ASHRAE Journal - January 2013 - 30

sor operation essentially making the system two-speed with the • Maintenance personnel generally have the opinion that minimum flow being the bypass when the fans shut down. The their experience and perspective are not adequately considcontrols were re-programmed but a later site visit determined the ered when designing GSHP systems. pump continued to provide excessive flow at part load. • Water treatment issues, interior piping corrosion, and In another system that experienced high plugging of strainers and heat exchangers humidity, the sequence of operation specified are significant problems in buildings with that the exhaust fans be operated only when steel interior piping. the building was occupied. Investigation re• A common complaint is the failure to vealed that the fans were operating continuprovide adequate space to service heat ously and dedicated dehumidifiers connected pump units. to the ground loop were dysfunctional. • Occupants are generally satisfied with A third system with a variable speed the response to GSHP system maintenance drive experienced frequent heat pumps trip issues. outs. Investigation revealed the supply pipe • Building automated system (BAS) diameter to each heat pump was reduced controls do not appear to be operating as to accommodate smaller control valves as intended since they received multiple comshown in Figure 8. The problem was mitiplaints from maintenance personnel, use gated when the full line size piping and more energy than room thermostat sysFigure 8: Reduced line size control tems,5 and received occupant satisfaction valves were installed. valve caused flow problems. ratings below “acceptable.” Summary and Conclusions • The long-term performance of outdoor air equipment, • For the four school districts that returned survey forms, control methods, and airflow rates should be thoroughly reeach mechanical service technicians is solely responsible for viewed since they significantly affect comfort and energy use. three to eight building HVAC systems. • The system sequence of operations should be clearly written, easily understood, and verified during startup, final inspections, and periodically reviewed. • Care should be taken in specifying and approving equipment and components to avoid unnecessary flow restrictions in the piping systems. • The size and experience level of the maintenance personnel staff should be an important design consideration when selecting equipment, piping materials, controls, and determining equipment location. • Experienced maintenance personnel recommendations are a valuable but often overlooked information source for enhanced GSHP system performance. The project was made possible with a tailored collaboration through the Electric Power Research Institute (EPRI), with the Southern Company (SoCo) and the Tennessee Valley Authority (TVA) providing the funding. Project direction and collaboration were provided by Ron Domitrovic (EPRI) and Chris Gray (SoCo).

References
1. 2. 3. 4. 5. EPRI. 2012. “Long-Term Performance of Commercial Ground Source Heat Pumps.” Final Report Draft. EP-P40851/EP-P40852. Palo Alto, Calif.: Electric Power Research Institute. Kavanaugh, S.P., J.S. Kavanaugh. 2012. “Long-term commercial GSHP performance, Part 5.” ASHRAE Journal 54(11). Dinse, D.R. 1998. “Geothermal system for school.” ASHRAE Journal 40(5). Kavanaugh, S.P., J.S. Kavanaugh. 2012. “Long-term commercial GSHP performance, Part 3.” ASHRAE Journal 54(9). Kavanaugh, S.P., J.S. Kavanaugh. 2012. “Long-Term Commercial GSHP performance, Part 2.” ASHRAE Journal 54(7).

