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Experimental study on characteristics of a dual temperature control valve in the chilled water system of an air-conditioning unit
- Source :
- Energy and Buildings. 202:109369
- Publication Year :
- 2019
- Publisher :
- Elsevier BV, 2019.
-
Abstract
- The excess flow of water increases the energy consumption of water pumps in the chilled water systems of air-conditioning units. This paper proposes a strategy to control the chilled water flow rate of a fan coil unit (FCU) using a control valve. A physical simulation test bench was built to verify valve control and energy-saving effects. Results showed that the control valve could effectively regulate the flow rate of chilled water, improve the temperature difference (delta-T) between supply and return water, and reduce the energy consumption of the chilled water pump. With a supply water temperature of 7 C and low (325 m3⋅h−1), medium (500 m3⋅h−1), and high (600 m3⋅h−1) FCU air velocity levels, the average delta-T values were 4.79 °C, 4.39 °C, and 4.97 °C, respectively, and the energy consumption of the chilled water pump decreased by 12.20%, 11.31%, and 10.66%, respectively. With medium air velocity and supply water temperatures of 7 °C, 8 °C, and 9 °C, the average delta-T between supply and return water was 4.39 °C, 3.56 °C, and 3.33 °C, respectively, and the energy consumption of the chilled water pump decreased by 11.31%, 5.10%, and 7.80%, respectively. These research results provide useful insights in relation to the problem of excess chilled water flow identified above.
- Subjects :
- Control valves
Temperature control
Materials science
business.industry
020209 energy
Mechanical Engineering
Flow (psychology)
0211 other engineering and technologies
02 engineering and technology
Building and Construction
Energy consumption
Pulp and paper industry
Fan coil unit
Volumetric flow rate
Air conditioning
Chilled water
021105 building & construction
0202 electrical engineering, electronic engineering, information engineering
Electrical and Electronic Engineering
business
Civil and Structural Engineering
Subjects
Details
- ISSN :
- 03787788
- Volume :
- 202
- Database :
- OpenAIRE
- Journal :
- Energy and Buildings
- Accession number :
- edsair.doi...........ffe39e6a74af3e383792f57c617f1eee