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RESEARCH PAPERS

Evaluation of a High-Performance Solar Home in Loveland, Colorado

[+] Author and Article Information
Robert Hendron

 National Renewable Energy Laboratory, 1617 Cole Boulevard, Golden, CO 80401-3393boḇhendron@nrel.gov

Mark Eastment

 National Renewable Energy Laboratory, 1617 Cole Boulevard, Golden, CO 80401-3393

Ed Hancock, Greg Barker

 Mountain Energy Partnership, Boulder, CO 80304

Paul Reeves

 Partnership for Resource Conservation, Boulder, CO 80302

J. Sol. Energy Eng 129(2), 226-234 (Aug 08, 2006) (9 pages) doi:10.1115/1.2710248 History: Received May 19, 2005; Revised August 08, 2006

Building America (BA) partner McStain Neighborhoods built the Discovery House in Loveland, CO, with an extensive package of energy-efficient features, including a high-performance envelope, efficient mechanical systems, a solar water heater integrated with the space-heating system, a heat-recovery ventilator (HRV), and ENERGY STAR appliances. The National Renewable Energy Laboratory (NREL) and Building Science Consortium conducted short-term field-testing and building energy simulations to evaluate the performance of the house. These evaluations are utilized by BA to improve future prototype designs and to identify critical research needs. The Discovery House building envelope and ducts were very tight under normal operating conditions. The HRV provided fresh air at a rate of about 35Ls(75cfm), consistent with the recommendations of ASHRAE Standard 62.2. The solar hot water system is expected to meet the bulk of the domestic hot water (DHW) load (>83%), but only about 12% of the space-heating load. DOE-2.2 simulations predict whole-house source energy savings of 54% compared to the BA Benchmark (Hendron, R., 2005 NREL Report No. 37529, NREL, Golden, CO). The largest contributors to energy savings beyond McStain’s standard practice are the solar water heater, HRV, improved air distribution, high-efficiency boiler, and compact fluorescent lighting package.

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Copyright © 2007 by American Society of Mechanical Engineers
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References

Figures

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Figure 5

Clothes washer machine energy use under various operating conditions; extra rinse used for warm/warm and 1.4kg(3lb) warm/warm cycles

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Figure 6

Clothes-dryer electricity use under various operating conditions

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Figure 7

Clothes-dryer natural gas use under various operating conditions

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Figure 8

Dishwasher electricity and hot water consumption under various test conditions

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Figure 9

Schematic design of domestic hot water and space-heating system

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Figure 10

TRNSYS simulation results for the solar hot water system as currently implemented

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Figure 11

TRNSYS results if heating coil water does not run through the solar storage tank and the minimum supply temperature for the solar storage tank is set to 90°F(32°C)

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Figure 12

DOE-2 model geometry as viewed from the southwest, generated using eQuest

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Figure 13

DOE-2 model geometry as viewed from the northeast with shading surfaces hidden, generated using eQuest

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Figure 14

Influence of efficiency measures on end-use energy consumption

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Figure 4

Clothes washer hot water use under various operating conditions; extra rinse used for warm/cold and 1.4kg(3lb) warm/warm cycles

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Figure 3

Interior temperatures during the first week of short-term testing

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Figure 2

Tracer gas measurements at the Discovery House

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Figure 1

McStain Discovery House (view from south)

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