CN111380253A - Multidirectional thermodynamic cycle - Google Patents

Abstract

The invention provides a multidirectional thermodynamic cycle, and belongs to the technical field of thermodynamics, power, refrigeration and heat pumps. Eight processes of a working medium, namely a working medium heat absorption process 12 from a secondary low-temperature heat source, a pressure increasing process 23 from a secondary low temperature, a heat release process 34 to a high-temperature heat source, a pressure reducing process 45 from a high temperature, a heat absorption process 56 from a middle-temperature heat source, a pressure reducing process 67 from a middle temperature, a heat absorption process 78 to a low-temperature heat source and a pressure reducing process 81 from a low temperature are sequentially carried out among a high-temperature heat source, a middle-temperature heat source, a low-temperature heat source and a secondary low-temperature heat source to form a closed process 123456781, so that a multidirectional thermodynamic.

Description

Multidirectional thermodynamic cycle

The technical field is as follows:

the invention belongs to the technical field of thermodynamics, power, refrigeration and heat pumps.

Background art:

cold demand, heat demand and power demand, which are common in human life and production; to achieve the cold, heat and power requirements, one pays for the cost of the equipment. In order to reduce corresponding cost, people need simple and direct fundamental theoretical support; especially under the condition of multi-temperature difference utilization or multi-energy utilization or the condition of simultaneously meeting different energy supply requirements, the fundamental theoretical support can greatly reduce the manufacturing difficulty and the manufacturing cost of related devices. In a thermal science basic theory system, thermodynamic cycle is the core of the theoretical basis of a heat energy utilization device and an energy utilization system; the creation and development application of thermodynamic cycle will play a significant role in the leap of energy utilization, and will actively push social progress and productivity development.

The invention provides corresponding multidirectional thermodynamic cycle aiming at the condition that middle-temperature heat resources are utilized to simultaneously meet high-temperature heat requirements and refrigeration requirements, considering the consideration of power resource utilization or the satisfaction of external power requirements and following the principle of simply, actively and efficiently realizing temperature difference and energy difference utilization.

The invention content is as follows:

the invention mainly aims to provide a multidirectional thermodynamic cycle which mainly uses medium-temperature heat resources to simultaneously meet high-temperature heat requirements and refrigeration requirements, gives consideration to power resource utilization or meets external power requirements, and specifically comprises the following contents:

1. the multidirectional thermodynamic cycle is a closed process 123456781 consisting of eight processes performed in sequence, namely a process 12 for absorbing heat from a secondary low-temperature heat source by a working medium, a process 23 for boosting heat from a secondary low temperature, a process 34 for releasing heat to a high-temperature heat source, a process 45 for reducing pressure from a high temperature, a process 56 for absorbing heat from a medium-temperature heat source, a process 67 for reducing pressure from a medium temperature, a process 78 for absorbing heat to a low-temperature heat source, and a process 81 for reducing pressure from a low temperature, and operates among a high-temperature heat source, a medium-temperature heat source, a low-temperature heat source, and.

2. The multidirectional thermodynamic cycle is a non-closed process 12345678 which works among a high-temperature heat source, a medium-temperature heat source, a low-temperature heat source and a sub-low-temperature heat source and consists of seven processes which are sequentially performed, namely a pressure increasing process 12 of a refrigerated medium from a sub-low temperature, a heat releasing process 23 of the high-temperature heat source, a pressure reducing process 34 of the high temperature, a heat absorbing process 45 of the medium-temperature heat source, a pressure reducing process 56 of the medium temperature, a heat releasing process 67 of the low-temperature heat source and a pressure reducing process 78 of the low temperature to the sub-low temperature.

3. The multidirectional thermodynamic cycle is a non-closed process 12345678 which works among a high-temperature heat source, a medium-temperature heat source, a low-temperature heat source and a sub-low-temperature heat source, and is composed of seven processes sequentially performed, namely a depressurization process 12 of a low-temperature heat source medium from low temperature, a heat absorption process 23 of the sub-low-temperature heat source, a pressure increase process 34 from low temperature, a heat release process 45 to the high-temperature heat source, a depressurization process 56 from high temperature, a heat absorption process 67 of the medium-temperature heat source and a depressurization process 78 from medium temperature.

