference, including a cooling heat source working medium pipeline, a circulating working medium pipeline, a heating heat source working medium pipeline, and a plurality of heat pump subsystems. Each heat pump subsystem includes at least one heat pump unit, and a plurality of the heat pump units are arranged in an array. The cooling heat source working medium pipeline is used to provide a heat source for the leftmost heat pump unit in each row. The circulating working medium pipeline is used to connect the heat pump units in adjacent two columns in series. Among adjacent two columns, all the heat pump units in the right column are located on the circulating working medium pipeline, and the heat pump units in the left column and in the same row as the heat pump units in the right column are located on the circulating working medium pipeline. The heating heat source working medium pipeline is used to connect the rightmost heat pump units in each row in series, and the series connection order is from the row with the lowest temperature of the heat pump units to the row with the highest temperature. In each row of units, the temperature of the water in the cooling heat source working medium pipeline, the plurality of circulating working medium pipelines from left to right, and the heating heat source working medium pipeline gradually increases, and the heat pump unit is used to raise the temperature.
[0005] Optionally, the heat pump unit includes an evaporative heat exchanger, a condensing heat exchanger, a compressor, and a throttle valve. The circulating outlet of the evaporative heat exchanger, the compressor, and the circulating inlet of the condensing heat exchanger are connected in sequence. The circulating outlet of the condensing heat exchanger, the throttle valve, and the circulating inlet of the evaporative heat exchanger are connected in sequence. The hot water inlet and the hot water outlet of the evaporative heat exchanger are used for hot water to flow through. The cold water inlet and the cold water outlet of the condensing heat exchanger are used for cold water to flow through. The circulating outlet of the evaporative heat exchanger, the compressor, the circulating inlet of the condensing heat exchanger, the circulating outlet of the condensing heat exchanger, the throttle valve, and the circulating inlet of the evaporative heat exchanger are used for the refrigerant to circulate.
[0006] Optionally, the heating heat source working medium pipeline is used to connect to the heat pump unit located on the rightmost side of the circulating working medium pipeline and in the rightmost column.
[0007] Optionally, the heating heat source working medium pipeline is used to connect in sequence to the heat pump units that do not pass through the circulating working medium pipeline, or to multiple heat pump units located on different circulating working medium pipelines and in the rightmost column.
[0008] Optionally, the cooling heat source working medium pipeline includes multiple sub-pipelines, and the multiple sub-pipelines are respectively used to provide heat sources for the leftmost heat pump units in each row.
[0009] Optionally, the number of rows and columns of the heat pump units is at least one, and the number of rows and columns cannot be one at the same time.
[0010] Optionally, a circulating water tank is provided on the circulating working medium pipeline.
[0011] Optionally, a circulating water pump is also provided on the circulating working medium pipeline.
[0012] Optionally, the cooling heat source working medium pipeline, the circulating working medium pipeline, and the heating heat source working medium pipeline are all made of water pipes.
[0013] Compared with the prior art, the beneficial effects of the low-temperature difference and large-span heating heat pump system of the present invention are:
[0014] The present invention arranges multiple heat pump units in an array, for example, in m columns and n rows, where m is two and n is three, and the multiple heat pump units are arranged in two columns and three rows. The two columns of heat pump units are respectively denoted as the first column and the second column from left to right. From left to right, the number of heat pump units in each column decreases in turn. For example, the number of heat pump units in the first column is three, that is, three rows, and the three heat pump units are respectively denoted as the first heat pump unit, the second heat pump unit, and the third heat pump unit from top to bottom. The number of heat pump units in the second column is two, and the two heat pump units are respectively denoted as the fourth heat pump unit and the fifth heat pump unit from top to bottom. Then, a cooling heat source working medium pipeline, a heating heat source working medium pipeline, and a circulating working medium pipeline between adjacent two columns of heat pump units are set. In the above pipelines, within each row of units, the initial temperature of the water in the cooling heat source working medium pipeline, the circulating working medium pipeline between the first column and the second column, and the heating heat source working medium pipeline gradually increases, and is respectively denoted as the first temperature, the second temperature, and the third temperature in turn. The cooling heat source working medium pipeline with the first temperature provides water with a certain temperature as the initial heat source for the leftmost heat pump units, that is, the first heat pump unit, the second heat pump