Aerospace galley insert comprising oven

An aerospace galley insert comprising:

• an oven defining therein an oven inner cavity for receiving food to be prepared;
• a fluid supply for supplying fluid comprising water or water vapour to the oven inner cavity;
• an exterior space defined outside of the oven inner cavity;
• a heat pipe extending between the oven inner cavity and the exterior space, the heat pipe including a wick surrounding a vapour cavity, a casing and a working liquid, wherein the heat pipe is configured such that working liquid in the wick evaporates into the vapour cavity when a first end of the heat pipe is exposed to heat, migrate towards a second end of the heat pipe and condense back to a liquid;
• a first temperature sensor located in the inner cavity and separate from the heat pipe for detecting a first temperature in the oven inner cavity;
• a second temperature sensor located in the exterior space and separate from the heat pipe for detecting a second temperature in the exterior space;
• a third temperature sensor on the heat pipe for detecting a third temperature of the heat pipe where it extends into the exterior space;
• and
• a control unit configured to determine an actual water vapour concentration in the oven inner cavity based on the first, second and third temperatures, and configured to control the fluid supply in order to adjust the actual water vapour concentration to a target water vapour concentration.