Research Papers

Energy Analysis and Optimization of a Water-Loop Heat Pump System

[+] Author and Article Information
Shui Yuan1

 United Technologies Research Center, MS129-85, 411 Silver Lane, East Hartford, CT 06108yuanshui@gmail.com

Michel Grabon

 Carrier Corporation, Route de Thil, 01122 Montluel, Francemichel.grabon@carrier.utc.com


Corresponding author.

J. Thermal Sci. Eng. Appl 2(2), 021005 (Oct 21, 2010) (8 pages) doi:10.1115/1.4002591 History: Received April 29, 2010; Revised September 20, 2010; Published October 21, 2010; Online October 21, 2010

A water-loop heat pump system consists of a set of water-source heat pumps that are connected with a closed-loop water network, which allows heat to be injected into or extracted out of the loop water. Such a configuration is able to meet simultaneous heating and cooling demands with a heat recovery capability. This paper analyzes the impact of loop water temperature on energy performance of individual heat pumps and the whole system, demonstrates that there exists a unique loop water temperature that minimizes overall power consumption of the configuration under discussion, and proposes a strategy to find the optimal temperature, which can be implemented in a real-time application. Simulations have been conducted to verify that a significant energy savings can be achieved over conventional practice.

Copyright © 2010 by American Society of Mechanical Engineers
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Figure 1

Schematic of a WHLP system

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Figure 2

Configuration of the studied WHLP system

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Figure 3

Definitions of temperatures and water mass flow rate

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Figure 4

Power of water-to-water heat pump in cooling versus EWTs

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Figure 5

Power of water-to-water heat pump in heating versus EWTs

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Figure 9

Performance comparison between hour 2888 and 2891

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Figure 8

Definitions of variables in Golden Section Search algorithm

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Figure 7

Power of air-source heat pump in heating versus LWTl

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Figure 6

Power of air-source heat pump in cooling versus LWTl



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