Deep recharge the thermal storage type water source heat pump performance simula
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Abstract: Currently recharge water source heat pump for deep wells group project design and construction process, the basic criterion of the system depends on the feasibility of single well the water meets the requirements, and can achieve good artificial recharge. However, good design also need to be considered the local aquifer for well water heat run with the hydrogeological conditions, environmental meteorological factors and the relationship between engineering measures. By comparing the popular author of the aquifer flow and heat transfer simulation program, the option of using the U.S. Geological Survey prepared HST3D process of a typical confined aquifer Shuangjing temperature and flow field of the annual running simulation, the procedures applied to such problems to evaluate the functionality and applicability, to point out the need for improvement.
Keywords: Deep aquifer recharge water source heat pump hot water and heat movement through building floor area ratio HST3D
1 of the problem Deep recharge water source heat pump technology as a benefit of environmental protection and sustainable development in the form of heat and cold sources, air-conditioning at home and abroad has been a growing number of engineering applications [1] [2], in [ 3] gives the basic principles and relevant technical and economic analysis. The system use of relatively constant temperature throughout the year as a water source heat pump water underground, through the construction of pumping and recharge wells group, to achieve the summer pumping cold water, irrigation water, winter pumping hot water, cold water filling the role of the rotation this year running process, the heat inside the underground aquifer or cold is extracted, storage and transfer. Wells is a deep well recharge water source heat pump system is a key component of the normal operation of whether or not determines the success or failure of application of water source heat pump systems engineering, well design group should be cautious of the Layout key. Currently works well for such group of design and construction process, the system basically depends on the feasibility criterion of a single well water meets the requirements, and can achieve good artificial recharge. However, some groups carrying out such works well feasibility analysis and design, also need to consider the following aspects:
(1) local aquifer in the energy Xucun, the transfer process. Application of deep recharge
way, need to know at the design stage to provide local energy capacity of the aquifer extent, that is, the system can afford more than the FAR limit is
Less. When the building cooling and heating load unevenly throughout the year, the system for the annual aquifer temperature effect how the aquifer will result in "background temperature" gradually decreased or increased, causing the system to fail, how to develop coping strategies related ?
(2) "hot link" to avoid the effects of
As aquifer recharge and the original temperature of the existence of differences in the role of heat conduction and convection, the recharge well water "temperature front" will result in nearly a pumping water to different levels of temperature increase or decrease, often referred to as "hot linking" phenomenon. How to determine appropriate well spacing, how to determine the layout of Wells, to avoid "hot link" with the influence of the main issues of concern to designers. For the high-density residential district or city commercial construction applications deep recharge water source heat pump system, because the available building land area restrictions, how to optimize the layout and their respective counterparts for well pumping or recharge the role of the maximum to avoid " heat through, "the negative impact is particularly critical.
(3) the role of hydrogeological conditions of
Core of the problem is how to consider the speed of a relatively large presence of the natural flow of groundwater aquifers for ground temperature and the impact of layout for well, how cool the building throughout the year in the case of uneven heat load, using the presence of natural groundwater flow field, a reasonable optimization of pumping the wells, recharge role and a rotational basis, in order to achieve optimal use of energy.
(4) ground unit and the system operating mode of the form and function
Use of "low flow, large temperature difference" of the system operation, to achieve the maximum use of aquifer storage, and reduce the minimum level for the exploitation of groundwater resources using [3]. In the "low flow, large temperature difference" and the traditional "high-volume, small temperature difference between the" two operating conditions, the water level underground water content changes in temperature year round process, and the resulting layout of the corresponding group differences in how well, is to study issues of concern to designers.
These questions have to be sought for the part of the aquifer for well water and heat movement for calculation and analysis tool to study the local aquifer for well water in thermal motion and the hydrogeological conditions, the environment between meteorological factors and engineering measures relationship, as this type of system design and analysis of relevant scientific basis, to promote the application of centralized water source heat pump unit further promotion.
In the context of this project, the author works by comparing the current academic Popular aquifer flows heat transfer simulation program, select the use of the development of the U.S. Geological Survey groundwater flow, heat transfer, mass transfer three-dimensional finite difference simulation program HST3D, of a typical confined aquifer Shuangjing of the annual temperature and flow field simulation, the process of applying the problem to evaluate the functionality and applicability, to point out the need for improvement.
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