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Title: Case study of a mine water heat pump system

 [1];  [1]
  1. ORNL
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Building Technologies Research and Integration Center (BTRIC)
Sponsoring Org.:
OSTI Identifier:
DOE Contract Number:
Resource Type:
Resource Relation:
Conference: IEA ECES Greenstock 2015, Beijing, China, 20150519, 20150521
Country of Publication:
United States

Citation Formats

Liu, Xiaobing, and Malhotra, Mini. Case study of a mine water heat pump system. United States: N. p., 2015. Web.
Liu, Xiaobing, & Malhotra, Mini. Case study of a mine water heat pump system. United States.
Liu, Xiaobing, and Malhotra, Mini. 2015. "Case study of a mine water heat pump system". United States. doi:.
title = {Case study of a mine water heat pump system},
author = {Liu, Xiaobing and Malhotra, Mini},
abstractNote = {},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = 2015,
month = 1

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  • The surface mining of Midwestern coals often causes detrimental changes in associated surface and ground water supplies. The Iowa Coal Project was initiated to study the economic feasibility of the surface mining of Iowa's coal and the subsequent reclamation of areas affected by mining. One portion of this study is designated to monitor the hydrogeological impacts of mining on a 40 acre study site in southeastern Iowa. The purpose of this environmental is two fold. The first objective is to monitor the ground water quality of the mine site for alterations caused by acid effluent generated in mining cuts, highwalls,more » and spoil storage areas. The second objective is to measure the piezometric changes which occur in the geologic materials in and around the mine. A monitoring network of 49 ground water piezometers and sampling tubes has been placed to accomplish these goals. Additional hydrogeologic data pertaining to the materials of the study site were obtained from drilling logs of 35 auger holes and 26 coal exploration holes. Documentation of background conditions was achieved by fitting many of the exploration borings with sampling tubes. All wells are constructed of 1 1/2 and 2 inch PVC pipe with slotted screens surrounded by pea rock. Nesting of several well casings in individual auger holes allows for an analysis of the vertical distribution of the water which is resaturating the spoil. Bentonite backfill in the holes limits leakage between the different materials penetrated in each location.« less
  • In this paper, a hotel with hybrid geothermal heat pump system (HyGSHP) in the Pensacola is selected and simulated by the transient simulation software package TRNSYS [1]. To verify the simulation results, the validations are conducted by using the monthly average entering water temperature, monthly facility consumption data, and etc. And three types of HVAC systems are compared based on the same building model and HVAC system capacity. The results are presented to show the advantages and disadvantages of HyGSHP compared with the other two systems in terms of energy consumptions, life cycle cost analysis.
  • This paper summarizes a case study of an innovative ground source heat pump (GSHP) system that uses flooded mines as a heat source and heat sink. This GSHP system provides space conditioning to a 56,000 sq ft 2(5,203 m 2) newly constructed research facility, in conjunction with supplementary existing steam heating and air-cooled chiller systems. Heat transfer performance and overall efficiency of the GSHP system were analysed using the available measured data from January through July 2014. The performance analysis identified some issues with using mine water for cooling and the integration of the GSHP system with the existing steammore » heating system. Recommendations were made to improve the control and operation of the GSHP system. These recommendations, in conjunction with the available measured data, were used to predict the annual energy use of the system. Finally, the energy and cost savings and CO 2 emission reduction potential of the GSHP system were estimated by comparing with a baseline scenario. This case study provides insights into the performance of and potential issues with the mine-water source heat pump system, which is relatively under-explored compared to other GSHP system designs and configurations.« less
  • A coal property in southern Illinois is being studied as a shallow longwall coal mine at depths averaging 250 ft and as shallow as 180 ft. The shallowness results in a super-critical panel width (depth much less than width) with 850-ft panels. The fractures associated with full-extraction coal mining wall likely reach the surface and act as pathways for water migration. The shallow subsidence phenomena result in a more gentle lowering of overlying strata in large blocks with ``tearing`` at the margins of the panels developing continuous potential water pathways. Strain zone predictions indicate fracturing of strata from the miningmore » horizon to the surface. Bed separations caused by subsidence in the strata and below a sandstone aquifer could result in ponding of waters that could be suddenly released into the mine at rates several times the normal steady-state inflow. Timing mining under streams for dry seasons will also minimize water intrusion potentials. Silting-up of pathways and resettlement of strata will eventually reduce water flows in an area. Recognizing areas of mining with panel edges intersecting water sources and pathways can allow pre-planning for water handling.« less