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Book Investigation of Gas Engine Driven Heat Pump Systems

Download or read book Investigation of Gas Engine Driven Heat Pump Systems written by C. Hickman and published by . This book was released on 1984 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Performance of Gas Engine Driven Heat Pump Unit

Download or read book Performance of Gas Engine Driven Heat Pump Unit written by and published by . This book was released on 2008 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Air-conditioning (cooling) for buildings is the single largest use of electricity in the United States (U.S.). This drives summer peak electric demand in much of the U.S. Improved air-conditioning technology thus has the greatest potential impact on the electric grid compared to other technologies that use electricity. Thermally-activated technologies (TAT), such as natural gas engine-driven heat pumps (GHP), can provide overall peak load reduction and electric grid relief for summer peak demand. GHP offers an attractive opportunity for commercial building owners to reduce electric demand charges and operating expenses. Engine-driven systems have several potential advantages over conventional single-speed or single-capacity electric motor-driven units. Among them are variable speed operation, high part load efficiency, high temperature waste heat recovery from the engine, and reduced annual operating costs (SCGC 1998). Although gas engine-driven systems have been in use since the 1960s, current research is resulting in better performance, lower maintenance requirements, and longer operating lifetimes. Gas engine-driven systems are typically more expensive to purchase than comparable electric motor-driven systems, but they typically cost less to operate, especially for commercial building applications. Operating cost savings for commercial applications are primarily driven by electric demand charges. GHP operating costs are dominated by fuel costs, but also include maintenance costs. The reliability of gas cooling equipment has improved in the last few years and maintenance requirements have decreased (SCGC 1998, Yahagi et al. 2006). Another advantage of the GHP over electric motor-driven is the ability to use the heat rejected from the engine during heating operation. The recovered heat can be used to supplement the vapor compression cycle during heating or to supply other process loads, such as water heating. The use of the engine waste heat results in greater operating efficiency compared to conventional electric motor-driven units (SCGC 1998). In Japan, many hundreds of thousands of natural gas-driven heat pumps have been sold (typically 40,000 systems annually) (Yahagi et al. 2006). The goal of this program is to develop dependable and energy efficient GHPs suitable for U.S. commercial rooftop applications (the single largest commercial product segment). This study describes the laboratory performance evaluation of an integrated 10-ton GHP rooftop unit (a 900cc Daihatsu-Aisin natural gas engine) which uses R410A as the refrigerant (GEDAC No. 23). ORNL Thermally-Activated Heat Pump (TAHP) Environmental Chambers were used to evaluate this unit in a controlled laboratory environment.

Book System Modeling of Gas Engine Driven Heat Pump

Download or read book System Modeling of Gas Engine Driven Heat Pump written by and published by . This book was released on 2012 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: To improve the system performance of the GHP, modeling and experimental study has been made by using desiccant system in cooling operation (particularly in high humidity operations) and suction line waste heat recovery to augment heating capacity and efficiency. The performance of overall GHP system has been simulated by using ORNL Modulating Heat Pump Design Software, which is used to predict steady-state heating and cooling performance of variable-speed vapor compression air-to-air heat pumps for a wide range of operational variables. The modeling includes: (1) GHP cycle without any performance improvements (suction liquid heat exchange and heat recovery) as a baseline (both in cooling and heating mode), (2) the GHP cycle in cooling mode with desiccant system regenerated by waste heat from engine incorporated, (3) GHP cycle in heating mode with heat recovery (recovered heat from engine). According to the system modeling results, by using desiccant system regenerated by waste heat from engine, the SHR can be lowered to 40%. The waste heat of the gas engine can boost the space heating efficiency by 25% in rated operating conditions.

Book Om Udkastet il en ny Communallov

Download or read book Om Udkastet il en ny Communallov written by and published by . This book was released on 1854 with total page 16 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Heat Pump Systems

Download or read book Heat Pump Systems written by International Energy Agency and published by . This book was released on 1982 with total page 208 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Research and Development of a Suitable Gas Engine Driven Heat Pump for Residential Use

Download or read book Research and Development of a Suitable Gas Engine Driven Heat Pump for Residential Use written by K. Yamagishi and published by . This book was released on 1982 with total page 20 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Test of an Improved Gas Engine driven Heat Pump

