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Promoting, selling, recruiting, coursework and thesis posting is forbidden. Students Click Here. Related Projects. Home Forums Chemical Engineers Activities Chemical engineering other topics Forum Calculating amount of steam required thread I'm trying to determine the amount of steam required to heat a water tank on our plant. How many pounds of 30 psig steam are needed to heat gallons of water from 70F to F? Pick-up a copy of Spirax Sarco's "Hook-Ups", and all will be revealed. If you suggest that you might buy something like a temperature control valve or steam trap, the local rep will likely just give you one.
It would seem that you should be able to do this. I'll give you a hint. What is the duty required?
I'm interning with a company right now and I've been assigned to calculate the amount of steam necessary for a system conversion. I'm currently taking thermodynamics and do understand the concepts but I'm getting a little confused on this calculation.
I do know how to calculate the amount of condensate this is producing and such but I can't seem to wrap my head around how to use the sensible heat to calculate the pounds of a certain type of steam necessary.
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This is for direct steam injection using a sparge and i'm trying to compare benefits of 30 steam versus steam. You better hope the tank is not losing heat to atmosphere while you are heating the water. Might be a good idea to heat the tank as well as the water. Hint - for a vertical surface insulated with 1. That's as long as the wind does not blow. TBP gave you a good hint. The tank is well insulated, so for calculation purposes the heat loss through convection and radiation is negligible.
Heat of vaporization is only constant at constant temperature. You are talking about saturated stema, right? The problem looked like a student doing homework to which we do not respond. Based on the question as initially posted, consider the following: 1.All Rights Reserved. The material on this site can not be reproduced, distributed, transmitted, cached or otherwise used, except with prior written permission of Multiply.
Hottest Questions. Previously Viewed. Unanswered Questions. Heating Ventilating and Air Conditioning. Math and Arithmetic. Mechanical Engineering. How many BTU's does it take to evaporate one pound of water? Wiki User Before you can evaporate the water, you must heat it to it's boiling point.
The warmer the water you start with the fewer BTUs will be needed to heat the water to its boiling point. Keep in mind the BTUs require to raise the water to its boiling point are very few compared to the BTUs required to change the water from a liquid to a gas.
One pound of steam contains BTUs. This is the energy you need to put into the water for it to evaporate if you start with water at 32F. You can get all this information in a steam table which can be found easily by searching the web. It takes about a thousand BTUs to turn a pound of water into a pound of steam, and that's how many BTUs must be removed to condense a pound of steam back into a pound of water. A pound propane tank has a capacity of 2, BTUs. Long answer: It depends on the temperature and pressure of the water you start with.
One litre of water weighs about 2. Asked in Heating Ventilating and Air Conditioning, Math and Arithmetic How many btus does it take to raise half pound of water 1 degree? One BTU is the energy required to raise one pound of water by one degrees. Therefore, your answer would be one half.1 cup serving size grams
There are no BTUs in an office water-cooler. But you can calculate how many BTUs are removed by the cooler. One BTU or British Thermal Unit is the amount of heat energy required to raise the temperature of one pound of water one degree Fahrenheit. There for when you remove one BTU you are lowering one pound of water one degree Fahrenheit. So if you know how many pounds of water you have and the temperature of the water you start with and the temperature of the water comming out of the cooler you can calculate how many BTUs the cooling unit of the water cooler has removed.
The specific heat of water is 1 BTU per pound per degree Fahrenheit.Let's assume that the water is ready to be vaporized, i. We need to know the enthalpy of vaporization for water also called the latent heat of vaporization. This can be found from standard tables as:. Now we just need to use this like a conversion factor to find the energy we are looking for knowing the mass of the water we are working with:.
How much energy is needed to vaporize 0. Chemistry Thermochemistry Thermochemistry of Phase Changes. David B. Apr 27, Explanation: Let's assume that the water is ready to be vaporized, i. Related questions How much energy is required to convert How do you calculate the heat required to melt 15 kg of silver? When a liquid loses energy, will it change into a gas or a solid? What is the name of the process when a liquid changes into a gas?Home assistant ifttt examples
How much energy is needed to convert What amount of ice must be added to How can I find specific heat in thermochemistry of phase of changes? How much energy is required to convert Calculate the number of joules given off when How many joules of heat are needed to change See all questions in Thermochemistry of Phase Changes.
Impact of this question views around the world.All Rights Reserved. The material on this site can not be reproduced, distributed, transmitted, cached or otherwise used, except with prior written permission of Multiply. Hottest Questions. Previously Viewed. Unanswered Questions. How much energy is needed to evaporate 1g of water at room temperature?
Wiki User If room temp is 72 degrees C then 28 calories to get to boiling then the it takes calories to water from liquid to gas, called the heat of vaporization.
So add to 28 and you get calories. That's the energy to convert 1g of water at room temperature to 1g of steam at deg C. And if your room temperature is really 72 deg C you are in trouble - more probably degrees Fahrenheit. Many times, the units of energy are given in joules J and 1 calorie is equivalent to 4. The specific heat of water is 4. Exposure to the atmosphere will cause water to evaporate. The higher the atmospheric temperature the faster the rate of evaporation.
Asked in Chemistry, Evaporation and Condensation What provides the energy that water needs to evaporate? These energy sources are the movement of water molecules and the temperature. Asked in Elements and Compounds What temperature is needed to separate magnesium chloride from water?Ministers who are freemasons
The water will slowly evaporate on its own at room temperature, but boiling temperature will do it much faster! Asked in Chemistry, Climatology and Climate Changes, Science Experiments What might happen if enough energy is absorbed by liquid water? The temperature will rise, and the water will evaporate. Asked in Chemistry, Evaporation and Condensation What is needed to make the water evaporate and leave the salt behind? At higher temperature the evaporation is faster. Asked in Chemistry, Evaporation and Condensation How much energy is required to evaporate The needed energy at oC is MJ.
