Study On The Thermal Process And The Design Optimization Of Intermittent Heating Solar Building

The object of this paper is to give full play to the adjustment function of the passivesolar houses, reduce operation time and load of the intermittent heating system, realize the maximization of energy saving. According to the key technical problems of the coupling regulation between passive solar energy and floor radiantion intermittent heating, this paper study the following contents used by theoretical analysis, numerical simulation and field test method: Master the influence relation of the heat preservation and heatinertia parameters on the heat transfer of palisade structure; Based on the study of heatgain of passive solar components, to realize the heat gain maximization of passive solarenergy, the operation management of collection hot parts and the component designoptimization method are obtained; The storage and release heat rules of the floor radiantintermittent heating and the effect of floor operation and design parameters on this laware obtained; Based on the dynamic load characteristics of passive solar houses, thematching exothermic storage characteristics of intermittent heating floor and theoperation control strategy of the intermittent heating system are obtained; Based on theabove mentioned problems, the research results as follows:Firstly, the unsteady heat transfer process of building enclosure is analyzed underthe influence of both the external and internal thermal disturbances used bymathematical method. The analysis solution of temperature and heat flux densitydistribution of palisade structure is obtained, and the analysis solution is benefit toanalyze the influence relationship of heat preservation and structure inertia parameterson heat transfer. Also, the experiment results attested the calculation result, which showed that this solution was accurate, practical and more accessible.Secondly, this article analyzed the peculiarity of the heat collection components, inwhich the flow and heat transfer model of the window and the curtain influenceddirectly by the solar radiation was established. By the thermal network analysis method,the additional thermal resistance factor of the curtain and its recommended installingposition was got. At the same time, by the locale test research to the demonstrationproject, the way for getting the best open and close time of ventilation holes on the heatstorage and release wall was confirmed. Also, the analysis to the heat flow and transfermodel of this wall can help get the heat storage and release law of these ventilationholes. The result showed that these holes should be open2hours after the sunrise, whilethey should be closed1hour before the sunset. Also, the result illustrated that influencefrom the heat storage and release law from the opening and the closing of the ventilatingholes was weak; the heat storage value of the wall could get to the maximum at16:00,while the minimum at7:00to8:00.Thirdly, established mathematical physics models of radiation heating floorrespectively in operation、break and preheat period. The discipline of the floor surfaceheat dissipating capacity, the discipline of floor heat storage and release and the impactof coil running water temperature and filled layer thickness and coil spacing were got bynumerical calculation and test method of validation. The results showed that: when theradiant floor heating run continuously, the coil running water temperature influenced thefloor surface temperature and heat-flow density most, filled layer thickness had lessinfluence and the influence of coil spacing was between them. When coil spacing for100mm,200mm and300mm, the time from full release heating to stable state wereabout2.5h,5h and7.5h, therefore, coil spacing had a big influence on preheating. Thediscipline of floor heat storage and release in operation、 break and preheat period wasalso got through theoretical analysis and numerical calculation. The actual measurementdata compared with numerical calculation results showed that the error was less than7%when the lower surface of floor board was considered as a thermal isolation surfaceand compared to the actual measurement data, the mean error was6.6%, the maximumerror was just6.9%, the numerical calculation was considered reliable.Forthly, based on the dynamic load characteristics of passive solar houses, the exothermic storage characteristics of intermittent heating floor is studied and the floorstructure performance parameter and intermittent operation mode are obtained.Finally, the change rules of room heat load and thermal environment are obtainedby studing dynamic heat transfer process and exothermic storage properties of palisadestructure under the regulation by coupled thermal process between solar architectureand intermittent heating. The results showed that: the room temperature under theregulation by coupled thermal process between solar architecture and intermittentheating was18℃or so, and fluctuations in2-3℃, completely satisfied human thermalcomfort requirements. The energy saving rate of several kinds of load law mentioned inthis paper were as high as50%,67%, and83%, by using coupled regulation. It meantthis coupled heating way had a high energy conservation effect.In conclusion, the heating regulation method of solar buildings coupled withintermittent heating save heating energy and avoid the indoor overheat caused bycontinuous heating greatly. The results will provide based data and theoretical supportfor heating design of solar buildings and revision of related standard for building energysaving.