阅读说明：本技术 一种飞机座舱加温系统 (Aircraft cabin heating system ) 是由 许玉 王佳乐 李玲 夏文庆 于 2021-11-23 设计创作，主要内容包括：本发明涉及一种飞机座舱加温系统。所述系统包括滑油系统和蒸发循环制冷系统；所述蒸发循环制冷系统包括：热交换器和冷媒-滑油换热器；所述热交换器设置在座舱内；所述热交换器的入口与所述冷媒-滑油换热器的冷媒出口连通；所述冷媒-滑油换热器的冷媒入口与所述热交换器的出口连通,所述冷媒-滑油换热器的进油口与所述滑油系统的出油口连通；所述滑油系统的进油口与所述冷媒-滑油换热器的出油口连通。本发明可以减少飞机燃油的消耗,提高燃油利用率,减少碳排放。(The invention relates to an aircraft cabin heating system. The system comprises an oil system and an evaporation cycle refrigeration system; the evaporation cycle refrigeration system includes: a heat exchanger and a refrigerant-oil heat exchanger; the heat exchanger is arranged in the cabin; the inlet of the heat exchanger is communicated with the refrigerant outlet of the refrigerant-lubricating oil heat exchanger; a refrigerant inlet of the refrigerant-lubricating oil heat exchanger is communicated with an outlet of the heat exchanger, and an oil inlet of the refrigerant-lubricating oil heat exchanger is communicated with an oil outlet of the lubricating oil system; and an oil inlet of the lubricating oil system is communicated with an oil outlet of the refrigerant-lubricating oil heat exchanger. The invention can reduce the fuel consumption of the airplane, improve the fuel utilization rate and reduce the carbon emission.)

1. An aircraft cabin warming system, comprising: a lubricating oil system and an evaporative cycle refrigeration system; the evaporation cycle refrigeration system includes: a heat exchanger and a refrigerant-oil heat exchanger;

the heat exchanger is arranged in the cabin; the inlet of the heat exchanger is communicated with the refrigerant outlet of the refrigerant-lubricating oil heat exchanger; a refrigerant inlet of the refrigerant-lubricating oil heat exchanger is communicated with an outlet of the heat exchanger, and an oil inlet of the refrigerant-lubricating oil heat exchanger is communicated with an oil outlet of the lubricating oil system; an oil inlet of the lubricating oil system is communicated with an oil outlet of the refrigerant-lubricating oil heat exchanger, when the cabin needs to be heated, high-temperature lubricating oil in the lubricating oil system enters the refrigerant-lubricating oil heat exchanger, and the refrigerant and the high-temperature lubricating oil generate heat exchange in the refrigerant-lubricating oil heat exchanger to form a high-temperature refrigerant; the high-temperature refrigerant enters a heat exchanger to transfer heat to the cabin to heat the cabin.

2. An aircraft cabin warming system according to claim 1 wherein the evaporative cycle refrigeration system further comprises: and the inlet of the compressor is communicated with the refrigerant outlet of the refrigerant-lubricating oil heat exchanger, and the inlet of the heat exchanger is communicated with the outlet of the compressor.

3. An aircraft cabin warming system according to claim 2 wherein the evaporative cycle refrigeration system further comprises: and a refrigerant inlet of the evaporator is communicated with an outlet of the heat exchanger, and a refrigerant outlet of the evaporator is communicated with a refrigerant inlet of the refrigerant-lubricating oil heat exchanger.

4. An aircraft cabin warming system according to claim 3 wherein the evaporative cycle refrigeration system further comprises: an expansion valve; and a refrigerant inlet of the evaporator is communicated with an outlet of the heat exchanger through the expansion valve.

5. An aircraft cabin warming system according to claim 1 wherein the oil system comprises: a lubricating oil tank and an engine gearbox; an oil inlet of the refrigerant-lubricating oil heat exchanger is communicated with an oil outlet of the engine gear box, an oil inlet of the engine gear box is communicated with an oil outlet of the lubricating oil tank, and an oil inlet of the lubricating oil tank is communicated with an oil outlet of the refrigerant-lubricating oil heat exchanger.

6. An aircraft cabin warming system according to claim 5 wherein the oil system further comprises: a lubricating oil radiator; an oil inlet of the lubricating oil radiator is communicated with an oil outlet of the engine gearbox; and the oil outlet of the lubricating oil radiator is respectively communicated with the oil inlet of the lubricating oil tank and the oil inlet of the refrigerant-lubricating oil heat exchanger.

