Performance monitoring system and methods
This article is the second in a three-part series prepared by Ground Energy Support LLC (GES) that will highlight some of the lessons learned from over 100, 000 hours of real-time ground source heat pump (GSHP) monitoring data. This is written for GSHP installers of residential and light commercial systems who want to learn how to leverage real-time Performance Monitoring to build better GSHP systems, reduce their risk and callbacks, and ensure customer satisfaction.
The focused on showing how data from real-time monitoring can be used to assess how the ground loop is performing relative to both the installed capacity and the measured heating load. The daily load profiles presented in that article are now available to GxTracker™ users as part of their Performance screens (login required to view Load Profile graph).
This article focuses on the overall system performance, factors that affect performance, how real-time monitoring can be used to evaluate performance of installed equipment, and identify and address issues before they become problems.
The number of sites represents a relatively small sample size and the different measurement techniques used at the sites result in different levels of accuracy. In spite of these limitations, we are able to identify and illustrate several factors that affect system performance. As more sites are instrumented with web-based monitoring systems that have the capability of quantifying ground loop performance, geoexchange, and electrical consumption, there will be an unprecedented ability to assess a wide range of GSHP designs over a wide range of geologic and climatic conditions.
Measuring GSHP System Performance
GSHP systems have the potential to significantly reduce the energy needs for space heating and cooling (an estimated 4 Quadrillion BTUS in the US) and reduce greenhouse gas emissions. However, these benefits will only be realized if the systems operate efficiently. Efficient operation requires proper design, installation, and maintenance.
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