unit, and the third heat pump unit. Then, the temperature is increased through the refrigerant cycle improvement of the first heat pump unit to the third heat pump unit. The circulating working medium pipeline is arranged between adjacent two columns of heat pump units. For example, between the first column and the second column, the circulating working medium pipeline connects the heat pump units on adjacent two columns in series. All the heat pump units on the right column are arranged on the circulating working medium pipeline, and the heat pump units on the left column that are in the same row as the heat pump units on the right column are arranged on the circulating working medium pipeline. For example, between the first column and the second column, the second heat pump unit, the third heat pump unit, the fourth heat pump unit, and the fifth heat pump unit are connected in series by the same circulating working medium pipeline in turn. The water in the circulating working medium pipeline passes through the above four heat pump units in the above order and circulates. The water with the second temperature in the circulating working medium pipeline is heated by the second heat pump unit and the third heat pump unit, and the heat is brought to the fourth heat pump unit and the fifth heat pump unit, and then the temperature continues to increase after the refrigerant cycle improvement of the fourth heat pump unit and the fifth heat pump unit;The heat pump units on the rightmost side of each row of the heating heat source working medium pipelines are connected in series. The series connection order is from the row with the lowest temperature of the heat pump units to the row with the highest temperature. For example, the first heat pump unit, the fourth heat pump unit, and the fifth heat pump unit are connected in series in sequence. The water at the first temperature passes through the first heat pump unit, the fourth heat pump unit, and the fifth heat pump unit in sequence, so that the water temperature in the heating heat source working medium pipeline increases step by step, achieving a large-span temperature increase in multiple-stage temperature increases, producing water at a higher temperature. Moreover, in the present invention, the low-grade waste heat carried by the circulating working medium in the cooling heat source working medium pipeline is upgraded step by step through multiple rows of heat pump units, used to heat the working medium in the heating heat source pipeline, and the heating heat source working medium pipeline passes through the heat pump units with increasing heating temperatures in sequence, realizing the step-by-step heating of the water flow in the heating heat source working medium pipeline. That is, the heat pump units improve the quality of the heat source from left to right in each row and increase the temperature in each column, realizing the coupling technology of series and parallel connection, achieving the heat preparation technology with a larger thermal power with fewer numbers and power consumption of heat pump units, recycling the low-grade waste heat, inputting the waste heat into the water in the cooling heat source working medium pipeline, gradually increasing the temperature of the water in the heating heat source working medium pipeline, and producing high-temperature water, which can be applied to different scenarios of heat energy manufacturing or recovery and utilization. BRIEF DESCRIPTION OF THE DRAWINGS
[0015] Figure 1 One of the structural schematic diagrams of the low-temperature difference and large-span temperature increase heat pump system according to the embodiment of the present invention;
[0016] Figure 2 Structural schematic diagram of the compression heat pump unit cycle according to the embodiment of the present invention;
[0017] Figure 3 Another structural schematic diagram of the low-temperature difference and large-span temperature increase heat pump system according to the embodiment of the present invention;
[0018] Figure 4 Another structural schematic diagram of the low-temperature difference and large-span temperature increase heat pump system according to the embodiment of the present invention.
[0019] Description of the reference numerals:
[0020] 1 - heat pump unit; 101 - first heat pump unit; 102 - second heat pump unit; 103 - third heat pump unit; 104 - fourth heat pump unit; 105 - fifth heat pump unit; 2 - cooling heat source working medium pipeline; 3 - circulating working medium pipeline; 31 - circulating water tank; 32 - circulating water pump; � - heating heat source working medium pipeline; 51 - evaporation heat exchanger; 52 - condensation heat exchanger; 53 - compressor; 54 - throttle valve. [[ID=]26]DETAILED DESCRIPTION OF THE EMBODIMENTS
[0021] To make the above objects, features, and advantages of the present invention more obvious and understandable, the following detailed description of the specific embodiments of the present invention is provided in conjunction with the accompanying drawings.
[0022] It should be noted that in the description of the present invention, the orientation or positional relationship indicated by "upper", "lower", "left", "right", "top", "bottom", "front", "rear", "inner" and "outer" is based on the orientation or positional relationship shown in the drawings. This is only for the convenience of describing the present invention, rather than indicating or implying that the device referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation on the protection scope of the present invention.
