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You searched for subject:(Silicon expansion valve). Showing records 1 – 2 of 2 total matches.

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Texas A&M University

1. Gao, Kaimi. Experimental Evaluation of Silicon Expansion Valve Techonology.

Degree: 2015, Texas A&M University

Residential and commercial buildings consume 40% of the energy used in the United States. Heating and cooling uses more energy than any other system in a building. Typically, 43% of a building utility bill goes to HVAC equipment. By combining proper equipment maintenance and upgrades with appropriate insulation, air sealing, and thermostat settings, energy usage can be cut from 20% to 50%. In this research, advanced valves and control algorithms are studied to improve the efficiency and reduce the energy consumption of vapor compression air conditioning and refrigeration systems. The characteristics of the new generation of MEMS based flow control devices have been tested on single and multi-evaporator systems. This research conducted a comprehensive set of experimental tests that identify the most effective elements of an advanced valve control strategy under a variety of operating conditions. The performance of the new MEMS actuators with different control strategies is compared with the standard mechanical valves and a commercially available superheat controller. Preliminary research results reveal efficiency gains with a cascaded control algorithm over both the thermal expansion valves and the commercial superheat controller. Advisors/Committee Members: Rasmussen, Bryan P. (advisor), Annamalai, Kalyan (committee member), Huang, Garng M. (committee member).

Subjects/Keywords: HVAC&R; Silicon expansion valve; control

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Gao, K. (2015). Experimental Evaluation of Silicon Expansion Valve Techonology. (Thesis). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/155657

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16th Edition):

Gao, Kaimi. “Experimental Evaluation of Silicon Expansion Valve Techonology.” 2015. Thesis, Texas A&M University. Accessed July 19, 2019. http://hdl.handle.net/1969.1/155657.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7th Edition):

Gao, Kaimi. “Experimental Evaluation of Silicon Expansion Valve Techonology.” 2015. Web. 19 Jul 2019.

Vancouver:

Gao K. Experimental Evaluation of Silicon Expansion Valve Techonology. [Internet] [Thesis]. Texas A&M University; 2015. [cited 2019 Jul 19]. Available from: http://hdl.handle.net/1969.1/155657.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Gao K. Experimental Evaluation of Silicon Expansion Valve Techonology. [Thesis]. Texas A&M University; 2015. Available from: http://hdl.handle.net/1969.1/155657

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation


Texas A&M University

2. Gupta, Ankush 1986-. Dynamic Modeling and Cascaded Control for a Multi-Evaporator Supermarket Refrigeration System.

Degree: 2012, Texas A&M University

The survey from US Department of Energy showed that about one-third of energy consumption in US is due to air conditioning and refrigeration systems. This significant usage of electricity in the HVAC industry has prompted researchers to develop dynamic models for the HVAC components, which leads to implementation of better control and optimization techniques. In this research, efforts are made to model a multi-evaporator system. A novel dynamic modeling technique is proposed based on moving boundary method, which can be generalized for any number of evaporators in a vapor compression cycle. The models were validated experimentally on a commercial supermarket refrigeration unit. Simulation results showed that the models capture the major dynamics of the system in both the steady state and transient external disturbances. Furthermore the use of MEMS (microelectromechanical) based Silicon Expansion Valves (SEVs) have reportedly shown power savings as compared to the Thermal Expansion Valves (TEVs). Experimental tests were conducted on a supermarket refrigeration unit fitted with the MEMS valves to explain the cause of these potential energy savings. In this study an advanced cascaded control algorithm was also designed to control the MEMS valves. The performance of the cascaded control architecture was compared with the standard Thermal Expansion Valves (TEVs) and a commercially available Microstaq (MS) Superheat Controller (SHC). The results reveal that the significant efficiency gains derived on the SEVs are due to better superheat regulation, tighter superheat control and superior cooling effects in shorter time period which reduces the total run-time of the compressor. It was also observed that the duty cycle was least for the cascaded control algorithm. The reduction in duty cycle indicates early shut-off for the compressor resulting in maximum power savings for the cascaded control, followed by the Microstaq controller and then the Thermal Expansion Valves. Advisors/Committee Members: Rasmussen, Bryan (advisor), Pate, Michael (committee member), Haberl, Jeff (committee member).

Subjects/Keywords: Cascaded Control; Silicon Expansion Valve; Dynamic Modeling

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Gupta, A. 1. (2012). Dynamic Modeling and Cascaded Control for a Multi-Evaporator Supermarket Refrigeration System. (Thesis). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/148111

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16th Edition):

Gupta, Ankush 1986-. “Dynamic Modeling and Cascaded Control for a Multi-Evaporator Supermarket Refrigeration System.” 2012. Thesis, Texas A&M University. Accessed July 19, 2019. http://hdl.handle.net/1969.1/148111.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7th Edition):

Gupta, Ankush 1986-. “Dynamic Modeling and Cascaded Control for a Multi-Evaporator Supermarket Refrigeration System.” 2012. Web. 19 Jul 2019.

Vancouver:

Gupta A1. Dynamic Modeling and Cascaded Control for a Multi-Evaporator Supermarket Refrigeration System. [Internet] [Thesis]. Texas A&M University; 2012. [cited 2019 Jul 19]. Available from: http://hdl.handle.net/1969.1/148111.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Gupta A1. Dynamic Modeling and Cascaded Control for a Multi-Evaporator Supermarket Refrigeration System. [Thesis]. Texas A&M University; 2012. Available from: http://hdl.handle.net/1969.1/148111

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

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