The Experts below are selected from a list of 186 Experts worldwide ranked by ideXlab platform

I E Lane - One of the best experts on this subject based on the ideXlab platform.

  • the multi objective controller a novel approach to domestic Hot Water Load control
    IEEE Transactions on Power Systems, 1996
    Co-Authors: B Rautenbach, I E Lane
    Abstract:

    The multi-objective controller provides a new method in controlling the domestic Hot Water Load. Not only does it aim to reduce the peak system demand, but it also tries to minimise discomfort to the end-user and reduce his electricity bill. This is done by controlling blocks of households with similar energy usage patterns uniquely, and responding to a time-differentiated tariff structure for the domestic sector. Results show how the system peak Load is reduced due to control, and how end-users save on their electricity bills with minimum discomfort to them. The optimisation method used for this control strategy can also serve as a Load forecast and planning tool. Different scenarios can be simulated and the results compared to find optimal solutions for specific control areas.

  • a model of the domestic Hot Water Load
    IEEE Transactions on Power Systems, 1996
    Co-Authors: I E Lane, N Beute
    Abstract:

    The electrical Load required to supply domestic Hot Water is an important Load for two reasons: (1) it represents a large portion (30 to 50%) of the domestic Load; and (2) it is a Load which can easily be controlled by the consumer or the supplier, because the use of the Hot Water need not coincide with the heating of Hot Water. A model representing the power system Load due to Hot Water consumption from storage Water heaters is provided. Variable parameters include the average amount of Water used, the mean and deviation of distributions of usage times, thermostat settings, inlet Water temperature and electrical heating element ratings. These parameters are used to estimate the after diversity electricity demand profile, and were verified for accuracy by comparison with measurements. This model enables the prediction of the effects of Load control, examples of which are given in this paper. The model is also useful for evaluation of the response which could be expected from demand-side management options. These include changing the size of heating elements, reduction in Water consumption and reduction in thermostat settings.

Adnan Shariah - One of the best experts on this subject based on the ideXlab platform.

  • Optimizing the tilt angle of solar collectors
    Renewable Energy, 2002
    Co-Authors: Adnan Shariah, M-ali Al-akhras, I. A. Al-omari
    Abstract:

    Solar collectors need to be tilted at the correct angle to maximize the performance of the system. In this paper, the annual solar fraction of the system (the fraction of energy that is supplied by solar energy) is used as an indicator to find the optimum inclination angles for a thermosyphon solar Water heater installed in northern and southern parts of Jordan. Calculations are carried out using the powerful computer program TRNSYS (Transient System Simulation). The system is assumed to operate with a daily Hot Water Load of 150 l at 55°C flowing during the day according to the widely used Rand consumption profile. The results show that the optimum inclination angle for the maximum solar fraction is about φ+(0→10°) for the northern region (represented by Amman) and about φ+(0→20°) for the southern region (represented by the town of Aqaba). These values are greater than those for maximum solar radiation (which is commonly used as an indicator) at the top of the collector by about 5 to 8°.

  • Technical note Best connection scheme of collector modules of thermosyphon solar Water heater operated at high temperatures
    Renewable Energy, 1999
    Co-Authors: Adnan Shariah, Deifallah Dajeh, Nabil B. Malhi
    Abstract:

    Large scale thermosyphon solar Water heater for high temperature applications is simulated by the use of the Transient Simulation Program (TRNSYS). A daily Hot Water Load of 1500 l/day and 2500 l/day at 80°C was assumed. The Hot Water is consumed daily from 08·00–17·00 h. A back-up electric auxiliary heater was added to the system in two schemes: first, located inside the storage tank with a thermostat; second, outside the tank connected to the heating system between the tank and the facilities. The collector modules were connected in five different schemes: first, all collectors were connected in series in one line, or collectors were connected in two, three, four or five parallel lines each consisting of many collectors. The results showed that the best connection is when the 20 collectors, comprising the system, are connected in two parallel lines each consisting of 10 collectors. It was found that the monthly and yearly useful energy from the system was higher when the auxiliary Water heater was added to the system outside the storage tank.

  • The optimization of tank-volume-to-collector-area ratio for a thermosyphon solar Water heater
    Renewable Energy, 1996
    Co-Authors: Adnan Shariah
    Abstract:

    Through the use of the TRNSYS simulation program, the performance of a domestic solar Water heating system operating with natural circulation (thermosyphon) and a daily Hot Water Load has been analysed. The effect of tank height on the annual solar fraction of the system has been investigated for different Hot Water Load temperatures and storage tank volumes. Optimum values (values which maximize the annual solar fraction of the system) for storage tank height and volume are calculated for operating temperatures ranging from 50 to 80°C. The response of the system to the ratio of the storage tank volume to the collector area is investigated. The dependence of the solar fraction on tank height was observed to be more notable in the case of large tank volumes and high Load temperatures. The results indicate the existence of an optimum value for the tank volume at a given tank height and a high Load temperature. At lower temperatures, the solar fraction rises rapidly with tank volume to a nearly constant level. An optimum value of the storage-tank-volume-to-collector-area ratio was also observed at high Load temperatures.

