Last edited by Mikora
Thursday, April 23, 2020 | History

2 edition of Heat loss reduction techniques for annular solar receiver designs found in the catalog.

Heat loss reduction techniques for annular solar receiver designs

Arthur C Ratzel

Heat loss reduction techniques for annular solar receiver designs

  • 55 Want to read
  • 8 Currently reading

Published by Dept. of Energy, [Office of the Assistant Secretary for Defense Programs], Sandia Laboratories, for sale by the National Technical Information Service] in Albuquerque, N.M, [Springfield, Va .
Written in English

    Subjects:
  • Heat -- Transmission,
  • Solar collectors

  • Edition Notes

    StatementArthur C. Ratzel, Fluid Mechanics and Heat Transfer Division II, 5512, Charles E. Simpson, Devices Testing Division, 1543 ; prepared by Sandia Laboratories for the United States Department of Energy under contract DE-AC04-76DP00789
    SeriesSAND ; 78-1769
    ContributionsSimpson, Charles E., joint author, United States. Dept. of Energy, Sandia Laboratories. Fluid Mechanics and Heat Transfer Division II, Division 5512, Sandia Laboratories. Devices Testing Division, 1543
    The Physical Object
    Pagination60 p. :
    Number of Pages60
    ID Numbers
    Open LibraryOL14883182M

      Figure 3. Pipe heat loss is based on watts per linear foot rather than the entire pipe area, so the mean insulation area for one linear foot of pipe is calculated. Table 1. An example will help illustrate the point. Suppose you want to raise a 4" steel pipe filled with water from 40°F (°C) to 90°F (32°C) in one hour. Base the calculation. USA1 US13/, USA USA1 US A1 US A1 US A1 US A US A US A US A1 US A1 US A1 Authority US United States Prior art keywords receiver solar solar radiation heat receivers Prior art date Cited by: absorb the heat. Figure-4 shows the heat loss that happened at the top of the solar collector for solar water heating system. This heat loss value has risen from the first point till the 17 th point (marked with arrow) and stabilized with the little decreasing. The maximum heat loss gives the value of W/unit areas. The heat lossAuthor: M. Norhafana, A. F. Ismail, Z. A. A. Majid, Kuala Lumpur. the solarblogger roots around in the nation’s airing cupboards Tucked away in a cupboard, perhaps behind a pile of towels and bed linen, out of sight and out of mind. The domestic hot water cylinder often escapes our attention, but it has .

    Reducing the heat loss at night from solar water heaters of the integrated collector–storage variety 89 In Eq. (1), T is the temperature of the water in water levels were marked off on the rod. Six storage, Ta is the ambient temperature and I is the thermocouples were then attached to .


Share this book
You might also like
Dead Reckoning

Dead Reckoning

Progress and history

Progress and history

readers guide to Finnegans wake.

readers guide to Finnegans wake.

Patterns on the wall.

Patterns on the wall.

CAD Based Programming for Sensory Robots (Nato Asi Series Series F, Computer and Systems Sciences, Vol 50)

CAD Based Programming for Sensory Robots (Nato Asi Series Series F, Computer and Systems Sciences, Vol 50)

computer aided mine planning model and energy efficiency ratios of four mining systems

computer aided mine planning model and energy efficiency ratios of four mining systems

The protection of fundamental rights in the legal order of the European Union

The protection of fundamental rights in the legal order of the European Union

Multinationals in China

Multinationals in China

Solo trumpet

Solo trumpet

Apg Handbook, 2000

Apg Handbook, 2000

Keepin it real!

Keepin it real!

North American Indians of the plains

North American Indians of the plains

Anti-intellectualism in American life

Anti-intellectualism in American life

Development of a test set for adjustment of residential furnaces and boilers

Development of a test set for adjustment of residential furnaces and boilers

Heat loss reduction techniques for annular solar receiver designs by Arthur C Ratzel Download PDF EPUB FB2

Get this from a library. Heat loss reduction techniques for annular solar receiver designs. [Charles E Simpson; Ratzel, Arthur C.; United States. Department of Energy.; Sandia Laboratories.