4. The multidirectional thermodynamic cycle is a non-closed process 12345678 which works among a high-temperature heat source, a medium-temperature heat source, a low-temperature heat source and a sub-low-temperature heat source and is composed of seven processes sequentially performed, namely a depressurization process 12 of medium-temperature heat source medium from medium temperature, a heat release process 23 to low-temperature heat source, a depressurization process 34 from low temperature, a heat absorption process 45 from sub-low-temperature heat source, a pressure increase process 56 from sub-low temperature, a heat release process 67 to high-temperature heat source and a depressurization process 78 from high temperature.

5. The multidirectional thermodynamic cycle is a non-closed process 12345678 which works among a high-temperature heat source, a medium-temperature heat source, a low-temperature heat source and a sub-low-temperature heat source and is composed of seven processes sequentially performed, namely a pressure reduction process 12 of a heated medium from high temperature, a heat absorption process 23 of the medium-temperature heat source, a pressure reduction process 34 of the medium-temperature heat source, a heat release process 45 of the low-temperature heat source, a pressure reduction process 56 of the low-temperature heat source, a heat absorption process 67 of the sub-low-temperature heat source and a pressure increase process 78 of the sub-low-temperature.

Description of the drawings:

fig. 1 is an exemplary schematic flow diagram of group 1 of a multi-directional thermodynamic cycle provided in accordance with the present invention.

Fig. 2 is an exemplary schematic flow diagram of group 2 of a multi-directional thermodynamic cycle provided in accordance with the present invention.

Fig. 3 is an exemplary schematic flow diagram of group 3 of the multi-directional thermodynamic cycle provided in accordance with the present invention.

Fig. 4 is an exemplary schematic flow diagram of group 4 of the multi-directional thermodynamic cycle provided in accordance with the present invention.

Fig. 5 is an exemplary schematic flow diagram of group 5 of the multi-directional thermodynamic cycle provided in accordance with the present invention.

For ease of understanding, the following description is given:

(1) high temperature heat source-the substance that gets high temperature thermal load, the highest temperature, can also be called the heated medium.

(2) Medium temperature heat source-a substance that provides a medium temperature heat load (driving heat load and warming heat load) at a temperature only lower than that of the high temperature heat source.

(3) Low temperature heat source-a substance that carries away low temperature heat load, the temperature is lower than medium temperature heat source, also called low temperature heat medium, such as ambient air; or a low temperature heat demand consumer.

(4) The secondary low-temperature heat source, the object to be refrigerated, emits a secondary low-temperature heat load (or called refrigeration load).

(5) When the heat source substance directly serves as a working medium to participate in the circulation flow, the heat source substance corresponds to a corresponding heat source.

(6) The temperatures corresponding to the high-temperature heat source, the medium-temperature heat source, the low-temperature heat source and the sub-low-temperature heat source are called high temperature, medium temperature, low temperature and sub-low temperature correspondingly.

The specific implementation mode is as follows:

the invention is described in detail below with reference to the drawings and examples; wherein each example operates between a high temperature heat source, a medium temperature heat source, a low temperature heat source, and a sub-low temperature heat source.

Examples of the multi-directional thermodynamic cycle flow in the T-s diagram of fig. 1 are respectively such:

example (1), the working medium is sequentially subjected to 8 processes, namely, a constant-pressure (constant-temperature) endothermic process 12, a reversible adiabatic pressure-increasing process 23, a constant-pressure (constant-temperature) exothermic process 34, an irreversible adiabatic pressure-decreasing process 45, a constant-pressure endothermic process 56, a reversible adiabatic pressure-decreasing process 67, a constant-pressure (constant-temperature) exothermic process 78, and an irreversible adiabatic pressure-decreasing process 81, to form a multidirectional thermodynamic cycle 123456781.

Example (2), the working medium is subjected to a constant pressure (constant temperature) endothermic process 12, a reversible adiabatic pressure increasing process 23, a constant pressure (constant temperature) exothermic process 34, a reversible adiabatic pressure decreasing process 45, a constant pressure (constant temperature) endothermic process 56, a reversible adiabatic pressure decreasing process 67, a constant pressure (constant temperature) exothermic process 78, and a reversible adiabatic pressure decreasing process 81 in sequence, which form a multidirectional thermodynamic cycle 123456781.

Example (3), the working medium sequentially performs 8 processes, namely, a constant-pressure endothermic process 12, a reversible adiabatic pressure-increasing process 23, a constant-pressure exothermic process 34, a reversible adiabatic pressure-decreasing process 45, a constant-pressure endothermic process 56, a reversible adiabatic pressure-decreasing process 67, a constant-pressure exothermic process 78, and a reversible adiabatic pressure-decreasing process 81, to form a multidirectional thermodynamic cycle 123456781.

