Abstract
A physical model and dynamic simulation models of a solar phase-change heat storage heating system with a plate solar collector, phase-change material (PCM) storage tank, plate heat exchanger, and auxiliary heat sources were established. A control strategy and numerical models for each of seven different operation modes that cover the entire heating season of the system were developed for the first time. The seven proposed operation modes are Mode 1: free cooling; Mode 2: reservation of heat absorbed by the solar collector in the PCM storage tank when there is no heating demand; Mode 3: direct supply of the heating demand by the solar collector; Mode 4: use of the heat absorbed by the solar collector to meet the heating demands, with the excess heat stored in the PCM storage tank; Mode 5: use of heat stored in the PCM storage tank to meet the heating demands, Mode 6: combined use of heat stored in the PCM storage tank and the auxiliary heating sources to meet the heating demands; and Mode 7: exclusive use of the auxiliary heat sources in order to meet the heating demands. Mathematical models were established for each of the above seven operation modes, taking into consideration the effects of the outdoor meteorological parameters and terminal load on the heating system. The real-time parameters for the entire heating season of the system with respect to the different operation modes can be obtained by solving the simulation models, and used as reference for the optimal design and operation of the actual system.
Highlights
Solar energy is a clean, renewable, and safe energy, and is very relevant in the modern society, amidst issues of energy shortage and environmental pollution
A control strategy and system with flat-plate solar collectors, a water tank with a plate phase-change heat storage unit, a plate numerical models for each of seven different operation modes that cover the entire heating season of heat exchanger, and auxiliary heat sources, in consideration of the entire heating cycle and operation the system were developed for the first time
The seven proposed operation modes are Mode 1: free cooling; Mode 2: reservation of heat models for each of seven different operation modes that cover the entire heating season of the system absorbed by the solar collector in the phase-change material (PCM) storage tank when there is no heating demand; Mode 3: were developed for the first time
Summary
Solar energy is a clean, renewable, and safe energy, and is very relevant in the modern society, amidst issues of energy shortage and environmental pollution. A hot water thermal energy storage system and two latent-heat TES systems with PCM plate heat exchangers were considered, and their performances under dynamic conditions were analyzed and compared. Kanimozhi et al [30] used models and transfer rate,to greater accumulated energy, a lower number of storagea units required to meet the experiments analyze the performance ofand a TES system, and developed method for enhancing heating demand. A dynamic simulationa model of a solar system with a heat hybrid heat source plate heat of exchanger, and auxiliary sources, in consideration of the entire heatingunit, cycle and composed flat-plate solar collectors,heat a water tank with a plate phase-change heat storage a plate operation in different heating mode, wasinfirstly established. Simulation models, and used as reference for the optimal design and operation of the actual system
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