Radiator Definition and 67 Threads

Hi. The general advice for positioning a central heating radiator seems to be to mount it under a window. The reason being that windows are cold spots and the falling cooler air from the window and the rising warmer air from the radiator help the formation of a convection current around the...

Hi everyone! I'm doing a DIY project in which I have to use air cooling to regulate water temperatures of max 90°C. I want to use some cheap (possibly even used) pre-manufactured radiator to do the job for me (since I'm unable to make finned pipes with tight enough fittings to provide...

Hi, Has anyone experience with photovoltaic solar panels and thermal radiator type solar panels? 1/ How do they compare when both have the same collection area? If the thermal radiator was much smaller than the collection area, and a lens the size of the collection area was used, focused on...

I'm looking for a way to keep a liquid under 50°C. This liquid has a thermal conductivity of .1396 and a specific heat of 2.054 both at 40°C. and a constant energy source submerged in it ranging from 16KW to 17.5KW. I'm barely starting to read about this topic, according some forums, a car...

My attic gets very hot even with the exhaust fan I installed. I would like to move than heat to my swimming pool. I currently have a FAFCO solar pool heater where the pool pump pumps water up onto my roof and thru the 12' long solar panel and down back into the pool. I would like to free up roof...

An apartment has a radiator, about 1000 W. Nearly right above it is an extract valve for the ventilation system which extracts 35 m3/h. The vertical distance between the two is around two meters. Is there a risk that this will prevent the radiator from functioning properly as the hot air will...

I am looking for a passive way to convert a supply of hot air into warm pool water. My pool can be in the low 70s without heat. Looking to get a 10 degree lift in pool temp. Pool is in-ground and relatively small at 8,500 gal. Water flow rate through the radiators can be regulated by valves...

Here is the Q below This is what I have tried so far. I ended up getting a value of 1772.4 watts Is this the correct way of doing this problem?

Hello all, I suffer from having a very cold house - as it is rented, we cannot put insulation in or change the windows (single glazed!), so I am looking for non-permanent options to maximise the warmth we can get from it. We have a log burner, and I have found that it is still kicking heat out...

What would cause a hole to form in the top aluminium tank of a radiator of an earthmoving machine. The tank material is 6mm thick and is made from 1050 aluminium plate. The material around the hole has bubbles almost like pitting corrosion or like somebody went and took a flame to it. The rest...

I want to upgrade my radiator to a bigger one in my project formula car,with the same engine and pump, what are the cons of it. Probably going to upgrade from a bike radiator to a car radiator. Also please help with calculations and reports.

What is the highest efficiency (electromagnetic) radiator shape? Meaning, a shape with the highest radiated power/volume (radiated power is in this case dependent only on surface area and how much of the radiation is reabsorbed by the radiatior)

I have been trying to understand the role of a cavity as a black body radiator in the derivation of planks black body radiation law but it has left me with 5 main questions: 1. If an object is a perfect absorber it must also be a perfect emitter, meaning that (allowing for a cavity not being a...

From Wien's law it is seen that approx 6500K(Greater than sun's temp) needed to heat a body to blue! But we see so much blue light(uv ray)! Are they formed from any different mechanism rather than heating?

I'm involved in a project with central heating. Due to a miscalculation the apartment radiators are about 50% too large. The current system water flow is based on the assumption that the radiators are the correct size (i.e. smaller), even though they are not. Due to this the water takes longer...

Common advice is to insulate hot water radiator pipes in the basement so you're not wasting money heating the basement. However, I wonder if it's really cost effective. I have a ton of pipes zigzagging in the basement. Cheap pipe insulation only seems to come in sizes 1/2 3/4 and 1in. However...

Homework Statement For school I'm doing a project on hawking radiaton but I have very big difficulties trying to understand it. I'm trying to understand the matter about: Unruh effect, particle pair (antimatter - matter) and the theory of relativity regarding vaccuum. Homework Equations none...

I am trying to solve a problem regarding an LPHW radiator, of which the heat output is controlled by adjusting the LPHW flow rate. The relationship between the flow rate and the radiator output can be approximated by a first order transfer function with a time constant of 1 minute. The heat...

Turned the boiler for the first time this fall and an upstairs bathroom rad is stone cold. All other rads heat up. I fiddled with the valve, which is new, with no luck. What is strange is that even the pipe from the floor leading to the valve is cold. This is a water system. It must cycle. How...

Let's say I have a spherically-uniform black-body radiator. It is losing energy, and therefore some of its mass, at a particular rate. From the frame of reference of the radiator, it has no momentum, but it has a changing amount of energy. From its frame of reference, the pressure on the...

Homework Statement The following data refer to an electrically operated refrigerator: - Efficiency : ## \xi = 2.4## - Temperature inside: ##T_i = -9 ° C ## - Temperature of the radiator ## T_r = 40 °C ## - Room temperature: ## T_s = 35 °C## - Total surface of walls: ## A = 3.2 m ^ 2 ## -...

Are there any equations out there which can calculate the heat dissipation of a water-cooled radiator with a fan on it? I would assume some of the variables would include: -Volume of the radiator (240 x 199 x 45mm)=2149200mm^3 -Specific heat of water (4.187 kJ/kgK) -Specific heat of the copper...

Hi all, As part of a school project, I'm attempting to demonstrate some sample calculations of a car radiator and I'm a little lost. I'd like to demonstrate some cooling requirements for the peak power output of my car engine: 325 horsepower at 4400 RPM. Can anyone offer any guidance as to...

