OPERATING CHARACTERISTICS OF ADSORPTIVE REGENERATOR OF LOW-POTENTIAL HEAT AND MOISTURE BASED ON COMPOSITE SORBENTS ‘SILICA GEL – SODIUM SULPHATE’ AND ‘SILICA GEL – SODIUM ACETATE’ SYNTHESIZED BY SOL – GEL METHOD

Abstract

The operating characteristics adsorptive regenerator of low-potential heat and moisture based on composite sorbents ‘silica gel – sodium sulphate’ and ‘silica gel – sodium acetate’ synthesized by sol – gel method are studied. Sorption heat regenerator operating and environmental test results are shown. Flows switch-over time is observed to depend on airflow rate and temperature differential between warm and cold ends of regenerator in steady-state conditions. Time dependences of absolute and relative humidity on the warm and cold regenerator ends are shown to be of periodic nature when both of sorbent used. Time dependences of temperature are observed to be periodic nature on warm and cold ends of regenerator and between holders with sorbent. Amplitude of time dependences of absolute and relative humidity and temperature for ‘silica gel – sodium acetate’ are stated to be less than observed when composite ‘silica gel – sodium sulphate’ used. Correspondence of temperature and humidity time dependences and sorbent sorption capacity is shown. Correlation between heat-regeneration-coefficient-dimensionless temperature differential and moisture-regeneration coefficients-dimensionless humidity differential dependences is approximated with fair accuracy for engineering calculation by linear polynomials of degree 2. Similarity of polynomials described both of dependences is shown to result from close interrelation between heat and mass transfer processes. These coefficients are shown to be capable of task-oriented variation in sufficient wide ranges by changing of half-cycle time, sorbent granules sizes and its amount. The investigation results can be used for development energy-efficient ventilation systems for residential and storage premises.