The invention relates to a multi-zone air conditioning system for vehicles (1) with several air conditioning zones (2), in particular for buses, characterized thereby that an air temperature control unit (3) is implemented to generate simultaneously warm air and cold air, wherein the cold air across a cold air duct (5) and the warm air across a warm air duct (6) extend separated from one another as a double conduit over the length of the vehicle (1) and that decentralized air mixing units (4) with at least one air outlet (20) are disposed along the double conduit and that the air outlets (20) are assigned to the air conditioning zones (2) of the vehicle (1).

A heating arrangement may include at least one PTC heating device with at least one first PTC heating element. The PTC heating device includes at least one second PTC heating element that is distinct from the first PTC heating element, wherein the first and second PTC heating elements may be arranged in a through-flow direction next to one another. Alternatively, a further PTC heating device with at least one second PTC heating element that is distinct from the first PTC heating element may be provided, wherein the first and second PTC heating devices may be arranged in the through-flow direction next to one another.

A heating arrangement may include a first PTC heating device with at least one first PTC heating element, and a second PTC heating device with at least one second PTC heating element. The first and second PTC heating devices may be arranged in a through-flow direction one behind the other. The first and second PTC heating devices may be controllable independently of one another via a controller.

A heat generator using a Carbon Nano Tube (CNT) composite material includes: an outer electrode part; an inner electrode part which faces the outer electrode part and is spaced apart from the outer electrode part at a predetermined distance; a connection part which connects the outer electrode part with the inner electrode part; and a bracket part which is disposed in the outer electrode part and the inner electrode part including the connection part to shield the outer electrode part, the inner electrode part and the connection part from each other. A surface of the connection part does not face directly the outer electrode part and the inner electrode part. The outer electrode part and the inner electrode part include electrodes having polarities different from each other.

An electric heating device having a multiplicity of electric heating elements, wherein the respective electric heating element has a first electric contact element and a second electric contact element and at least one heater, wherein the first and second electric contact elements achieve electrical contacting of the at least one electric heater, additionally having a first voltage connection element and a second voltage connection element, additionally having first switching elements and having second switching elements, wherein pairs of two electric heating elements are each wired such that two first electric contact elements in each case of the two electric heating elements can be switchably connected to the first voltage connection element by one of the first switching elements and one of the second contact elements in each case of the pairs can be switchably connected to the second voltage connection element by means of a second switching element.

An air-conditioning system for air-conditioning a vehicle interior is disclosed. The air-conditioning system includes a blower for generating an air flow, a heating device for heating the air flow, and a ducting system that divides the air flow downstream of the heating device over at least two part air flows and supplies the at least two part air flows via associated ducts to associated air outlets, through which the part air flows exit into the vehicle interior. The heating device includes at least two separate regions each with at least one electric heating element that is separately controllable via a control device. The at least two separate regions are each permanently assigned one of the associated ducts of the ducting system.

A temperature control method, including periodically sensing an air temperature of a space, and periodically sensing a surface temperature of each of a plurality of interior surfaces; in response to the air temperature and the surface temperatures being less than a target temperature, calculating an air heating duration of an air conditioner and a surface heating duration of each of a plurality of heater devices arranged in an array according to the target temperature, the air temperature and the surface temperatures; performing an air heating operation according to the air heating duration and performing surface heating operations according to the surface heating durations; and in response to the air temperature currently sensed and the surface temperatures currently sensed reaching the target temperature, instructing the air conditioner to stop performing the air heating operation.

An electrical fluid heater, in particular water heater, preferably for a motor vehicle, including at least one fluid accommodating container and at least one heating conductor having a conductive polymer structure, for heating fluid, in particular water, accommodated in the fluid accommodating container.

The invention relates to a surface temperature-controlling device, in particular for use in vehicles, comprising a first air-distributing layer which has multiple air inlets extending through the first air-distributing layer and multiple air outlets extending through the first air-distributing layer, and a second air-distributing layer which fluidically connects air inlets and air outlets of the first air-distributing layer, wherein the air inlets are designed to introduce pre-heated or pre-cooled air into the second air-distributing layer, and the air outlets are designed to discharge air out of the second air-distributing layer.

A cabin heater for a vehicle includes a frame with spaced apart longitudinal supports to locate a common electrical return and a power input. Pluralities of heating units extend between the supports and attach to the return and input. Each unit has a ceramic heater and one or more positive temperature coefficient (PTC) elements. The ceramic heater quickly and directly heats air and helps lower the inrush current of each PTC element upon initial powering. The power input also includes conductive rails spaced apart and electrically isolated from one another to individually supply power to either the ceramic heater or the PTC elements, but not both. Conductive extensions pass through the rails and fold into contact to power either the heater or the PTC elements. The electrical return commonly attaches the PTC elements and the heater, including a spring connection.