Multi-Objective Comparative Analysis of Various Ventilation–Radiant Coupled Heating Systems

This paper conducts a multi-objective comparative study on various ventilation–radiant coupled heating systems that combine mixing ventilation (MV) and displacement ventilation (DV) with ceiling, side wall, and floor radiant heating. The aim is to explore the differences in indoor environmental quality (IEQ) and human thermal comfort under different system configurations, as well as the impact of the radiant temperature in the radiant modules and the supply air temperature in the ventilation module on system performance. The research results show that the combination of displacement ventilation and floor radiant heating (DV-F) performs the best in terms of thermal comfort and energy efficiency. In this configuration, the Predicted Mean Vote (PMV) for the indoor environment and human thermal comfort is close to neutral (−0.15 to 0.35), the Draught Rate (DR) is significantly lower than in other systems (3.7% to 4.4%), and the ventilation efficiency is relatively high. In addition, a comprehensive evaluation of different system configurations using the CRITIC weight method further verified that the DV-F configuration with a radiant temperature of 26.2 °C to 28.2 °C and a supply air temperature of 26 °C to 28 °C is superior. This study provides theoretical guidance for the design and optimization of heating systems.