| In China,with the steady progress of urbanization,building energy consumption is also increasing rapidly.According to China's geographical location and climatecharacteristics,the demand for HVAC is very common;according to statistics,building energy consumption accounts for about 20%,and HVAC accounts for about60%of building energy consumption.Therefore,the application research ofsolar-assisted ground source heat pump as a heat source and indoor capillary heating and air conditioning system was conducted.On the one hand,the use efficiency of ground source heat pump in Changchun area was studied.,And research onstrategies to improve energy efficiency,on the other hand,in view of the outdoor climate characteristics of winter in severe cold areas in China,looking for both energy-saving and environmentally friendly indoor heating forms to provide a theoretical basis for building energy conservation in Changchun.The main research contents are as follows:the indoor comfort evaluation ofpublic buildings in Changchun and the current status of high energy consumption of local buildings are analyzed,and the reasons are analyzed;according to the geological and climatic data of Changchun area,available clean energy is analyzed,and solarand geothermal energy are fully tapped The use of solar energy-assistedground-source heat pump energy supply system is experimentally studied.Theoperating parameters and power consumption parameters of the unit during the test are tested for energy efficiency testing.The indoor thermal environment of different indoor capillary installation locations and fresh air methods is analyzed.Determine the most suitable capillary laying position,water supply temperature,tube flowvelocity,fresh air supply mode,and supply air temperature;finally,carry out simulation of the physical model of the laboratory,study the distribution of indoor thermalenvironment at different water supply temperatures,and optimize the Program analysis.This article first introduces the combined system of solar-assisted ground-source heat pump and two kinds of terminal energy supply methods:capillary ceilinginstallation mixed ventilation,capillary floor installation displacement ventilation;and for a heating season in 2018,the units and systems of the heat source combined system The performance is measured and researched.It is found that under thepremise of a certain water supply temperature,the larger the number of start-stops of the unit,the lower COP.Heat can effectively increase system stability.Secondly,on typical winter days,test the monitoring points in the vertical and horizontal directions of the experimental room,and study the use of capillary floor laying displacement ventilation and capillary ceiling laying mixed ventilation end heating methods.During the period of stable heating,the vertical The effects ofradiation asymmetry and air movement on the comfort of the personnel movement area and the indoor hot and humid environment.It is found that in the winter,the indoor personnel movement area with capillary floor laying+displacementventilation composite air conditioning system has lower wind speed,more uniform temperature field and humidity field,can adapt to changes in heat and humidity ratio,and uses low-grade thermal energy to save energy consumption and comfort.Greatly improve.Based on the experimental data,numerical simulation was carried out,and a laboratory model was established using Airpak software to simulate outdoor conditions in cold regions.The building uses capillary floor radiation displacement ventilation to heat the indoor thermal environment at different water supply temperatures.The results show that the average indoor temperature of the four water supply conditions at 33?,34?,35?,and 37?are 17.40?,17.83?,18.75?,and20.6?.As the water supply temperature increases,the radiated surface temperature also increases.The temperature rises to 21.3?,22.05?,22.75?,and 23.5?;the indoor air temperature of a person sitting at 0.5min the vertical direction is 17.72?,18.3?,18.8?,20.04?;the indoor air temperature at a stand of 1.5m respectively,It is 17.07?,17.55?,18.05?,19.65?,and the vertical temperature difference is0.65?,0.75?,0.75?,0.39?,respectively;the heat provided by water supply temperature 33?,34?cannot eliminate the indoor cooling load,and the indoor temperature cannot reach the"Requirements for Design Code for Heating,Ventilation and Air Conditioning of Civil Buildings[1]:The indoor design temperature of heating rooms in severe cold areas should be 18?-24?;when the water supply temperature is 37?,the indoor hot and humid environment is the closest to the design value,and forecast personnel do not The satisfaction rate is less than 27%.The simulation results obtained are in good agreement with the measured water temperature at37?.Under the simulated conditions,the capillary radiation area is optimized and the capillary is fully covered.At this time,the indoor temperature is significantly higher than the indoor temperature when the capillary laying area is 85%under the experimental conditions.The capillary laying area should achieve the same indoor environment,and appropriately reducing the water supply temperature can achieve the effect of energy saving.Considering the economics and practicality in engineering applications,it is recommended that the water supply temperature for capillary floor laying be 37-40?. |
PDF Full Text Request