Experimental verification of suitability of insulation testing rig in determining thermophysical properties of insulating materials

Nnamchi, Stephen Ndubuisi; Nnamchi, Onyinyechi Adanma; Odebiyi, Oluwasegun Samuel; Edosa, O. O.; Wanazusi, Titus

doi:10.1080/23311916.2019.1657264

Cited by 8 publications

(3 citation statements)

References 12 publications

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“…The end user of the application appreciates it as it made shopping easier compared to manual shopping and web-based system [13][14][15][16][17][18][19][20][21].…”

Section: Discussionmentioning

confidence: 99%

An Online Mobile Shopping Application for Uchumi Supermarket in Uganda

James¹

2023

IDOSR JST

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Supermarkets in Uganda simplify the life of many Ugandans by providing easy and quick shopping day and night; some even operate 24 hours a day. This has prompted the supermarkets in Uganda to provide and improve shopping. The purpose of the study was to design an online mobile shopping application that is used by people to shop using their mobile phones at any time of their convenience. The online mobile application was designed to focus on improving shopping services to avoid congestion in supermarkets in Uganda. Uchumi supermarket Kabalagala branch was taken as a case study where both the user and the clients were interviewed for the purpose of requirement elicitation. The online mobile shopping application system at Uchumi supermarket in Uganda has been designed to work with the Information technology unit or department (IT) to manage clients’ accounts and details, and the databases of the supermarket. Operating system (xp service pack 2 onwards) DBMS that will manage the database activities. Php and Java, to allow program access to data in the database. Keywords: Supermarkets, Quick shopping, Mobile phones, Mobile shopping, Information technology.

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“…The end user of the application appreciates it as it made shopping easier compared to manual shopping and web-based system [13][14][15][16][17][18][19][20][21].…”

Section: Discussionmentioning

confidence: 99%

An Online Mobile Shopping Application for Uchumi Supermarket in Uganda

James¹

2023

IDOSR JST

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“…[10], conducted experimental investigations using a vapor compression device and R1234yf has a cooling capacity approximately 9% less than R134a. [14][15][16][17][18][19], conducted an experimental study on a variable displacement compressorequipped automobile air conditioning system and found that R1234yf systems perform less well than R134a systems when cooling capacity is same. [11], conducted a quick performance comparison of R1234yf and R134a in a vehicle bench tester and concluded that R1234yf had a poorer coefficient of performance and cooling capacity than R134a by 2.7 percent and 4%, respectively.…”

Section: Introductionmentioning

confidence: 99%

Modeling of the Operational Parameters on the Performance of an Air Conditioning System

Sangotayo¹,

Nnamchi²,

Mundu³

2023

IDOSR JES

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Heat and moisture are removed from occupied spaces by air conditioning systems. Air conditioners regulate moisture and temperature, and improve air quality. Human efficiency is dramatically boosted and worker's efficiency is affected by their work environment. Human being is more comfortable and productive with air conditioning. After a few years of excellent operation, the system began to fail, resulting in numerous resident complaints. The goal of this study is to establish operational characteristic models for an air conditioning system's performance in order to fulfill future client requirements. The inlet and output temperatures as a function of local time were measured for the LSBLG 1200/MCF model central water chiller air conditioning system. The COP and EER curves were examined. MiniTAB 16.0 was used to establish the characteristic curves and models, according to the findings. The regression models are statistically significant at 97.7 percent and 91.1 percent for p-value less than 0.05 and R2 , respectively. The COP and EER values were calculated, and it was determined that the best cooling occurred between 1 and 3 p.m. The chiller and cooling tower achieve maximum coefficients of performance (COP) of 52 and 20, respectively. The chiller and cooling tower have EER ratings of 177 and 68, respectively. Regression analysis is used to develop models that characterize the statistical relationship between operational parameters such as input and outlet temperatures as a function of local time and response variables such as COP and EER. The performance of the system can be monitored using existing models. Keywords: Modeling, operational parameters, performance, and air conditioning system.

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“…Conspicuously, very few designs have made the thermal coefficients and the heat transfer fluid (HTF) properties to be temperature sensitive [11][12][13]. This is vital for direct optimization of the exit fluid temperature, which is an important aspect of this work.…”

Section: Introductionmentioning

confidence: 99%

Design and Simulation of Air-Solar Preheating Unit: An Improved Design of a Flat Plate Solar Collector

Nnamchi

Sangotayo

et al. 2020

IJEE

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The design of a flat-plate solar collector (FPSC) is accomplished by multiple input multiple output (MIMO) design technique. The design variables (absorber, fluid and glass temperatures; length, width, height of the FPSC) were the unknown variables in the commensurate thermal balance equations based on; component, overall and yardstick thermal balance on the FPSC. Then, simulator matrices were setup comprising of coefficient and column matrices of design functions. The elements of the coefficient matrix were the partial derivatives of the design functions with respect to the design variables. Besides the convective and radiative heat transfer coefficients were function of the design variables. The initial values of the design variables (307K, 334.5K, 368K, 2 m, 1 m, and 0.045m, respectively) were set, at the seventh iteration, the output variables (306.9K, 339.15K, 368.1K, 2.01m, 1.005m, 0.04m, respectively) merged as the design functions → 0 with insignificant change in the design variables. The output results were used to simulate FPSC, to track its responses to changes in the physical conditions, the stimulation revealed some constraints in the design of the FPSC, which is vital information for the overall optimization of the FPSC. The design yardsticks; the thermal efficiency (0.76) and the effectiveness (0.4) are quite pragmatic. This shows that MIMO technique to thermal system design is effective as convergence among the design variables was sought. Moreover, MIMO considered all thermal losses instead of basing the yardsticks on top loss overall transfer coefficient alone; thus, neglecting sidewalls and base losses. Moreover, the advent of connecting box prepares the preheating unit for high temperature drying (> 150 o C) on integration with a reheating unit.

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Experimental verification of suitability of insulation testing rig in determining thermophysical properties of insulating materials

Cited by 8 publications

References 12 publications

An Online Mobile Shopping Application for Uchumi Supermarket in Uganda

An Online Mobile Shopping Application for Uchumi Supermarket in Uganda

Modeling of the Operational Parameters on the Performance of an Air Conditioning System

Design and Simulation of Air-Solar Preheating Unit: An Improved Design of a Flat Plate Solar Collector

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