Example (4), the working medium is sequentially subjected to 8 processes, namely, a constant-pressure endothermic process 12, an irreversible adiabatic pressure-increasing process 23, a constant-pressure exothermic process 34, an irreversible adiabatic pressure-decreasing process 45, a constant-pressure endothermic process 56, an irreversible adiabatic pressure-decreasing process 67, a constant-pressure exothermic process 78, and an irreversible adiabatic pressure-decreasing process 81, to form a multidirectional thermodynamic cycle 123456781.

In the above four examples, the working medium obtains the medium temperature heat load from the medium temperature heat source in the 56 processes, the working medium obtains the refrigeration load from the secondary low temperature heat source in the 12 processes, the working medium releases the high temperature heat load to the high temperature heat source in the 34 processes, and the working medium releases the low temperature heat load to the low temperature cold source in the 78 processes; when the circulation net work is equal to zero, the sum of the medium-temperature heat load and the refrigeration load is equal to the sum of the high-temperature heat load and the low-temperature heat load; when the circulating net work is more than zero, the circulating net work is output outwards, and the sum of the medium-temperature heat load and the refrigeration load is equal to the sum of the high-temperature heat load, the low-temperature heat load and the outwards output work; when the circulation net work is less than zero, the circulation net work is input externally, and the sum of the high-temperature heat load and the low-temperature heat load is equal to the sum of the external input work, the medium-temperature heat load and the refrigeration load.

Examples of the multi-directional thermodynamic cycle flow in the T-s diagram of fig. 2 are respectively such:

example (1), the refrigerant medium is subjected to a reversible adiabatic pressure rise process 12, a constant pressure (constant temperature) heat release process 23, an irreversible adiabatic pressure drop process 34, a constant pressure heat absorption process 45, a reversible adiabatic pressure drop process 56, a constant pressure (constant temperature) heat release process 67 and an irreversible adiabatic pressure drop process 78 in sequence, and 7 processes are formed to form an unclosed multidirectional thermodynamic cycle 12345678.

Example (2), the refrigerant medium is subjected to a reversible adiabatic pressure increasing process 12, a constant pressure (constant temperature) heat releasing process 23, a reversible adiabatic pressure decreasing process 34, a constant pressure heat absorbing process 45, a reversible adiabatic pressure decreasing process 56, a constant pressure (constant temperature) heat releasing process 67, a reversible adiabatic pressure decreasing process 78 in sequence, and 7 processes in total, so that a non-closed multidirectional thermodynamic cycle 12345678 is formed.

Example (3), the refrigerant medium is subjected to a reversible adiabatic pressure increasing process 12, a constant pressure heat releasing process 23, a reversible adiabatic pressure decreasing process 34, a constant pressure (constant temperature) heat absorbing process 45, a reversible adiabatic pressure decreasing process 56, a constant pressure heat releasing process 67, a reversible adiabatic pressure decreasing process 78, which are 7 processes in sequence, so as to form a non-closed multidirectional thermodynamic cycle 12345678.

Example (4), the refrigerant medium is subjected to an irreversible adiabatic pressure increasing process 12, a constant pressure heat releasing process 23, an irreversible adiabatic pressure decreasing process 34, a constant pressure heat absorbing process 45, an irreversible adiabatic pressure decreasing process 56, a constant pressure heat releasing process 67, and an irreversible adiabatic pressure decreasing process 78, which are 7 processes in sequence, to form an unclosed multidirectional thermodynamic cycle 12345678.

In the two examples, the medium to be refrigerated obtains the medium temperature heat load from the medium temperature heat source in the 45-stage process, the medium to be refrigerated provides the refrigeration load by carrying out the non-closed thermodynamic cycle 12345678, the medium to be refrigerated releases the high temperature heat load to the high temperature heat source in the 23-stage process, and the medium to be refrigerated releases the low temperature heat load to the low temperature cold source in the 67-stage process; when the sum of the medium temperature thermal load and the refrigeration load is equal to the sum of the high temperature thermal load and the low temperature thermal load, the non-closed thermodynamic cycle 12345678 has no mechanical energy exchange with the outside; when the medium temperature heat load and the refrigeration load are more than or equal to the sum of the high temperature heat load and the low temperature heat load, the non-closed thermodynamic cycle 12345678 has mechanical energy output outwards; when the intermediate thermal load and the refrigeration load are less than the sum of the high temperature thermal load and the low temperature thermal load, the external inputs mechanical energy to the non-closed thermodynamic cycle 12345678.

