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 . <EOS>