Due to the thermal storability of solar salt, used in solar tower power plants, efforts have been made to develop new receiver geometries and to improve the overall performance of such power plants. There are two main configurations of molten salt receivers for solar towers. The first one, called external receiver, utilizes the outer shell as absorptive area, whereas the cavity receiver collects the energy of the sunlight, entering through a circular aperture on the inside. This thesis discusses the design and the simulation of a solar salt cavity receiver with a new pentagonal layout. The main aim was to examine the dynamic thermal behavior of the receiver and especially the molten salt. Therefore, the behavior of the mass fluxes, the temperatures in the pipe-walls and of the salt and the pressures over time was investigated for given solar radiation input, wind speed and ambient temperature. For the simulation of the operation a "hot-start" sequence, several "shutdown" sequences and a "whole-day" sequence were implemented using the dynamic Process Simulation Software Apros. Furthermore a heat loss calculation for the receiver and an evaluation of the thermal stresses of the receiver-pipes were performed.