The influence of the wall temperature on the flow from the floor convector ( experimental results )

floor convector inlet evaluate the influence of the wall cooling.

Floor convectors are heating bodies intended installation into floor free convection or forced convection for the heating.The main objective of this study is driven by a fan The floor convectors are usually placed by shield the cold flow from the the window can be replaced by a cooled wall.flow from the convector can be at some position at the cooled wall reverse the wall.This effect is very convectors utilizing the free convection however it can forced convection.assembly is shown in Figure housing, which allows placing of other convector components and also collects from the convector can be at some position at the reversed by a cold flow falling down along This effect is very s utilizing the free convection however it can also occur in convectors based on the forced convection.Basic scheme of assembly is shown in Figure 1.It consists of which allows placing of other convector components and also collects The measurement is realized in is visualized using PIV technique.Two temperatures evaluate the influence of the wall cooling.

Floor convectors are heating bodies intended
The floor convectors can utilize the free convection or forced convection for the heating.The main objective of this study is a convector, placed in the front part of the convector.The floor convectors are usually placed by he cold flow from the window.In an experiment the window can be replaced by a cooled wall.
from the convector can be at some position at the cold flow falling down along This effect is very strong especially s utilizing the free convection in convectors based on the scheme of a floor convector 1.It consists of which allows placing of other convector components and also collects the water from In an experiment the window can be replaced by a cooled wall.The hot from the convector can be at some position at the cold flow falling down along especially in the s utilizing the free convection effect [1]; in convectors based on the floor convector 1.It consists of a sheet metal which allows placing of other convector water from  The distance between the fins is large for natural convection and small for the forced convection.convectors has been studied there is a wide [ design and optimization of th [4] floor convectors design.One of methods w used for the investigation of the flow above the convector is PIV (Particle Image Velocimetry) [5] provides the information velocity.In this method the flow is visualized by introducing particles into the investigated flow.The introducing of the particles has to be adjusted carefully it could

2
Experimental set measurement floor convector is by the regulated electrical supply.The heat power the where ܸ outlet, and the convector.functions of temperature.The volume flux trough the convector is measured using temperatures on the convector inl measured using three thermocouples each.Two thermocouples from each pair are used for measurement and the third is used to The distance between the fins is large for natural convection and small for the forced convection.convectors has been studied there is a wide [3].Note that the design and optimization of th [4], however there is lack of literature focused on the floor convectors design.One of methods w used for the investigation of the flow above the convector is PIV (Particle Image Velocimetry) [5] provides the information velocity.In this method the flow is visualized by introducing particles into the investigated flow.The introducing of the particles has to be adjusted carefully it could disturb the investigated flow.

Experimental setup
Experimental set measurement of the heat power floor convector is by the regulated electrical supply.The heat power the convector is The distance between the fins is large for natural convection and small for the forced convection.convectors has been studied there is a wide theoretical background given e.g. in [ the most of the design and optimization of th however there is lack of literature focused on the floor convectors design.One of methods w used for the investigation of the flow above the convector is PIV (Particle Image Velocimetry) [5] provides the information about velocity.In this method the flow is visualized by introducing particles into the investigated flow.The introducing of the particles has to be adjusted carefully disturb the investigated flow.

Experimental setup
Experimental setup used for the of the heat power floor convector is heated from by the regulated electrical supply.The heat power convector is calculated using calorimetric equation as The distance between the fins is large for natural convection and small for the forced convection.
intensively for many years theoretical background given e.g. in [ most of the literature is focused on the design and optimization of the heat exchangers generally however there is lack of literature focused on the floor convectors design.One of methods w used for the investigation of the flow above the convector is PIV (Particle Image Velocimetry) [5], [6] about the flow pattern velocity.In this method the flow is visualized by introducing particles into the investigated flow.The introducing of the particles has to be adjusted carefully disturb the investigated flow.