Fluid Mechanics and Heat Transfer Division II; Sandia Laboratories. Devices Testing Division, ]. @article{osti_, title = {Techniques for reducing thermal conduction and natural convection heat losses in annular receiver geometries}, author = {Ratzel, A.

and Hickox, C. and Gartling, D. K.}, abstractNote = {An effective device for the collection of solar energy which has received widespread attention is the so called parabolic-cylindrical solar collector. @article{osti_, title = {Energy loss by thermal conduction and natural convection in annular solar receivers}, author = {Ratzel, A.

and Hickox, C. and Gartling, D. K.}, abstractNote = {An effective device for the collection of solar energy is the so called parabolic-cylindrical solar collector. In this device, a circular receiver tube, with a suitable selective.

A possible solar receiver is sketched in Figure 2, patterned after the ones described in the literature.(1) The receiver is shown as tronco-conical in depth and of a square cross-section (in practice, it would be of octogonal cross section).The front surface (aaaa) receives the solar energy reflected by the heliostats.

This face is protected by a cover of zirconium over an. In typical high temperature receiver tube designs the rate of energy loss by combined thermal conduction and natural convection is of the same order of magnitude as that due to thermal radiation, and can amount to approximately 6% of the total rate at which energy is absorbed by the solar by: 1.

A novel design of a high-temperature pressurized solar air receiver for power generation via combined Brayton–Rankine cycles is proposed.

It consists. Heat loss is an important factor in predicting the performance of solar receiver of concentrated solar power (CSP) systems. This study presents a numerical simulation calculating convection and radiation heat losses from four different receiver shapes including external and cavity type receivers with different opening ratios (ratio of cavity aperture area to receiver area).Cited by: Heat loss analysis on dish-mounted receivers has been a major focus in solar receiver research in the past, with works by Le Roux et al.

[7], Reddy et al. [8], Abbasi-Shavazi et al. [9], Prakash. Wind effects on convective heat loss from a cavity receiver for a parabolic concentrating solar collector [Ma, Robert Y] on *FREE* shipping on qualifying offers.

Wind effects on convective heat loss from a cavity receiver for a parabolic concentrating solar collectorAuthor: Robert Y Ma. such receiver designs under operational conditions is discussed.

INTRODUCTION The capture of incident solar energy with a cavity receiver situated near the focus of a much larger collection area is an established technology in high-temperature concentrating solar thermal systems.

Examples include the ANU Big Dish [1] and central tower systems [2]. parabolic trough collector/receiver model calculated solar field heat loss using the emittance curve correlation presented above and reasonable collector and solar field assumptions.

ar Sol Advisor Model (SAM) and Excelergy heat loss correlation coefficients were generated from the heat loss outputs of the Size: 1MB.

The numerical study of the natural convection loss occurring from cylindrical solar cavity receivers is reported in this communication. These cavity receivers can be used with solar dish concentrators for process heat applications at medium temperature levels. Three cylindrical cavity receivers of diameter, and m with aspect ratio equal to one and opening ratios of 1 Cited by: Wind Effects on Convective Heat Loss From a Cavity Receiver for a Parabolic Concentrating Solar Collector Robert Y.

Ma Department of Mechanical Engineering California State Polytechnic University Pomoma, CA Prepared by Sandia National Laboratories Albuquerque, New File Size: 4MB. The heat loss of vacuum receiver plays critical important role in solar parabolic trough system.

In this paper, experimental measurements and calculation models were conducted to investigate the heat loss of solar parabolic trough receiver with receiver length of m and diameter of m. In general, the heat loss of receiver decreased with the receiver wall temperature, while it Author: Jian Feng Lu, Jing Ding, Jian Ping Yang, Kang Wang.

Effectively storing solar power for delivery overnight and when the sun isn’t shining is a key advancement that will allow solar thermal to better compete with other energy sources. Different configurations of tube banks have the potential to reduce the heat losses from the receiver by up to 50 per cent, lowering the cost of power production.

