GEOTHERMAL TECHNOLOGIES LEGACY COLLECTION - Bibliographic Citation


Bibliographic Citation


Full Text: This document is not available electronically. More about document availability.
Title: Exergy Analysis and Operational Efficiency of a Horizontal Ground Source Heat Pump System Operated in a Low-Energy Test House under Simulated Occupancy Conditions
Creator/Author: Ally, Moonis Raza [ORNL] ; Baxter, Van D [ORNL] ; Munk, Jeffrey D [ORNL] ; Gehl, Anthony C [ORNL]
Publication Date:2012 Jan 01
OSTI Identifier:OSTI 1048146
Report Number(s):None
DOE Contract Number:DE-AC05-00OR22725
Document Type:Journal Article
Specific Type:
Coverage:
Resource Relation:Journal Name: International Journal of Refrigeration; Journal Volume: 35; Journal Issue: 4
Other Number(s):
Research Org:Oak Ridge National Laboratory (ORNL); Building Technologies Research and Integration Center
Sponsoring Org:EE USDOE - Office of Energy Efficiency and Renewable Energy (EE)
Subject:15 GEOTHERMAL ENERGY; DESIGN; EFFICIENCY; ENERGY ANALYSIS; EXERGY; GROUND SOURCE HEAT PUMPS; HEAT GAIN; HEATING; PERFORMANCE; POWER INPUT; POWER LOSSES; ROOFS; WINDOWS
Keywords:: Exergy analysis; Second Law analysis; heat pumps; ground source; thermodynamics; coefficient of performance; sustainable technology
Description/Abstract:This paper presents data, analyses, measures of performance, and conclusions for a ground-source heat pump (GSHP) providing space conditioning to a 345m2 house whose envelope is made of structural insulated panels (SIP). The entire thermal load of this SIP house with RSI-3.7 (RUS-21) walls, triple pane windows with a U-factor of 1.64 W/m2 K (0.29 Btu/h ft2 oF) and solar heat gain coefficient (SHGC) of 0.25, a roof assembly with overall thermal resistance of about RSI-8.8 (RUS-50) and low leakage rates of 0.74 ACH at 50Pa was satisfied with a 2.16-Ton (7.56 kW) GSHP unit consuming negligible (9.83kWh) auxiliary heat during peak winter season. The highest and lowest heating COP achieved was 4.90 (October) and 3.44 (February), respectively. The highest and lowest cooling COP achieved was 6.09 (April) and 3.88 (August). These COPs are calculated on the basis of the total power input (including duct, ground loop, and control power losses ). The second Law (Exergy) analysis provides deep insight into how systemic inefficiencies are distributed among the various GSHP components. Opportunities for design and further performance improvements are identified. Through Exergy analysis we provide a true measure of how closely actual performance approaches the ideal, and it unequivocally identifies, better than energy analysis does, the sources and causes of lost work, the root cause of system inefficiencies.
Publisher:
Country of Publication:US
Language:English
Size/Format:Medium: X; Size: 1092-1103
Rights:
Availability:
System Entry Date:2013 Jun 06
 View Non-Empty Fields Only

Top

Some links on this page may take you to non-federal websites. Their policies may differ from this site.