Mass Heat Recovery Research Articles

Performance improvement by mass-heat recovery of an innovative adsorption air-conditioner driven by 50–80 °C hot water

The processes of mass recovery and heat recovery in one micro-porous silica gel–water solar adsorption air conditioner were investigated. The influences to MH recovery (mass–heat recovery) performances under different working conditions were studied. The result shows when the hot water temperature is lower, longer mass recovery time is needed for the re-adsorption of the cold adsorbent bed and re-desorption of the hot adsorbent bed. Meanwhile, the process of heat recovery can recover heat to improve Coefficient of Performance (COP) of the system. When the hot water inlet temperature (Th,i), cooling water inlet temperature (Tc,i) and chilled water outlet temperature (Tch,o) are about 55 °C, 26 °C, 16 °C, the COP is 0.31 in the cycle with 180 s of mass recovery while the COP is 0.27 in the cycle with 90 s of mass recovery. When the Th,i, Tc,i and Tch,o are 80 °C, 30 °C and 15 °C, the cooling capacity and COP are 15.3 kW and 0.5 in the cycle without heat recovery, while in the cycle with 30 s of heat recovery, the cooling capacity, COP and specific volumetric power can arrive 15.8 kW, 0.53 and 20.6 kW m−3.

Experimental analysis of an adsorption air conditioning with micro-porous silica gel–water

In this paper, one novel heat pipe solar adsorption chiller with mass-heat recovery was designed. 65 kg of micro-porous silica gel was used as adsorbent in each adsorbent bed. The influence of operating conditions on the chiller was investigated. The chiller was applied in Green Building in Dezhou city (north latitude of 36°41′) in China. Under the typical summer weather conditions, the average thermal efficiency of solar collector, the average COP (coefficient of performance) of the adsorption refrigerator and the average solar COP of the system are 0.36, 0.44 and 0.16, respectively. The results show that the adsorption cooling performance rises as the hot water inlet temperature, chilled water outlet temperature rise, and it declines as the cooling water inlet temperature rises. The performance can be improved by mass-heat recovery significantly. When the hot water inlet temperature, cooling water inlet temperature, chilled water outlet temperature are 79.0 °C, 25.4 °C, 13.7 °C, respectively, the cooling capacity and COP are 17.9 kW and 0.63, respectively.

Experimental analysis of an adsorption refrigerator with mass and heat-pipe heat recovery process

A heat pipe type adsorption refrigerator system is proposed and investigated, which can be powered by solar energy or waste heat of engine. The study assesses the performance of compound adsorbent (CaCl 2 and activated carbon)–ammonia adsorption refrigeration cycle with different orifice sets and different mass and heat recovery processes by experimental prototype machine. Specific cooling power (SCP) and coefficient of performance (COP) were calculated with experimental data to analyze the influences of operating condition. The results show that the jaw opening of the hand needle nozzle can influence the adsorption performance obviously and the thermostatic expansion valve (TEV) is effective in the intermediate cycle time in the adsorption refrigeration system. The SCP of the cycle with the mass-heat recovery together (combined recovery process) is superior to that of the conventional cycles with mass recovery or heat recovery independently.

Dynamic characteristics of a novel adsorption refrigerator with compound mass-heat recovery

SUMMARY A three-effect heat pipe (heat pipe heating, heat pipe cooling and heat pipe heat recovery) adsorption refrigeration system using compound adsorbent (calcium chloride and activated carbon) was designed. The dynamic characteristics of mass and heat pipe heat recovery were studied. The results show that mass recovery and heat pipe heat recovery can improve (specific cooling power) SCP and (coefficient of performance) COP greatly. The averaged SCP of the cycle with mass recovery and the cycle without mass recovery is 502.9 W/kg and 436.7 W/kg at about 30 °C of cooling water temperature and −15 °C of evaporating temperature. The corresponding COP is 0.27 and 0.24 respectively. Copyright © 2011 John Wiley & Sons, Ltd.

China: Dezhou Hongqiao — aniline

In this paper, one novel heat pipe solar adsorption chiller with mass-heat recovery was designed. 65 kg of micro-porous silica gel was used as adsorbent in each adsorbent bed. The influence of operating conditions on the chiller was investigated. The chiller was applied in Green Building in Dezhou city (north latitude of 36°41′) in China. Under the typical summer weather conditions, the average thermal efficiency of solar collector, the average COP (coefficient of performance) of the adsorption refrigerator and the average solar COP of the system are 0.36, 0.44 and 0.16, respectively. The results show that the adsorption cooling performance rises as the hot water inlet temperature, chilled water outlet temperature rise, and it declines as the cooling water inlet temperature rises. The performance can be improved by mass-heat recovery significantly. When the hot water inlet temperature, cooling water inlet temperature, chilled water outlet temperature are 79.0 °C, 25.4 °C, 13.7 °C, respectively, the cooling capacity and COP are 17.9 kW and 0.63, respectively.