Abstract
The application of attached sunspace passive solar heating systems (ASPSHS) for farmhouses can improve building performance, reduce heating energy consumption and carbon dioxide emissions. In order to take better use of the attached sunspace to prevent heat transfer or promote natural ventilation, this paper presented a zero-state response control strategy for the opening and closing time of active interior window in the ASPSHS. In order to verify the application of this strategy, an attached sunspace was built in an actual farmhouse. A natural ventilation heat exchange model was built based on the farmhouse with attached sunspace. The proposed zero-state response control strategy was implemented in TRNSYS software. Field measurement in living lab was carried out to inspect the distribution of the thermal environment in the farmhouse with attached sunspace under a zero-state response control strategy in the cold region of northern China. The experimental results show that, even under −5.0–2.5 °C ambient temperature, the application of zero-state response control strategy effectively increases the internal temperature to an average of 25.45 °C higher than the outside, with 23% indoor discernible temperature differential in the sample daytime. The whole-season heating performance was evaluated by simulating the model for the heating season in 2020–2021. The simulation demonstrates that the ASPSHS under zero-state response control strategy can maintain a basic indoor temperature of 14 °C for 1094 h during the heating season, with a daytime heating guarantee rate of 73.33%, thus ensuring higher indoor heating comfort during the day. When compared to a farmhouse with an attached sunspace under the zero-state response control strategy, the energy savings rate can be enhanced by 20.88%, and carbon emissions can be reduced by 51.73%. Overall, the attached sunspace with the zero-state response control strategy can effectively increase the indoor temperature when the solar radiation is intensive and create a suitable thermal environment for the farmhouse in the cold region of northern China.
Highlights
The results demonstrate the benefit of using an attached sunspace to reduce heating energy consumption in farmhouses in China’s cold regions; Ma et al [14] used EnergyPlus software to model the glass unit of the attached sunspace in a farmhouse in northeast China
In order to obtain more efficiency in the control strategy of the interior active window, the attached sunspace and indoor natural ventilation heat exchange were modeled by TRNSYS, which was validated in the living lab experiment
The attached sunspace is used as a heat collection component, which increases the internal air temperature by absorbing solar radiation, and stores part of the heat in the envelope structure
Summary
The utilization of passive solar energy and energy-saving design solutions in cold climates can greatly cut winter heating energy use [3]. The climate in northern China is chilly, and residents have a strong desire to improve their temperature in their homes. The favorable sunshine conditions in the countryside along with rural houses being mostly low-rise buildings with low density make it suitable for the development of passive solar heating technology [4]. A suitable construction of passive solar heating systems (PSHS) for new constructions or reconstructions of existing farmhouse buildings in northern China has tremendous energy-saving renovation potential for reducing energy consumption in winter heating [5]
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