Simulation analysis for controlling temperature stability of a radiant-board system served for thermodynamic temperature measurement laboratory

Fundamental metrology is closely tied to scientific advancement and requires well-equipped facilities to achieve low measurement uncertainty in rigorous experiments. Addressing the ±0.1 K high-stability temperature control issue of the precision laboratory radiant air conditioning system, this study investigated the influence of different radiant panel area ratios, laying methods, cold source water supply temperature fluctuations, and external environmental disturbances by simulations. The results indicate that: (1) the larger the ratio of radiant panel area, the greater the fluctuation in equipment surface temperature; (2) the surface temperature of the measurement equipment can satisfy ±0.1 K control temperature stability requirement when the fluctuations of the surface temperature of radiant panels and glass window are within ±0.5 K and ±1 K respectively without radiant panels on the ceiling; (3) the surface temperature of the measurement equipment can satisfy ±0.1 K control temperature stability requirement when the fluctuations of the surface temperature of radiant panels and glass window are within ±0.2 K and ±2 K respectively with radiant panels on the ceiling. This study provides a reference for the design and operation control of air conditioning systems in fundamental metrology.