GHP Data Collection and Monitoring System at the SRRL

Transcription

1 GHP Data Collection and Monitoring System at the SRRL Presented by: Samuel Booth May 12, 2011 NREL Point of Contact: Neil Popovich NREL is a national laboratory of the U.S. Department of Energy, Office of Energy Efficiency and Renewable Energy, operated by the Alliance for Sustainable Energy, LLC.

2 Overview What is a heat pump and how does it work Project overview: site, geothermal well field, and building heat pump design details Scope of work Typical sensor installation and interactive web page data display Outcome of the work Current project status National Renewable Energy Laboratory Slide 2

3 What is a Heat Pump & How does it work? The ground loop transfers ground energy to a refrigerant in the heat pump Heat Pump Compressor Increasing the pressure increases in the temperature Heat is transferred to the heating fluid or air handler Evaporator Condenser Expansion Valve Heat is transferred to the room by radiant floor heating or air distribution system Refrigerant expands causing it to cool

4 GHP Showcase Project Site Solar Radiation & Research Laboratory Instrument Calibration Weather Observations Measurement Research Support National Renewable Energy Laboratory Slide 4

5 SRRL Project & GHP Field Existing 2,688 ft 2 23 Borehole 300 deep Addition 1,896 ft '32.18"N, '44.85"W National Renewable Energy Laboratory Slide 5

6 National Renewable Energy Laboratory Slide 6 Heat & Cooling Loads on the SRRL Heating Peak & Cooling Load Loads kbtu/month Peak kbtu/hr per Month Peak Cooling Peak Total Heating Cooling Total Heating Month

7 National Renewable Energy Laboratory Slide 7 11 heat pumps Heat Pumps- System Design 2 Building circulation pumps one is backup Activated by any 1 heat pump calling for flow If no heat pump is activated, circulation pump is shut off 2 Borefield loop pump VFD Energy Recovery Ventilators Occupied 24/7/365

8 Scope of the Project This Activity will: Install extensive sensor array to monitor the heat pump and geothermal well field system Collect detailed field data during the commissioning and operation of the systems. Help to understand the capabilities and limitations of existing design tools. Be used to develop case studies to improve commissioning and certification of GHP systems. Satisfy the need to provide an objective, statistically valid database of GHP system performance.

9 National Renewable Energy Laboratory Slide 9 Ground Loop Sensors Numerous sensors (>200!) throughout the ground loop and the building supply header Immersion Thermistors in Building Header Thermocouple Sensors in Wells

10 Ground Loop Sensors Evaluation of standard wells, double U-tube wells, enhanced grout wells and zone of thermal influence National Renewable Energy Laboratory Slide 10

11 National Renewable Energy Laboratory Slide 11 Interactive Web Page of Real Time Data Real time data display of energy usage and temperature from each of the 11 heat pumps

12 National Renewable Energy Laboratory Slide 12 Interactive Web Page of Real Time Data Real time data display of temperature in each well

13 National Renewable Energy Laboratory Slide 13 What will we learn? What is the Zone of Influence of a borehole? At what distances is there Thermal Interference from one borehole to another? What is the long term efficiency of the system? Borehole thermal conductivity tests vs. TC rock properties Temperature affect of pipe from top of boreholes to header in mechanical room? Are there significant beneficial affects of double U- tube on thermal performance? The increased affects to thermal transfer on thermally enhanced grout.

14 National Renewable Energy Laboratory Slide 14 WHAT CAN THIS DATA DO? R&D Technology Validation Apps Policy Market Exposure Growing GHP Market

15 National Renewable Energy Laboratory Slide 15 Where are we now? Wells are installed Building expansion is near completion (6/1/11) 11 Heat pumps installed Sensor connections are on-going

16 Envisioning An NREL Geothermal Campus Graphic: NREL, Devin Egan

17 Thank You! QUESTIONS? Neil Popovich National