KR20230073398A - Water thermal seat for automobile - Google Patents

Abstract

The present invention relates to a water thermal seat for a vehicle, which corresponds to the indoor temperature of a vehicle and the discharge temperature of a vent according to seasons such that the indoor driving condition of the vehicle may be quickly converted from an unpleasant condition to a pleasant condition for the driver. To this end, the temperature between the driver and the contact portion of the seat may be controlled such that thermal pleasantness may be more effectively provided to the driver, thereby providing a pleasant driving environment and increasing concentration in driving. To this end, the water thermal seat for a vehicle according to the present invention comprises: a water tank (20) which stores raw water to supply cold and hot water; a pump (30) which supplies the raw water stored in the water tank (20) at a predetermined pressure; a Peltier module (40) which cools or heats the raw water supplied by means of the pump (30) at a predetermined temperature; a seat (70) which is made of a synthetic resin material with elasticity to allow the cooled or heated raw water may flow, and in which a pipe is installed; and a control unit (10) which outputs a control signal to operate the pump (30) and the Peltier module (40).

Description

Water thermal seat for automobile {WATER THERMAL SEAT FOR AUTOMOBILE}

The present invention relates to a heat-receiving seat for a vehicle, and more particularly, can rapidly change the interior driving conditions of a vehicle from an unpleasant condition to a comfortable condition for a driver in response to the temperature of the vehicle's interior and the discharge temperature of a vent according to the season. The present invention relates to a heat-receiving seat for a vehicle, which provides a more effective thermal comfort to the driver by controlling the temperature of a contact portion between the driver and the seat so as to increase a pleasant driving environment and concentration on driving.

With the goal of commercialization of self-driving cars currently being developed, technology is developing rapidly along with an increase in investment in major technologies related to self-driving. In the case of self-driving cars, safety issues are the most important, but at the same time, providing comfort to the driver or passengers and managing energy inside the car are also very important. In addition, since electric vehicles use electricity to control the HVAC (Heating, Ventilation, Air Conditioning) system, the air flow and temperature distribution in the cabin are very important for effective cooling and heating. In order to save energy sources, an efficient vehicle air conditioning system development and control method is required.

This makes heat pumps an attractive option for use in electric vehicle HVAC systems because of their low energy consumption in electric vehicles. Better control and operation in electric vehicles is another important technology to improve the performance of heat pump HVAC systems. Moreover, if integrated thermal management is realized in EVs, it is necessary to develop control and driving technologies not only for energy saving but also for future automobiles. In addition, as fuel economy requirements are strengthened and the spread of EVs increases, the thermal comfort issue of passengers is becoming more and more important in energy management.

Particularly, in summer, solar energy introduced through a window or the like in a car interior rapidly raises the temperature inside the car and at the same time directly transmits radiant energy to the driver. As a result, the interior temperature of a vehicle rises up to 85°C in summer, and the surface temperature of a vehicle dashboard exposed to direct sunlight reaches a maximum of 100°C.

The sudden temperature increase in the interior of the vehicle and the direct transfer of radiant energy to the driver provide a very large discomfort to the driver. Driving for a long time in summer causes discomfort or drowsiness to drivers, which increases the incidence of traffic accidents, and excessive use of air conditioners causes health problems for occupants. In addition, when riding a car in winter, the seat feels cold, and accordingly, the occupant excessively uses the heater. Excessive use of a heater in a car in winter can reduce concentration of driving and cause drowsiness due to reduced oxygen, and direct exposure to the heater wind on the face can cause skin aging such as wrinkles and melasma due to very dry skin.

On the other hand, the HAVC system consisting of an air conditioner and a heater is provided to adjust the interior temperature of the vehicle, but the temperature of the seat of the vehicle cannot be adjusted. Accordingly, in the summer or winter, even if the driver or passenger operates the air conditioner or heater while sitting on the seat, the seat is cooled relatively slowly or remains cool for a long time compared to the interior. Because of this, a driver or passenger seated in the seat feels sweaty, chilly, or cold on his buttocks and back.

