Development of a Aolar Intermittent Refrigeration System for Ice Production

This article is dedicated to the design, calculation and dimensioning of a small powered refrigeration system (132W) which produces ice bars (freezing) using solar thermal power, and resorts to an intermittent cycle absorption circuit with a water-ammonia mixture (H2O-NH3). The aim of this equipment is to minimize problems faced in places where there is no electric network to supply traditional refrigeration systems which preserve perishable products produced or stocked there, as well as drugs (vaccines), namely for specific regions of developing countries. The system developed can be divided into two parts. The intermittent cycle absorption refrigeration system uses a binary water-ammonia solution (H2O-NH3), where water is the absorber and the ammonia is the coolant and the thermal solar system. This is made up of CPC flat plate thermal collectors or vacuum tubes in which solar energy heats the water that circulates in the primary circuit. In the absorption circulation system, circulation occurs in a natural way due to the fluids affinity, and the temperature and pressure internal variations. This article shows the assumptions underlying the conception, calculation and dimensioning of the system’s construction.

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Evaluation of a solar intermittent refrigeration system for ice production operating with ammonia/lithium nitrate

Solar Energy ◽

10.1016/j.solener.2010.11.007 ◽

2011 ◽

Vol 85 (1) ◽

pp. 38-45 ◽

Cited By ~ 34

Author(s):

W. Rivera ◽

G. Moreno-Quintanar ◽

C.O. Rivera ◽

R. Best ◽

F. Martínez

Keyword(s):

Lithium Nitrate ◽

Refrigeration System ◽

Ice Production

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Experimental Investigation of the Performance and Energy Consumption of an Automated Ice-cube Making Machine

Journal of Engineering Research and Reports ◽

10.9734/jerr/2018/v3i116700 ◽

2018 ◽

pp. 1-12

Author(s):

Rasheed Ayofe Shittu ◽

Isaac Femi Titiladunayo

Keyword(s):

Energy Consumption ◽

System Performance ◽

Production Capacity ◽

Production Cycle ◽

Refrigeration System ◽

Ambient Conditions ◽

Harvesting Time ◽

Ice Cube ◽

Geographical Regions ◽

Ice Production

Aims: This study investigates the performance of a developed automated ice-cube making machine under controlled ambient conditions, in which its energy usage, rate of ice cube production and refrigeration system performance was analysed. Study Design: Average ambient temperatures of 24°C and 32°C were considered for investigation in order to determine their influence on ice production capacity, rate of ice-cube making and energy consumption. The choice of the ambient temperature is based on the extreme ambient conditions under which the machine is designed to operate in a wide range of geographical regions. The refrigeration system performance was carried out under normal room temperature (average of 23°C). Place and Duration of Study: Department of Mechanical Engineering, Federal University of Technology Akure, Ondo State Central Workshop, Between December 2017 and January 2018. Methodology: The machine was set into operation for 5 consecutive ice production cycle during which the ice making time, harvest time, quantity of ice produced and energy consumption were recorded. Results: The ice production capacity, harvesting time and energy consumption show various dissimilarities at both temperatures. 0.618 kg of ice cubes were produced within an ice making cycle of 34.9 minutes, harvesting time of 1.28 minutes and total energy consumption of 0.14053 kWh at 24°C while at 32°C, the machine produced an average of 0.612 kg ice cubes within an ice making cycle of 38.5 minutes harvesting time 1.21 minutes and energy consumption of 0.15947 kWh respectively. Consequently, 13.5% more energy is consumed, with about 1% less quantity of ice produced at 32°C than at 24°C per ice production cycle. Conclusion: Therefore, the ice making capacity of the developed machine suggests that the temperature of the environment has a strong influence on the energy consumption, but little effect on the quantity of ice produced per cycle. The refrigeration system cycle performance analysis results showed a considerably high cooling capacity of 0.379 kW during the ice-making cycle with a corresponding coefficient of performance (COP) of 2.23, and a heating capacity of 2.24 kW during the harvest cycle with a corresponding COP of 8.21. The results obtained showed that the machine is reliable in operation with minimal energy consumption.

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Second Law Analysis of a Refrigeration System for a Novel Semi-Closed Gas Turbine-Absorption Combined Cycle

Volume 3: Controls, Diagnostics and Instrumentation; Cycle Innovations; Marine ◽

10.1115/gt2010-23729 ◽

2010 ◽

Author(s):

ChoonJae Ryu ◽

William E. Lear ◽

S. A. Sherif

Keyword(s):

Gas Turbine ◽

Power Efficiency ◽

Energy System ◽

Combined Cycle ◽

Lapse Rate ◽

Refrigeration System ◽

Distributed Energy ◽

Distributed Energy System ◽

Load Leveling ◽

Ice Production

The Power, Water Extraction, and Refrigeration (PoWER) engine has been investigated for several years as a distributed energy system, among other applications, for civilian or military use. Previous literature describing its modeling and experimental demonstration have indicated several benefits, especially when the underlying semi-closed cycle gas turbine is combined with a vapor absorption refrigeration system, the PoWER system described herein. The benefits include increased efficiency, high part-power efficiency, small lapse rate, compactness, less emission, air, and exhaust flows (which decrease filtration and duct size) and condensation of fresh water. The present paper describes the preliminary design and modeling of a modified version of this system as applied to distributed energy, especially useful in regions which are prone to major grid interruptions due to hurricanes, under - capacity, or terrorism. In such cases, the distributed energy system should support most or all services within an isolated service island, including ice production, so that the influence of the power outage is limited in scope. This paper describes the rather straightforward system modifications necessary for ice production. The primary focus of the paper is the use of this ice-making capacity to achieve significant load-leveling during the summer utility peak, hence reducing the electrical capacity requirements for the grid as well as load-leveling strategies.

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