[0023] The terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features.
[0024] Moreover, although the present invention is described with reference to specific embodiments, it should be understood that these embodiments are merely examples of the principles and applications of the present invention. Therefore, it should be understood that many modifications can be made to the exemplary embodiments, and other arrangements can be designed, as long as they do not deviate from the spirit and scope of the present invention defined by the appended claims. It should be understood that different dependent claims and the features in this text can be combined in a manner different from that described in the original claims. It should also be understood that the features described in connection with a single embodiment can be used in other embodiments.
[0025] To solve the above problems, as Figure 1 shown, the present invention provides a low-temperature difference and large-span heating heat pump system, which includes a cooling heat source working medium pipeline 2, a circulating working medium pipeline 3, a heating heat source working medium pipeline 4 and a plurality of heat pump subsystems. The heat pump subsystem includes at least one heat pump unit 1, and a plurality of the heat pump units 1 are arranged in an array. The cooling heat source working medium pipeline 2 is used to provide heat sources for the leftmost heat pump unit 1 in each row. The circulating working medium pipeline 3 is used to connect the heat pump units 1 in adjacent two columns in series. Among adjacent two columns, all the heat pump units 1 in the right column are located on the circulating working medium pipeline 3, and the heat pump units 1 in the left column and in the same row as the heat pump units 1 in the right column are located on the circulating working medium pipeline 3. The heating heat source working medium pipeline 4 is used to connect the heat pump units 1 located on the rightmost side in each row in series, and the series connection order is from the row with the lowest temperature of the heat pump unit 1 to the row with the highest temperature. Water flows in the cooling heat source working medium pipeline 2, the circulating working medium pipeline 3 and the heating heat source working medium pipeline 4. In each row of units, the temperature of the water in the cooling heat source working medium pipeline 2, the plurality of circulating working medium pipelines 3 from left to right and the heating heat source working medium pipeline 4 gradually increases, and the heat pump unit 1 improves the temperature through the refrigerant cycle.
[0026] In this embodiment, by arranging a plurality of heat pump units 1 in an array, for example, in m columns and n rows, where m is two and n is three, the plurality of heat pump units 1 are arranged in two columns and three rows. The two columns of heat pump units 1 are respectively denoted as the first column and the second column from left to right. From left to right, the number of heat pump units 1 on each column decreases in turn. For example, the number of heat pump units 1 on the first column is three, that is, three rows. The three heat pump units 1 are respectively denoted as the first heat pump unit 101, the second heat pump unit 102, and the third heat pump unit 103 from top to bottom. The number of heat pump units 1 on the second column is two. The two heat pump units 1 are respectively denoted as the fourth heat pump unit 104 and the fifth heat pump unit 105 from top to bottom. Then, a cooling heat source working medium pipeline 2 for flowing water, a heating heat source working medium pipeline 4, and a circulating working medium pipeline 3 between adjacent two columns of heat pump units 1 are arranged. In the above pipelines, within each row of units, the initial temperature of the water in the heating heat source working medium pipeline 4, the cooling heat source working medium pipeline 2, and the circulating working medium pipeline 3 between the first column and the second column gradually increases, and is respectively denoted as the first temperature, the second temperature, and the third temperature in turn. The cooling heat source working medium pipeline 2 with the second temperature provides water with a certain temperature for the leftmost heat pump units 1, that is, the first heat pump unit 101, the second heat pump unit 102, and the third heat pump unit 103 as the initial heat source. Then, the temperature is increased through the refrigerant cycle of the first heat pump unit 101 to the third heat pump unit 103. The circulating working medium pipeline 3 is arranged between adjacent two columns of heat pump units 1. For example, between the first column and the second column, the circulating working medium pipeline 3 connects the heat pump units 1 on adjacent two columns in series. All the heat pump units 1 on the right column are arranged on the circulating working medium pipeline 3. On the left column, the heat pump units 1 in the same row as the heat pump units 1 on the right column are arranged on the circulating working medium pipeline 3. For example, between the first column and the second column, the second heat pump unit 102, the third heat pump unit 103, the fourth heat pump unit 104, and the fifth heat pump unit 105 are connected in series by the same circulating working medium pipeline 3 in turn. The water in the circulating working medium pipeline 3 passes through the above four heat pump units 1 in the above order and circulates repeatedly. The water with the third temperature in the circulating working medium pipeline 3 is heated by the second heat pump unit 102 and the third heat pump unit 103, and the heat is brought to the fourth heat pump unit 104 and the fifth heat pump unit 105, and then the temperature continues to increase after passing through the refrigerant cycle