Ground-Source Integrated Heat Pump for Near-Zero Energy Houses: Technology Status Report

Murphy, Richard; Rice, C Keith; Baxter, Van D.; Craddick, W.G.

doi:10.2172/969947

Cited by 7 publications

(9 citation statements)

References 8 publications

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“…Other advantages from eliminating desuperheating operation include switching from a multiple-speed to a single-speed water pump, elimination of a water temperature control valve, and overall simplification of the IHP control scheme . See the discussion in the GS-IHP status report by Murphy et al (2007b) for a fuller discussion of the system design implications. Elimination of desuperheating operation also yielded a major reduction in the run time for the pump, with expected attendant benefits of increased pump life.…”

Section: Analysis Approach and Resultsmentioning

confidence: 99%

Air-Source Integrated Heat Pump for Near-Zero Energy Houses: Technology Status Report

Murphy¹,

Rice²,

Baxter³

et al. 2007

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Section: Analysis Approach and Resultsmentioning

confidence: 99%

Air-Source Integrated Heat Pump for Near-Zero Energy Houses: Technology Status Report

Murphy¹,

Rice²,

Baxter³

et al. 2007

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“…ORNL developed a general concept design for such an appliance, called the IHP. The IHP concept was summarized in the final report for International Energy Agency (IEA) Heat Pumping Technologies (HPT) Annex 40 [16] with full details available in related reports [17,18].…”

Section: Ihp Development Backgroundmentioning

confidence: 99%

Technology Development and Field Monitoring in nZEB - US Country report IEA HPT Annex 49 Task 3

Baxter

Technologies²,

Abu-Heiba

et al. 2020

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The International Energy Agency (IEA) Heat Pumping Technologies (HPT) Annex 49, "Design and Integration of Heat Pumps for Nearly Zero Energy Buildings," deals with the application of heat pumps (HPs) as a core component of the HVAC system for nearly or net-zero energy buildings. This report covers the Task 3 activities of the US team. Three institutions are involved on the US team and have worked on the following projects. • Oak Ridge National Laboratory (ORNL) summarized development activities since the conclusion of IEA HPT Annex 40 for several integrated HP (IHP) systems-electric groundsource IHP and air-source IHP versions and engine-driven AS-IHP version. • The University of Maryland partnered with ORNL and Blue Bear Management to develop a personal cooling device called RoCo that can provide personalized conditioned air to occupants in inadequately or unconditioned environments. With RoCo, building facility management can elevate the HVAC thermostat settings without compromising occupants' thermal comfort. Researchers have found that a 4°F increase in thermostat settings can save 12-30% energy savings. Therefore, RoCo is a promising technology that can help reduce building energy consumption and facilitate achievement of net-zero energy building performance. • The National Institute of Standards and Technology (NIST) is working on a field study effort on the NIST Net-Zero Energy Residential Test Facility. Two air-source split-system HPs were installed in a residential, net-zero energy home that was constructed as a laboratory on the NIST campus in Gaithersburg, Maryland. The first HP was a two-stage, 7 kW (2 ton), 15.8 seasonal energy efficiency ratio (SEER), 9.05 heating seasonal performance factor (HSPF) conventionally ducted system; the second HP was a variable-speed, 10.6 kW (3 ton), 14 SEER, 8.35 HSPF, high-velocity ducted system. These two systems operated side by side, using separate supply ducts and a common return duct, on a weekly alternating schedule to condition the home that was operated with very consistent simulated thermal loads. The team wanted to determine whether the high-velocity system could provide comparable energy-use efficiency to the conventional system. The results of this study showed that it did meet the required loads and had slightly greater efficiency; the average cooling coefficient of performance (COP) was (0.40 ± 0.11) higher, and the average heating COP was statistically equal. A new firmware was provided at the end of the heating season that greatly improved the performance of the high-velocity system; its average heating COP went from (1.8 ± 0.9) to (2.5 ± 1.1) at a 95% confidence level. The new firmware heating COP averaged (1.05 ± 0.23) higher than the old firmware over the same outdoor temperatures. The defrost performance is very different for these two systems, yet they consumed equivalent energy per HDD. The conventional system uses a timed-initiate, temperature-terminate algorithm with auxiliary electric resistive heating, whereas the high-velocity system uses ca...

