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Title: Development of a Residential Ground-Source Integrated Heat Pump

Abstract

A residential-size ground-source integrated heat pump (GSIHP) system has been developed and is currently being field tested. The system is a nominal 2-ton (7 kW) cooling capacity, variable-speed unit, which is multi-functional, e.g. space cooling, space heating, dedicated water heating, and simultaneous space cooling and water heating. High-efficiency brushless permanent-magnet (BPM) motors are used for the compressor, indoor blower, and pumps to obtain the highest component performance and system control flexibility. Laboratory test data were used to calibrate a vapor-compression simulation model (HPDM) for each of the four primary modes of operation. The model was used to optimize the internal control options and to simulate the selected internal control strategies, such as controlling to a constant air supply temperature in the space heating mode and a fixed water temperature rise in water heating modes. Equipment performance maps were generated for each operation mode as functions of all independent variables for use in TRNSYS annual energy simulations. These were performed for the GSIHP installed in a well-insulated 2600 ft2(242 m2) house and connected to a vertical ground loop heat exchanger(GLHE). We selected a 13 SEER (3.8 CSPF )/7.7 HSPF (2.3 HSPF, W/W) ASHP unit with 0.90 Energy Factor (EF) resistance watermore » heater as the baseline for energy savings comparisons. The annual energy simulations were conducted over five US climate zones. In addition, appropriate ground loop sizes were determined for each location to meet 10-year minimum and maximum design entering water temperatures (EWTs) to the equipment. The prototype GSIHP system was predicted to use 52 to 59% less energy than the baseline system while meeting total annual space conditioning and water heating loads.« less

Authors:
 [1];  [1];  [2];  [3];  [1];  [1]
  1. ORNL
  2. ClimateMaster, Inc.
  3. Thermal Energy System Specialists, LLC
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE Office of Energy Efficiency and Renewable Energy (EERE)
OSTI Identifier:
1061546
DOE Contract Number:  
DE-AC05-00OR22725
Resource Type:
Conference
Resource Relation:
Conference: 2013 ASHRAE Winter Conference, Dallas, TX, USA, 20130126, 20130130
Country of Publication:
United States
Language:
English
Subject:
Ground-Source; Heat Pump; Energy Efficiency; Water Heating

Citation Formats

Rice, C Keith, Baxter, Van D, Hern, Shawn, McDowell, Tim, Munk, Jeffrey D, and Shen, Bo. Development of a Residential Ground-Source Integrated Heat Pump. United States: N. p., 2013. Web.
Rice, C Keith, Baxter, Van D, Hern, Shawn, McDowell, Tim, Munk, Jeffrey D, & Shen, Bo. Development of a Residential Ground-Source Integrated Heat Pump. United States.
Rice, C Keith, Baxter, Van D, Hern, Shawn, McDowell, Tim, Munk, Jeffrey D, and Shen, Bo. 2013. "Development of a Residential Ground-Source Integrated Heat Pump". United States.
@article{osti_1061546,
title = {Development of a Residential Ground-Source Integrated Heat Pump},
author = {Rice, C Keith and Baxter, Van D and Hern, Shawn and McDowell, Tim and Munk, Jeffrey D and Shen, Bo},
abstractNote = {A residential-size ground-source integrated heat pump (GSIHP) system has been developed and is currently being field tested. The system is a nominal 2-ton (7 kW) cooling capacity, variable-speed unit, which is multi-functional, e.g. space cooling, space heating, dedicated water heating, and simultaneous space cooling and water heating. High-efficiency brushless permanent-magnet (BPM) motors are used for the compressor, indoor blower, and pumps to obtain the highest component performance and system control flexibility. Laboratory test data were used to calibrate a vapor-compression simulation model (HPDM) for each of the four primary modes of operation. The model was used to optimize the internal control options and to simulate the selected internal control strategies, such as controlling to a constant air supply temperature in the space heating mode and a fixed water temperature rise in water heating modes. Equipment performance maps were generated for each operation mode as functions of all independent variables for use in TRNSYS annual energy simulations. These were performed for the GSIHP installed in a well-insulated 2600 ft2(242 m2) house and connected to a vertical ground loop heat exchanger(GLHE). We selected a 13 SEER (3.8 CSPF )/7.7 HSPF (2.3 HSPF, W/W) ASHP unit with 0.90 Energy Factor (EF) resistance water heater as the baseline for energy savings comparisons. The annual energy simulations were conducted over five US climate zones. In addition, appropriate ground loop sizes were determined for each location to meet 10-year minimum and maximum design entering water temperatures (EWTs) to the equipment. The prototype GSIHP system was predicted to use 52 to 59% less energy than the baseline system while meeting total annual space conditioning and water heating loads.},
doi = {},
url = {https://www.osti.gov/biblio/1061546}, journal = {},
number = ,
volume = ,
place = {United States},
year = {2013},
month = {1}
}

Conference:
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