The example of a multi-directional thermodynamic cycle flow in the T-s diagram of fig. 3 is such that:

in the example (1), the low-temperature heat source medium sequentially performs 7 processes, namely an irreversible adiabatic decompression process 12, a constant-pressure (constant-temperature) endothermic process 23, a reversible adiabatic boosting process 34, a constant-pressure (constant-temperature) exothermic process 45, an irreversible adiabatic decompression process 56, a constant-pressure endothermic process 67 and a reversible adiabatic decompression process 78, to form an unclosed multidirectional thermodynamic cycle 12345678.

Example (2), the low-temperature heat source medium is sequentially subjected to a reversible adiabatic decompression process 12, a constant-pressure (constant-temperature) endothermic process 23, a reversible adiabatic boosting process 34, a constant-pressure (constant-temperature) exothermic process 45, a reversible adiabatic decompression process 56, a constant-pressure (constant-temperature) endothermic process 67, a reversible adiabatic decompression process 78, and 7 processes in total, to form a non-closed multidirectional thermodynamic cycle 12345678.

Example (3), the low-temperature heat source medium sequentially performs a reversible adiabatic decompression process 12, a constant-pressure endothermic process 23, a reversible adiabatic boosting process 34, a constant-pressure exothermic process 45, a reversible adiabatic decompression process 56, a constant-pressure endothermic process 67, and a reversible adiabatic decompression process 78, which are 7 processes in total, to form an unclosed multidirectional thermodynamic cycle 12345678.

Example (4), the low-temperature heat source medium is sequentially subjected to 7 processes, namely an irreversible adiabatic decompression process 12, a constant-pressure endothermic process 23, an irreversible adiabatic boosting process 34, a constant-pressure exothermic process 45, an irreversible adiabatic decompression process 56, a constant-pressure endothermic process 67 and an irreversible adiabatic decompression process 78, to form an unclosed multidirectional thermodynamic cycle 12345678.

In the above four examples, the low-temperature heat source medium obtains the medium-temperature heat load from the medium-temperature heat source in the 67-process, the low-temperature heat source medium obtains the refrigeration load from the secondary low-temperature heat source in the 23-process, the low-temperature heat source medium releases the high-temperature heat load to the high-temperature heat source in the 45-process, and the low-temperature heat source medium completes the non-closed thermodynamic cycle 12345678 to obtain the low-temperature heat load; when the sum of the medium temperature thermal load and the refrigeration load is equal to the sum of the high temperature thermal load and the low temperature thermal load, the non-closed thermodynamic cycle 12345678 has no mechanical energy exchange with the outside; when the medium temperature heat load and the refrigeration load are more than or equal to the sum of the high temperature heat load and the low temperature heat load, the non-closed thermodynamic cycle 12345678 has mechanical energy output outwards; when the intermediate thermal load and the refrigeration load are less than the sum of the high temperature thermal load and the low temperature thermal load, the external inputs mechanical energy to the non-closed thermodynamic cycle 12345678.

The example of a multi-directional thermodynamic cycle flow in the T-s diagram of fig. 4 is such that:

example (1), the medium-temperature heat source medium sequentially performs a reversible adiabatic decompression process 12, a constant-pressure (constant-temperature) heat release process 23, an irreversible adiabatic decompression process 34, a constant-pressure (constant-temperature) heat absorption process 45, a reversible adiabatic boosting process 56, a constant-pressure (constant-temperature) heat release process 67, an irreversible adiabatic decompression process 78, and 7 processes in total, to form a non-closed multidirectional thermodynamic cycle 12345678.

Example (2), the medium-temperature heat source medium sequentially performs a reversible adiabatic decompression process 12, a constant-pressure (constant-temperature) heat release process 23, a reversible adiabatic decompression process 34, a constant-pressure (constant-temperature) heat absorption process 45, a reversible adiabatic boosting process 56, a constant-pressure (constant-temperature) heat release process 67, a reversible adiabatic decompression process 78, and 7 processes in total, to form a non-closed multidirectional thermodynamic cycle 12345678.

Example (3), the medium-temperature heat source medium sequentially performs 7 processes, namely a reversible adiabatic decompression process 12, a constant-pressure heat release process 23, a reversible adiabatic decompression process 34, a constant-pressure heat absorption process 45, a reversible adiabatic boosting process 56, a constant-pressure heat release process 67 and a reversible adiabatic decompression process 78, to form a non-closed multidirectional thermodynamic cycle 12345678.