Experimental setup
up used for the convector supply and the of the heat power is shown in Figure from a boiler which is supplied by the regulated electrical supply.The heat power using calorimetric equation as The distance between the fins is large for natural convection and small for the forced convection.As the intensively for many years theoretical background given e.g. in [2], focused on the e heat exchangers generally however there is lack of literature focused on the floor convectors design.One of methods which can be used for the investigation of the flow above the convector , [6].This method the flow patterns and the velocity.In this method the flow is visualized by introducing particles into the investigated flow.The introducing of the particles has to be adjusted carefully as convector supply and the is shown in Figure 2. The boiler which is supplied by the regulated electrical supply.The heat power ܳ ሶ of using calorimetric equation as The temperature difference at the convector is set up using the following procedure.First required value.Then by the by the flow rate adjustment the outlet temperature is set to required value.The temperature at the wall is controlled by chiller with the r measurement are collected a LabView signal express application placed in the floor of sheet for the PIV measurement perpendicularly to the cooled wall Figure 3 sheet.For the comparison of the infl temperature on temperature was to 19.7 temperature difference outlet was set at based particles, which were introduced at the into the convector by provided length.

Outlet
EPJ Web of Conferences temperature difference at the convector is set up using the following procedure.First required value.Then by the by the flow rate adjustment the outlet temperature is set required value.The temperature at the wall is controlled by the cold water delivery from an industrial ller with the regulation range 1K.All the data measurement are collected LabView signal express application placed in the floor of an for the PIV measurement perpendicularly to the cooled wall 3. The camera is placed perpendicularly to the For the comparison of the infl temperature on the flow from the convector perature was to 19.7 temperature difference was set at 10°C based particles, which were introduced at the into the convector by provided an uniform saturation along the convector  temperature difference at the convector is set up using the following procedure.First, the inlet temperature is set at required value.Then by the controlled boiler supply and by the flow rate adjustment the outlet temperature is set required value.The temperature at the wall is cold water delivery from an industrial egulation range 1K.All the data measurement are collected in a databox and monitored by LabView signal express application an open space laboratory.The laser for the PIV measurement perpendicularly to the cooled wall

Results
The camera is placed perpendicularly to the For the comparison of the infl the flow from the convector perature was to 19.7 °C and to 12.5 temperature difference between the convector °C.The flow was based particles, which were introduced at the into the convector by a perforated hosepipe uniform saturation along the convector The flow patterns above the convector temperature difference at the convector is set up using the he inlet temperature is set at controlled boiler supply and by the flow rate adjustment the outlet temperature is set required value.The temperature at the wall is cold water delivery from an industrial egulation range 1K.All the data from the databox and monitored by LabView signal express application.The convector is open space laboratory.The laser for the PIV measurement is generated perpendicularly to the cooled wall as it is visible in The camera is placed perpendicularly to the For the comparison of the influence of the wall the flow from the convector the wall °C and to 12.5 °C. the convector inlet and The flow was saturated by oil based particles, which were introduced at the fan perforated hosepipe.This setup uniform saturation along the convector temperature difference at the convector is set up using the he inlet temperature is set at controlled boiler supply and by the flow rate adjustment the outlet temperature is set required value.The temperature at the wall is cold water delivery from an industrial from the databox and monitored by The convector is open space laboratory.The laser is generated as it is visible in The camera is placed perpendicularly to the uence of the wall the wall °C.The inlet and saturated by oil fan inlet This setup uniform saturation along the convector  The velocity profile at the position 340 convector outlet.
The inlet region ends with the stagnation region.corresponds with the placement , which is visible at the top of the The change in the length of this sheet c influence the size of the inlet and the outlet region and also the inlet and outlet velocities.The outlet region has highest velocity close to the convector grid and the flo profile thickness is increasing with the vertical position.
Figure 5. shows the velocity profiles at the distance 340 mm above the convector for the wall temperatures °C and 12.5 °C.The velocity temperature shows a lower maximum probably caused by the falling cold flow owever the difference between the velocity values is low.The measured heat power for the wall temperature °C is 662 W and the heat power for the temperature °C is 650 W. The increase in the heat power can be caused by a cold flow falling into the convector inlet from the cooled wall.The measured ribs temperature was Figure 6.shows the comparison of vertical velocity components for the wall temperatures 12.5 °C.The indicate ence in the velocity magnitude.Slight flow deceleration can be deduced from the velocity close to the The high velocity at the left corner of the picture is protrusion at the wall.results of the PIV measurement or for the wall temperature 19.8 velocity is indicated in the layer close to the wall.ends with the stagnation region.
s with the placement of the covering , which is visible at the top of the The change in the length of this sheet can significantly influence the size of the inlet and the outlet region and also the inlet and outlet velocities.The outlet region has highest velocity close to the convector grid and the flo profile thickness is increasing with the vertical position.
Figure 5. shows the velocity profiles at the distance 340 mm above the convector for the wall temperatures velocity profile for the lower lower maximum velocity probably caused by the falling cold flow along the between the velocity values is low.The measured heat power for the wall temperature °C is 662 W and the heat power for the temperature The increase in the heat power can be ing into the convector inlet .The measured ribs temperature was Figure 6.shows the comparison of vertical velocity components for the wall temperatures 12. 5 figures indicate no significant ence in the velocity magnitude.Slight flow deceleration can be deduced from the velocity close to the The high velocity at the left corner of the picture is at the wall.an significantly influence the size of the inlet and the outlet region and also the inlet and outlet velocities.The outlet region has highest velocity close to the convector grid and the flow profile thickness is increasing with the vertical position.
Figure 5. shows the velocity profiles at the distance 340 mm above the convector for the wall temperatures profile for the lower velocity.This is along the wall; between the velocity values is low.The measured heat power for the wall temperature °C is 662 W and the heat power for the temperature The increase in the heat power can be ing into the convector inlet .The measured ribs temperature was Figure 6.shows the comparison of vertical velocity components for the wall temperatures 12.5 °C no significant ence in the velocity magnitude.Slight flow deceleration can be deduced from the velocity close to the The high velocity at the left corner of the picture is Figure 7. shows the he velocity above the °C.The highest velocity is indicated in the layer close to the wall.