Figure Logic flow for computing receiver heat loss - glass A C. (a), Evaluation of the Evacuated Solar Annular Receivers Employed at the Midtemperature Solar Systems Test Facility, SAND A.C., and C.E. Simpson (), Heat Loss Reduction Techniques for Annular Receiver Designs, SANDSandia National.

HEAT TRANSFER ANALYSIS AND MODELING OF A PARABOLIC TROUGH SOLAR RECEIVER IMPLEMENTED IN ENGINEERING EQUATION SOLVER ABSTRACT This report describes the development, validation, and use of a heat transfer model implemented in * Total length of solar receiver = m Heat Loss for Different Step Sizes 0 50 While looking through solar heat gain information, I learned that a number is attributed to this concept, called the Solar Heat Gain Coefficient (SHGC) which is expressed as a value between 0 and 1.

The higher the number the more sunlight that can pass through, whether it is a window or a window screen. Heat Loss from Cavity Receiver for Solar Micro-Concentrating Collector Tanzeen Sultana1, Graham L Morrison1, Andrew Tanner2, Mikal Greaves2, Peter Le Lievre2 and Gary Rosengarten1 1School of Mechanical and Manufacturing Engineering, University of New South Wales, Sydney, NSWAustraliaFile Size: KB.

International Conference on Concentrating Solar Power and Chemical Energy Systems, SolarPACES Investigation of heat loss from a solar cavity receiver E.

Abbasi-Shavazia,*, G.O. Hughesb, J.D. Pyea a Solar Thermal Group, Research School of Engineering, The Australian National University, Canberra, ACT Australia. The collector efficiency can be improved by reducing the overall losses.

Efficiency of the collector depends on overall loss coefficient which is the sum of Top loss, Bottom loss and edge loss. The present theoretical analysis is on Overall Heat Loss Coefficient of a solar collector with and without in-built Phase Change Material (PCM).Cited by: 1.

Thermochemical hydrogen production is of great interest due to the potential for significantly reducing the dependence on fossil fuels as energy carriers. In a solar plant, the solar receiver is the unit in which solar energy is absorbed by a fluid and/or solid particles and converted into thermal energy.

When the solar energy is used to drive a reaction, the receiver is also a reactor. The preliminary design of a solar heat receiver for use as a heat source for an earth-orbiting kWe Brayton-cycle engine is described. The result was a cavity heat receiver having the shape of a frustum of a cone.

The wall of the cone is formed by 48 heat-transfer tubes, each. calculating the heat loss My problem is very simple and I am sorry for that. I would like to calculate the heat loss provoked by the incoming air that heats up because of the hot walls in the cavity, then flows out due to buoyancy and other factors such as wind (not there yet), and the air in general that is heated up, because all the air that.

Thls paper describes an advanced heat plpe heat receiver designed for a solar dynamic space power sys-tem. The power system consists of a solar concentra-tor, solar heat receiver, Stirllng heat engine, linear alternator and waste heat radiator. The solar concen-trator focuses the sun's energy into a heat by: 4.

2 ANNULAR AIR SOLAR RECEIVER Carel 1 van der Merwe and Dr JE Hoffmann2 aBEng (Mechanical) Candidate, Dept. Mechanical and Mechatronic Engineering, University of Stellenbosch bSenior Lecturer –Dept.

Mechanical and Mechatronic Engineering, University of. An Experimental Study of Natural Convection Heat Loss from a T.

Taumoefolau et al Solar Concentrator Cavity Receiver at Varying Orientation Proceedings of Solar - Australian and New Zealand Solar Energy Society Paper 1 3 q Fig. 3: Energy balance of model receiver. estimation of convection heat loss from receiver that is Nu L = () s w r L w T A Gr h TA (11) Where Gr L = 3 2 g T T L()w Convection Heat Loss Characterization for Solar Concentrators.

In this paper heat losses from cavity receiver of solar concentrators are presented. Convective and radiative losses for specified cavity receiver are estimated by MATLAB programming and effect of the various parameters is studied.