Example (4), the medium temperature heat source medium sequentially performs 7 processes, namely an irreversible adiabatic decompression process 12, a constant pressure heat release process 23, an irreversible adiabatic decompression process 34, a constant pressure heat absorption process 45, an irreversible adiabatic boosting process 56, a constant pressure heat release process 67 and an irreversible adiabatic decompression process 78, to form an unclosed multidirectional thermodynamic cycle 12345678.

In the above four examples, the intermediate temperature heat source medium completes the non-closed thermodynamic cycle 12345678 to provide the intermediate temperature heat load, the intermediate temperature heat source medium obtains the refrigeration load from the secondary low temperature heat source in the 45 processes, the intermediate temperature heat source medium releases the high temperature heat load to the high temperature heat source in the 67 processes, and the intermediate temperature heat source medium releases the low temperature heat load to the low temperature heat source in the 23 processes; when the sum of the medium temperature thermal load and the refrigeration load is equal to the sum of the high temperature thermal load and the low temperature thermal load, the non-closed thermodynamic cycle 12345678 has no mechanical energy exchange with the outside; when the medium temperature heat load and the refrigeration load are more than or equal to the sum of the high temperature heat load and the low temperature heat load, the non-closed thermodynamic cycle 12345678 has mechanical energy output outwards; when the intermediate thermal load and the refrigeration load are less than the sum of the high temperature thermal load and the low temperature thermal load, the external inputs mechanical energy to the non-closed thermodynamic cycle 12345678.

The example of a multi-directional thermodynamic cycle flow in the T-s diagram of fig. 5 is such:

example (1), the heated medium is sequentially subjected to an irreversible adiabatic decompression process 12, a constant pressure endothermic process 23, a reversible adiabatic decompression process 34, a constant pressure (constant temperature) exothermic process 45, an irreversible adiabatic decompression process 56, a constant pressure (constant temperature) endothermic process 67, a reversible adiabatic boosting process 78, and 7 processes in total, to form an unclosed multidirectional thermodynamic cycle 12345678.

Example (2), the heated medium is subjected to a reversible adiabatic decompression process 12, a constant-pressure (constant-temperature) endothermic process 23, a reversible adiabatic decompression process 34, a constant-pressure (constant-temperature) exothermic process 45, a reversible adiabatic decompression process 56, a constant-pressure (constant-temperature) endothermic process 67, a reversible adiabatic boosting process 78 in sequence, and 7 processes in total, to form a non-closed multidirectional thermodynamic cycle 12345678.

Example (3), the heated medium is subjected to a reversible adiabatic decompression process 12, a constant pressure endothermic process 23, a reversible adiabatic decompression process 34, a constant pressure exothermic process 45, a reversible adiabatic decompression process 56, a constant pressure endothermic process 67, and a reversible adiabatic pressure rise process 78 in sequence, which are 7 processes in total, to form a non-closed multidirectional thermodynamic cycle 12345678.

Example (4), the heated medium is subjected to 7 processes in sequence, namely an irreversible adiabatic decompression process 12, a constant pressure endothermic process 23, an irreversible adiabatic decompression process 34, a constant pressure exothermic process 45, an irreversible adiabatic decompression process 56, a constant pressure endothermic process 67, and an irreversible adiabatic pressure increase process 78, to form an unclosed multidirectional thermodynamic cycle 12345678.

In the above four examples, the medium to be heated obtains the medium temperature heat load from the medium temperature heat source in the process of 23, the medium to be heated obtains the refrigeration load from the secondary low temperature heat source in the process of 67, the medium to be heated obtains the high temperature heat load by completing the non-closed thermodynamic cycle 12345678, and the medium to be heated releases the low temperature heat load to the low temperature heat source in the process of 45; when the sum of the medium temperature thermal load and the refrigeration load is equal to the sum of the high temperature thermal load and the low temperature thermal load, the non-closed thermodynamic cycle 12345678 has no mechanical energy exchange with the outside; when the medium temperature heat load and the refrigeration load are more than or equal to the sum of the high temperature heat load and the low temperature heat load, the non-closed thermodynamic cycle 12345678 has mechanical energy output outwards; when the intermediate thermal load and the refrigeration load are less than the sum of the high temperature thermal load and the low temperature thermal load, the external inputs mechanical energy to the non-closed thermodynamic cycle 12345678.

