An assembled self-adaptive combined cooling and heating super heat pump unit and its operation method

Abstract

To achieve efficient heat exchange across a wide range of temperature differences between the heat source and heat sink, significantly improving heat transfer efficiency and automatically changing operating modes based on the temperature and flow requirements of the heat source and heat sink to achieve efficient heat exchange under a wide range of variable operating conditions, this invention proposes a modular, adaptive combined cooling and heating super heat pump unit and operating method. The heat source and heat sink of this unit are assembled in one or more stages to achieve large-temperature heat exchange between the heat source and heat sink. Compared to existing technologies, this unit automatically changes operating modes based on heat source and heat sink temperature and flow signals, achieving high heat exchange efficiency under various heat exchange conditions, significantly reducing operating costs and offering significant technical and economic benefits compared to existing technologies.

Description

Technical Field

[0001] The present invention belongs to the technical field of energy utilization, and in particular relates to a heat exchanger for performing deep heat exchange between a heat source and a heat sink. Background Art

[0002] The energy utilization sector requires a large number of heat exchange processes, including the production of hot water or steam from common primary energy sources such as coal and natural gas through heat exchange devices such as boilers after combustion. Various chemical production sites and residential heating applications also require a large number of steam-to-water and water-to-water heat exchange processes. Because spontaneous heat exchange requires a necessary temperature difference between high-temperature and low-temperature fluids, the hot water outlet temperature of conventional heat exchangers must be higher than the cold water inlet temperature. If the hot water outlet temperature needs to be lowered to a level lower than the cold water inlet temperature, a heat pump or other device is required. Using a heat pump, hot water is used as the driving energy source, generating a refrigeration effect that can further cool the hot water. With heat pump technology, the hot water outlet temperature can be significantly lower than the cold water inlet temperature, significantly reducing the irreversible losses in the heat exchange process between hot and cold water compared to conventional heat exchangers.

[0003] Due to numerous limitations, including thermodynamic cycles, circulating fluid properties, heat transfer coefficients, and the equipment's temperature and pressure resistance, various heat pump technologies can only operate within their respective temperature ranges. Absorption heat pumps require a third source of heat, in addition to the heat source and heat sink. Compression heat pumps, on the other hand, struggle to achieve a high heat sink temperature due to the compressor's temperature and pressure resistance. To achieve efficient heat exchange across a large temperature difference between the heat source and heat sink, and to reduce irreversible losses during the heat transfer process, this invention proposes a modular, adaptive, combined cooling and heating super heat pump unit and operating method. Summary of the Invention

[0004] To achieve efficient heat exchange across a wide range of temperature differences between the heat source and heat sink, significantly improving heat transfer efficiency and automatically changing operating modes based on the temperature and flow requirements of the heat source and heat sink to achieve efficient heat exchange under a wide range of variable operating conditions, this invention proposes a modular, adaptive combined cooling and heating super heat pump unit and operating method. The heat source and heat sink of this unit are assembled in one or more stages to achieve large-temperature heat exchange between the heat source and heat sink. Compared to existing technologies, this unit automatically changes operating modes based on heat source and heat sink temperature and flow signals, achieving high heat exchange efficiency under various heat exchange conditions, significantly reducing operating costs and offering significant technical and economic benefits compared to existing technologies.

[0005] The present invention proposes an assembled self-adaptive combined cooling and heating super heat pump unit and an operating method thereof, wherein the unit comprises an evaporator (1), a condenser (2), a compressor A (3), a compressor B (4), a pipeline A (5), a pipeline B (6), a valve A (7), a valve B (8), a throttling device (9), a valve C (10), a valve D (11), a valve E (12), a heat source inlet (13), a heat source outlet (14), a heat sink inlet (15) and a heat sink outlet (16), wherein the evaporator (1) is connected to the compressor A (3), the valve C (10), the pipeline A (5) and the throttling device (9), and the condenser The evaporator (2) is connected to the valve D (11), the compressor B (4), the pipeline B (6) and the throttling device (9), the throttling device (9) is connected to the evaporator (1) and the condenser (2), the compressor A (3) is connected to the evaporator (1), the valve C (10), the valve E (12) and the valve D (11), the compressor B (4) is connected to the valve C (10), the valve E (12), the valve D (11) and the condenser (2), the pipeline A (5) is connected to the evaporator (1), the pipeline B (6) is connected to the condenser (2), the valve A (7) is installed on the pipeline A (5), and the valve B (8) is installed on the pipeline B (6).

[0006] In the unit, the circulating medium circulating through the compressor A (3), the compressor B (4), the condenser (2), the throttling device (9) and the evaporator (1) is a natural working fluid or Freon, and the evaporator (1) and the condenser (2) are plate heat exchangers, shell and tube heat exchangers or heat pipe heat exchangers.

