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Title: A model to predict the latent capacity of air conditioners and heat pumps at part-load conditions with constant fan operation

Abstract

A model has been developed to predict the latent capacity of an air conditioner or heat pump at part-load conditions with a continuously operating supply fan. The model predicts the latent heat ratio (LHR) at part-load conditions as a function of the run-time fraction (X) or cooling-load fraction (CLF). The model parameters necessary to quantify system performance include the maximum cycling rate (N{sub max}), the air-conditioner time constant ({tau}), the ratio of the initial evaporation rate and steady-state latent capacity ({gamma}), the nominal time after start-up for condensate removal to begin (t{sub wet}), and the temperature and humidity entering the coil. The model compared favorably to measured data from Khattar et al. (1985). A sensitivity analysis was conducted to determine the model parameters that have the strongest impact on the part-load LHR. The model can be easily integrated into hourly building simulation models to more accurately predict the dehumidification performance of air conditioners at part-load conditions.

Authors:
 [1];  [2]
  1. CDH Energy Corp., Cazenovia, NY (United States)
  2. AJT and Associates, Inc., Cape Canaveral, FL (United States)
Publication Date:
OSTI Identifier:
392453
Report Number(s):
CONF-960254-
Journal ID: ISSN 0001-2505; TRN: IM9647%%307
Resource Type:
Book
Resource Relation:
Conference: Winter meeting of American Society of Heating, Refrigeration and Air Conditioning Engineers, Atlanta, GA (United States), 17-21 Feb 1996; Other Information: PBD: 1996; Related Information: Is Part Of ASHRAE transactions 1996: Technical and symposium papers. Volume 102, Part 1; PB: 1278 p.
Country of Publication:
United States
Language:
English
Subject:
32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION; AIR CONDITIONERS; MATHEMATICAL MODELS; CAPACITY; HEAT PUMPS; BLOWERS; COOLING LOAD; TEMPERATURE DEPENDENCE; HUMIDITY; THEORETICAL DATA

Citation Formats

Henderson, H I, and Rengarajan, K. A model to predict the latent capacity of air conditioners and heat pumps at part-load conditions with constant fan operation. United States: N. p., 1996. Web.
Henderson, H I, & Rengarajan, K. A model to predict the latent capacity of air conditioners and heat pumps at part-load conditions with constant fan operation. United States.
Henderson, H I, and Rengarajan, K. 1996. "A model to predict the latent capacity of air conditioners and heat pumps at part-load conditions with constant fan operation". United States.
@article{osti_392453,
title = {A model to predict the latent capacity of air conditioners and heat pumps at part-load conditions with constant fan operation},
author = {Henderson, H I and Rengarajan, K},
abstractNote = {A model has been developed to predict the latent capacity of an air conditioner or heat pump at part-load conditions with a continuously operating supply fan. The model predicts the latent heat ratio (LHR) at part-load conditions as a function of the run-time fraction (X) or cooling-load fraction (CLF). The model parameters necessary to quantify system performance include the maximum cycling rate (N{sub max}), the air-conditioner time constant ({tau}), the ratio of the initial evaporation rate and steady-state latent capacity ({gamma}), the nominal time after start-up for condensate removal to begin (t{sub wet}), and the temperature and humidity entering the coil. The model compared favorably to measured data from Khattar et al. (1985). A sensitivity analysis was conducted to determine the model parameters that have the strongest impact on the part-load LHR. The model can be easily integrated into hourly building simulation models to more accurately predict the dehumidification performance of air conditioners at part-load conditions.},
doi = {},
url = {https://www.osti.gov/biblio/392453}, journal = {},
issn = {0001-2505},
number = ,
volume = ,
place = {United States},
year = {Fri Nov 01 00:00:00 EST 1996},
month = {Fri Nov 01 00:00:00 EST 1996}
}

Book:
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