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A novel indirect-expansion solar-assisted multifunctional heat pump with four heat exchangers was proposed in this paper, which integrates a heat pump air conditioner, a solar water heater and a heat pump water heater. In addition to these three basic operation modes, it also provided five energy-saving operation modes, which resulted in a higher utilization ratio of the solar energy and lower operational cost. Experiments of the solar-assisted space heating mode, air source heat pump water heating mode and solar-assisted heat pump water heating mode have been investigated in detail at different outdoor temperatures and different water temperatures. The novel indirect-expansion solar-assisted multifunctional heat pump is especially suitable for the regions abundant in solar radiation where the space heating, space cooling and water heating are required all the year round. Practical applications: The novel IX-SAMHP can provide space cooling, space heating, hot water by one system. The space used for those appliances can be reduced effectively. Solar energy was used to assist the space heating and water heating and defrost process and it can save the energy consumption efficiently.

The SHGC coefficient of the double-glazed window with manually controlled movable insulation is the same as optimal SHGC of the doubleglazed window with automatically controlled movable insulation. ControlWindows on different façades are controlled independently. The diagram of the automatic control system is shown in Figure 3. The outdoor and indoor thermometers measure the outdoor and indoor temperatures, respectively. The pyranometer measures the incident solar radiation (both direct and diffuse) on each window. The black bulb temperature sensor measures the mean radiant temperature of the environment

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