Heating Ventilating and Air Conditioning
What is the formula for heat loss calculation in insulations?
What is the percentage of heat loss from the whole-house fan or attic fan?
What is formula for boiler efficiency?
boiler efficiency calculation methods: Input-output method η = Output / Input Output is defined as the heat that is absorbed by working fluid. Input is defined as the chemical heat of fuel plus the heat that is added to working fluid, air, gas and other fluid circuit in which the fluid circuit across thin layer. Heat Loss Method Heat loss method is the method that is used to calculate the percentage amount of heat which is not useful. This method is very effective used in an attempt to find potential savings of boiler with heat balance. There are several factors act as the source of heat loss combustion. These factors will be used to calculate boiler efficiency based on heat loss method. The source of heat loss can be seen as following below: a. Heat loss due to dry flue gas Heat loss due to dry flue gas is the heat loss which is contained in dry flue gas such as CO2, O2 and N2. These gases are one of causes of heat loss in combustion process. The high temperature of flue gas coming out from boiler affect amount of heat loss. The weight and heat loss of dry flue gas of combustion of coal can be calculated as following formula: Wdfg = mCO2 + mSO2 + mO2 + mN2 Eloss dfg = Wdfg x Cp x (To - Ts) Where: Wdfg = weight of dry flue gas (kg/kg coal) Eloss dfg = heat loss in dry flue gas (kJ/kg) To = temperature of dry flue gas coming out from boiler Ts = temperature of surrounding by Gajanan Nalegaonkar
Asked in Physics
A thermos bottle has a shiny interior What type of heat transfer does it prevent?
Asked in Geometry
What is the relationship between heat loss and surface area?
Well, If the surface area is small, say 1 m2 . And the temperature is 1000C You lose only 2% of your heat. But if the surface area is big/largel, say 10 m2 . And the temperature is still 1000C You lose only 20% of your heat. So the bigger your surface area the bigger your heat loss is. Warning: It is a example, the calculation is not correct!
Asked in Math and Arithmetic, Geometry
What is the formula for the R - value?
simply put r-value= temperature differenceXareaXtime/heat loss the standard uses 75degrees on one side of a substance and the heat loss is measured across the substance this heat loss is then quantified by a temperature measurement of the noon standard temperature this becomes the temperature difference in the equation. the area is just that, in square feet and the time is in hours and the heat loss in Btu's. you dandan the heatin man