7. An aircraft cabin warming system according to claim 6 wherein the oil system further comprises: a lubricating oil pump; and the oil outlet of the lubricating oil radiator is communicated with the oil inlet of the lubricating oil tank through the lubricating oil pump.

8. An aircraft cabin warming system according to claim 5 wherein the oil system further comprises: a bypass valve; and an oil inlet of the refrigerant-lubricating oil heat exchanger is communicated with an oil outlet of the engine gear box through the bypass valve.

9. An aircraft cabin warming system according to claim 3 wherein the evaporative cycle refrigeration system further comprises: an air heater; the air inlet end of the air heater is communicated with the outside of the cabin; the air outlet end of the air heater is connected with the air inlet end of the evaporator; and the air outlet end of the evaporator is communicated with the outside of the cabin.

Technical Field

The invention relates to the technical field of aircraft cabins, in particular to an aircraft cabin heating system.

Background

The aircraft can experience various atmospheric environments during the stages of takeoff, cruising, landing, etc., particularly with severe changes in temperature and pressure. In order to provide a proper temperature for the aircraft cabin under low-temperature conditions such as high altitude or cold ground and the like and ensure the comfort of passengers, the aircraft cabin needs to be heated. At present, common cabin mode of heating mainly has engine bleed, engine waste gas, fuel burning and electrical heating etc, wherein, engine bleed system relies on its simple reliable advantage and is adopted by most aircraft, however, can cause engine power and thrust loss by a wide margin from aircraft engine bleed, influence flight power, cause aircraft fuel compensation to lose the increase then, produce more carbon and discharge, consequently, need to develop novel aircraft cabin system of heating, the solution reduces the difficult problem of fuel compensation loss when not influencing engine power.

Disclosure of Invention

The invention aims to provide an aircraft cabin heating system which can reduce the consumption of aircraft fuel, improve the utilization rate of the fuel and reduce carbon emission.

In order to achieve the purpose, the invention provides the following scheme:

an aircraft cabin warming system comprising: a lubricating oil system and an evaporative cycle refrigeration system; the evaporation cycle refrigeration system includes: a heat exchanger and a refrigerant-oil heat exchanger;

the heat exchanger is arranged in the cabin; the inlet of the heat exchanger is communicated with the refrigerant outlet of the refrigerant-lubricating oil heat exchanger; a refrigerant inlet of the refrigerant-lubricating oil heat exchanger is communicated with an outlet of the heat exchanger, and an oil inlet of the refrigerant-lubricating oil heat exchanger is communicated with an oil outlet of the lubricating oil system; an oil inlet of the lubricating oil system is communicated with an oil outlet of the refrigerant-lubricating oil heat exchanger, when the cabin needs to be heated, high-temperature lubricating oil in the lubricating oil system enters the refrigerant-lubricating oil heat exchanger, and the refrigerant and the high-temperature lubricating oil generate heat exchange in the refrigerant-lubricating oil heat exchanger to form a high-temperature refrigerant; the high-temperature refrigerant enters a heat exchanger to transfer heat to the cabin to heat the cabin.

Optionally, the evaporation cycle refrigeration system further comprises: and the inlet of the compressor is communicated with the refrigerant outlet of the refrigerant-lubricating oil heat exchanger, and the inlet of the heat exchanger is communicated with the outlet of the compressor.

Optionally, the evaporation cycle refrigeration system further comprises: and a refrigerant inlet of the evaporator is communicated with an outlet of the heat exchanger, and a refrigerant outlet of the evaporator is communicated with a refrigerant inlet of the refrigerant-lubricating oil heat exchanger, so that the system can be heated by utilizing the heat of the ambient air when the temperature of the ambient air is higher.

Optionally, the evaporation cycle refrigeration system further comprises: an expansion valve; and a refrigerant inlet of the evaporator is communicated with an outlet of the heat exchanger through the expansion valve.

Optionally, the oil system comprises: a lubricating oil tank and an engine gearbox; an oil inlet of the refrigerant-lubricating oil heat exchanger is communicated with an oil outlet of the engine gear box, an oil inlet of the engine gear box is communicated with an oil outlet of the lubricating oil tank, and an oil inlet of the lubricating oil tank is communicated with an oil outlet of the refrigerant-lubricating oil heat exchanger.

