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              <p>&lt;div&gt;&lt;p&gt;This paper presents a novel thermodynamic system developed to generate heat and cold for industrial processes in a more efficient way than traditional ones. The proposed hydro-CO2 piston combines three counter-intuitive innovations with the operation of discontinuous and slowed thermodynamic cycles where mechanical work is transferred to the refrigerant through a hydraulic circuit based on modified transcritical Carnot/Rankine cycles. This allows to operate the cycle under unusual thermodynamic transformations such as isothermal compression and multiphasic expansion. Thermodynamic cycles are tailored to the demand and irreversibilities are minimized to make cold/heat generation/valorization highly efficient and cost effective. This study focuses on the thermal performance of the technology for commercial negative (-20 °C) and positive (0 °C) cold generation. Based on numerical analysis and validated models using different numerical tools (EES, Python) and databases (CoolProp, REFPROP), the simulation results compare traditional frigorific units to the hydro-CO2 piston in the two different case studies. The results show an increase of thermal production between 90 to 260% for the same duty and demonstrate the energy efficiency and the potential of environmental impact reduction of the proposed technology.&lt;/p&gt;&lt;/div&gt;</p>
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