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ASHRAE Journal

January 2013



ASHRAE Journal - January 2013

Table of Contents for the Digital Edition of ASHRAE Journal - January 2013

ASHRAE Journal - January 2013
Contents
Commentary
Industry News
Letters
Meetings and Shows
Feature Articles
Long-Term Commercial GSHP Performance: Part 6: Maintenance and Controls
Thermally Active Floors, Part 1
Technology Award Case Studies:
Aquathermal Systems
Standing Columns
Data Centers
People
Emerging Technologies
IAQ Applications
Engineer's Notebook
Washington Report
Refrigeration Applications
Classified Advertising
Advertisers Index
ASHRAE Journal - January 2013 - ASHRAE Journal - January 2013
ASHRAE Journal - January 2013 - Cover2
ASHRAE Journal - January 2013 - 1
ASHRAE Journal - January 2013 - 2
ASHRAE Journal - January 2013 - Contents
ASHRAE Journal - January 2013 - Commentary
ASHRAE Journal - January 2013 - 5
ASHRAE Journal - January 2013 - Industry News
ASHRAE Journal - January 2013 - 7
ASHRAE Journal - January 2013 - 8
ASHRAE Journal - January 2013 - 9
ASHRAE Journal - January 2013 - 10
ASHRAE Journal - January 2013 - 11
ASHRAE Journal - January 2013 - 12
ASHRAE Journal - January 2013 - 13
ASHRAE Journal - January 2013 - 14
ASHRAE Journal - January 2013 - 15
ASHRAE Journal - January 2013 - Letters
ASHRAE Journal - January 2013 - 17
ASHRAE Journal - January 2013 - Meetings and Shows
ASHRAE Journal - January 2013 - 19
ASHRAE Journal - January 2013 - 20
ASHRAE Journal - January 2013 - 21
ASHRAE Journal - January 2013 - 22
ASHRAE Journal - January 2013 - 23
ASHRAE Journal - January 2013 - Long-Term Commercial GSHP Performance: Part 6: Maintenance and Controls
ASHRAE Journal - January 2013 - 25
ASHRAE Journal - January 2013 - 26
ASHRAE Journal - January 2013 - 27
ASHRAE Journal - January 2013 - 28
ASHRAE Journal - January 2013 - 29
ASHRAE Journal - January 2013 - 30
ASHRAE Journal - January 2013 - 31
ASHRAE Journal - January 2013 - Thermally Active Floors, Part 1
ASHRAE Journal - January 2013 - 33
ASHRAE Journal - January 2013 - 34
ASHRAE Journal - January 2013 - 35
ASHRAE Journal - January 2013 - 36
ASHRAE Journal - January 2013 - 37
ASHRAE Journal - January 2013 - 38
ASHRAE Journal - January 2013 - 39
ASHRAE Journal - January 2013 - 40
ASHRAE Journal - January 2013 - 41
ASHRAE Journal - January 2013 - 42
ASHRAE Journal - January 2013 - 43
ASHRAE Journal - January 2013 - 44
ASHRAE Journal - January 2013 - 45
ASHRAE Journal - January 2013 - 46
ASHRAE Journal - January 2013 - 47
ASHRAE Journal - January 2013 - Aquathermal Systems
ASHRAE Journal - January 2013 - 49
ASHRAE Journal - January 2013 - 50
ASHRAE Journal - January 2013 - 51
ASHRAE Journal - January 2013 - 52
ASHRAE Journal - January 2013 - 53
ASHRAE Journal - January 2013 - 54
ASHRAE Journal - January 2013 - 55
ASHRAE Journal - January 2013 - 56
ASHRAE Journal - January 2013 - 57
ASHRAE Journal - January 2013 - 58
ASHRAE Journal - January 2013 - 59
ASHRAE Journal - January 2013 - 60
ASHRAE Journal - January 2013 - Data Centers
ASHRAE Journal - January 2013 - 62
ASHRAE Journal - January 2013 - 63
ASHRAE Journal - January 2013 - People
ASHRAE Journal - January 2013 - Emerging Technologies
ASHRAE Journal - January 2013 - 66
ASHRAE Journal - January 2013 - 67
ASHRAE Journal - January 2013 - IAQ Applications
ASHRAE Journal - January 2013 - 69
ASHRAE Journal - January 2013 - 70
ASHRAE Journal - January 2013 - 71
ASHRAE Journal - January 2013 - Engineer's Notebook
ASHRAE Journal - January 2013 - 73
ASHRAE Journal - January 2013 - 74
ASHRAE Journal - January 2013 - 75
ASHRAE Journal - January 2013 - Washington Report
ASHRAE Journal - January 2013 - Refrigeration Applications
ASHRAE Journal - January 2013 - Classified Advertising
ASHRAE Journal - January 2013 - Advertisers Index
ASHRAE Journal - January 2013 - 80
ASHRAE Journal - January 2013 - Cover3
ASHRAE Journal - January 2013 - Cover4
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