To investigate the effects of the heat preservation measures adopted on the indoor air temperature of Chinese solar greenhouse (CSG) in this study, three testing cases, attaching a tunnel to CSG, covering the attached tunnel with an insulation blanket and strengthening insulation on the CSG wall with its south roof covered with a thermal blanket, were conducted for one testing CSG and one reference CSG. This study focuses on the comparison of morning and night temperatures. The results showed that: Under low outside air temperature, the average air temperature difference between the CSG with an attached tunnel and the reference CSG in the morning and night is generally within 0.5 ℃; When the external temperature is high, it is usually 1.0~4.0 ℃. The results also indicate that the indoor air temperature increment is not obvious for a CSG with a layer of blanket covering the attached tunnel than that in the reference CSG, with the maximum temperature difference of 1.0 ℃ presented in the morning and night in January. Compared with a reference CSG with the same attached tunnel, a CSG with strengthening insulation on the wall and thermal blanket has an average maximum difference of 4.2 ℃ in the morning and at night in January with the low external temperature; The average maximum difference is 6.5 ℃ in February with high external temperature. The findings in this study provide references for the design, construction, selection of insulation measures and CSG ventilation management.
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