Accordingly, in order to improve driving comfort, there is an increasing tendency to install a cooling and heating device on the seat of a vehicle. In the early heating method, heating was performed by applying electricity while a heating wire or a planar heating element was attached to the seat of the vehicle. However, in recent years, high-spec automobile seats have been equipped with thermoelectric elements to adjust the temperature of the vehicle seats due to problems in that it is not easy to find the cause of the occurrence of electromagnetic waves and malfunctions.

Such a thermoelectric element is an element used for cooling and heating supply, and is generally composed of a plurality of pairs of p-type thermoelectric semiconductor and n-type thermoelectric semiconductor connected in series. When DC voltage is applied to the thermoelectric element, one side of the thermoelectric element Endothermic heat is generated, resulting in a low temperature, and the opposite side is exothermic, resulting in a high temperature. In addition, airflow is generated on each of the low-temperature and high-temperature surfaces of the thermoelectric element using a heat transfer fin medium, a heat dissipation fin, and a blower, fan, or pump to obtain a cooling effect from the airflow passing through the heat transfer fin medium on the low temperature surface of the thermoelectric element. It is a structure that obtains a heating effect from the airflow passing through the face heat transfer fin medium.

Korean Patent Publication No. 10-2021-0065910 (2021.06.04) proposes a cooling and heating supply system for a vehicle seat capable of implementing high-efficiency heating performance.

Looking at this, a vehicle seat installed inside the vehicle for the user to sit on, an air supply unit integrally formed or separately installed inside the vehicle seat and providing a preset air supply path to the inside of the vehicle seat, and the air A thermoelectric module unit that is coupled to the inlet of the supply unit and forcibly sucks air from the outside according to a user's operation to heat or cool it and supplies it to the air supply unit, and is installed on the reaction side of the thermoelectric module unit, An electric heating element that automatically applies heat to a reaction side when the temperature exceeds a preset temperature range, and a first installed in the thermoelectric module unit to measure the temperature of the air supplied to the air supply unit and the interior temperature of the vehicle. A temperature sensing unit including a temperature sensor, a second temperature sensor, and a third temperature sensor installed on the vehicle seat, installed inside the vehicle, and configured by the user in a heating mode or a cooling mode and each mode air passing through the thermoelectric module unit is heated or cooled by controlling the direction of direct current applied to the thermoelectric module unit according to the manipulation of the control unit and the operation unit, and in the heating mode, the external temperature and the thermoelectric module unit and a controller configured to control the temperature deviation by heating the electric heating element installed on the reaction side of the thermoelectric module unit when the temperature of the reaction side is out of a preset temperature range, wherein the thermoelectric module unit includes an upper case and a lower case in a vertical direction. As they are coupled to each other, an installation space is formed inside, an air inlet is formed at one end to suck in external air, and an air inlet is formed on the upper side of the other end to supply air passing through the working side of the thermoelectric module unit to the air supply unit. A case in which a first air outlet coupled to the inlet of the supply unit is formed, and a second air outlet is formed at the other end to discharge air passing through the reaction side of the thermoelectric module unit, and an installation space formed inside the case. The working surface is disposed on the upper side and the reaction surface is located on the lower side, and the working surface generates heat or absorbs heat according to the control of the controller, and an upper heat sink covering the working surface of the thermoelectric element It is composed of a lower heat sink that surrounds the reaction surface of the thermoelectric element, and is mounted on the front end of the heat sink and the lower heat sink mounted in the installation space formed inside the heat sink and the heat sink that emits heat generated from the thermoelectric element to the outside, It is configured to include a blower unit having a first blower that forcibly generates wind under the control of the controller and supplies it to the upper heat sink and a second blower to supply it to the lower heat sink.

