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Solar Load Ratio and ISO 13790 methodologies: Indirect gains from sunspaces

机译：太阳负载比和ISO 13790方法论：太阳空间的间接收益

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摘要

This paper reviews and analyzes the compatibility of the simplified empirical method based on the dimen-sionless parameter of Solar Load Ratio (SLR) and the monthly procedure of the standard ISO 13790 for indirect gains, specifically for unconditioned zones adjacent to a conditioned zone, but separated from it by a partition wall (sunspaces). The main contribution of the work presented here is the new formulation to account SLR correlations in ISO 13790, obtained for sunspaces, but generalizable for other solar systems with known SLR functions. Simulation models are used to perform a sensitivity analysis of internal gains and heat transfer through solar collector surfaces, both issues that distinguishes ISO 13790 from Load Ratio methods. The analysis shows that internal gains can be added to the heat source term or subtracted to heat transfer term without influencing the utilization factor dependence with the gain-to-loss ratio. On the other hand, the SLR assumption that solar collector surfaces are neutral elements and, therefore, not added to the heat transfer term, results in large inconsistencies between SLR and ISO 13790 methods. The detailed monthly methodology of ISO 13790 fairly reproduces results obtained by simulation. However, predictions from the simplified monthly methodology of ISO 13790 fail in mid season months and coldest months.
机译：本文回顾并分析了基于太阳负荷比（SLR）的无量纲参数和标准ISO 13790每月收益间接收益的简化经验方法的兼容性，特别是对于与条件区域相邻的非条件区域，但是通过隔墙与之隔开。此处介绍的工作的主要贡献是考虑了ISO 13790中的单反相关性的新公式，该相关性是从太阳空间获得的，但可以推广到具有已知SLR功能的其他太阳系。仿真模型用于对内部增益和通过太阳能集热器表面的热传递进行灵敏度分析，这两个问题都将ISO 13790与负载率方法区分开来。分析表明，可以将内部增益添加到热源项或减去热传递项，而不会影响损益比对利用率的依赖性。另一方面，SLR假设集热器表面是中性元素，因此未添加到传热项中，这导致SLR与ISO 13790方法之间存在很大的不一致。 ISO 13790的每月详细方法公平地再现了通过仿真获得的结果。但是，根据ISO 13790的简化月度方法进行的预测在季节中期和最冷的月份失败。

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