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Thermal performance study of box type solar cooker from heating characteristic curves

机译：从加热特性曲线研究箱式太阳能灶的热性能

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摘要

The top heat losses that constitute the major losses from the box type solar cooker have a strong influence on the thermal performance. To predict or evaluate the thermal performance of a cooker, the top heat loss coefficient U_(tw) for a water loaded cooker must be known. In the present study, several indoor and outdoor experiments were performed on a solar cooker to develop a correlation for the variable U_(tw) as a function of pot water temperature, wind speed and ambient air temperature. The proposed correlation for U_(tw) is employed to obtain heating characteristic curves or predict the thermal behaviour of the cooker for different quantities of water, solar radiation levels and wind speeds. The investigations reveal that the pot water requires less time to reach a certain temperature with an increase in solar radiation level, while it takes a longer time with higher values of load of water in the pots, as expected. However, the effect of wind speed on the time required for certain rise in pot water temperature is marginal.
机译：构成箱式太阳能灶具主要损失的最大热量损失对热性能有很大影响。为了预测或评估炊具的热性能，必须知道装有水的炊具的最大热损失系数U_（tw）。在本研究中，在太阳能炊具上进行了一些室内和室外实验，以求出变量U_（tw）与饮用水温度，风速和周围空气温度之间的关系。针对不同的水量，太阳辐射水平和风速，建议的U_（tw）相关性用于获得加热特性曲线或预测炊具的热性能。研究表明，随着太阳辐射水平的提高，自来水需要较少的时间达到一定温度，而如预期的那样，在水的负荷较高时花费的时间更长。但是，风速对饮用水温度一定升高所需时间的影响很小。

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