However, such prior art has limitations in providing suitable thermal comfort to the driver. In other words, since the direction of the air, the temperature and wind speed of the discharged air, and the amount of solar radiation from the outside continuously change during driving, the indoor thermal environment of a car is relatively more variable and non-uniform due to external influences than buildings or offices. is also high It is very important to provide appropriate thermal comfort to the driver through the HVAC system in the continuously changing thermal environment of the vehicle interior.

Currently, the technology for the thermal comfort of the human body continues to be studied according to various environmental changes inside the building, but research on the thermal comfort of the occupants inside the vehicle is insufficient. It is currently in the analysis of thermal comfort. This is because the thermal environment of the indoor building has a uniform temperature distribution, but the thermal environment inside the vehicle has a very non-uniform temperature distribution and changes very quickly according to changes in the external environment. In addition, the volume ratio between the building and the car is about 10:1 due to the narrow indoor space, the perceived distance of the discharged airflow, the variability caused by the external environment such as solar radiation and humidity, and the airflow obstruction due to the shape of the internal structure. In summer, the cooling capacity per unit volume is required more than 20 times. Therefore, a new technology for saving energy and satisfying the thermal comfort of occupants is required.

The present invention has been proposed to solve the above problems, and hot and cold environments such as summer and winter initially provide a very unpleasant environment for passengers, and excessive use of air conditioners and heaters adversely affects the health of passengers. causes Therefore, the present invention provides a heat-receiving seat for a vehicle that can improve thermal comfort more effectively than a ventilated seat and a heated seat in a vehicle seat, ensure safety, and rapidly control the temperature of the seat to be close to room temperature. There is a purpose.

The problems to be solved by the present invention are not limited to the above-mentioned problems, and other problems not mentioned will be clearly understood by those skilled in the art from the following description.

In order to achieve the above object, a heat-receiving sheet for a vehicle according to the present invention includes a water tank 20 for storing raw water for supplying cold and hot water, and a pump for supplying raw water stored in the water tank 20 at a constant pressure. (30), a Peltier module (40) for cooling or heating the raw water supplied through the pump (30) to a constant temperature, and a synthetic resin material having elasticity through which the cooled or heated raw water can flow. It is preferable to include a seat 70 in which a pipe is installed, and a control unit 10 that outputs a control signal for driving the pump 30 and the Peltier module 40.

In addition, an interior temperature sensor 90 for measuring the interior temperature of the vehicle and a seat temperature sensor 80 for measuring the temperature between the seat 70 and the occupant are included, and the control unit 10, Information on cold air or warmth through the HVAC (Heating, Ventilation, Air Conditioning, 60) system of the vehicle and signals from the indoor temperature sensor 90 and the seat temperature sensor 80 are received, and the seat temperature sensor ( It is preferable to perform a function of controlling the measured temperature of 80) to reach a set temperature through the HVAC 60.

Meanwhile, the control unit 10 controls driving of the Peltier module 40 and the pump 30 according to the temperature measured by the room temperature sensor 90 and receives a signal from the seat temperature sensor 80 as feedback. It can perform a function of controlling driving of the peltier module 40 and the pump 30 .

As described above, according to the present invention, there is an effect of lowering the surface temperature of all body surfaces of the driver in the summer indoor condition than that of the basic seat. In particular, the surface temperatures of the back and buttocks in contact with the seat are 6.15°C and 4.28°C lower than the basic sheet, respectively, after 30 minutes, so the surface temperature of all body parts can be reduced by 2.96°C on average compared to the basic sheet. Therefore, the use of the heat-receiving sheet according to the present invention has an effect of providing a comfortable environment to the driver by lowering the surface temperature of the back and buttocks, which are contact parts with the driver's seat, where cold air from the air conditioner cannot be transmitted.

