Passenger compartment heating system, in particular bus heating system

Claim 1

A passenger compartment heating system having a heat-emitting part with a plurality of heaters which are arranged in series on a heat emission side of a closed heating circuit, comprising a heat transfer medium flowing through the closed heating circuit unidirectionally; a heat-absorbing part with at least one heat exchanger means to serve as a heat source; and a buffer tank of variable volume for controlled removal or replenishment of the heat transfer mechanism connected on a liquid side of the passenger compartment heating system; wherein the heat exchanger has a primary side adjacent a heat generating means; the heat transfer medium enters the heat-emitting part with a particular inlet temperature; the particular inlet temperature and the heat transfer medium are matched to one another such that a two-phase mixture of liquid and vapor of the heat transfer medium in a saturation vapor state is present in the heat-emitting part; the heat exchanger means is operated as vaporizer and has at least one of a porous wall and a capillary block that separates a liquid-only side and vapor side of the passenger compartment heating system from one another; the at least one of the porous wall and capillary block has capillary-active channels within the closed heating circuit; and the heat generating means on the primary side is fed with liquid through the at least one of the porous wall and the capillary block and is located on the vapor side of the latter.