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Title: Microprocessor control of a ground water heat pump. Final report

Abstract

This project was a demonstration of the energy savings available to a small well-insulated facility when a properly designed heat pump is operated against a source of constant temperature ground water or pond water. To date, we have assembled the electronic logging devices required to prove the resultant savings. Data to date, (15 November, 1980) is sparse as we are just entering a full heating season. It is expected that a complete data log will be submitted next spring. Initial energy savings computations follow - the system efficiency is impressive. A typical winter day savings is about $24.00 or $720.00 monthly. The system utilizes the 55/sup 0/F ground water directly for summer cooling. The summer savings are estimated to be about $18.00/day or $540.00 monthly. Circuits and diagrams of the microprocessor control system and data logger are presented. Some sample data are included. (WHK)

Publication Date:
Research Org.:
Telesis Lab., Chillicothe, OH (USA)
OSTI Identifier:
6651464
Alternate Identifier(s):
OSTI ID: 6651464
Report Number(s):
DOE/R5/10149-2
DOE Contract Number:
FG02-79R510149
Resource Type:
Technical Report
Country of Publication:
United States
Language:
English
Subject:
32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION; GROUND SOURCE HEAT PUMPS; COMPUTERIZED CONTROL SYSTEMS; DATA ACQUISITION SYSTEMS; CATHODE RAY TUBES; DEMONSTRATION PROGRAMS; DIAGRAMS; DISPLAY DEVICES; ECONOMICS; EFFICIENCY; ELECTRONIC CIRCUITS; MICROPROCESSORS; COMPUTERS; CONTROL SYSTEMS; ELECTRON TUBES; HEAT PUMPS; MICROELECTRONIC CIRCUITS 320100* -- Energy Conservation, Consumption, & Utilization-- Buildings

Citation Formats

Not Available. Microprocessor control of a ground water heat pump. Final report. United States: N. p., 1980. Web. doi:10.2172/6651464.
Not Available. Microprocessor control of a ground water heat pump. Final report. United States. doi:10.2172/6651464.
Not Available. Tue . "Microprocessor control of a ground water heat pump. Final report". United States. doi:10.2172/6651464. https://www.osti.gov/servlets/purl/6651464.
@article{osti_6651464,
title = {Microprocessor control of a ground water heat pump. Final report},
author = {Not Available},
abstractNote = {This project was a demonstration of the energy savings available to a small well-insulated facility when a properly designed heat pump is operated against a source of constant temperature ground water or pond water. To date, we have assembled the electronic logging devices required to prove the resultant savings. Data to date, (15 November, 1980) is sparse as we are just entering a full heating season. It is expected that a complete data log will be submitted next spring. Initial energy savings computations follow - the system efficiency is impressive. A typical winter day savings is about $24.00 or $720.00 monthly. The system utilizes the 55/sup 0/F ground water directly for summer cooling. The summer savings are estimated to be about $18.00/day or $540.00 monthly. Circuits and diagrams of the microprocessor control system and data logger are presented. Some sample data are included. (WHK)},
doi = {10.2172/6651464},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Tue Jan 01 00:00:00 EST 1980},
month = {Tue Jan 01 00:00:00 EST 1980}
}

Technical Report:

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  • Progress is reported in completing the electronics system for a microprocessor-controlled ground-water heat pump. Problems with well drilling are also reported, and two associated cautions are given: many domestic well drillers are unfamiliar with high volume well flow problems, and a screen bottom section is needed in a high volume well. (LEW)
  • To study the performance of a variable capacity heat pump and to implement control strategies that will minimize the energy consumption of the system over a range of operating conditions, an electrically driven air to water heat pump has been designed and tested. The performance characteristics of this advanced system when operating both under full load and part load conditions have been established and its ability to conserve energy when compared to a conventional system has been demonstrated. Results show that an improvement in energy savings of around 9% can be achieved. Further to the energy savings of the system,more » lower power consumption is required at start up when using a capacity controlled heat pump, thus increasing its possible application in the domestic sector.« less
  • An analysis is performed of ground-coupled stand-alone and series configured solar-assisted liquid-to-air heat pump systems for residences. The year-round thermal performance of these systems for space heating, space cooling, and water heating is determined by simulation and compared against non-ground-coupled solar heat pump systems as well as conventional heating and cooling systems in three geographic locations: Washington, DC, Fort Worth, Texas, and Madison, Wisconsin. The results indicate that without tax credits a combined solar/ground-coupled heat pump system for space heating and cooling is not cost competitive with conventional systems. Its thermal performance is considerably better than non-ground-coupled solar heat pumpsmore » in Fort Worth. Though the ground-coupled stand-alone heat pump provides 51 percent of the heating and cooling load with non-purchased energy in Fort Worth, its thermal performance in Washington and Madison is poor.« less
  • Experiments have been performed during the winter of 1983 to 1984 with three identical unoccupied houses equipped with heat pumps installed in three different configurations: conventional, single pass crawl space assisted and total recycle crawl space assisted. Analysis of the data obtained shows that the crawl space air is warmed by the ground under the crawl space and also by heat leaked from the house floor and heat ducts. The performance of the heat pumps in the crawl space assisted configurations increased significantly. The heating loads of the houses also increased, largely offsetting the heat pump performance gains. An experimentally-verifiedmore » model of the crawl space configurations based on DOE-2.1B was used to simulate seasonal system performance in three locations under a variety of operating strategies and ranges. Overall, no significant savings were realized for crawl space-assisted configurations. Cold climates were found conducive to efficient crawl space utilization. Seasonal savings of 3% were found for the total recycle system in Madison. Both crawl space systems in milder climates showed negligible or negative benefits. A principal crawl space-assisted system attribute was found to be a significant reduction in peak electrical demand (25 to 30) percent from reduced heat pump defrost operation coincident with backup resistance heating.« less
  • The purpose of this project was to demonstrate a high efficiency ground coupled heat pump for residential use. The most important aspect of the demonstration was the method of ground coupling for the heat pump. The system used a water well and closed loop heat exchanger for ground coupling in a method that is practical and may be widely applied in the central Texas area. The heat pump system was installed in a typical family residence in Austin, Texas, and used as the only means of heating and cooling for one year. System performance was monitored and operating data weremore » recorded and compared with predictions made during the design phase of this project. A summary of the project and a list of conclusions concerning the performance and practicality of the heat pump system demonstrated are presented. The design of the system and predictions made for its performance are discussed. The measured performance of the demonstration system is discussed. A cost comparison of the demonstration system and a more conventional heat pump system is included. Cost figures for the demonstration system are presented there.« less