Optionally, the oil system further comprises: a lubricating oil radiator; an oil inlet of the lubricating oil radiator is communicated with an oil outlet of the engine gearbox; and the oil outlet of the lubricating oil radiator is respectively communicated with the oil inlet of the lubricating oil tank and the oil inlet of the refrigerant-lubricating oil heat exchanger.

Optionally, the oil system further comprises: a lubricating oil pump; and the oil outlet of the lubricating oil radiator is communicated with the oil inlet of the lubricating oil tank through the lubricating oil pump.

Optionally, the oil system further comprises: a bypass valve; and an oil inlet of the refrigerant-lubricating oil heat exchanger is communicated with an oil outlet of the engine gear box through the bypass valve.

Optionally, the evaporation cycle refrigeration system further comprises: an air heater; the air inlet end of the air heater is communicated with the outside of the cabin; the air outlet end of the air heater is connected with the air inlet end of the evaporator; and the air outlet end of the evaporator is communicated with the outside of the cabin.

According to the specific embodiment provided by the invention, the invention discloses the following technical effects: the inlet of the heat exchanger is communicated with the refrigerant outlet of the refrigerant-lubricating oil heat exchanger; a refrigerant inlet of the refrigerant-lubricating oil heat exchanger is communicated with an outlet of the heat exchanger, and an oil inlet of the refrigerant-lubricating oil heat exchanger is communicated with an oil outlet of the lubricating oil system; an oil inlet of the lubricating oil system is communicated with an oil outlet of the refrigerant-lubricating oil heat exchanger, when the cabin needs to be heated, high-temperature lubricating oil in the lubricating oil system enters the refrigerant-lubricating oil heat exchanger, and the refrigerant and the high-temperature lubricating oil generate heat exchange in the refrigerant-lubricating oil heat exchanger to form a high-temperature refrigerant; the high-temperature refrigerant enters the heat exchanger to transfer heat to the cabin to heat the cabin, and the high-temperature lubricating oil in the lubricating oil system is used for heating the cabin, so that the fuel oil consumption of the airplane can be reduced, and the fuel oil utilization rate can be improved.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without inventive exercise.

Fig. 1 is a connection diagram of an aircraft cabin warming system according to an embodiment of the present invention;

FIG. 2 is a connection diagram of an experimental system according to an embodiment of the present invention;

fig. 3 is a pressure-enthalpy diagram of the refrigerant circuit according to an embodiment of the present invention.

Description of the symbols:

the system comprises a cabin 1, a heat exchanger 2, a refrigerant-lubricating oil heat exchanger 3, an evaporator 4, a compressor 5, an expansion valve 6, a lubricating oil radiator 7, a lubricating oil tank 8, a lubricating oil pump 9, an engine gear box 10, a bypass valve 11, a capillary tube 12, a lubricating oil flowmeter 13, a refrigerant flowmeter 14, a heater 15, a T-temperature sensor and a P-pressure sensor.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.

The aviation industry accounts for about 11% of the total carbon emission of the transportation industry, and the carbon emission of the current aviation industry mainly comes from combustion of aviation fuel oil. For example, in 2019, an airline fuel consumes 3689 ten thousand tons, and the equivalent carbon emission is 1.16 hundred million tons, which accounts for 97 percent of the total emission of the industry. How to reduce the fuel consumption of the airplane and improve the fuel utilization efficiency becomes a difficult problem which needs to be solved for realizing the development goals of carbon peak reaching and carbon neutralization in the aviation industry.