[0007] According to the temperature and flow changes of the heat source and heat sink, the unit adopts the following operation modes:

[0008] ① When the heat source and heat sink are running at full load and a higher heat sink outlet temperature or a lower heat source outlet temperature is required, valves A (7), B (8), C (10) and D (11) are closed and valve E (12) is opened. The heat source fluid enters the evaporator (1) and the heat sink fluid enters the condenser (2). The heat source fluid is cooled in the evaporator (1) and the heat sink fluid is heated in the condenser (2). The circulating medium circulates back and forth through compressor A (3), valve E (12), compressor B (4), condenser (2), throttling device (9) and evaporator (1) in sequence.

[0009] ② When the heat source and heat sink are running at full load and a lower heat sink outlet temperature or a higher heat source outlet temperature is required, valves A (7), B (8) and E (12) are closed, and valves C (10) and D (11) are opened. The heat source fluid all enters the evaporator (1), and the heat sink fluid all enters the condenser (2). The heat source fluid is cooled in the evaporator (1), and the heat sink fluid is heated in the condenser (2). The circulating medium enters compressor A (3) and compressor B (4) in parallel, and then circulates back and forth through the condenser (2), throttling device (9) and evaporator (1) in sequence.

[0010] ③ When the heat source and heat sink are operated at partial load and a higher heat sink outlet temperature or a lower heat source outlet temperature is required, valve A (7) and valve B (8) are partially opened according to the change ratio of the heat source and heat pump load, valve C (10) and valve D (11) are closed, and valve E (12) is opened. The heat source fluid enters the evaporator (1) and the heat sink fluid enters the condenser (2). The heat source fluid is cooled in the evaporator (1) and the heat sink fluid is heated in the condenser (2). The circulating medium circulates back and forth through compressor A (3), valve E (12), compressor B (4), condenser (2), throttling device (9) and evaporator (1) in sequence.

[0011] ④ When the heat source and heat sink are operated at partial load and a lower heat sink outlet temperature or a higher heat source outlet temperature is required, valve A (7) and valve B (8) are partially opened according to the change ratio of the heat source and heat pump load, valve E (12) is closed, valve C (10) and valve D (11) are opened, and the heat source fluid all enters the evaporator (1), and the heat sink fluid all enters the condenser (2). The heat source fluid is cooled in the evaporator (1), and the heat sink fluid is heated in the condenser (2). The circulating medium enters the compressor A (3) and compressor B (4) in parallel, and then circulates back and forth through the condenser (2), the throttling device (9) and the evaporator (1) in turn.

[0012] ⑤ The heat source and heat sink operate at low load. According to the load change ratio of the heat source and heat pump, valve A (7) and valve B (8) are partially opened, valve C (10), valve E (12) and compressor B (4) are closed, and valve D (11) is opened. The heat source fluid enters the evaporator (1) and the heat sink fluid enters the condenser (2). The heat source fluid is cooled in the evaporator (1) and the heat sink fluid is heated in the condenser (2). The circulating medium circulates back and forth through compressor A (3), valve D (11), condenser (2), throttling device (9) and evaporator (1) in sequence.

[0013] The compressor A (3) and the compressor B (4) of the unit are of vortex type, centrifugal type, screw type or magnetic suspension type. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a system diagram of an assembled self-adaptive combined cooling and heating super heat pump unit.

[0015] Reference numerals:

[0016] 1-Evaporator, 2-Condenser, 3-Compressor A, 4-Compressor B, 5-Pipeline A, 6-Pipeline B, 7-Valve A, 8-Valve B, 9-Throttling device, 10-Valve C, 11-Valve D, 12-Valve E, 13-Heat source inlet, 14-Heat source outlet, 15-Heat sink inlet, 16-Heat sink outlet DETAILED DESCRIPTION

