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  • Articles  (4)
  • Latest Papers from Table of Contents or Articles in Press  (4)
  • Energy efficiency improvement  (4)
  • Energy, Environment Protection, Nuclear Power Engineering  (4)
  • Process Engineering, Biotechnology, Nutrition Technology
  • 1
    Publication Date: 2016-02-05
    Description: Academic and industrial literature concerning the energy use of commercial kitchens is scarce. Electricity consumption data were collected from distribution board current transformers in a sample of fourteen UK public house-restaurants. This was set up to identify patterns of appliance use as well as to assess the total energy consumption of these establishments. The electricity consumption in the selected commercial kitchens was significantly higher than current literature estimates. On average, 63% of the premises' electricity consumption was attributed to the catering activity. Key appliances that contributed to the samples’ average daily electricity consumption of the kitchen were identified as refrigeration (70 kWh, 41%), fryers (11 kWh, 13%), combination ovens (35 kWh, 12%), bain maries (27 kWh, 9%) and grills (37 kWh, 12%). Behavioural factors and poor maintenance were identified as major contributors to excessive electricity usage with potential savings of 70 and 45%, respectively. Initiatives are required to influence operator behaviour, such as the expansion of mandatory energy labelling, improved feedback information and the use of behaviour change campaigns. Strict maintenance protocols and more appropriate sizing of refrigeration would be of great benefit to energy reduction.
    Keywords: Energy efficiency improvement
    Print ISSN: 1748-1317
    Electronic ISSN: 1748-1325
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
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  • 2
    Publication Date: 2015-11-07
    Description: In order to analyze the way of improving the cooling effect of the data center with the UFAD system, the HVAC simulation software—Airpak—was applied. Numerical simulations for the interior temperature of the rack at different porosity ratios were carried out, and the simulated results indicate that the way of partly enhancing the porosity ratio of the front door and back door can improve the cooling effect. To solve the issue of the thermal current recycle in the exhaust outlet and airflow distribution disorder, the measure of the cold aisle regional closure was taken, and the comparison of data before and after the closure of the cold aisle proved its positive influence on the cooling effect: to lowering the inlet air temperature of racks, to improve airflow distribution inside and outside of the rack and to solve the thermal current recycle in the exhaust outlet.
    Keywords: Energy efficiency improvement
    Print ISSN: 1748-1317
    Electronic ISSN: 1748-1325
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
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  • 3
    Publication Date: 2016-02-05
    Description: Currently used central heating systems utilise radiators operating on constant flow with on/off control strategy that consumes significant amount of energy. Therefore, enhancing the thermal performance of central heating systems can play a major role in reducing buildings’ energy consumption. This work aims to improve the performance of hot water heating system by changing the radiator inlet flow strategy from constant to pulsed flow without changing the installed radiator or compromising the user comfort. Using the Simulink/Matlab software, a mathematical model of a room with single radiator was developed. This model couples the thermal performance of the radiator, air within the heated space, walls and windows. Pulsed flow with amplitudes ranging from 0.024 to 0.048 kg/s, frequencies ranging from 0.0017 to 0.017 Hz and duty cycles ranging from 50 to 80% were investigated and compared with the constant flow. Results showed that up to 22% of the energy consumed for heating can be saved by changing the constant flow to pulsed flow. In addition to the energy saving achieved using this pulsed flow, the indoor temperature response is also shortened from 600 s for the constant flow case to 450 s. Further improvement was achieved by introducing the proportional integral differential (PID) control system with the pulsed flow where the results showed that the fluctuation in the indoor temperature decreased to ±1 K of the desired temperature of 20°C and energy saving can be increased to 27%.
    Keywords: Energy efficiency improvement
    Print ISSN: 1748-1317
    Electronic ISSN: 1748-1325
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
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  • 4
    Publication Date: 2014-05-15
    Description: A physical and mathematical model is established to simulate a single droplet impact onto a thin horizontal liquid film by using coupled Level Set and volume of fluid method, which has advantages in acquisition of interface geometrical parameters and keeping mass conservation. The evolution after the droplet impact is obtained together with isopiestic and velocity field at different parameters including impact velocity, droplet diameter and liquid film thickness. Influences of Weber number (We number), droplet size and film thickness on the crown diameter and crown height are acquired, and the results indicate that the crown diameter and height could be increased by increasing We number or by reducing film thickness. Furthermore, bubble entrainment phenomenon when the droplet impinges the liquid film are captured successfully and discussed. It is found that increment of both impact We number and droplet diameter could help the emerging of bubble rings.
    Keywords: Energy efficiency improvement
    Print ISSN: 1748-1317
    Electronic ISSN: 1748-1325
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Location Call Number Expected Availability
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