of the fourth heat pump unit 104 and the fifth heat pump unit 105;The heating source working medium pipeline 4 is connected in series with the rightmost heat pump unit 1 in each row, and the series connection order is from the row with the lowest temperature of the heat pump unit 1 to the row with the highest temperature. For example, the first heat pump unit 101, the fourth heat pump unit 105, and the fifth heat pump unit 105 are connected in series in sequence. The water at the first temperature passes through the first heat pump unit 101, the fourth heat pump unit 104, and the fifth heat pump unit 105 in sequence, so that the water temperature in the heating source working medium pipeline 4 increases step by step, realizing a large-span temperature increase in multiple-stage temperature increases, producing water at a higher temperature. Moreover, in the present invention, the low-grade waste heat carried by the circulating working medium in the cooling source working medium pipeline 2 is upgraded step by step through multiple columns of heat pump units 1 and is used to heat the working medium in the heating source pipeline 4. The heating source working medium pipeline 4 passes through the heat pump units 1 with gradually increasing heating temperatures in sequence, realizing the step-by-step heating of the water flow in the heating source working medium pipeline 4. That is, the heat pump unit 1 improves the quality of the heat source from left to right in each row and increases the temperature in each column, realizing the coupling technology of series-parallel connection, and realizing the heat preparation technology with a larger thermal power with a smaller number and power consumption of the heat pump units 1. The low-grade waste heat is reused. The waste heat is input into the water in the cooling source working medium pipeline 2, and the water in the heating source working medium pipeline 4 is heated step by step to produce high-temperature water, which can be applied to different scenarios of heat energy manufacturing or recovery and utilization.;
[0027] Specifically, the present invention can be applied to scenarios such as using normal-temperature ambient water as a heat source to prepare high-temperature domestic water and recovering a large amount of low-grade waste heat in industry to prepare industrial-grade high-temperature working media.
[0028] Optionally, as Figure 3 shown, the heat pump unit 1 includes an evaporation heat exchanger 51, a condensation heat exchanger 52, a compressor 53, and a throttle valve 54. The circulation outlet of the evaporation heat exchanger 51, the compressor 53, and the circulation inlet of the condensation heat exchanger 52 are connected in sequence. The circulation outlet of the condensation heat exchanger 52, the throttle valve 54, and the circulation inlet of the evaporation heat exchanger 51 are connected in sequence; the hot water inlet and hot water outlet of the evaporation heat exchanger 51 are used for hot water to flow through, the cold water inlet and cold water outlet of the condensation heat exchanger 52 are used for cold water to flow through, and the circulation outlet of the evaporation heat exchanger 51, the compressor 53, the circulation inlet of the condensation heat exchanger 52, the circulation outlet of the condensation heat exchanger 52, the throttle valve 54, and the circulation inlet of the evaporation heat exchanger 51 are used for the refrigerant to circulate.
[0029] In this embodiment, by providing an evaporation heat exchanger 51 and a condensation heat exchanger 52, the evaporation heat exchanger 51 is provided with a hot water inlet, a hot water outlet, a circulation inlet and a circulation outlet, namely four ports a, b, c and d, and the condensation heat exchanger 52 is provided with a circulation inlet, a circulation outlet, a cold water inlet and a cold water outlet, namely four ports e, f, g and h. A compressor 53 is connected between port d and port e, in the direction from port d to port e. A throttle valve 54 is connected between port f and port c, in the direction from port f to port c. The evaporation heat exchanger 51 is used for the low-pressure refrigerant to absorb heat, the condensation heat exchanger 52 is used for the high-pressure refrigerant to release heat, the compressor 53 is used for compressing the refrigerant, and the throttle valve 54 is used for throttling and depressurizing the refrigerant. During operation, the refrigerant enters the evaporation heat exchanger 51 in a gas-liquid coexisting saturated phase state, absorbs heat from the hot water at a lower evaporation temperature to complete the gasification transformation process, and leaves the evaporation heat exchanger 51 in a superheated gaseous phase state and enters the compressor 53. The compressor 53 compresses the volume of the superheated gaseous refrigerant, compresses the low-pressure superheated gaseous refrigerant to a high-pressure state, and the temperature continuously rises to a high temperature state during the compression process. The compressor 53, as the power component of the heat pump unit 1, promotes the circulation of the refrigerant. The refrigerant enters the condensation heat exchanger 52 in a high-temperature, high-pressure and superheated gaseous state, releases heat to the cold water at a higher temperature to complete the liquefaction transformation process, and leaves the condensation heat exchanger 52 in a liquid phase state and enters the throttle valve 54. The throttle valve 54 throttles and expands the high-pressure liquid refrigerant to a low-pressure state by changing the valve opening. During this period, the liquid refrigerant is depressurized and partially gasified. Finally, the refrigerant returns to the evaporation heat exchanger 51 in a gas-liquid coexisting saturated phase state, and at the same time, the cold water is heated.
