Abstract: A method for installing a maximum power point tracking (MPPT) controller is provided. The method includes acquiring an occlusion area proportion of a photovoltaic string in a photovoltaic system, optimizing the occlusion area proportion to generate a target occlusion area proportion, determining a target position from the photovoltaic string according to the target occlusion area proportion, and installing the MPPT controller at the target position.

Abstract: The invention discloses an ultra-long tunnel sewage disposal, separation and drainage structure suitable for cold regions, comprising: a tunnel portal section drainage structure and a tunnel body section drainage structure and an out-tunnel clear water ditch, an out-tunnel deep-buried ditch, an out-tunnel sewage ditch and a clear water tank; the tunnel portal section drainage structure comprises a central ditch and a side sewage ditch A, the central ditch is deeply buried in the position, lower than the freezing depth, of a tunnel portal section of the main tunnel, and the side sewage ditches A are arranged on both sides of the tunnel portal section of the main tunnel; the tunnel body section drainage structure comprises a side clear water ditch and a side sewage ditch B, and the side clear water ditch and the side sewage ditch B are arranged on both sides of the tunnel body section of the main tunnel.

Abstract: The invention discloses an ultra-long tunnel sewage disposal, separation and drainage structure suitable for cold regions, comprising: a tunnel portal section drainage structure and a tunnel body section drainage structure and an out-tunnel clear water ditch, an out-tunnel deep-buried ditch, an out-tunnel sewage ditch and a clear water tank; the tunnel portal section drainage structure comprises a central ditch and a side sewage ditch A, the central ditch is deeply buried in the position, lower than the freezing depth, of a tunnel portal section of the main tunnel, and the side sewage ditches A are arranged on both sides of the tunnel portal section of the main tunnel; the tunnel body section drainage structure comprises a side clear water ditch and a side sewage ditch B, and the side clear water ditch and the side sewage ditch B are arranged on both sides of the tunnel body section of the main tunnel.

Abstract: A test system and method for thermoelectric module. The test system includes an electrical performance test unit, a heat flux detection unit, and a processor. The electrical performance test unit connects with the thermoelectric module under power generation state to test output power of the thermoelectric module and working current and internal resistance under this output power. The heat flux detection unit includes a heat flux sensor installed at a cold-end of the thermoelectric module to detect the heat flux. The processor electrically connects with the electrical performance test unit and the heat flux detection unit to calculate the thermoelectric conversion efficiency ? of thermoelectric module. By using the technical scheme of the invention, the detection of the thermoelectric conversion efficiency of the thermoelectric module is accomplished.

Abstract: A test system and method for thermoelectric module. The test system includes an electrical performance test unit, a heat flux detection unit, and a processor. The electrical performance test unit connects with the thermoelectric module under power generation state to test output power of the thermoelectric module and working current and internal resistance under this output power. The heat flux detection unit includes a heat flux sensor installed at a cold-end of the thermoelectric module to detect the heat flux. The processor electrically connects with the electrical performance test unit and the heat flux detection unit to calculate the thermoelectric conversion efficiency ? of thermoelectric module. By using the technical scheme of the invention, the detection of the thermoelectric conversion efficiency of the thermoelectric module is accomplished.