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Title: Temperature Measurements on Operating Heat Pumps


No abstract prepared.

  1. ORNL
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:
DOE Contract Number:
Resource Type:
Resource Relation:
Conference: 52nd International Instrumentation Symposium, Cleveland, OH, USA, 20060507, 20060511
Country of Publication:
United States

Citation Formats

Allison, Stephen W. Temperature Measurements on Operating Heat Pumps. United States: N. p., 2006. Web.
Allison, Stephen W. Temperature Measurements on Operating Heat Pumps. United States.
Allison, Stephen W. Sun . "Temperature Measurements on Operating Heat Pumps". United States. doi:.
title = {Temperature Measurements on Operating Heat Pumps},
author = {Allison, Stephen W},
abstractNote = {No abstract prepared.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Sun Jan 01 00:00:00 EST 2006},
month = {Sun Jan 01 00:00:00 EST 2006}

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  • The Carnot coefficient of performance (CCOP) expression for heat pumps operating between four temperature levels is developed from first principles. The four temperature expressions may be used whenever the components are all at different temperatures. The derived Carnot COP expressions for four discrete temperatures become identical to the published ones representing three discrete temperatures when the two intermediate temperatures coalesce into a single value, thereby validating the result. A heuristic approach is then adopted to analyze some of the possible consequences of four-temperature cycles, especially regarding improvements in temperature lift and boost.
  • There are many ground-source heat pump (GSHP) installations in commercial and institutional buildings in the US and Canada, but little information is available about their merits, design details, ground heat exchanger design and sizing, integration with traditional buildings systems, and performance. ASHRAE RP-863 is gathering, analyzing, and documenting information on such installations that should be useful for consulting engineers who wish to consider GSHP systems for their clients. The information being gathered includes descriptions of buildings and systems, project costs, system performance, operating difficulties, and owner satisfaction. The information was obtained through direct telephone contact with different individuals and organizationsmore » at each site and supplemented with published literature where available. This part describes results from 12 of the case studies under preparation.« less
  • Three public-domain computer simulation models, PUREZ, HPSIM, and ACMODEL were evaluated in their ability to predict the dehumidification performance of four air-conditioning systems operating over a wide range of conditions. Based on the results, the most accurate model was selected for simulations of four additional air-conditioning systems. PUREZ was found to give the closest agreement to the measured dehumidification performance of the initial four units, and the additional analyses showed that its predictions of total, latent, and sensible cooling capacity are nearly within the uncertainties of the laboratory measurements. In general PUREZ and HPSIM overpredicted the sensible heat ratio, ACMODELmore » was able to accurately predict total capacity; however, it overpredicted latent capacity and underpredicted sensible capacity.« less
  • A large research program in the field of solar-coupled heat pumps with seasonal storage in the ground, using vertical pipes to a depth of 10-40 m has been going on for several years in Sweden. In this paper, some main results from two experimental plants are presented. As well, results from a technical-economic optimization study are discussed. In these calculations, comparisons are made among systems using ambient-air natural convection heat exchangers, low-temperature solar collectors, and ''conventional'' ambient-air heat pumps without storage. One of the experimental plants heats a school and consists of low-temperature solar collectors on the roof, four diesel-drivenmore » heat pumps, and a storage system with vertical pipes in clay, depth 35 m. Seasonal performance factors (SPF's) are 3.6 (heat pumps) and 1.7 (total system). The other plant is an experimental one for a single-family house with an electrically driven heat pump, natural convection heat exchangers on the roof, and a storage system in clay, depth 10 m. Annual SPF's are 3.0 (heat pump) and 2.5 (including all auxiliary electricity consumption). Systems evaluation calculations indicate optimal sizes of the three main components, although the optimas are flat. The difference in economy between systems with solar collectors and with natural convection heat exchangers are small. However, systems with solar or ambient-air heat collectors and storage systems cannot today compete economically with ambient-air heat pumps without storage systems, at least if Swedish conditions are assumed.« less
  • The present study has resulted in a conceptual design of the heat pump system providing the information needed for the detailed design and construction of a laboratory working system. The basic cycle was studied for use with low-temperature waste heat (60/sup 0/C). Multistaging of the heat pump was investigated for increased temperature boosting and a preferred two-stage configuration was identified. Open cycle evaporation and desorption was considered for cases of low temperature differential between the heat source and sink. Suitable working materials were considered and components performance was analyzed at the conceptual design level. The overall system performance was studiedmore » for varying operating conditions. Several improvements in the cycle were considered. A complete computer model of the system was developed to perform the study. The code is available for investigation of different configurations and operating conditions, and will be used in the detailed design of the laboratory system. Technical accomplishments are summarized.« less