In order to meet the demand of stable and continuous household electricity con?sumption, the author proposes the modelling and simulation of photovoltaic fuel cell hybrid power generation system. The system is composed of photovoltaic power generation device, fuel cell/super capacitor, electrolytic cell, hydrogen storage device and power regulation unit. As photovoltaic power generation is affected by sunshine changes, the combination of fuel cells and super capacitors with photo?voltaic devices can ensure the stability and reliability of power supply of hybrid power generation system. Taking sunshine intensity and household electricity consumption in a certain area as an example, the system is simulated in MATLAB/SIM?ULINK software. The results show that: At 08:30-17:00, the output power of the fuel cell is almost zero. This is because the electric energy output by the photovoltaic power generation system can basically meet the power demand of users during this period. At 00:00-6:00 and 18:30-24:00, the sunlight intensity is zero, and the power output of the photovoltaic power generation system is zero, at this time, the user?s electricity is completely supplied by the fuel cell. The investment cost of 1 kW fuel cell is about 45258.4 yuan, and that of 1 kW ordinary battery is about 15200 yuan, the investment cost of fuel cell is still high. In conclusion, the hybrid power generation system can meet the demand of ordinary household electricity.

This article presents a new on-line dimethyl ether/diesel mixing method, researches its blend characteristics, and also validates combustion and emission effects on a light-duty direct injection engine. This new blend concept is that dimethyl ether is injected into the fuel pipeline to mix with local diesel as the injector stops injection, and this mixing method has some advantages, such as utilization of the original fuel system to mix dimethyl ether with diesel intensively, flexibility on adjustable mixing ratio varying with the engine operating condition, and so on. A device was designed to separate dimethyl ether from the blends, and its mixing ratios and injection quantity per cycle were also measured on a fuel pump bench. The results show that compared with the injected diesel, the percentages of dimethyl ether injected into fuel pipeline are 13.04, 9.74, 8.55, and 7.82% by mass as the fuel pump speeds increase, while dimethyl ether injected into fuel pipeline are 45.46, 35.53, 31.45, and 28.29% of wasting dimethyl ether. The power outputs of engine fueled with the blends are slight higher than those of neat diesel at low speeds, while at high speeds, its power outputs are a little lower. Smoke emissions of the blends are lower about 30% than that of neat diesel fuel at medium and high loads with hardly any penalty on smoke and NOx emissions at light loads. The NOx and HC emissions of the blends are slight lower than that of neat diesel fuel at all loads.

Dimethyl ether (DME) is a promising and excellent alternative fuel for compression ignition DI diesel engines. In addition to the significant merit of no soot emission, DME would be of better ignition quality, lower auto ignition temperature and better atomization compared with diesel. The paper presents models and simulates fuel injection system of diesel/DME engine. Simulation calculation proven that DME could injected into mixed cavity propitious and mixed rather equality with diesel. Injecting characteristic of fuel system was impacted by blended DME, and the incidence came along with DME proportional.

In order to solve the shortcomings of single air source heat pump, single solar heat pump and solar air double heat source heat pump, one solar electric heat pump and multi-stage solar heat pump dual source heat pump, a solar integrated heat source heat pump is designed. The heating capacity and COP of the same heat pump and the solar double heat pump under three different operating conditions were simulated, and the simulation results were compared and analyzed. The simulation results were analyzed. The results show that the heat capacity and COP of the solar double heat pump system are higher than those of the heat pump system. With the continuous decrease of outdoor temperature, the advantages of solar wind tunnel hybrid heat pump system are more obvious.