Asked in Chemistry, Evaporation and Condensation What will make the water evaporate? When water molecules at the surface gain sufficient energy they can escape in the atmosphere.
The energy of water molecules increase by a temperature increase.If 1 kg mass of water which is 1 liter, by volume is all converted into steam, the result will be exactly 1kg mass of steam.
However, the volume occupied by a given mass depends upon its pressure. At atmospheric pressure 1kg of steam occupies nearly 1. At a pressure of 1bar abs, that same 1 kg of steam will only occupy 0. Thus, steam should always be generated and distributed at rated boiler pressure and used at possible low pressure. The volume of 1kg of steam at any given pressure is termed its Specific Volume symbol Vg.
In practice, steam often carries tiny droplets of water with it and cannot be described as dry saturated steam. Nevertheless, we find that it is usually important that the steam used for process or heating is as dry as possible. The steam becomes "wet" if water droplets in suspension are present in the steam space, carrying no specific enthalpy of evaporation. The small droplets of water in wet steam have weight but occupy negligible space.
The volume of wet steam is, therefore, less than that of dry saturated steam. Dryness fraction of the steam depends upon the steam boiler design and capacity. As long as water is present, the temperature of saturated steam will correspond to the figure indicated for that pressure in the Steam Tables.
However, if heat transfer continues after all the water has been evaporated, the steam temperature will again rise. The steam is then called "superheated", and this "superheated steam" can be at any temperature above that of saturated steam at the corresponding pressure. Superheated Steam is totally dry and follows the gas laws. Saturated steam will condense very readily on any surface which is at a lower temperature and gives up the enthalpy of evaporation which, as we have seen, is the greater proportion of its energy content.
On the other hand, when superheated steam gives up some of its enthalpy, it does so by virtue of a fall in temperature. No condensation will occur until the saturation temperature has been reached, and it is found that the rate at which we can get energy to flow from superheated steam is often less than we can achieve with saturated steam.
Even though the superheated steam is at a higher temperature, superheated steam because of its properties, is the natural first choice for power steam requirements, whilst saturated steam is ideal for process and heating applications. The chemical energy, which is contained in coal, gas or other boiler fuel, is converted into heat energy when the fuel is burned. That heat energy is transmitted through the wall of the boiler furnace to the water.
The temperature of the water is raised by this addition of heat energy until saturation point is reached — it boils. The heat energy which has been added and which has had the effect of raising the temperature of the water is known as the liquid enthalpy. At that point of boiling, the water is termed Saturated Water. Heat transfer is still taking place between the furnace walls and the water.
The additional enthalpy produced by this heat transfer does not increase the temperature of the water.
It evaporates the water, which changes its state into steam. The enthalpy that produces this change of state without change of temperature is known as the enthalpy of evaporation. Are you from India? How plenty do you realize approximately demographics? Your are generalising Christians too plenty. Even police and the close by politicians are biased, because of the fact Christians at the instant are not their votebanks.
My suggestion for you is to open your concepts and please think of. In India, Christians are a mushy aim for communal forces.The input energy required to change the state from liquid to vapor at constant temperature is called the latent heat of vaporization. When a liquid vaporize at the normal boiling point the temperature of the liquid will not rise beyond the temperature of the boiling point.Zuul without eureka example
The heat required to evaporate 10 kg can be calculated as. Add standard and customized parametric components - like flange beams, lumbers, piping, stairs and more - to your Sketchup model with the Engineering ToolBox - SketchUp Extension - enabled for use with the amazing, fun and free SketchUp Make and SketchUp Pro.⚗️ Using the Heat of Vaporization in Calculations (Part 1)
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Fluids - Latent Heat of Evaporation Latent heat of vaporization of fluids - alcohol, ether, nitrogen, water and more Sponsored Links.
The latent heat of vaporization is the amount of "heat required to convert a unit mass of a liquid into vapor without a change in temperature". Privacy We don't collect information from our users.
How much energy is needed to evaporate 1 liter of water in 5 minutes?
Citation This page can be cited as Engineering ToolBox, Fluids - Latent Heat of Evaporation. Modify access date. Scientific Online Calculator. Make Shortcut to Home Screen?Benchmarking the fuel cost of steam generation, in dollars per 1, pounds. Coal ton. Benchmark the Fuel Cost of Steam.
Current Consumption: Fuel Type. Annual Boiler. But if you actually convert some fuel to electricity, some energy will be lost due to Here are the efficiences for different kinds of fuels usually for turning a steam turbine : Natural Gas: It takes 0.
Figure 1: U. Natural Gas Consumption by Economic Sector exhaust from a gas-fired combustion turbine is used to create steam to power a steam turbine. CHP has much higher efficiency than separate generation of heat and. Oct 31, In addition, natural gas is a limited resource; the cost of hydrogen produce hydrogen as well as electricity, either by adding steam and A single fuel cell produces just over 1 volt, so hundreds are stacked together for typical applications.
It also requires a lot of round trips: A ton vehicle that can ca. Heat rate is the heat input required to produce one unit of electricity. Food plant CHP. Paper mill Power plant. Textile industry. Waste heat recovery. It also requires a lot of round trips: A ton vehicle that can ca Heat rate is the heat input required to produce one unit of electricity.
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