Seat Heating & Ventilation Technology Application
The ventilation system is intended to improve the surface temperature of the seat in the hot season so that the driver and passengers feel comfortable, and at the same time, it also avoids the uncomfortable feeling of the body’s buttocks and back when driving for a long time. The seat ventilation system has also become an irreplaceable car comfort performance configuration.
Warmtech can provide professional fan design solutions, designed according to customer needs through patent technology with high-efficiency silent centrifugal fan, under the same noise conditions, the air volume is larger, and the air volume is more than 30% higher. Designed as fire resistance/Prohibited substances to meet global laws and regulations, and customer technical requirements.
The standard control method is a mechanical button switch is arranged on the side panel of the seat cushion, and Lin/Can communication can also be added to realize the central control Pad or voice control. An advanced design solution is a wireless touch input switch assembly that can be attached to any ergonomically surface in the vehicle.
A basic in-market layout scheme is where airflow passes through the 3D mesh cloth and through the non-woven ventilation holes to achieve the effect of blowing and suction. At present, the layout of the fan + air bag scheme in the market is basically a B-side structure.
One design arrangement is that the fan is embedded in the foam, and the air flows out through the 3D mesh, which increases the flow area. Since the 3D mesh is open, the air volume felt by the human body is less.
The Massage System is formed by air pump assembly air valve assembly air circuit ECU controller switch and massage airbag. By pressing the switch, the ECU (including the program) controls the programmed on-off of the air pump in the air source assembly and the solenoid valve in the air circuit controller, so as to programmatically inflate and deflate the massage airbag to realize the massage function.
Temperature Control Solutions
Zhejiang Warmtech Technology Co., Ltd
Warmtech specializes in car seat driving comfort, R&D, production and sales. Currently also working with manufacturers in the electronics industry to develop functional components, heating elements, smart textiles, and other products for various devices (including sensors).Through their proprietary micron metal materials, printing capabilities and technical ability they have ability to transform micron conductive manufacturing technology from concept to commercial application.
HEATED STEERING WHEEL DESIGN
A warm and comfortable steering wheel is essential for driving safety – integrated flexible, ultra-thin components and thermal systems into the steering wheel to supply a uniform and moderate temperature thermal comfort experience on leather and wooden surfaces. The thermal management system can cover any car interior surface, in addition to seats and steering wheels, it can also heat the door panels, armrests, center console, seat backs, headrests and other areas.
- Quick warm-up, no need to start the engine.
- Constant temperature heating, enjoy thermal comfort.
- Comprehensive and efficient thermal management, saving 60% of energy consumption.
The system is turned on or off by heating buttons on the steering wheel, which are usually distributed around the steering wheel or on the center console. Heating system composed of heating elements, control switches, temperature sensors, and control modules.
Solution # 1:
Use resistance wire to generate heat. A layer of resistance wire is placed in the leather wrapped by the steering wheel, and the power cord supplies power to the resistance wire through the
part under the steering wheel that is connected to the shaft. The focus of the steering wheel heating is the 3 o’clock and 9 o’clock directions of the steering wheel, that is, the heating of the hand-held area. A layer of resistance wire is placed in the leather wrapped by the steering wheel, and the power cord supplies power to the resistance wire through the part under the steering wheel that is connected to the shaft. The focus of the steering wheel heating is the 3 o’clock and 9 o’clock directions of the steering wheel, that is, the heating of the hand-held area.
Solution # 2:
Adopt conductive polymer PTC heater. Allows sufficient temperature level without any temperature controller (such as a thermostat). At low temperatures, as the resistance drops, it
will quickly heat up. At elevated temperatures, as the resistance increases, it can prevent overheating and overcurrent. -It has very low power consumption due to the PTC function with preventive function. Therefore, it can prevent overheating. The thickness is less than 0.3mm. It is small and light and can be easily installed and managed.
- It allows to keep a sufficient temperature level without any temperature controller (such as a thermostat).
- At low temperatures, as the resistance drops, it will quickly heat up. At elevated temperatures, as the resistance increases, it can prevent overheating and overcurrent.
- It has very low power consumption due to the PTC function with preventive function. Therefore, it can prevent overheating.
- The thickness is less than 0.3mm. It is small and light and can be easily installed and managed.
Solution # 3:
Carbon nanotube heating film is a one-dimensional quantum material with a radial size of nanometers and an axial size of micrometers. Carbon nanotubes are mainly composed of carbon atoms arranged in a hexagonal shape to form coaxial circular tubes with several to tens of layers. Keep a fixed distance between layers, about 0.34nm, and the diameter is generally 2-20 nm. Carbon nanotubes can also be regarded as seamless and hollow nano-scale tubes formed by curling graphene sheets.
Advantage:
- The carbon nanotube heating film is a surface heating technology with uniform heating.
- The far-infrared band compatible with the human body is easy for human body to absorb.
- The temperature rises quickly, and the rate can reach 2°C/S.
Solution # 4:
Looking back at the heat sink analogy we notice that one way to lower thermal resistance is to increase the size, specifically the area of the heat sink. Even if our wire has a sufficient wattage the small cross-sectional size can increase thermal resistance and reduce efficiency. If the wire shape was changed from round to thin and flat (more like a heat sink) then thermal resistance could be greatly reduced. This thin flat profile gives printed heating elements a great advantage over the small round wire shape. Another negative effect of the round wire is the non-conformal profile it has and thus heat path of a wire does not tell the whole story. Printed heater heaters lay flat and have a profile that is highly conformal. It may seem hard to understand why a printed heater using the same input power could give better results than a wire heater, but when the model is considered in terms of thermal resistance the advantages become clear.
For more information contact designhmi@gmail.com.
Seat Ventilation System
At present, there are two mainstream ways of fan ventilation in the market: Blowing and Suction.
Suction System: Airflow flows from side A to side B of the seat, the ventilation system takes away the body heat to achieve the purpose of cooling.
Blowing System: Air flow flows from side B to side A of the seat, and the ventilation system directly blows the air volume to the human body to achieve the purpose of cooling down.
Below are the different layout types in the market:
- Fan + Ventilation Bag: This form is the mainstream form of the current market. The blowing and suction are mostly arranged in this way. The airflow passes through the 3D mesh and through the non-woven vents to achieves the effect of blowing and suction function.
- Fan + Layered Structure: Fan is built-in foam, air flow through the whole 3D mech, the ventilation area is enlarged, also due to the 3D mesh is widely open, so people feel less wind.
- Fan Embedded in Airbag: This type belongs to fan embedded in air bag type, mostly used on seat foaming A side, the current market fan + air bag type basically on B-side structure, the applicability is not strong, the use of such structure is in the case of special requirements.
Advantages of Warmtech Fan & Assembly Design:
- Customized Design, Fast response to meet customer’s needs
- Experienced Design Team and can offer product at high performance with low cost
- High Efficiency/Low noise Fan. At the same noise level, delivery 30% more air flow
For more information contact designhmi@gmail.com or Click https://www.sojoyusa.com/product/warmtech-car-seat-heater-sj227r017/.