[0017] In order to make the purpose, technical solutions and advantages of the implementation of the present invention clearer, the technical solutions in the embodiments of the present invention will be described in more detail below with reference to the drawings in the embodiments of the present invention. In the drawings, the same or similar reference numerals throughout represent the same or similar elements or elements with the same or similar functions. The described embodiments are part of the embodiments of the present invention, not all of the embodiments. The embodiments described below with reference to the drawings are exemplary and are intended to be used to explain the present invention, and should not be understood as limiting the present invention. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0018] The embodiment comprises an evaporator (1), a condenser (2), a compressor A (3), a compressor B (4), a pipeline A (5), a pipeline B (6), a valve A (7), a valve B (8), a throttling device (9), a valve C (10), a valve D (11), a valve E (12), a heat source inlet (13), a heat source outlet (14), a heat sink inlet (15) and a heat sink outlet (16), wherein the evaporator (1) is connected to the compressor A (3), the valve C (10), the pipeline A (5) and the throttling device (9), and the condenser (2) is connected to the valve D (11), the compressor The machine B (4), the pipeline B (6) and the throttling device (9) are connected, the throttling device (9) is connected to the evaporator (1) and the condenser (2), the compressor A (3) is connected to the evaporator (1), the valve C (10), the valve E (12) and the valve D (11), the compressor B (4) is connected to the valve C (10), the valve E (12), the valve D (11) and the condenser (2), the pipeline A (5) is connected to the evaporator (1), the pipeline B (6) is connected to the condenser (2), the valve A (7) is installed on the pipeline A (5), and the valve B (8) is installed on the pipeline B (6).

[0019] The circulating medium circulating through the compressor A (3), compressor B (4), condenser (2), throttling device (9) and evaporator (1) in the unit is carbon dioxide. The evaporator (1) and condenser (2) are plate-type heat exchangers. The compressors A (3) and B (4) of the unit are scroll-type.

[0020] According to the temperature and flow changes of the heat source and heat sink, the unit adopts the following operation modes:

[0021] ① When the heat source and heat sink loads are greater than 80% and the heat sink outlet temperature is greater than 90°C or the heat source outlet temperature is less than 10°C, valves A (7), B (8), C (10) and D (11) are closed and valve E (12) is opened. The heat source fluid enters the evaporator (1) and the heat sink fluid enters the condenser (2). The heat source fluid is cooled in the evaporator (1) and the heat sink fluid is heated in the condenser (2). The carbon dioxide is circulated through the compressor A (3), valve E (12), compressor B (4), condenser (2), throttling device (9) and evaporator (1) in sequence.

[0022] ② When the heat source and heat sink loads are greater than 80% and the heat sink outlet temperature is less than 90°C or the heat source outlet temperature is greater than 10°C, valves A (7), B (8) and E (12) are closed, and valves C (10) and D (11) are opened. The heat source fluid enters the evaporator (1) and the heat sink fluid enters the condenser (2). The heat source fluid is cooled in the evaporator (1) and the heat sink fluid is heated in the condenser (2). The carbon dioxide enters the compressor A (3) and the compressor B (4) in parallel and then circulates through the condenser (2), the throttling device (9) and the evaporator (1) in turn.

[0023] ③ When the heat source and heat sink loads are less than 80% and greater than 40%, and the heat sink outlet temperature is greater than 90°C or the heat source outlet temperature is less than 10°C, valve A (7) and valve B (8) are partially opened according to the change ratio of the heat source and heat pump loads, valve C (10) and valve D (11) are closed, and valve E (12) is opened. The heat source fluid enters the evaporator (1) and the heat sink fluid enters the condenser (2). The heat source fluid is cooled in the evaporator (1) and the heat sink fluid is heated in the condenser (2). The circulating medium passes through the compressor A (3), valve E (12), compressor B (4), condenser (2), throttling device (9) and evaporator (1) in turn and circulates back and forth.

[0024] ④ When the heat source and heat sink loads are less than 80% and greater than 40%, and the heat sink outlet temperature is less than 90°C or the heat source outlet temperature is greater than 10°C, valve A (7) and valve B (8) are partially opened according to the change ratio of the heat source and heat pump loads, valve E (12) is closed, valve C (10) and valve D (11) are opened, and the heat source fluid all enters the evaporator (1), and the heat sink fluid all enters the condenser (2). The heat source fluid is cooled in the evaporator (1), and the heat sink fluid is heated in the condenser (2). The carbon dioxide enters the compressor A (3) and compressor B (4) in parallel, and then circulates through the condenser (2), the throttling device (9) and the evaporator (1) in turn.

[0025] ⑤ When the heat source and heat sink loads are less than 40%, the openings of valves A (7) and B (8) are linearly adjusted according to the change ratio of the heat source and heat pump loads, valves C (10), E (12) and compressor B (4) are closed, and valve D (11) is opened. The heat source fluid enters the evaporator (1) and the heat sink fluid enters the condenser (2). The heat source fluid is cooled in the evaporator (1) and the heat sink fluid is heated in the condenser (2). The carbon dioxide is circulated through compressor A (3), valve D (11), condenser (2), throttling device (9) and evaporator (1) in sequence.

