| From the hot topic of "Southern Heating", this article summarized the current research on the solution of the southern heating, analysised the superiority of air-source heat pump as a solution to the southern heating. Due to the dramatically changes of air-source heat pump in outdoor environment, especially mountain villages in Chongqing, there exists more prominent problems like low efficiency and slow heating speed in the process of heat pump using, so enhancing the efficiency of heat pump under the condition of limited resources becomes very important.First of all, field researches were carried out in 300 households in typical towns in Chongqing, the heating methods and demands in winter were surveyed through the actual visit and test. This paper combined the indoor thermal and humidity environment with the renewable energy status, summed up the specificity of heating in mountain village-- live scattered, lack of resources, cold and wet, uncomfortable.Secondly, experimental platform of air-source heat pump was established in buildings in typical agritainment, the performance of air-source heat pump in winter was measured. By changing the heat pump running set temperature(35 ?, 40 ?, 45 ?), while monitoring the outdoor temperature, water temperature, relative humidity, supply and return water temperature, water flow, power and other parameters, the process of analyzing the heat pump operation for changes of heat, power consumption, COP. Mainly reflected in the following aspects:According to the running parameters of heat pump, the running process can be divided into the starting stage, stable stage and the whole stage. During the starting stage, the system power consumption reached the maximum at 15 min, the COP value changed from 1.8 to 3.0. In addition to frost, the COP value was less than 1.5. The outdoor temperature was positively correlated with the start of COP. The significant effect of set temperature on the COP is not strong. This paper established the regression equation and regression coefficient to react that the outdoor temperature had greater impact on the start of COP than the set temperature.Stable stage accounted for more than 90% of the whole night time. Power consumption was about 10 k Wh~15k Wh and the COP was 1.5 ~ 2.0, positively related to the outdoor temperature, negatively correlated with the set the temperature, and because of the influence of frost and dew, the influence of outdoor temperature on the stability of COP was greater than the effect of the setting temperature. The whole stage integrated the characteristics of the start and stability stage, in the process of running all night, the power consumption was about 10~18k Wh, and the COP value was about 1.6~2.2.Finally, considering the characteristics of low operation efficiency of air source heat pump, enhanced the efficiency of the heat pump respectively from the preheating the heat pump and solar energy system in daytime and analysis of different settings temperature heat pump and solar system operating characteristics under different weather conditions in the daytime: in the way of preheating the heat pump, due to the extension of the operation time, the power consumption raised slightly and the performance increased to about 14%; in the way of preheating the solar energy system, performance increased by approximately 10% in cloudy days; while the power consumption in sunny days reduced greatly as a result of the good start conditions at night, the COP value increased to about 50%, and the effect was obvious. |
PDF Full Text Request