Meanwhile, the surface temperature of the heat-receiving sheet according to the present invention can be 1.55° C. higher than that of the basic sheet on average in winter conditions in the interior of a vehicle. In particular, the surface temperature of the back and buttocks in contact with the seat is 1.6°C and 2.06°C higher than the basic seat, respectively, after 30 minutes have elapsed. The use of the heat-retaining seat has the effect of providing a relatively comfortable environment for the driver by increasing the surface temperature of the back and buttocks, which are contact parts with the driver's seat.

1 is a control block diagram of a heat-receiving seat for a vehicle according to the present invention;
Figure 2 is a piping of a vehicle seat according to an embodiment of the present invention,
3a and 3b are positions of a seat temperature sensor mounted on a seat according to an embodiment of the present invention;
4A and 4B are graphs showing the surface temperature of each body part of a driver according to the use of a conventional base sheet and a heat-receiving sheet according to an embodiment of the present invention in a vehicle interior condition in summer;
5 is a graph showing PMV (Predicted mean vote) and PPD (Predicted percentage dissatisfied index) results for the vehicle interior thermal environment in summer in the case of using a heat-receiving sheet according to the present invention;
6A and 6B are graphs showing the surface temperature of each body part of a driver according to the use of a conventional base sheet and a heat-receiving sheet according to an embodiment of the present invention in winter conditions in an automobile interior;
7 is a graph showing PMV (Predicted mean vote) and PPD (Predicted percentage dissatisfied index) results for the vehicle's indoor thermal environment in the winter vehicle's interior conditions when the heat-receiving sheet according to the present invention is used.

Hereinafter, a heat-receiving sheet for a vehicle and a control method thereof according to the present invention will be described in detail with reference to the accompanying drawings.

1 is a control block diagram of a heat-receiving seat for a vehicle according to the present invention, FIG. 2 is a pipe of a seat for a vehicle according to an embodiment of the present invention, and FIGS. 3A and 3B are sheets according to an embodiment of the present invention. This is the location diagram of the seat temperature sensor mounted on the

4A and 4B are graphs showing the surface temperature of each body part of a driver according to the use of a conventional basic sheet and a heat-receiving sheet according to an embodiment of the present invention in a vehicle interior condition in summer, and FIG. 5 is a graph of the present invention. A graph showing PMV (Predicted mean vote) and PPD (Predicted percentage dissatisfied index) results for the vehicle interior thermal environment in the summer vehicle interior conditions in the case of using the heat-receiving sheet by is a graph showing the surface temperature of each body part of a driver according to the use of a conventional base sheet and a heat-receiving sheet according to an embodiment of the present invention, and FIG. 7 is a car interior in winter when the heat-receiving sheet according to the present invention is used It is a graph showing the PMV (Predicted mean vote) and PPD (Predicted percentage dissatisfied index) results for the thermal environment inside the vehicle under the condition.

In adding quotation marks to the components of the drawings, even if they are displayed on different drawings, only the same components have the same symbols as possible, and known functions that are determined to unnecessarily obscure the subject matter of the present invention. And a detailed description of the configuration is omitted. Also, directional terms such as 'top', 'bottom', 'front', 'back', 'lead', 'front', 'rear', etc. are used in relation to the orientation of the disclosed figure(s). Because components of embodiments of the present invention may be positioned in a variety of orientations, directional terms are used for purposes of illustration and not limitation.

As shown in FIGS. 1 to 3B, a heat-receiving seat for a vehicle according to a preferred embodiment of the present invention includes a water tank 20 for storing raw water for supplying cold and hot water to a seat 70 of a vehicle, A pump 30 for supplying the raw water stored in the water tank 20 to the seat 70 at a constant pressure, and a Peltier module for cooling or heating the raw water supplied through the pump 30 to a constant temperature ( 40) and a controller 10 outputting a control signal for driving the pump 30 and the Peltier module 40.

