At voestalpine Precision AB, a cooling plate rack is placed between hardening and tempering processes. The purpose of the cooling plate rack is to cool the steel to room temperature before entering the tempering process. Currently the plates are cooled using water directly from the nearby river. As the temperature of the water fluctuates over the year, so does the performance of the cooling system. Depending on the thickness and composition of the material, the number of cooling plates is adjusted to enable just the right amount of cooling for the steel to reach room temperature. As of today, the method of selecting the number of plates is purely based on experience and intuition. To solve these problems, the company wants to switch to a closed cooling system and implement a new method to determine how many plates to use.This thesis contains a feasibility study where the relevant theory was documented, and the function of the current cooling system investigated. A requirement’s specification was created for the system, which then led to four concepts for the system's layout and two sub-concepts for controlling the number of cooling plates. After concept elimination, two of these could be selected for further development.The final layout of the system consists of a closed circuit where a cooling medium circulates through the plates and is kept cooled by means of a separate cooling process. The two circuits exchange heat with the help of a plate heat exchanger and the system is kept completely closed by using an air-cooled condenser. The number of cooling plates to be used in different scenarios is determined by monitoring the temperature of the steel before and after each cooling plate. For this, infrared temperature sensors are proposed which are positioned along the frame of the cooling plate rack. Further development is required to complete the proposed cooling system, while temperature monitoring can be implemented today.