[0026] Finally, it should be noted that the above embodiments are intended only to illustrate the technical solutions of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art will appreciate that modifications may be made to the technical solutions described in the above embodiments, or that some of the technical features may be replaced with equivalents; such modifications or replacements do not deviate from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. An assembled self-adaptive combined cooling and heating super heat pump unit, characterized by: The unit comprises an evaporator (1), a condenser (2), a compressor A (3), a compressor B (4), a pipeline A (5), a pipeline B (6), a valve A (7), a valve B (8), a throttling device (9), a valve C (10), a valve D (11), a valve E (12), a heat source inlet (13), a heat source outlet (14), a heat sink inlet (15) and a heat sink outlet (16), wherein the evaporator (1) is connected to the compressor A (3), the valve C (10), the pipeline A (5) and the throttling device (9), the condenser (2) is connected to the valve D (11), the compressor B (4), the pipeline B (6) and the throttling device (9), the throttling device (9) is connected to the evaporator (1) and the condenser (2), the compressor A (3) is connected to the evaporator (1) and the evaporator (1). ), valve C (10), valve E (12) and valve D (11), compressor B (4) and valve C (10), valve E (12), valve D (11) and condenser (2) are connected, pipeline A (5) is connected to evaporator (1), pipeline B (6) is connected to condenser (2), valve A (7) is installed on pipeline A (5), valve B (8) is installed on pipeline B (6), the circulating medium circulating in compressor A (3), compressor B (4), condenser (2), throttling device (9) and evaporator (1) in the unit is natural working fluid or Freon, the evaporator (1) and condenser (2) are plate heat exchangers, shell and tube heat exchangers or heat pipe heat exchangers, according to the temperature and flow changes of the heat source and heat sink, the unit adopts the following operation mode: ① When the heat source and heat sink are running at full load and a higher heat sink outlet temperature or a lower heat source outlet temperature is required, valves A (7), B (8), C (10) and D (11) are closed, and valve E (12) is opened. The heat source fluid enters the evaporator (1) and the heat sink fluid enters the condenser (2). The heat source fluid is cooled in the evaporator (1) and the heat sink fluid is heated in the condenser (2). The circulating medium passes through compressor A (3), valve E (12), compressor B (4), condenser (2), throttling device (9) and evaporator (1) in turn for a reciprocating cycle. ② When the heat source and heat sink are running at full load and a lower heat sink outlet temperature or a higher heat source outlet temperature is required, valves A (7), B (8) and E (12) are closed, valves C (10) and D (11) are opened, and the heat source fluid all enters the evaporator (1), and the heat sink fluid all enters the condenser (2). The heat source fluid is cooled in the evaporator (1), and the heat sink fluid is heated in the condenser (2). The circulating medium enters compressor A (3) and compressor B (4) in parallel, and then circulates back and forth through the condenser (2), throttling device (9) and evaporator (1) in sequence. ③ When the heat source and heat sink are operated at partial load and a higher heat sink outlet temperature or a lower heat source outlet temperature is required, valve A (7) and valve B (8) are partially opened according to the change ratio of the heat source and heat pump load, valve C (10) and valve D (11) are closed, and valve E (12) is opened. The heat source fluid enters the evaporator (1) and the heat sink fluid enters the condenser (2). The heat source fluid is cooled in the evaporator (1) and the heat sink fluid is heated in the condenser (2). The circulating medium passes through the compressor A (3), valve E (12), compressor B (4), condenser (2), throttling device (9) and evaporator (1) in turn for a reciprocating cycle. ④ When the heat source and heat sink are operated at partial load and a lower heat sink outlet temperature or a higher heat source outlet temperature is required, valve A (7) and valve B (8) are partially opened according to the change ratio of the heat source and heat pump load, valve E (12) is closed, valve C (10) and valve D (11) are opened, and the heat source fluid all enters the evaporator (1), and the heat sink fluid all enters the condenser (2). The heat source fluid is cooled in the evaporator (1), and the heat sink fluid is heated in the condenser (2). The circulating medium enters the compressor A (3) and compressor B (4) in parallel, and then circulates back and forth through the condenser (2), the throttling device (9) and the evaporator (1) in turn; ⑤ The heat source and heat sink operate at low load. According to the load change ratio of the heat source and heat pump, valve A (7) and valve B (8) are partially opened, valve C (10), valve E (12) and compressor B (4) are closed, and valve D (11) is opened. The heat source fluid enters the evaporator (1) and the heat sink fluid enters the condenser (2). The heat source fluid is cooled in the evaporator (1) and the heat sink fluid is heated in the condenser (2). The circulating medium circulates back and forth through compressor A (3), valve D (11), condenser (2), throttling device (9) and evaporator (1) in sequence.

2. The assembled self-adaptive combined cooling and heating super heat pump unit according to claim 1, characterized in that: The heat exchange between the heat source and the heat sink adopts a single-stage or multi-stage series connection of pipelines.

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