In addition, the indoor temperature sensor 90 for measuring the indoor temperature of the vehicle and the seat temperature sensor 80 for measuring the temperature between the seat 70 and the seated occupant transmit measurement signals to the control unit 10. and a power supply unit 50 for supplying power to the water tank 20, the pump 30, the Peltier module 40, the control unit 10, and the sensor by receiving power from the vehicle. .

Meanwhile, the vehicle is equipped with a heating, ventilation, air conditioning (HVAC) system 60, and the control unit 10 receives information about cold air or warm air discharged from the HVAC 60.

As shown in FIG. 2, the seat 70 is configured with pipes installed therein. The pipe is preferably composed of a synthetic resin material having elasticity enough to allow the raw water to flow against the pressure of the seated person. The present invention is intended to improve the thermal comfort of the seated person by first flowing cold water or hot water toward the back and buttocks of the seated person in contact with the seat in summer and winter, and is not limited to the arrangement of pipes shown in FIG. You can have a structure.

3A and 3B show the position of the seat temperature sensor 80 mounted on the seat 70, FIG. 3A shows the back of the seat, and FIG. 3B shows the hip part of the seat. .

In one embodiment of the present invention, the seat temperature sensor 80 is installed at intervals of 10 cm to more accurately measure the temperature change of the seated person's back and buttocks, but is not limited thereto.

The Peltier module 40 is an element used for supplying cooling water or heating water, and is generally composed of a plurality of pairs of p-type thermoelectric semiconductors and n-type thermoelectric semiconductors connected in series. One side of the element generates heat and becomes low temperature, and the other side generates heat and becomes high temperature. In addition, raw water is brought into contact with each of the low-temperature and high-temperature surfaces of the thermoelectric element using the pump 30 to obtain cooling water through the low-temperature surface and heating water through the high-temperature surface of the thermoelectric element.

In the present invention, when the indoor temperature is set to 15 ° C through the HVAC system 60 of the vehicle in summer, the air conditioner of the HVAC system 60 supplies cold air through the vent to lower the indoor temperature of the vehicle. . Meanwhile, when the driver sets the indoor temperature through the HVAC system 60, the Peltier module 40 is driven according to the set temperature to supply cooling water to the seat 70.

When the indoor temperature decreases due to the operation of the air conditioner of the HVAC system 60, it is measured through the indoor temperature sensor 90, and the measured temperature signal is input to the control unit 10 to provide a feedback signal to the HVAC system 60. transfer to maintain a constant temperature.

However, although the interior temperature of the vehicle is lowered by the air conditioner of the HVAC system 60, the seat temperature of the driver or passengers does not decrease. That is, the seat of the vehicle is not affected by the air conditioner by the occupant and the temperature is not lowered by heat generated from the human body.

Therefore, due to the temperature difference between the interior temperature of the car and the back and buttocks of the occupants? Various problems occur, and an unpleasant driving environment is created for the driver.

However, since cooling water is supplied to the seat 70 separately from the HVAC system 60, the temperature of the seated person's back and buttocks can be quickly lowered.

In other words, the control unit 10 receives information about cold air or warm air through the HVAC 60 system, so that the measured temperature of the seat temperature sensor 80 reaches the set temperature through the HVAC 60. perform a control function.

Meanwhile, the control unit 10 controls driving of the Peltier module 40 and the pump 30 according to the temperature measured by the room temperature sensor 90, receives a signal from the seat temperature sensor 80 as feedback, and It can perform a function of controlling driving of the peltier module 40 and the pump 30 .

As a method for predicting the thermal comfort of occupants in the interior of a vehicle as described above, a psychological model through a subjective survey technique and a physiological model using biosignals such as brain waves, pulse waves, and skin temperature are simultaneously applied to the thermal comfort of the human body. Quantitative data are needed for

Hot and cold environments, such as summer and winter, initially provide occupants with a very unpleasant environment, and excessive use of air conditioners and heaters adversely affects occupants' health. Therefore, a ventilated seat and a heated seat are installed in the vehicle seat. However, the ventilation seat installed in the existing automobile blows air to the occupant's back using the ambient wind. Since only the ambient air blows, there is no temperature change and it is difficult to provide a comfortable environment to the driver in the beginning.