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“…Full details of the GS-IHP concept development can be found in the report by Murphy, et al (2007) and are briefly summarized here to provide a context for the subsequent system development activities under the CRADA. This system concept ( Figure 1) uses one variable-speed (VS) modulating compressor, a VS indoor blower, a VS pump for ground heat exchanger (GHX) fluid circulation, and a single-speed pump for hot water circulation.…”

Section: Background -Gs-ihp Concept Developmentmentioning

confidence: 99%

“…A 50 gallon (~189 l) WH tank is included. The concept development analyses reported in Murphy et al (2007) included a dedicated dehumidification mode and a humidifier option (neither included in CM's initial prototype system described later). In addition those analyses were based on a relatively small (1800 ft 2 , 167 m 2 ) and very well insulated house with nominal cooling design loads of 1-1.5 tons (3.5-5.3 kW) depending upon location.…”

Section: Background -Gs-ihp Concept Developmentmentioning

confidence: 99%

“…One approach to achieving this is to produce a single piece of equipment that provides multiple services. In FY05-07 ORNL developed a general concept for such an appliance, called the integrated heat pump (IHP) [Murphy, et al 2007]. Successful achievement of its goal requires that DOE not only develop the IHP concept, but must facilitate introduction of such equipment to the US building market.…”

Section: Introductionmentioning

confidence: 99%

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Ground Source Integrated Heat Pump (GS-IHP) Development

Baxter¹,

Rice²,

Murphy³

et al. 2013

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ORNL and ClimateMaster, Inc. (CM) engaged in a Cooperative Research and Development Agreement (CRADA) to develop a groundsource integrated heat pump (GS-IHP) system for the US residential market. A initial prototype was designed and fabricated, lab-tested, and modeled in TRNSYS (SOLAR Energy Laboratory, et al, 2010) to predict annual performance relative to 1) a baseline suite of equipment meeting minimum efficiency standards in effect in 2006 (combination of air-source heat pump (ASHP) and resistance water heater) and 2) a state-of-the-art (SOA) two-capacity ground-source heat pump with desuperheater water heater (WH) option (GSHPwDS). Predicted total annual energy savings, while providing space conditioning and water heating for a 2600 ft 2 (242 m 2 ) house at 5 U.S. locations, ranged from 52 to 59%, averaging 55%, relative to the minimum efficiency suite. Predicted energy use for water heating was reduced 68 to 78% relative to resistance WH. Predicted total annual savings for the GSHPwDS relative to the same baseline averaged 22.6% with water heating energy use reduced by 10 to 30% from desuperheater contributions.The 1 st generation (or alpha) prototype design for the GS-IHP was finalized in 2010 and field test samples were fabricated for testing by CM and by ORNL. Two of the alpha units were installed in 3700 ft 2 (345 m 2 ) houses at the ZEBRAlliance site in Oak Ridge and field tested during 2011. Based on the steady-state performance demonstrated by the GS-IHPs it was projected that it would achieve >52% energy savings relative to the minimum efficiency suite at this specific site. A number of operational issues with the alpha units were identified indicating design changes needed to the system before market introduction could be accomplished. These were communicated to CM throughout the field test period.Based on the alpha unit test results and the diagnostic information coming from the field test experience, CM developed a 2 nd generation (or beta) prototype in 2012. Field test verification units were fabricated and installed at the ZEBRAlliance site in Oak Ridge in May 2012 and at several sites near CM headquarters in Oklahoma. Field testing of the units continued through February 2013. Page 2 of 38Annual performance analyses of the beta unit (prototype 2) with vertical well ground heat exchangers (GHX) in 5 U.S. locations predict annual energy savings of 57% to 61%, averaging 59% relative to the minimum efficiency suite and 38% to 56%, averaging 46% relative to the SOA GSHPwDS. Based on the steady-state performance demonstrated by the test units it was projected that the 2 nd generation units would achieve ~58% energy savings relative to the minimum efficiency suite at the Zebra Alliance site with horizontal GHX.A new product based on the beta unit design was announced by CM in 2012 -the Trilogy 40 ® Q-mode™

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Ground-Source Integrated Heat Pump for Near-Zero Energy Houses: Technology Status Report

Cited by 7 publications

References 8 publications

Air-Source Integrated Heat Pump for Near-Zero Energy Houses: Technology Status Report

Air-Source Integrated Heat Pump for Near-Zero Energy Houses: Technology Status Report

Technology Development and Field Monitoring in nZEB - US Country report IEA HPT Annex 49 Task 3

Ground Source Integrated Heat Pump (GS-IHP) Development

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