Radiation losses are analyzed for operating temperature in range of °C to °C and aspect ratio of to Author: Sanjay D. Barahate, P.R. Dongarwar, Vinod C.

Shewale. Solar Age Magazine was the official publication of the American Solar Energy Society. The contemporary solar energy magazine associated with the Society is Solar Today. "Established inthe nonprofit American Solar Energy Society (ASES) is the nation's leading association of solar professionals & mission is to inspire an era of energy innovation and.

Singh, Yuvraj, "Thermal Analysis of a Solar Cavity Receiver" ().Theses and Thermal Analysis of a Solar Cavity Receiver By Yuvraj Singh A Thesis cavity receiver for the three popular heat transfer fluids. 1 Chapter 1. Introduction The growing energy needs of today’s world, call for not only viable, efficient.

The performance of any solar water heater is largely affected by the losses experienced within the system. This research reports the effect of wind speed, number of glazing cover, ambient temperature, gap spacing between absorber plate and the glazing cover, tilt angle and the emissivity of the absorber plate on the overall heat-loss coefficient of a flat-plate collector.

This heat loss calculation form (Excel) is an open architecture. You may enter your values of your location and determine the heat loss for the project. The first page consists of a short form with 15% of efficiency loss added.

Page 2 is more specific and will calculate the heater requirement. Keywords- Double-pipe heat exchanger, conventional baffles, annular baffles, heat and mass transfer, heat transfer rate and efficiency.

INTRODUCTION Heat exchanger are devices that exchange heat between two fluids of different temperatures that are separated by a solid wall. The temperature gradient or the differences in. Opening ratio, Convection loss, Cavity receiver, Radiation loss. In this paper spheric 1.

INTRODUCTION In solar energy thermal systems, heat loss mechanisms can significantly reduce the efficiency and consequently the cost effectiveness. It is therefore vital to fully understand the nature of these heat loss mechanisms. Unless there is vaporization from the surface, there is no heat loss due to wind.

If the air is hotter than the surface, heat will flow from the air to the surface. If the surface is hotter than the air, then heat will flow from the surface to the air.

If they are both at the same temperature, then there will be no heat transfer. Recent Advancement in a Flat Plate Solar Thermal Collector using Heat Enhancement Techniques: Review Jayshree Raut1 Dr. Walke2 Student 1,2Department of Mechanical Engineering 1,2G.H.

Raisoni College of Engineering, Nagpur, Maharashtra, India Abstract—This paper provide recent developments carried. Cautions on Using the Heat Loss Calculator. This calculator gives a ROUGH estimate of the heat loss for a home. It is easy to use, but because of its simple approach, is subject to a.

DIY Solar Projects 2 A SURVEY OF AIR-HEATER OPTIONS Solar-heated air can be used in a wide variety of applications, but it is a limited re-source. Only so much sunshine strikes each square foot of the earth, and a well-built col-lector system will typically deliver about half of this energy to a house in the form of Size: 1MB.

When fluid motion first begins to contribute to the heat transfer process, the top loss coefficient increases until a maximum is reached at ap­proximately 20 mm.

Further increase in the plate spacing causes a small reduction in the top loss coefficient. Similar behavior occurs at other conditions and for other collector designs. in the receiver tube absorbs solar energy and transfers it to water in heat exchangers to produce hot water or steam.

The receiver is covered by a glass tube to reduce thermal radiation as well as convection heat loss to the free air which moves around the receiver.

To reduce further the heat losses from the absorber, air is evacuated from the. I'm assuming the solar gain/wind/ect are the same from one day to the next. I just tried an online heat loss calc and just adjusted the design temp and came up with a linear relation.

Now, I will admit there is less and less Solar gain until the Winter equinox, which goes along with the drop in temp over the months in the NorthEast.the receiver are proposed, regarding local thermal stress and pressure loss reduction.

This thesis project also introduces a ray-thermal coupled numerical design method, which combines ray tracing techniques (using FRED ®), with thermal performance analysis (using .