The heated seat of a vehicle warms the seat with a heat wire in winter, and electromagnetic waves generated at this time may have a harmful effect on the human body, and excessive use of the heated seat may cause a risk of fire and burns.

Therefore, the present invention proposes a heat-receiving seat that more effectively improves thermal comfort and guarantees safety than a ventilated seat and a heated seat in a vehicle seat.

Looking at an analytical study on thermal comfort in a conventional vehicle thermal environment, Hodder et al. [Hodder, SG, Parsons, K., 2007, The effects of solar radiation on thermal comfort, Int. J Biometeoral, Vol. 51, pp. 51; 233-250] performed a thermal flow analysis of the interior of a car in consideration of insolation in order to understand the effect of the sun's spectrum type and glass's physical properties (absorption rate, transmittance, etc.) on thermal comfort. When exposing the body to simulated solar radiation of 400 W/m ² , the spectral content of the radiation did not affect the thermal sensations of practical importance, and thermal comfort improved with each increase in solar radiation of about 200 W/m ² . It was reported that it increased by 1 scale. Chien et al. [Chien, H., Jang, JY, Chen, YH, Wu, SC, 2008, 3-D numerical and experimental analysis for airflow within a passenger compartment, International Journal of Automotive Technology, Vol. 9, no. 4, p. 437-445] verified the validity of the analysis results based on the experimental results for the analysis of the thermal environment inside the vehicle considering the occupants, and performed the thermal comfort evaluation using the PMV evaluation method. After turning on the A/C, it was confirmed that the average temperature in the car interior rapidly decreased, and it was reported that the PMV value for 1200 seconds showed discomfort only in the feet. Lin et al. [Lin, CH, Han, T., Koromilas, CA, 1992, Effects of HVAC Design Parameters on Passenger Thermal Comfort, SAE920264] reported that the temperature of the vehicle interior depends on the flow rate and location of the air conditioner outlet and the location of the air outlet. An analysis of the environment was performed, and it was confirmed that the location of the A/C vent and the air volume of the total system were the most important parameters affecting thermal comfort. In addition, considering the solar heat load, which is the main heat source for occupants, it was confirmed that it can be reduced with the glass properties. Kobayashi et al. [Kobayashi, Y, T, K., MORI, Y, J., Yoshimura, S, N, C., Tanabe, S, N, C., and Oi, H, J, M., 2012 , Thermal comfort in car cabin with cooling individual body parts, 10th International Conference on Healthy Buildings, Vol. 2 of 3, pp 1030] set the air flow direction for four cases: head, head and feet, chest, chest and feet, and compared them with Zhang's model. As a result, it was confirmed that the estimation of local thermal sensation by the Zhang model was accurate. However, it was confirmed that the evaluation of overall sensation and local/global comfort is still inaccurate and needs improvement. Zhang et al. [Zhang, H., Lan, D., Xu, G., Li, Y., Chen, W., Tao, WQ, 2009, Studies of air-flow and temperature fields inside a passenger compartment for improving thermal comfort and saving energy. Part I: Test/numerical model and validation, Applied Thermal Engineering, Vol. 29, Issue 10, pp. 2022-2027] performed an analysis of the thermal environment of the vehicle interior, and compared the experimental results with the numerical analysis results. As a result, it was confirmed that the experimental and predicted temperature values and distribution tendencies were in good agreement.

However, existing studies on biosignals have been conducted mainly in the medical field, and studies on biosignals in automobiles have been conducted mainly to prevent drowsiness and to check only the driver's health status, and the human body while driving in a car space. The bio-signals of the human body continuously change, so there is a lack of data on the effect of thermal comfort through heating and cooling as well as driving conditions on the human body. Accordingly, the present invention provides thermal comfort to the driver while driving and improves concentration on driving.