Download or read book Test of an Improved Gas Engine driven Heat Pump written by and published by . This book was released on 1998 with total page 13 pages. Available in PDF, EPUB and Kindle. Book excerpt: A new generation of natural gas engine-driven heat pump (GEHP) was introduced to the marketplace recently. While the units installed have performed exceptionally well and earned rave reviews for comfort and savings on utility bills, the higher initial cost and relatively long payback time have affected the wide commercialization of this advanced technology. According to a study done for the southeastern US in the Atlanta metropolitan area, the annual operating cost of the GEHP is less than that of a baseline system consisting of a 92% efficiency gas furnace and a SEER 12 air conditioner. The estimated payback time is around 10 years to cover the difference in initial equipment price between the new and the baseline system. It has been projected that a liquid overfeed (LOF) recuperative cycle concept can simplify the hardware design of a GEHP, resulting in reduced cost and improved performance. Laboratory tests have shown that LOF would improve the energy efficiency of a vapor compression unit by 10%. In addition, LOF will reduce the compressor pressure ratio and thereby improve equipment reliability. Based on the assumed performance improvements and cost reduction, a simple payback calculation indicates LOF can reduce the payback time for an improved GEHP considerably in the Atlanta metropolitan area. Laboratory testing of an improved GEHP has been carried out at Oak Ridge National Laboratory. This paper reports on the equipment design modifications required to implement LOF and the results of performance tests at steady-state conditions. The preliminary cooling test results have indicated that the LOF in conjunction with orifice-type expander can be applied to GEHP for cost and performance enhancements. The improvements in energy efficiency will be dependent upon several controlling parameters including the proper refrigeration charge, the selected ambient temperature, and the system operating condition.

Book Field Monitoring and Evaluation of a Residential Gas engine driven Heat Pump

Download or read book Field Monitoring and Evaluation of a Residential Gas engine driven Heat Pump written by and published by . This book was released on 1995 with total page 103 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Federal government is the largest single energy consumer in the United States; consumption approaches 1.5 quads/year of energy (1 quad = 1015 Btu) at a cost valued at nearly $10 billion annually. The US Department of Energy (DOE) Federal Energy Management Program (FEMP) supports efforts to reduce energy use and associated expenses in the Federal sector. One such effort, the New Technology Demonstration Program (NTDP), seeks to evaluate new energy-saving US technologies and secure their more timely adoption by the US government. Pacific Northwest Laboratory (PNL)is one of four DOE national multiprogram laboratories that participate in the NTDP by providing technical expertise and equipment to evaluate new, energy-saving technologies being studied and evaluated under that program. This two-volume report describes a field evaluation that PNL conducted for DOE/FEMP and the US Department of Defense (DoD) Strategic Environmental Research and Development Program (SERDP) to examine the performance of a candidate energy-saving technology -- a gas-engine-driven heat pump. The unit was installed at a single residence at Fort Sam Houston, a US Army base in San Antonio, Texas, and the performance was monitored under the NTDP. Participating in this effort under a Cooperative Research and Development Agreement (CRADA) were York International, the heat pump manufacturer, Gas Research Institute (GRI), the technology developer; City Public Service of San Antonio, the local utility; American Gas Cooling Center (AGCC); Fort Sam Houston; and PNL.

Book Studies on a Domestic Gas engine Driven Heat Pump

Download or read book Studies on a Domestic Gas engine Driven Heat Pump written by D. A. Clark and published by . This book was released on 1992 with total page 476 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Feasibility and Design Study of a Gas Engine Driven High Temperature Industrial Heat Pump

Download or read book Feasibility and Design Study of a Gas Engine Driven High Temperature Industrial Heat Pump written by D. B. A. Macmichael and published by . This book was released on 1978* with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Heat Pumps for Buildings

Download or read book Heat Pumps for Buildings written by A. F. C. Sherratt and published by . This book was released on 1984 with total page 384 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Field Comparison of Conventional HVAC Systems with a Residential Gas engine driven Heat Pump

Download or read book Field Comparison of Conventional HVAC Systems with a Residential Gas engine driven Heat Pump written by and published by . This book was released on 1994 with total page 19 pages. Available in PDF, EPUB and Kindle. Book excerpt: Through its Office of Federal Energy Management Program (FEMP), the US Department of Energy (DOE) provides technical and administrative support to federal agency programs directed at reducing energy consumption and cost in federal buildings and facilities. One such program is the New Technology Demonstration Program (NTDP). In this context, NTDP is a demonstration of a US energy-related technology at a federal site. Through a partnership with a federal site, the utility serving the site, a manufacturer of an energy-related technology, and other organizations associated with these interests, DOE can evaluate new technologies. The partnership of these interests is secured through a Cooperative Research and Development Agreement (CRADA). The Fort Sam Houston (San Antonio, Texas) NTDP is a field evaluation of a 3-ton gas-engine-driven residential heat pump. Details of the technical approach used in the evaluation, including instrumentation and methodology, are presented. Dynamic performance maps, based on field data, are developed for the existing residential furnaces and air conditioners at Fort Sam Houston. These maps are the basis for comparisons between the candidate and current equipment. The approach offers advantages over pre/post-measure evaluations by decoupling the measured equipment performance from the effects of different envelope characteristics, occupant behavior, and weather.

Book Energy Research Abstracts

Download or read book Energy Research Abstracts written by and published by . This book was released on 1993 with total page 754 pages. Available in PDF, EPUB and Kindle. Book excerpt: