Temperature control apparatus for controlling the temperature of biomass contained in a receptacle, comprising - at least one temperature control means, and - at least one conveying device for conveying a mass flow of biomass along a main flow direction, -- wherein the at least one conveying device has at least one stirrer, and -- wherein the at least one temperature control means is arranged in the main flow direction generated by the at least one conveying device, and the at least one temperature control means is tubular having an inner tube and an outer tube which is arranged coaxially with respect to the inner tube, - wherein the inner tube and the outer tube form an intermediate space through which a temperature control medium can flow, and - wherein the at least one temperature control means is orientated in such a manner with respect to the at least one conveying device that at least 40% of the conveyed volume of the mass flow generated by the at least one conveying device flows through the inner tube, characterised in that - the at least one temperature control means is arranged downstream of the at least one conveying device and is orientated in such a manner that the longitudinal axis of the at least one temperature control means corresponds to a rotation axis of the at least one stirrer, and - in that a diameter of an envelope of the at least one conveying device is located in a range between 100 and 140% of the inner diameter of the inner tube of the at least one temperature control means. - at least one temperature control means, and - at least one conveying device for conveying a mass flow of biomass along a main flow direction, -- wherein the at least one conveying device has at least one stirrer, and -- wherein the at least one temperature control means is arranged in the main flow direction generated by the at least one conveying device, and the at least one temperature control means is tubular having an inner tube and an outer tube which is arranged coaxially with respect to the inner tube, -- wherein the at least one conveying device has at least one stirrer, and -- wherein the at least one temperature control means is arranged in the main flow direction generated by the at least one conveying device, and the at least one temperature control means is tubular having an inner tube and an outer tube which is arranged coaxially with respect to the inner tube, - wherein the inner tube and the outer tube form an intermediate space through which a temperature control medium can flow, and - wherein the at least one temperature control means is orientated in such a manner with respect to the at least one conveying device that at least 40% of the conveyed volume of the mass flow generated by the at least one conveying device flows through the inner tube, characterised in that - the at least one temperature control means is arranged downstream of the at least one conveying device and is orientated in such a manner that the longitudinal axis of the at least one temperature control means corresponds to a rotation axis of the at least one stirrer, and - in that a diameter of an envelope of the at least one conveying device is located in a range between 100 and 140% of the inner diameter of the inner tube of the at least one temperature control means.