First, FIGS. 4A and 4B show the surface temperature of each body part of a driver according to the use of a conventional basic sheet and a heat-receiving sheet according to the present invention in a vehicle interior condition in summer.

FIG. 4A shows the surface temperature of each body part of the driver when the base sheet is used in the indoor condition of the vehicle in summer. When the basic seat was used during cooling driving in summer, the surface temperature of the driver's back and buttocks was high, and showed a tendency to gradually increase as time passed. However, the surface temperature of all body surfaces except for the back and buttocks showed a tendency to gradually decrease over time. In particular, the surface temperature of the hands, feet, and head showed a large decrease in temperature due to the direct effect of the air conditioner. It is judged that the cooling operation of the air conditioner lowered the surface temperature of the driver and provided a pleasant environment during the cooling operation in summer. However, it was confirmed that there was no significant effect on the part of the back and hip that came into contact with the driver's seat.

FIG. 4B shows the surface temperature of each body part of a driver when the heat-receiving sheet according to the present invention is used in a vehicle interior condition in summer. It was confirmed that the surface temperature of all the body surfaces of the driver was lower than that of the basic seat when the hydrothermal seat was used. In particular, it was confirmed that the surface temperature of the back and buttocks in contact with the heat treatment sheet was 6.15°C and 4.28°C lower than the basic sheet, respectively, after 30 minutes had elapsed, and the surface temperature of all body parts was also 2.96°C lower than the basic sheet on average. appeared to decrease. It was confirmed that the use of the heat-receiving seat provided a comfortable environment for the driver by lowering the surface temperature of the back and buttocks, which are contact parts with the driver's seat, where cold air from the air conditioner cannot be delivered.

FIG. 5 shows PMV (Predicted mean vote) and PPD (Predicted percentage dissatisfied index) results for the vehicle interior thermal environment when a basic sheet and a heat-receiving sheet are used in a vehicle interior condition in summer. When the basic sheet was applied, the PMV was 2.14 at 5 minutes, indicating a hot environment, and the PPD was 82.7%. When 20 minutes elapsed, PMV slightly decreased to 1.96, and PPD showed 75.2%. When 30 minutes had elapsed, the PMV was 1.91 and the PPD was 72.7%, confirming that the interior environment of the car was still in a hot environment. On the other hand, when the hydrothermal sheet was used, the PMV was 1.82 at 5 minutes, and the PPD was 68.3%. This confirmed that the level of dissatisfaction can be greatly reduced with a PPD 14.4% lower than the use of the basic sheet. When 20 minutes had elapsed, the PMV was 1.55 and the PPD was 53.9%, indicating that the thermal environment inside the car was slightly hot. In addition, when 30 minutes had elapsed, the PMV was 1.47 and the PPD was 49.3%. At this time, when compared with the basic sheet, the PPD was 23.4% lower, and through this, it was confirmed that the expected dissatisfaction was greatly reduced.

Therefore, it was confirmed that the use of the heat-receiving sheet according to the present invention can significantly lower PMV and PPD, and provide a relatively thermally comfortable environment to the driver.

6A and 6B show the surface temperature of each body part of a driver according to the use of a base sheet and a heat-receiving sheet in an indoor condition of a vehicle in winter.

FIG. 6A shows the surface temperature of each body part of a driver when a basic seat is used in an automobile indoor condition in winter. When using the basic seat, the surface temperature of the driver's back and buttocks slightly increased over time. It is judged that the temperature is relatively increased because it is in contact with the driver's seat, which has a small heat loss. When 30 minutes had elapsed, the surface temperatures of the head, hands, and feet were 30.5°C, 33.9°C, and 35.1°C, respectively, showing the highest surface temperature. This is because the high-temperature vent outlet air is discharged toward the head and feet, and the hand is located on the handle.