Heat power Watt
Its of the covering Figure .1.an significantly influence the size of the inlet and the outlet region and also the inlet and outlet velocities.The outlet region has w profile thickness is increasing with the vertical position.
Figure 5. shows the velocity profiles at the distance 340 mm above the convector for the wall temperatures profile for the lower .This is wall; between the velocity values is low.The measured heat power for the wall temperature °C is 662 W and the heat power for the temperature The increase in the heat power can be ing into the convector inlet .The measured ribs temperature was Figure 6.shows the comparison of vertical °C no significant ence in the velocity magnitude.Slight flow deceleration can be deduced from the velocity close to the The high velocity at the left corner of the picture is .shows the above the °C.The highest The velocity does not change significantly along the vertical position.The PIV measurement of the velocity the wall temperature 12.5°C.The velocity distribution is similar to the one for the wall temperature 19.8 however the maximum velocity is lower.The summary results is presented in T

Conclusions
The measurements of the influence of the wall temperature on the flow from using PIV method.The results show that The flow from the convector for the wall temperature °C.The size of the displayed area was 630x480 mm.comparison of the vertical velocity for temperature 19.8 °C and 12.5 °C.
The velocity does not change significantly along the vertical position.The Figure 8. shows the results of the of the velocity above the convector for the wall temperature 12.5°C.The velocity distribution is for the wall temperature 19.8 however the maximum velocity is lower.The summary results is presented in Table 1.
of the influence of the wall temperature on the flow from a convector w method.The results show that The flow from the convector for the wall temperature .The size of the displayed area was 630x480 mm. of the wall cooling is insignificant in the measured area.However it does not mean that this effect cannot occur at a higher vertical position.The future investigation will be focused on the measurement of the velocity profiles at higher positions at the cooled wall where a flow deflection from the wall is expected.The results show that the real inlet velocity can be influenced by the velocity of the delivered visualization fluid, which is in this region of the same order.

1
Floor convectors are heating bodies intended installation into floor free convection or forced convection for the heating.The main objective of this study is driven by The floor convectors are usually placed by shield t the window can be replaced by a cooled wall.flow cooled the convector however it can forced convection.assembly is shown in Figure housing components and also collects The influence of the wall temperature on the flow from the floor convector (experimental results) 1 Introduction

Floor
convector principle.The influence of the wall temperature on the flow from the floor convector , P. Dancova 1 Faculty of Mechanical Engineering Faculty of Mechatronics, Informatics and Interdisciplinary Studies article describes the measurement of the influence of the wall temperature on flow from the The measurement is realized in is visualized using PIV technique.Two temperatures evaluate the influence of the wall cooling.Floor convectors are heating bodies intended for the The floor convectors can utilize the free convection or forced convection for the heating.The which flow is placed in the front part of the convector.The floor convectors are usually placed by windows to

