Instrumentation for Performance Measurements of Heat Pumps With Commercial Desuperheaters

2010 ◽  
Author(s):  
Emin Yilmaz
Keyword(s):  
Heat Transfer ◽  
Data Acquisition ◽  
Water Temperature ◽  
Heat Pump ◽  
Ambient Air ◽  
Data Acquisition System ◽  
Acquisition System ◽  
Computer Data ◽  
Computer Data Acquisition ◽  
Heating Mode

The current project is an extension of the original “ETME 475-Mechanical Systems Design” course project with a new National Instruments data acquisition board, a newly developed LabVIEW data acquisition program, and with a more realistic heat transfer loop. The study covers performance of our heat pump operating in A/C mode as well as in heating mode with a commercial desuperheater (a cross-flow heat exchanger). For this project, the experimental set up consisted of a desuperheater spliced into Trane XL1000, 2-ton, 10-SEER heat pump and a heat transfer loop with a 72-liter hot water storage tank. The instrumentation consisted of seven copper-constantan thermocouples and a LabVIEW-based computer data acquisition system. The thermocouples were used to measure refrigerant, water, indoor air and ambient air temperatures. The LabVIEW based computer data acquisition system was used to record temperatures. Indoor airflow rate was previously measured using Alnor LoFlo balometer. Results indicate that, depending on the water temperature in the desuperheater, heat pump Coefficient of Performance (COP) dropped 6–18% in A/C mode and 8–38% in heating mode. Again depending on the average water temperature in the desuperheater, the desuperheater efficiencies ranged from 12% to 27% for cooling and 11% to 39% for heating. Although even modifying an existing LabVIEW program was a challenge, the student who worked on it and the author has gained very valuable experience and enjoyed the work.

scholarly journals Control and data acquisition system for the rolling machine

2019 ◽  
Vol 252 ◽  
pp. 06001
Author(s):  
Andrzej Sumorek ◽  
Marcin Buczaj
Keyword(s):  
Data Acquisition ◽  
Data Acquisition System ◽  
Rolling Process ◽  
Acquisition System ◽  
Main Task ◽  
Data Systems ◽  
Computer Data ◽  
Flexible Control ◽  
Computer Data Acquisition ◽  
Data Application

Rolling machines are often used for forming flat elements or pipes. Problems occur when used to produce cylindrical elements other than pipes, or when experimental materials are used. It is required to introduce flexible control of the rolling process parameters in such cases. It is necessary to monitor the device operating parameters. When a rolling machine works with experimental materials, there are no typical control and acquisition data systems available. The article presents the concept and capabilities of the control and computer data acquisition system supporting the rolling process. The main task of software system is acquisition of force and kinetic parameters related to the analysed process of the compression during rolling. This system allows current recording and analysis of five physical values. The acquisition data application is developed in National Instruments LabVIEW environment. The software algorithm is based on the state machine. The article contains a detailed description of hardware and software implementation of the functions mentioned.

Computer Data Acquisition System for the Sandia Four-Beam Laser

1975 ◽  
Vol 22 (1) ◽  
pp. 547-550
Author(s):  
W. B. Boyer ◽  
R. F. Davis ◽  
J. L. Krone ◽  
J. E. Powell
Keyword(s):  
Data Acquisition ◽  
Data Acquisition System ◽  
Acquisition System ◽  
Computer Data ◽  
Beam Laser ◽  
Computer Data Acquisition

LabVIEW and Measure Foundry Based Data Acquisition System for Mechanical Engineering Technology Laboratories

2013 ◽  
Author(s):  
Emin Yilmaz
Keyword(s):  
Data Acquisition ◽  
Tensile Testing ◽  
Mechanical Engineering ◽  
Data Acquisition System ◽  
Acquisition System ◽  
Materials Testing ◽  
Engineering Technology ◽  
Computer Data ◽  
Data Translation ◽  
Application Programs

