نتایج جستجو برای: collector pipe

تعداد نتایج: 23093  

This paper deals with the performance of a heat pipe solar collector. The solar collector consisted of an interconnected heat pipe so as to reduce the production cost by using an interconnected heat pipe because all the heat pipes can be evacuated, sealed and tested at once. Performance of a prototype of the heat pipe solar collector was experimentally examined, and the results were compared wi...

In this study, a new configuration of heat pipes as Heat Pipe Network is introduced. Here, the heat pipe network is designed, constructed and then has been under the performance assessment. This heat pipe network consists of 4 vertical heat pipes connected to evaporator collector from bottom and condenser collector from top. In order to investigate the effect of nanofluids on the thermal effici...

In this study, an experimental system that includes evacuated tube heat pipe solar collector, is constructed and tested under weather conditions of Sanandaj in 21 August, 30 August and 7 September. Then a mathematical model, based on energy and exergy balance equations have been developed and the theoretical results were compared with experimental ones. The obtained results showed that the opti...

Journal: :international journal of environmental research 2014
h. kargarsharifabad m. behshad shafii m. taeibi rahni m. abbaspour

the use of solar collectors in combination with heat pipes is rapidly growing in recent years.heat pipes, as heat transfer components, have undeniable advantages in comparison with other alternatives. the most important advantage is their high rate of heat transfer at minor temperature differences. although there have been numerous studies on the heat analysis or first thermodynamic analysis of...

2016
K. Chen

An evacuated tubular solar collector was fabricated from acrylics for improved resistance to shattering. A plasmatron was employed to apply a thin gas-barrier coating to the surfaces of the plastic tube to prevent/alleviate gas infiltration. Experiments were conducted to investigate the effect of vacuum level on the performance of the non-glass vacuum-tube solar collector. Inserted in the evacu...

In this study, thermal performance of the collector with analytic and quasi-dynamic method is evaluated based on energy balance equations for each part of the U-pipe evacuated tube solar collector. Using this approach, effect of different parameters such as tube size, overall heat loss coefficient, absorber tube absorptivity, mass flow rate and air layer thermal resistance on thermal performanc...

Journal: :civil engineering infrastructures journal 0
farzin salmasi water engineering department, faculty of agriculture, university of tabriz, tabriz, iran. behnam mansuri m.sc. student of hydraulic structures, university of tabriz, tabriz, iran amir raufi m.sc. student of hydraulic structures, university of azad ahar, ahar, iran.

relief wells are used extensively to relieve excess hydrostatic pressure in pervious foundation strata overlain by impervious top strata, conditions which often exist landward of levees and downstream of dams and hydraulic structures. placing well outlets in below-surface trenches or collector pipes helps dry up seepage areas downstream of levees and dams. relief wells are often used in combina...

2015
James Allan Zahir Dehouche Sinisa Stankovic

Nomenclature Ac collector area (m 2) Cb bond conductance (W/m·K) Cp specific heat (J/K·kg) De external pipe diameter (m) Di internal pipe diameter (m) FR heat removal factor hfi heat transfer coefficient (W/m 2·K) k thermal conductivity (W/m·K) ṁ mass flow rate (kg/sec) Qu useful energy per unit time (W) Ta ambient temperature (°C) Tpm average plate temperature (°C) UL overall heat loss coeffic...

2003
M. Singaperumal Somashekhar. S. Hiremath

The analyzed electrohydraulic servo valve is jet pipe type, is one of the mechatronics component used for precision flow control application. The jet pipe servo valves have one movable nozzle and two collector ports, from where fluid is ducted to the main valve spool. The servovalve analyzed here is basically used in fuel control application in Variable Geometry Actuation System (VGAS) of a gas...

1998
C. Kutscher Charles F. Kutscher

Market penetration studies indicate that in the absence of tax credits, large reductions in the costs of active solar water/space heating systems will be necessary. A number of potential means for equipment and labor cost reductions are presented. The use of drainback systems with polybutylene pipe and a variety of low-cost collector concepts is discussed. The pros and cons of the various drain...

نمودار تعداد نتایج جستجو در هر سال

با کلیک روی نمودار نتایج را به سال انتشار فیلتر کنید