Hello, this is my first post. This question is related to my final thesis. I'm calculating the heat exchange area of a radiator through heat exchange equations: Q = U*A*LMTD I have as data Q, and LMTD (this one through trivial calculations) In order to calculate U, I need the coefficients...

Hello guys, Below I am presenting a question related to thermal management in spacecraft . Perhaps many of you might find it interesting! And this could be a real-life problem for thermal engineering in a spacecraft . So, the question is following: An instrument dissipates 10W and, in order...

Hi, Situation A: Black radiator in a room with white walls. Situation B: White radiator in a room with black walls. Which one is the most efficient situation? I know that convection is dominant if you look at a radiator, but i would like to know the answer in terms of radiation. Thank you :)...

No separate coolant is used, instead lubricating oil to be used for both lubrication and cooling of engine. How to calculate radiator size, coolant flow rate?

Hello, I am trying to compare different combinations of Radiators and fans on their ability to cool water(or any liquid for that matter) Now I've been showen some Bernoulli's equation things and been pointed at Reynolds number but To be honest I haven't looked at any physics outside rigid...

hi, all. I have to design a radiator rejecting 100 kw of heat.how can I find example projects.

A radiator in a domestic heating system operates at a surface temperature of 55 C. Determine the rate at which it emits radiant heat per unit area if it behaves as a black body ? why we did not square the temperature I mean ( 273 + 55)^4 please I need your help

The radiator of a car can contain 10 gal of liquid. If it is half full with a mixture having 60% antifreeze and 40% water, how much more water must be added so that the resulting mixture has only a) 40% antifreeze? b) 10% antifreeze? Will it fit in the radiator?

Recently on an aquarium related forum, I called out someone for making what I considered to be an outlandish claim and I was supported by several others. However I wish to get the opinion and/or facts explained by someone from a purely scientific standpoint. This has to do with the heat...

Hey guys I'm BRAND SPANKING new to posting anything an any forum ever...this is a last resort at the end of much research, brainstorming and desperate googling... My problem: We've built a transformer tank to house the core and this will be filled with oil, a radiator was built as well...

Hi all, We got these rad reflector foils to improve your heating bills in our shop today. Trying to figure out if there any good. As a really quick test to see if they do anything, i stuck one to the kettle and measured the temp difference with a thermal imaging camera. (pics attached)...

Homework Statement 4. ANALYSIS The Excel Data File will allow the following analysis to be conducted for both emitter types: a) Calculate the variation in both the temperature drop across the emitter ( T) and total heat emitted (Q) over the entire test period for each of the 3...

Hello I am new here, Can anyone share with me on how to design car radiator.:confused:

This is not so muc a homework question as settling an argument: I have a clothes horse on which clothes can be hung parallel to each other roughly 50 cm apart. I place the clothes horse perpendicular to the radiator so the heat from the radiates along the length of the wet clothes. However my...

Hi, Might sound like a homework problem but since it isn't I posted it here. I currently live in a small 22m^2 student apartment. Heating is included in the rent, in the shape of a basic water radiator located below the window towards the wall (dont worry, there is nothing standing towards...

Hi guys can anyone help I have a problem trying to find an equation to work out the heat rejection for a car radiator I have Heat exchange = u x a x deltaT But I cannot find u ? The radiators have flat profile tubes and wave fin they are made from aluminium, the formulae would...

Now pardon me but my math isn't quite as good as it should be, But I've read a fair amount of mandelbrots material and the premise behind his theories as best as i can. The other week while looking at a liquid cooling radiator for my computer, i had the odd idea of instead of a single tube...

I have read in my class 10th book and other books that black(usually dark) colour is avoided in summers and this is the reason why impure ice melts quickly . I am wondering why ?

When I wrote this with regard to wind turbines on cars: ...I had no idea manufacturers actually did such things: http://www.usatoday.com/money/autos/2011-04-06-shutters-for-cars.htm Interesting stuff.

Homework Statement An electric radiator which is an ordinary constant resistor emits a heating power of 750 W at a mains supply voltage of 230 V. Homework Equations What is the total heating power in each respective instance when two such radiators are connected a) in parallel, and b) in...

Dear All, I am facing a problem in radiator design as I was unable to get a full fledge design procedure about the topic. Do I need to consider it as a crossflow heat exchanger or there is a specialized methodology? I performed some calculations by considering the flow of hot fluid as...

i need complete theory of tht pleasez help me

Hello, I am trying to revise for my Solar System exam and going through a past paper i have a question relating to something that we don't seem to have covered: "By estimating the energy output of the Sun's corona (in watts), comment on whether can be treated as a blackbody radiator...

When calculating the required area for a radiator using the equation Mass flow rate of air = Required Area x density of air x velocity of air Does the Required Area mean the Surface area on both sides of the radiator OR does it mean the total surface area of the cooling fins and...

Why is a rough surface a good absorber and radiator of infrared?

Hello, I'm new to this forum and I have a very important question about engineering design. I am currently working on my final project in my undergraduate study. The project that I am doing is about waste heat recovery design. My case study is a plant with a couple of ovens. The plan is to...

Let us assume we possesses a line radiator. It's extent is infinite and it radiates 360*. As far as I understand, an expanding spherical wave of order 0 is not dispersive. I assume an expanding cylindrical wave of order 0 would possesses dispersion, however I am not certain. Could any...