Since the ASYST data acquisition and analysis software was discontinued and the old versions of ASYST do not support new computer operating systems and new data acquisition boards, old computer data acquisition (CDAQ) system is being replaced with a new data acquisition system. The new microcomputer based data acquisition system consists of an i-3 microcomputer with 3.0 GHz CPU and Windows-7 operating system, a Data Translation (DT) DT-304, 12-bit, 400 MHz data acquisition board with STP-300 screw terminal, Data Translation Measure Foundry (DT-MF) software and DT-LV link software [2], a National Instruments (NI) PCI-6250, M-series, low level, 16-bit, 1.25 MS/s board with 4-module SCC-68 I/O Connector Block, four thermocouple-input plug-in modules and NI LabVIEW (NI-LV) software [4]. Data Translation’s DT-LV software links DT boards with NI-LV software. Most ASYST-based data acquisition and analysis application programs used in Mechanical Engineering Technology (MET) courses have been converted to NI-LV and DT-MF application programs. Purpose of this paper is to describe how our old data acquisition application programs were converted to new data acquisition application programs so that they may be used with our new data acquisition system. Descriptions of the experiments, equipment used, and experiences gained with laboratory experiments are given elsewhere [8–13]. Specifically: Reference [8] covers upgrades made to the Materials Testing Laboratory, including Tinius-Olsen [14] tensile testing machine; reference [9] covers design and development of data acquisition programs for the materials testing, including Tensile Testing of Materials experiment; references [11] and [12] cover Heating Ventilating and Air Conditioning (HVAC) experiments and use of DAQ system in these experiments; reference [13] cover all uses of DAQ system in MET at University of Maryland Eastern Shore (UMES).

Performance of Air Conditioners With Commercial Desuperheaters: A Green Energy Project as an Undergraduate Research

2009 ◽  
Author(s):  
Emin Yilmaz ◽  
Abhijit Nagchaudhuri
Keyword(s):  
Data Acquisition ◽  
Water Temperature ◽  
Heat Pump ◽  
Waste Heat ◽  
Mechanical Systems ◽  
Green Energy ◽  
Hot Water ◽  
Coefficient Of Performance ◽  
Design Project ◽  
Heating Mode

The goal of the design project titled “Domestic Hot Water Heater Using Air Conditioner Waste Heat” was to introduce students to designing mechanical systems in the “ETME475-Mechanical Systems Design” course. Two students completed the design project in spring 2007. Some test runs were conducted with a commercial desuperheater to measure the efficiency of the unit and its effect on the Coefficient of Performance (COP) of the Heat Pump when the heat pump is operated in air conditioning (A/C) mode. Contrary to author’s expectations, results indicated that, COP values were reduced by about 22%. Measured efficiency of the desuperheater was about 18% [1]. The current project is an extension of the original project with the new National Instruments data acquisition board, a newly developed LabVIEW data acquisition program, and with a more realistic heat transfer loop. The study covers performance of the heat pump operating in A/C mode as well as in heating mode. Results indicate, depending on the water temperature in the desuperheater, heat pump COP dropped 6–17% in A/C mode and 8–38% in heating mode. Again depending on the average water temperature in the ECU, the ECU efficiencies ranged from 12% to 27% for cooling and 11% to 39% for heating.

scholarly journals Low-Level Liquid Scintillation Counter Array with Computerized Data Acquisition and Age Calculation Capabilities for 14C Dating

Radiocarbon ◽  
1995 ◽  
Vol 37 (2) ◽  
pp. 773-779
Author(s):  
J. E. Noakes ◽  
J. D. Spaulding ◽  
R. J. Valenta
Keyword(s):  
Data Acquisition ◽  
Liquid Scintillation ◽  
Scintillation Counter ◽  
Data Acquisition System ◽  
Age Dating ◽  
Acquisition System ◽  
Liquid Scintillation Counter ◽  
Computer Data ◽  
Background Reduction ◽  
Electronic Signal

We describe a two-phase study directed toward background reduction of a manual liquid scintillation counter and the interfacing of electronics for counting to a computer data acquisition system. Counter background reduction is achieved with afterpulse electronics, a high-performance cocktail, an auxiliary detector/guard and a special sample vial holder. The data acquisition system is comprised of an electronic signal processor and sorter for operating up to eight counters simultaneously and interfacing to a computer with software for data storage, acquisitions and age dating calculations. We discuss low-background counter modifications, electronic signal processing and computer software for 14C age dating.

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