In addition, the refrigeration and heating functions of the existing aircraft cockpit are realized by two independent systems, one set of Air pipeline cannot be shared, the System integration level is relatively low, the volume and the weight of the System are increased, and the fuel compensation loss is increased, so that if a new refrigeration and heating System is developed, the existing main refrigeration modes of the aircraft, namely an Air Cycle refrigeration System (ACS) and an evaporation Cycle refrigeration System (VCS), need to be known. With the increase in on-board electronics, increased thermal loads, and increased passenger comfort requirements, ACS has become increasingly difficult to meet cooling demands, and the high efficiency cooling capabilities of VCS have become apparent. Meanwhile, compared to ACS, VCS has the significant advantages of high coefficient of performance (COP), no engine bleed air, and low penalty. However, currently, all onboard VCSs are single-system systems with only a refrigeration function. If the system can be transformed into a dual-system with the functions of refrigeration and heating, the problems are expected to be solved. However, when the dual-system VCS operates in a warming, i.e., heating, mode, there is a certain requirement for ambient temperature, and when the ambient temperature is low, the COP of the system is low, and only a small amount of heat can be extracted from the ambient air for cabin warming, or even heat cannot be extracted from the ambient air. If a heat source is available, the temperature of the heat source is higher in various environments in which the airplane operates, the dual-system VCS can provide continuous hot air for the cabin in the heating mode, and reliable heating of the cabin is achieved. The lubricating oil for lubricating an engine gear box and a hydraulic system, high-power electronic equipment such as a radar and the like on the airplane and tail gas discharged by an engine can be utilized. The lubricating oil as one of the heat sources has the advantages of larger heat quantity and higher temperature, and the modification to the airplane is smaller and the utilization efficiency is higher. At present, a Lubricating Oil System (LOS) and a VCS (volatile Oil System) of an airplane are independent subsystems, performance research of the LOS and the VCS is also analyzed independently, and coupling research is relatively few. But in fact, the two are closely related in heat and energy requirements and usage. Thus, continuing the individual analysis has not met the design philosophy of integrated thermal management of aircraft, which is detrimental to efficient use of energy and integrated optimization of onboard systems. The LOS has the main functions of lubricating moving parts in a main speed reducer of the engine, transferring heat generated by friction of a bearing and a kinematic pair and heat from the engine through conduction and heat radiation and keeping the temperature of the speed reducer and the engine within an operation allowable range. From the traditional perspective, the lubricating oil is a refrigerating medium, the heat absorbed by the lubricating oil is waste heat which needs to be exhausted from an aircraft, and from the design perspective of comprehensive thermal management of the aircraft, the lubricating oil is high in temperature and large in heat, and is used as a heat source for a dual-control VCS heating cabin, so that LOS and VCS can be coupled, and the problem of cabin heating can be solved.

Therefore, the invention provides a novel aircraft cabin heating system based on the design concept of double-carbon target and comprehensive thermal management of an aircraft, the VCS and the LOS are coupled and associated, the VCS extracts heat from the LOS, and extracts lubricating oil waste heat through heat pump circulation to transfer the lubricating oil waste heat to cabin air, so that the efficient heating of a cabin can be realized under the condition of air bleed from an engine, the lubricating oil waste heat can be efficiently recovered, the fuel consumption and carbon emission of the aircraft cabin heating system are reduced, and the fuel consumption of the aircraft is remarkably reduced.

As shown in fig. 1, the upper part of the old scheme is the original cabin warming process, and as can be seen from fig. 1, the original cabin warming mainly depends on bleed air from the aircraft engines, resulting in engine thrust loss, which in turn leads to increased aircraft fuel compensation loss and more carbon emissions, and the lower part of the new scheme at the dotted line is the working process of the aircraft cabin warming system provided by the present invention, as shown in fig. 1, the aircraft cabin 1 warming system of the present invention comprises: a lubricating oil system LOS and an evaporative cycle refrigeration system VCS; the evaporation cycle refrigeration system includes: a heat exchanger 2 and a refrigerant-oil heat exchanger 3; the heat exchanger 2 is arranged in the cabin 1; an inlet of the heat exchanger 2 is communicated with a refrigerant outlet of the refrigerant-lubricating oil heat exchanger 3; a refrigerant inlet of the refrigerant-lubricating oil heat exchanger 3 is communicated with an outlet of the heat exchanger 2, and an oil inlet of the refrigerant-lubricating oil heat exchanger 3 is communicated with an oil outlet of the lubricating oil system; an oil inlet of the lubricating oil system is communicated with an oil outlet of the refrigerant-lubricating oil heat exchanger 3, when the cabin 1 needs to be heated, high-temperature lubricating oil in the lubricating oil system enters the refrigerant-lubricating oil heat exchanger 3, and the refrigerant and the high-temperature lubricating oil generate heat exchange in the refrigerant-lubricating oil heat exchanger 3 to form a high-temperature refrigerant; the high-temperature refrigerant enters the heat exchanger 2 to transfer heat to the cabin 1 to heat the cabin 1, and the lubricating oil after heat exchange enters the lubricating oil system.

