Abstract: The present invention relates to an air curtain comprising a longitudinally extending frame comprising a longitudinally extending air inlet opening; and a longitudinally extending air outlet. According to the invention there is a row of electrical fans between the longitudinally extending air outlet and the longitudinally extending air inlet opening for introducing air into the air curtain and expelling it through the longitudinally extending, downward facing air outlet for generating an air-curtain. The invention also relates to a vehicle provided with such an air curtain.

Abstract: A method of maintaining a space in a means of transport, such as a vehicle, at a desired temperature. The vehicle is provided with a storage tank containing a medium having a suitable temperature. According to the invention the storage tank is part of the transport means, the storage tank possesses an inlet opening for increasing the capacity for maintaining the space at the desired temperature, and is thus achieved; i) by feeding through the inlet opening a regenerating medium-comprising liquid and, after heat exchange between the regenerating medium and the medium, discharging the regenerating medium-comprising liquid; or ii) by via the inlet opening replacing the medium in the storage tank comprising liquid with medium-comprising liquid having a greater capacity of maintaining the space at the desired temperature.

Abstract: Market garden greenhouse system in which plant products can be cultivated, which market garden greenhouse is substantially not provided with ventilating openings, wherein the market garden greenhouse comprises: heat regulating means for regulating the beat in the greenhouse, which heat originates substantially from the solar energy which comes into contact with the market garden greenhouse; and/or a heating system, and/or air humidity regulating means for regulating the air humidity in the greenhouse.