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首页> 外文期刊>Energy Conversion & Management >An approximate method for prediction of thermal performance of direct expansion-solar assisted heat pump (DX-SAHP) systems for water heating applications
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An approximate method for prediction of thermal performance of direct expansion-solar assisted heat pump (DX-SAHP) systems for water heating applications

机译：用于水加热应用的直接膨胀太阳能辅助热泵（DX-SAHP）系统的热性能预测的近似方法

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摘要

In this study an analytical tbol that combines two models for determination of thermal performance of a direct expansion-solar assisted heat pump (DX-SAHP) domestic hot water heater is presented. The first method-the quadratic model developed in this study-predicts the approximate value of the collector fluid temperature, from the known values of solar radiation in the collector plane (I-coll), condensing temperature and the ambient air temperature. The predicted value of collector fluid temperature is used as an input in a companion model that, using the second law, predicts the system coefficient of performance (COP) from the known values of condensing temperature, compressor efficiency and refrigerant properties. The combined method presented in this study is ideally suited for preliminary design calculations for a selected location or for comparison of different locations for determination of the energy conservation and carbon emission reduction potential of DX-SAHP hot water systems. The thermal performance results predicted from this combined method indicate that system COP ranging from 3.6 to 5.6 can be obtained for the month of January for locations such as New York City, Norfolk and Tampa. The carbon reduction factor (CRF), signifying reduced carbon emission due to switch from electric only water heater to much more efficient DX-SAHP water heater, ranged from 72% to 82% for the chosen locations. This narrow range for CRF indicates that regardless of geographical locations it is prudent to phase out electric only hot water heater and replace them by DX-SAHP water heaters. (C) 2016 Elsevier Ltd. All rights reserved.
机译：在这项研究中，提出了一种分析tbol，该tbol结合了两个模型来确定直接膨胀太阳能辅助热泵（DX-SAHP）家用热水加热器的热性能。第一种方法-本研究中开发的二次模型-根据收集器平面（I-coll）中太阳辐射的已知值，冷凝温度和周围空气温度来预测收集器流体温度的近似值。收集器流体温度的预测值用作伴随模型的输入，该模型使用第二定律，根据冷凝温度，压缩机效率和制冷剂特性的已知值预测系统性能系数（COP）。本研究中提出的组合方法非常适合用于选定位置的初步设计计算或比较不同位置以确定DX-SAHP热水系统的节能和碳减排潜力。通过这种组合方法预测的热性能结果表明，对于纽约，诺福克和坦帕等地区，在一月份可以获得3.6到5.6的系统COP。碳减少因子（CRF），表明从仅电热水器切换到效率更高的DX-SAHP热水器而导致的碳排放减少，对于所选位置，范围从72％到82％。 CRF的范围很窄，这表明无论地理位置如何，都应逐步淘汰仅电热水器，并用DX-SAHP热水器代替。 （C）2016 Elsevier Ltd.保留所有权利。

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