6B shows the surface temperature of each body part of a driver when a heat-receiving sheet is used in an indoor condition of a vehicle in winter. It was confirmed that the surface temperature of the driver's body over time was 1.55 ° C higher than that of the basic seat when using the thermal seat. In particular, it was confirmed that the surface temperature of the back and buttocks in contact with the thermal sheet was 1.6°C and 2.06°C higher than the basic sheet, respectively, after 30 minutes had elapsed, and the surface temperature of all body parts was 1.97°C higher than the basic sheet on average. appeared high. It was confirmed that the use of a hydrothermal seat during winter driving provides a relatively comfortable environment for the driver by increasing the surface temperature of the back and hip, which are contact parts with the driver's seat.

FIG. 7 shows PMV (Predicted mean vote) and PPD (Predicted percentage dissatisfied index) results for the vehicle interior thermal environment when a heat-receiving sheet is used in the vehicle interior condition in winter. When the base sheet was applied, the PMV was -0.69 at 5 minutes, and the PPD was 14.9%. When 20 minutes elapsed, PMV slightly decreased to -0.56, and PPD showed 11.6%. In addition, when 30 minutes had elapsed, the PMV was -0.49 and the PPD was 10.1%. In general, a PPD between -10% and 10% is considered comfortable. However, even after 30 minutes had elapsed, the PPD of the vehicle interior environment was 10.1%, confirming that there was some discomfort. When using the hydrothermal sheet, the PMV was -0.22 after 5 minutes, and the PPD was 6%. This confirmed that the PPD was 8.9% lower than when using the basic sheet, which could greatly reduce the degree of dissatisfaction. When 20 minutes had elapsed, the PMV was -0.07, and the PPD was 5.1%. In addition, when 30 minutes had elapsed, the PMV was 0.02 and the PPD was 5.0%. The comfortable range of PMV defined by ASHRAE is -0.5 to 0.5 and PPD is less than 10%. It was confirmed that the use of a heated seat in the driver's seat in winter provides a thermally comfortable environment to the driver as both PMV and PPD are included in the comfortable range.

The embodiments of the present invention described above and shown in the drawings should not be construed as limiting the technical spirit of the present invention. The protection scope of the present invention is limited only by the matters described in the claims, and those skilled in the art can improve and change the technical spirit of the present invention in various forms. Therefore, these improvements and changes will fall within the protection scope of the present invention if they are obvious to those skilled in the art.

10: control unit 20: water tank
30: pump 40: Peltier module
50: power unit 60: HVAC
70: seat 80: seat temperature sensor
90: room temperature sensor

Claims (3)

A water tank 20 for storing raw water for supplying cold and hot water, a pump 30 for supplying the raw water stored in the water tank 20 at a constant pressure, and the raw water supplied through the pump 30 at a constant pressure. A Peltier module 40 for cooling or heating to a temperature, a seat 70 made of a synthetic resin material having elasticity through which the cooled or heated raw water can flow, and a pipe installed therein, and the pump 30 And a control unit 10 for outputting a control signal for driving the Peltier module 40.
The method of claim 1,
An interior temperature sensor 90 for measuring the interior temperature of the vehicle and a seat temperature sensor 80 for measuring the temperature between the seat 70 and the occupant,
The control unit 10 inputs information about cold or warm air through the HVAC (Heating, Ventilation, Air Conditioning, 60) system of the vehicle and signals from the room temperature sensor 90 and the seat temperature sensor 80. receiving and controlling the temperature measured by the seat temperature sensor 80 to reach the temperature set through the HVAC 60.
According to claim 1 or claim 2,
The control unit 10 controls driving of the Peltier module 40 and the pump 30 according to the temperature measured by the room temperature sensor 90, receives a signal from the seat temperature sensor 80 as feedback, and controls the operation of the Peltier A heat-receiving seat for a vehicle, characterized in that it performs a function of controlling the driving of the module 40 and the pump 30.

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