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The influence of the wall temperature on the flow from the floor convector of Mechanical Engineering, Faculty of Mechatronics, Informatics and Interdisciplinary Studies the measurement of the influence of the wall temperature on flow from the The measurement is realized in an open space laboratory.The velocity field at the convector is visualized using PIV technique.Two temperatures the The floor convectors can utilize the free convection or forced convection for the heating.The which flow is placed in the front part of the convector.windows to In an experiment hot from the convector can be at some position at the cold flow falling down along in the ; in convectors based on the floor convector t metal which allows placing of other convector condensation forced convection in the convector is usually driven by centrifugal upper grid and direct (hot or cold) out of the convector.exchanger Industrial chiller The influence of the wall temperature on the flow from the floor convector , 46117 Liberec 1 Faculty of Mechatronics, Informatics and Interdisciplinary Studies the measurement of the influence of the wall temperature on flow from the open space laboratory.The velocity field at the convector is visualized using PIV technique.Two temperatures 19.8 °C and 12.

Fig. 2 .The influence of the wall temperature on the flow from the floor convector Liberec 1 ,Flowmeter
Fig. 2. condensation in the case of forced convection in the convector is usually driven by centrifugal fan.The fan grid and directs (hot or cold) out of the convector.exchangers are commonly used
is water density which depends on temperature, water volume flux measured at the convector the heat capacity at constant pressure and are the inlet and outlet temperatures of the flow at Note that the density and heat capacity are functions of temperature.The volume flux trough the convector is measured using an temperatures on the convector inl measured using three thermocouples each.Two thermocouples from each pair are used for measurement and the third is used to Cooled wall (controlled temperature) is water density which depends on temperature, water volume flux measured at the convector heat capacity at constant pressure and are the inlet and outlet temperatures of the flow at Note that the density and heat capacity are functions of temperature.The volume flux trough the an inductive flow meter.The temperatures on the convector inlet and outlet are measured using three thermocouples each.Two thermocouples from each pair are used for measurement and the third is used to set the right value.The (

( 1 )
is water density which depends on temperature, water volume flux measured at the convector heat capacity at constant pressure and t in are the inlet and outlet temperatures of the flow at Note that the density and heat capacity are functions of temperature.The volume flux trough the inductive flow meter.The et and outlet are measured using three thermocouples each.Two thermocouples from each pair are used for measurement the right value.The Inlet 75°C Outlet 65°C EPJ Web of ConferencesThe distance between the fins is large for natural As the intensively for many years ], focused on the e heat exchangers generally however there is lack of literature focused on the hich can be used for the investigation of the flow above the convector .This method and the velocity.In this method the flow is visualized by introducing particles into the investigated flow.The as convector supply and the The boiler which is supplied ሶ of using calorimetric equation as (1) is water density which depends on temperature, water volume flux measured at the convector in are the inlet and outlet temperatures of the flow at Note that the density and heat capacity are functions of temperature.The volume flux trough the inductive flow meter.The et and outlet are measured using three thermocouples each.Two thermocouples from each pair are used for measurement the right value.

Figure 4 .
Figure 4. shows basic flow patterns at the convector inlet and outlet.At the inlet the air saturated with the particles is sucked trough the covering grid into the sucks the cold air wide.The flow in the inlet region is slightly tubulised, which results in

Figure 4 .
Figure 4. shows basic flow patterns at the convector inlet and outlet.At the inlet the air saturated with the particles is sucked trough the covering grid into the the cold air trough wide.The flow in the inlet region is slightly tubulised, which results in small inlet velocities.

Figure 4 .
Figure 4. shows basic flow patterns at the convector inlet and outlet.At the inlet the air saturated with the particles is sucked trough the covering grid into the trough its upper part the inlet region is wide.The flow in the inlet region is slightly tubulised, small inlet velocities.

Figure 4 .
Figure 4. shows basic flow patterns at the convector inlet and outlet.At the inlet the air saturated with the particles is sucked trough the covering grid into the fan.As the upper part the inlet region is wide.The flow in the inlet region is slightly tubulised, small inlet velocities.

Figure 4 .
Figure 4. shows basic flow patterns at the convector inlet and outlet.At the inlet the air saturated with the particles .As the fan upper part the inlet region is wide.The flow in the inlet region is slightly tubulised,

Fig. 5 .
Fig. 5.The velocity profile at Figure 7 results of the PIV measurement of the velocity or for the wall temperature 19.8 °C.The highest velocity is indicated in the layer close to the wall.ends with the stagnation region.Its of the covering , which is visible at the top of the Figure.1.

3 Fig. 8 .
Fig. 8.The flow from the convector for the wall temperature 12.5 °C.The size of the displayed area was 630x480 mm.

Table 1 .
Results summary