[0030] In this embodiment, the hot water inlet and the hot water outlet of the evaporator heat exchanger are used for hot water circulation, and the cold water inlet and the cold water outlet of the condensation heat exchanger 52 are used for cold water circulation. Specifically, the hot water inlet of the evaporation heat exchanger 51 is for hot water to enter. The evaporation heat exchanger 51 absorbs heat from the hot water by absorbing heat with low-pressure refrigerant. The cold water inlet of the condensation heat exchanger 52 is for cold water to enter. The condensation heat exchanger 52 heats the cold water by releasing heat with high-pressure refrigerant. Therefore, in the heat pump units 1 in two adjacent columns, the hot water inlet and the hot water outlet of the evaporation heat exchanger 51 in the right column of the heat pump units 1 are connected to the cold water inlet and the cold water outlet of the condensation heat exchanger 52 of the heat pump units 1 in the left column through the circulating working medium pipeline 3, so that the heat heated by the condensation heat exchanger 52 of the heat pump units 1 in the left column can be transferred to the evaporation heat exchanger 51 in the heat pump units 1 in the right column to achieve column-by-column heat transfer. In addition, it should be noted that in the heat pump units 1 in two adjacent columns, only the heat pump units 1 in the left column that are in the same row as the heat pump units 1 in the right column are located on the circulating working medium pipeline 3. That is, in the left column, only the cold water inlet and the cold water outlet of the condensation heat exchanger 52 of the heat pump units 1 that are in the same row as the heat pump units 1 in the right column are connected to the circulating working medium pipeline 3, and the cold water inlets and the cold water outlets of the condensation heat exchangers 52 of other heat pump units 1 are not connected to the circulating working medium pipeline 3.
[0031] Specifically, the heating temperature of the heat pump units 1 increases sequentially from the leftmost column to the rightmost column, and the power of the compressors 53 in the heat pump units 1 increases from left to right. By means of step-by-step temperature increase, the power distribution of the compressors 53 is made more reasonable. On the basis of ensuring the temperature increase effect, the power of the left compressors 53 is reduced, saving energy. According to the different refrigerants in the heat pump units 1, heat pump units 1 with different numbers of rows and columns can be selected. For refrigerants with high heat exchange efficiency, the number of columns of the heat pump units 1 is less.
[0032] Specifically, by connecting the hot water inlets and the hot water outlets of all the heat pump units 1 in the leftmost column, that is, the first column, to the cooling heat source working medium pipeline 2, it is convenient for the cooling heat source working medium pipeline 2 to provide hot water at the second temperature as a heat source for the heat pump units 1 in the first column. The hot water at the second temperature in the cooling heat source working medium pipeline 2 can be low-temperature hot water generated by industrial production waste heat, realizing the reuse of industrial waste heat. The cold water inlets and the cold water outlets of the condensation heat exchangers 52 on the rightmost heat pump units 1 in each row are all connected to the heating heat source working medium pipeline 4. By connecting the cold water inlets and the cold water outlets of the rightmost heat pump units 1 in each row to the heating heat source working medium pipeline 4, it is convenient to connect the rightmost heat pump units 1 in each row in sequence using the heating heat source working medium pipeline 4.
[0033] Optionally, asFigure 4 As shown, the heating source working fluid pipeline 4 is used to connect to the heat pump unit 1 located on the rightmost cycle working fluid pipeline 3 and in the rightmost column.