  • effect of Hot Water Load temperature on the performance of a thermosyphon solar Water heater with auxiliary electric heater
    Energy Conversion and Management, 1995
    Co-Authors: Adnan Shariah, A Ecevit
    Abstract:

    A thermosyphon solar Water heating system with an in-tank auxiliary electric heater has been simulated for different Hot Water Load temperatures using the TRNSYS simulation program. The results of the simulation show that the annual efficiency and solar fraction are functions of the Hot Water Load temperatures. The effect of Load temperature on the solar fraction is found to be very large when the daily Load volume (the volume of Hot Water delivered to Load) to collector area ratio is large. The influence of storage tank volume to collector area ratio on the efficiency of the collector is observed only when this ratio is less than or equal to 40 1 m2 for all collector areas and Load temperatures studied. Generally, the annual average storage tank temperature depends on the Load temperature and had lower values for high Load temperatures. The response of the system performance to the area of the collector is found to be very large when the system operates with a solar fraction below 70%.

David Fischer - One of the best experts on this subject based on the ideXlab platform.

  • a stochastic bottom up model for space heating and domestic Hot Water Load profiles for german households
    Energy and Buildings, 2016
    Co-Authors: David Fischer, Tobias Wolf, Johannes Scherer, Bernhard Willehaussmann
    Abstract:

    Abstract In 2013 83% of energy in the German residential sector is used for the preparation of domestic Hot Water (13%) and space heating (70%). Thermal demand profiles are essential to correctly determine operation and sizing of heating technologies. In this work, the stochastic bottom-up approach for electric Loads is extended to cover domestic Hot Water (DHW) and space heating demands. The approach is presented for individual buildings and residential areas, validated and compared to currently used approaches. A behavioural model is used to determine DHW tappings, electric appliance use and temperature settings of the building. Building heat Load is calculated using a simplified physical model, to allow for realistic energy demand profiles, efficient model parametrisation and fast computation. A randomisation approach for building heat Load based on a clustered building typology, a variation of building parameters and heating settings is presented which allows the simulation of larger quantities of similar buildings. Validation against measured data for German single family houses shows a correlation of the typical daily Load profile for DHW consumption of 0.92 and a mean relative error of 3% and for space heating 0.89 and 9% respectively.

A Ecevit - One of the best experts on this subject based on the ideXlab platform.

  • effect of Hot Water Load temperature on the performance of a thermosyphon solar Water heater with auxiliary electric heater
    Energy Conversion and Management, 1995
    Co-Authors: Adnan Shariah, A Ecevit
    Abstract:

    A thermosyphon solar Water heating system with an in-tank auxiliary electric heater has been simulated for different Hot Water Load temperatures using the TRNSYS simulation program. The results of the simulation show that the annual efficiency and solar fraction are functions of the Hot Water Load temperatures. The effect of Load temperature on the solar fraction is found to be very large when the daily Load volume (the volume of Hot Water delivered to Load) to collector area ratio is large. The influence of storage tank volume to collector area ratio on the efficiency of the collector is observed only when this ratio is less than or equal to 40 1 m2 for all collector areas and Load temperatures studied. Generally, the annual average storage tank temperature depends on the Load temperature and had lower values for high Load temperatures. The response of the system performance to the area of the collector is found to be very large when the system operates with a solar fraction below 70%.

Kyungtaek Chung - One of the best experts on this subject based on the ideXlab platform.

  • analysis on the effect of thermal performance with various Load patterns for solar Hot Water heating system
    International Journal of Air-conditioning and Refrigeration, 2007
    Co-Authors: Hwan Young Jang, Kyungtaek Chung
    Abstract:

    The performance of a solar Water heater incorporating evacuated tubes was evaluated using a transient simulation program, TRNSYS. Simulations were performed for 60℃ of Hot Water Load temperature and for 280 liter of daily Hot Water volumes and three 400 liter of storage tank volumes. Three patterns of daily Hot Water consumption profile were used in the present study (morning, lunch and evening). The results show that the increase in solar fraction depends on the Load profile, as well as the collector efficiency coefficient. Hot Water draw profile has a large effect on the performance of the SDHWS, the morning Load profile has the highest solar fraction. The annual solar fraction of the system, at the weather conditions of Jinju is approximately 84% at lunch Load pattern, the 280 ㎏ of Load volume, 400 ㎏ of tank volume and the 60℃ of Load temperature.