Study On Operation Mode And Economic Performance Of Energy Storage Ground Source Heat Pump System

The rapid social development and the progress of human civilization are accompanied by the increasing energy consumption,among which the construction energy consumption accounts for about 30%of the social total energy consumption.If left unchecked,it will accelerate the energy depletion process and further aggravate the environmental pollution.Therefore,it is a pressing and imperative task to energetically develop green and renewable energy.At the same time,the peak and off-peak difference of electric load in China is pretty bigger the peak and off-peak difference of the main power grid in China exceeds 30%,so we are confronted with problems of insufficient peak and surplus valley,so the development of energy storage technology is especially important.In view of the above factors,the ground-source heat pump compounded air conditioning technology installed with energy storage system emerged at the right moment.In order to maximize the system’s economic,energy and environmental benefits.This paper takes a factory in Dachang County of Langfang City as the research object.In this study,the application research status of soil source heat pump system and energy storage system of domestic and international is analyzed,and studies the problems in the practical application of the ground source heat pump system and the energy storage system.Secondly,based on the research on the initial investment and running cost of the actual project,and establishes an optimized mathematical model with the goal of minimizing daily operating expenses.Then,the key factors affecting the energy storage ground source heat pump system are analyzed:cold storage rate and peak-to-valley electricity price ratio,including the investment recovery period,the optimal cold storage rate,and the ideal range of peak-to-valley electricity price ratio.At the same time,the simple and easy-to-operate and on-site controllable start-stop control method was introduced,and the operation cost was used as the standard for analysis.Finally,based on actual projects,comprehensive evaluations are made on the economical,energy-saving and environmental benefits of the system.The results of the research show that the optimized operating mode based on the optimized mathematical model has the lowest daily operating cost,and it saves 7%and 3%respectively over the heat pump priority and water storage priority;the optimal cold storage rate of the system is 0.334,the life cycle cost is the minimum,which is 13.72 million yuan;the peak-to-valley electricity price ratio is ideally between 2.38:1.66:1 and 3.5:1.66:1,and the operating cost of the project is low,at the same time,the range of storage rate is wider and the system configuration is easier;payback period for actual projects in this article is 6.1 years,within the acceptable range;the pollutant emission reduction of the energy storage ground source heat pump system is 20%higher than that of the independent ground source heat pump system,and the environmental benefit is remarkable.It is hoped that the research results can provide theoretical guidance and technical reserves for future engineering practice.