[0034] In this embodiment, by setting the connections of multiple heat pump units 1 in a series mode, for example, arranging the heat pump units 1 in 1 row and m columns, the series connection of multiple heat pump units 1 is achieved. The cooling source working fluid pipeline 2 passes through the leftmost heat pump unit 1, and there is a cycle working fluid pipeline 3 between adjacent two heat pump units 1. The heating source working fluid pipeline 4 only passes through the rightmost heat pump unit 1. The temperature of the rightmost heat pump unit 1 is gradually heated by the leftmost heat pump unit 1 through multiple cycle working fluid pipelines 3 and multiple heat pump units 1 in the middle to a higher temperature, and then the cold water in the heating source working fluid pipeline 4 is heated to realize cold water heating. In other embodiments, when the heat pump units are arranged in 2 rows and m columns, the heating source working fluid pipeline 4 only passes through the two rightmost heat pump units 1.
[0035] Optionally, as Figure 3 shown, the heating source working fluid pipeline 4 is used to connect in sequence to the heat pump unit 1 that does not pass through the cycle working fluid pipeline 3, or to multiple heat pump units 1 that are located on different cycle working fluid pipelines 3 and in the rightmost column. [[ID=IO]]
[0036] In this embodiment, by setting the connections of multiple heat pump units 1 in a parallel mode, for example, arranging the heat pump units 1 in n rows and 1 column, the parallel connection of multiple heat pump units 1 is achieved. The cooling source working fluid pipeline 2 and the heating source working fluid pipeline 4 respectively communicate with multiple heat pump units 1 from top to bottom in sequence, and the cold water is gradually heated through multiple heat pump units 1. It should be noted that in this embodiment, there is only one column of heat pump units 1, and there is no cycle working fluid pipeline 3 in this embodiment.
[0037] Optionally, as Figure 1 shown, the cooling source working fluid pipeline 2 includes multiple sub - pipelines, and the multiple sub - pipelines are respectively used to provide heat sources for the leftmost heat pump unit 1 in each row.
[0038] In this embodiment, the cooling source working fluid pipeline 2 may include multiple sub - pipelines. The temperatures of the multiple sub - pipelines are the same, and the number of sub - pipelines is consistent with the number of heat pump units 1 in the first column. The multiple sub - pipelines respectively supply heat to the leftmost heat pump unit 1 in each row.
[0039] Optionally, as Figure 1 and Figure 2 shown, the number of rows and columns of the heat pump unit 1 is at least one.
[0040] In this embodiment, the number of rows and columns of the heat pump units 1 can be determined according to the actual situation. A plurality of heat pump units 1 are arranged in three columns and five rows, that is, m is three and n is five. By adjusting the number and series-parallel relationship of the heat pump units 1, the span of the temperature rise of the working medium pipeline 4 of the heating heat source can be increased, so as to realize the preparation of high-temperature water and adjust the finally obtainable water temperature.
[0041] Optionally, as Figure 1 shown, a circulation water tank 31 is provided on the circulation working medium pipeline 3.
[0042] In this embodiment, by providing a circulation water tank 31 on the circulation working medium pipeline 3, the circulation water tank 31 provides circulating water flow for the circulation working medium pipeline 3.
[0043] Optionally, as Figure 1 shown, a circulation water pump 32 is further provided on the circulation working medium pipeline 3.
[0044] In this embodiment, by providing a circulation water pump 32 on the circulation working medium pipeline 3, the circulation water pump 32 drives the water flow in the circulation working medium pipeline 3 to flow between the heat pump units 1.
[0045] Optionally, the cooling heat source working medium pipeline 2, the circulation working medium pipeline 3 and the heating heat source working medium pipeline 4 are all made of water pipes.
[0046] In this embodiment, by making the cooling heat source working medium pipeline 2, the circulation working medium pipeline 3 and the heating heat source working medium pipeline 4 all made of water pipes, it is convenient for the water flow to circulate in the cooling heat source working medium pipeline 2, the circulation working medium pipeline 3 and the heating heat source working medium pipeline 4.
[0047] Specifically, by setting the cooling heat source working medium pipeline 2 to n, the number of the cooling heat source working medium pipelines 2 is the same as the number of the heat pump units 1 on the leftmost column and corresponds one by one. The n cooling heat source working medium pipelines 2 respectively provide heat sources for the n heat pump units 1, so that the first heating temperatures obtained by heating the multiple heat pump units 1 on the leftmost column are the same and are unified with the subsequent heating temperatures.