As an alternative embodiment, the evaporation cycle refrigeration system further comprises: and an inlet of the compressor 5 is communicated with a refrigerant outlet of the refrigerant-lubricating oil heat exchanger 3, and an inlet of the heat exchanger 2 is communicated with an outlet of the compressor 5. Under the drive of the compressor 5, a heat pump cycle of compression, condensation (heat release), expansion and evaporation (heat absorption) is realized.

As an alternative embodiment, the evaporation cycle refrigeration system further comprises: and a refrigerant inlet of the evaporator 4 is communicated with an outlet of the heat exchanger 2, and a refrigerant outlet of the evaporator 4 is communicated with a refrigerant inlet of the refrigerant-lubricating oil heat exchanger 3.

As an alternative embodiment, the evaporation cycle refrigeration system further comprises: an expansion valve 6; the refrigerant inlet of the evaporator 4 is communicated with the outlet of the heat exchanger 2 through the expansion valve 6.

As an alternative embodiment, the oil system comprises: a lubricating oil tank 8 and an engine gearbox 10; an oil inlet of the refrigerant-lubricating oil heat exchanger 3 is communicated with an oil outlet of the engine gear box 10, an oil inlet of the engine gear box 10 is communicated with an oil outlet of the lubricating oil tank 8, and an oil inlet of the lubricating oil tank 8 is communicated with an oil outlet of the refrigerant-lubricating oil heat exchanger 3.

As an alternative embodiment, the oil system further comprises: a lubricating oil radiator 7; an oil inlet of the lubricating oil radiator 7 is communicated with an oil outlet of the engine gearbox 10; the oil outlet of the lubricating oil radiator 7 is respectively communicated with the oil inlet of the lubricating oil tank 8 and the oil inlet of the refrigerant-lubricating oil heat exchanger 3, when the cabin 1 needs to be cooled, lubricating oil does not flow into the VCS, and at the moment, after the engine gear box 10 heats the lubricating oil, the lubricating oil needs to be cooled by the lubricating oil radiator 7 and then flows back to the oil tank.

As an alternative embodiment, the oil system further comprises: a lubricating oil pump 9; an oil outlet of the lubricating oil radiator 7 is communicated with an oil inlet of the lubricating oil tank 8 through the lubricating oil pump 9, the lubricating oil is heated by the engine gearbox 10 under the pushing of the lubricating oil pump 9 and then enters the lubricating oil radiator 7 to be cooled, and then part of the lubricating oil is further cooled in the refrigerant-lubricating oil heat exchanger 3 to transfer heat to the VCS.

As an alternative embodiment, the oil system further comprises: a bypass valve 11; an oil inlet of the refrigerant-lubricating oil heat exchanger 3 is communicated with an oil outlet of the engine gear box 10 through the bypass valve 11, when the temperature of the cabin 1 needs to be raised, the bypass valve 11 is opened to enable high-temperature lubricating oil to flow into the VCS, the heat exchanger 2 in the VCS is a condenser at the moment, energy is transferred from the lubricating oil to the refrigerant, finally heat is transferred to air of the cabin 1 through the condenser, the cabin 1 is heated, when the cabin 1 needs to be cooled, the bypass valve 11 is closed, so that the lubricating oil cannot flow into the VCS, the refrigerant flows into the heat exchanger 2, the temperature of the cabin 1 is lowered, and the heat exchanger 2 at the moment is an evaporator.

As an alternative embodiment, the evaporation cycle refrigeration system further comprises: an air heater; the air inlet end of the air heater is communicated with the outside of the cabin; the air outlet end of the air heater is connected with the air inlet end of the evaporator 4; and the air outlet end of the evaporator 4 is communicated with the outside of the cabin.

In order to verify the performance of the aircraft cabin warming system (LOSVCS) provided by the embodiment, the LOSVCS ground simulation experiment system is constructed in the embodiment of the invention.

As shown in fig. 2, the loscscs ground simulation experiment system mainly comprises an Environmental Simulation System (ESS), a VCS, a LOS, and a Data Acquisition and Control System (DACS).