The effect that the technology of the invention can realize-the multidirectional thermodynamic cycle proposed by the invention has the following effects and advantages:

(1) the new construction utilizes the basic theory of heat energy (temperature difference).

(2) Through single circulation and a single working medium, the medium-temperature heat resources are utilized, and high-temperature heat supply and secondary low-temperature refrigeration are realized at the same time, or the high-temperature heat supply, the low-temperature heat supply and the secondary low-temperature refrigeration are realized at the same time.

(3) The method is simple, the flow is reasonable, the method is a common technology for realizing effective utilization of temperature difference, and the applicability is good.

(4) The medium-temperature heat driving realizes high-temperature heat supply and low-temperature refrigeration at the same time or realizes high-temperature heat supply, low-temperature heat supply and secondary low-temperature refrigeration at the same time, and the performance index is high.

(5) Supports the heat and power combined supply and provides a theoretical basis for constructing a simple and effective cold and heat and power combined supply device.

(6) Supports the combination of heat and power and provides a theoretical basis for constructing a simple and effective multi-energy effective utilization device.

(7) The working medium has wide application range, the working medium and the working parameters are flexibly matched, and the energy supply requirement can be adapted in a larger range.

(8) The thermodynamic cycle type for realizing temperature difference utilization and effective utilization of mechanical energy is expanded, and efficient utilization of heat energy and mechanical energy is facilitated.

Claims (5)

1. The multidirectional thermodynamic cycle is a closed process 123456781 consisting of eight processes performed in sequence, namely a process 12 for absorbing heat from a secondary low-temperature heat source by a working medium, a process 23 for boosting heat from a secondary low temperature, a process 34 for releasing heat to a high-temperature heat source, a process 45 for reducing pressure from a high temperature, a process 56 for absorbing heat from a medium-temperature heat source, a process 67 for reducing pressure from a medium temperature, a process 78 for absorbing heat to a low-temperature heat source, and a process 81 for reducing pressure from a low temperature, and operates among a high-temperature heat source, a medium-temperature heat source, a low-temperature heat source, and.

2. The multidirectional thermodynamic cycle is a non-closed process 12345678 which works among a high-temperature heat source, a medium-temperature heat source, a low-temperature heat source and a sub-low-temperature heat source and consists of seven processes which are sequentially performed, namely a pressure increasing process 12 of a refrigerated medium from a sub-low temperature, a heat releasing process 23 of the high-temperature heat source, a pressure reducing process 34 of the high temperature, a heat absorbing process 45 of the medium-temperature heat source, a pressure reducing process 56 of the medium temperature, a heat releasing process 67 of the low-temperature heat source and a pressure reducing process 78 of the low temperature to the sub-low temperature.

3. The multidirectional thermodynamic cycle is a non-closed process 12345678 which works among a high-temperature heat source, a medium-temperature heat source, a low-temperature heat source and a sub-low-temperature heat source, and is composed of seven processes sequentially performed, namely a depressurization process 12 of a low-temperature heat source medium from low temperature, a heat absorption process 23 of the sub-low-temperature heat source, a pressure increase process 34 from low temperature, a heat release process 45 to the high-temperature heat source, a depressurization process 56 from high temperature, a heat absorption process 67 of the medium-temperature heat source and a depressurization process 78 from medium temperature.

4. The multidirectional thermodynamic cycle is a non-closed process 12345678 which works among a high-temperature heat source, a medium-temperature heat source, a low-temperature heat source and a sub-low-temperature heat source and is composed of seven processes sequentially performed, namely a depressurization process 12 of medium-temperature heat source medium from medium temperature, a heat release process 23 to low-temperature heat source, a depressurization process 34 from low temperature, a heat absorption process 45 from sub-low-temperature heat source, a pressure increase process 56 from sub-low temperature, a heat release process 67 to high-temperature heat source and a depressurization process 78 from high temperature.

5. The multidirectional thermodynamic cycle is a non-closed process 12345678 which works among a high-temperature heat source, a medium-temperature heat source, a low-temperature heat source and a sub-low-temperature heat source and is composed of seven processes sequentially performed, namely a pressure reduction process 12 of a heated medium from high temperature, a heat absorption process 23 of the medium-temperature heat source, a pressure reduction process 34 of the medium-temperature heat source, a heat release process 45 of the low-temperature heat source, a pressure reduction process 56 of the low-temperature heat source, a heat absorption process 67 of the sub-low-temperature heat source and a pressure increase process 78 of the sub-low-temperature.

Images