[0048] Although the present invention is disclosed as above, the protection scope of the present invention is not limited thereto. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention, and these changes and modifications will all fall within the protection scope of the present invention.
Claims
1. A low temperature difference and large-span heating heat pump system, characterized in that, It includes a cooling heat source working medium pipeline (2), a circulating working medium pipeline (3), a heating heat source working medium pipeline (4) and multiple heat pump subsystems. Each heat pump subsystem includes at least one heat pump unit (1). Multiple heat pump units (1) are arranged in an array. The cooling heat source working medium pipeline (2) is used to provide heat source for the leftmost heat pump unit (1) in each row. The circulating working medium pipeline (3) is used to connect the heat pump units (1) in adjacent two columns in series. Among adjacent two columns, all the heat pump units (1) in the right column are located on the circulating working medium pipeline (3), and the heat pump unit (1) in the left column and in the same row as the heat pump unit (1) in the right column is located on the circulating working medium pipeline (3). The heating heat source working medium pipeline (4) is used to connect the heat pump units (1) located at the rightmost in each row in series, and the series connection order is from the row with the lowest temperature of the heat pump unit (1) to the row with the highest temperature. Water circulates in the cooling heat source working medium pipeline (2), the circulating working medium pipeline (3) and the heating heat source working medium pipeline (4). In each row of units, the temperature of the water in the cooling heat source working medium pipeline (2), multiple circulating working medium pipelines (3) from left to right and the heating heat source working medium pipeline (4) gradually increases. The heat pump unit (1) is used to raise the temperature.
2. The low-temperature difference and large-span heating heat pump system according to claim 1, characterized in that The heat pump unit (1) includes an evaporative heat exchanger (51), a condensing heat exchanger (52), a compressor (53) and a throttle valve (54). The circulating outlet of the evaporative heat exchanger (51), the compressor (53) and the circulating inlet of the condensing heat exchanger (52) are connected in sequence. The circulating outlet of the condensing heat exchanger (52), the throttle valve (54) and the circulating inlet of the evaporative heat exchanger (51) are connected in sequence. The hot water inlet and hot water outlet of the evaporative heat exchanger (51) are used for hot water circulation. The cold water inlet and cold water outlet of the condensing heat exchanger (52) are used for cold water circulation. The circulating outlet of the evaporative heat exchanger (51), the compressor (53), the circulating inlet of the condensing heat exchanger (52), the circulating outlet of the condensing heat exchanger (52), the throttle valve (54) and the circulating inlet of the evaporative heat exchanger (51) are used for refrigerant circulation.
3. The low-temperature difference and large-span heating heat pump system according to claim 1, wherein The heating heat source working medium pipeline (4) is used to connect with the heat pump unit (1) located on the rightmost circulating working medium pipeline (3) and in the right column.
4. The low-temperature difference and large-span temperature rise heat pump system according to claim 1, characterized in that The heating heat source working medium pipeline (4) is used to connect with the heat pump units (1) that do not pass through the circulating working medium pipeline (3) in sequence, or multiple heat pump units (1) located on different circulating working medium pipelines (3) and in the right column.
5. The low-temperature difference and large-span heating heat pump system according to claim 1, characterized in that The cooling heat source working medium pipeline (2) includes multiple sub-pipelines, and multiple sub-pipelines are respectively used to provide heat source for the leftmost heat pump unit (1) in each row.
6. The low-temperature difference and large-span heating heat pump system according to claim 1, characterized in that The number of rows and columns of the heat pump units (1) is at least one, and the number of rows and columns cannot be one at the same time.
7. The low-temperature difference large-span heating heat pump system according to claim 1, characterized in that A circulating water tank (31) is provided on the circulating working medium pipeline (3).
8. The low-temperature difference and large-span heating heat pump system according to claim 1, wherein The circulating working fluid pipeline (3) is also provided with a circulating water pump (32).
9. The heat pump system according to claim 1, characterized in that, The cooling heat source working fluid pipeline (2), the circulating working fluid pipeline (3) and the heating heat source working fluid pipeline (4) are all made of water pipes.