The ESS is mainly composed of an environmental simulation cabin and a cockpit 1. The environment simulation cabin can provide an atmospheric environment under set temperature and pressure, and a plurality of temperature and pressure measurement points are arranged in the environment simulation cabin and the cabin 1 for real-time monitoring.

The LOS of the LOSVCS ground simulation experiment system mainly comprises a lubricating oil tank 8, a lubricating oil pump 9, a lubricating oil flowmeter 13 and a heater 15 (because the engine cannot be directly used during the experiment, the lubricating oil can only be heated by the heater 15 to simulate the actual situation, and the lubricating oil is used for cooling a gear box in the actual application), and is coupled with the VCS through a refrigerant-lubricating oil heat exchanger 3. When LOS works, lubricating oil is pumped out from the oil tank, heated to a specified temperature by the heater 15 and finally enters the refrigerant-lubricating oil heat exchanger 3 to transfer heat to the refrigerant. When LOS does not work, no heat is exchanged between the lubricating oil and the coolant.

The loscscs ground simulation experiment system VCS is mainly composed of a compressor 5, a heat exchanger 2, a refrigerant flow meter 14, a capillary tube 12, and an evaporator 4. The heat exchanger 2 is arranged in the cabin 1, and the rest of the equipment is arranged in the environment simulation cabin. When the VCS is in the heat pump mode, the heat exchanger 2 is a condenser, and a two-phase refrigerant (refrigerant) absorbs heat from air or oil through the evaporator 4 and the refrigerant-oil heat exchanger 3 to become a gas, and then the gas is changed into a high-temperature and high-pressure gas through the compressor 5, and finally the heat (the heat absorbed from the heat source and the work done by the compressor 5) is transferred to the air in the cabin 1 through the condenser. When the VCS is in cooling mode, the LOS is off, and the dual mode VCS is the same as the single mode VCS, as opposed to heating mode, where the condenser inside the cabin 1 becomes the evaporator 4, absorbing the cabin 1 air heat and then exhausting outside the cabin by venting.

The DACS mainly comprises a temperature sensor T, a pressure sensor P, a lubricating oil flowmeter 13, a refrigerant flowmeter 14, a data acquisition module and the like. The temperature and pressure of the inlet and outlet of the compressor, the outlet of the heat exchanger 2, the inlet of the evaporator 4, the inlet of the refrigerant-lubricating oil heat exchanger 3, the temperature and pressure of the environment simulation cabin and the cabin are measured by using a temperature sensor T and a pressure sensor P, the temperature of the inlet and outlet of the lubricating oil of the refrigerant-lubricating oil heat exchanger 3 and the temperature of the lubricating oil tank 8 are measured by using the temperature sensor T, and the flow rates of the refrigerant and the lubricating oil are measured by using a lubricating oil flow meter 13 and a refrigerant flow meter 14.

The thermal process of the coolant loop of LOSVCS is shown in fig. 3, where a through B, B through C, C through D, D through a correspond to the compression, condensation, throttling and evaporation of the coolant, respectively. The thermodynamic states of the refrigerant at state points 2a, 2b, and 4a are saturated vapor, saturated liquid, and saturated vapor, respectively.

Technical effects of the invention

(1) Based on the dual-carbon target design, air does not need to be led from the engine, the power loss of the engine is reduced, the fuel consumption in flight is reduced, and therefore carbon emission is reduced.

(2) The design concept of comprehensive thermal management of the aircraft is introduced, the energy utilization efficiency of the aircraft system is further improved, and the reduction of carbon emission is also facilitated.

(3) The VCS is coupled and associated with the LOS, the lubricating oil heat is recovered and used for cabin heating, and performance experiments and thermodynamic analysis show that the LOSVCS is feasible, reliable, efficient and energy-saving.

(4) The novel aircraft cabin heating system provided by the invention is efficient and energy-saving, and does not need to bleed air from an engine, so that the fuel consumption can be reduced by at least 5% by estimation.

(5) The invention also contemplates waste heat recovery from other heat sources on the aircraft, such as waste heat from electronic equipment and engine exhaust.

(6) Other ways of utilizing the recovered heat, such as warming and anti-icing and demisting for cabin glass, warming and anti-freezing for waste water pipelines, etc., can also be explored.

The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.

The principles and embodiments of the present invention have been described herein using specific examples, which are provided only to help understand the method and the core concept of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In view of the above, the present disclosure should not be construed as limiting the invention.