An application of conservation of mass to the analysis of physical systems and heat balance sheet is an account of heat supplied and heat utilised in various ways in the system.
Often it is more convenient to apply the first law or a heat balance to an open system, a fixed region or control volume across the boundaries of which materials may travel and inside which they may accumulate, such as a building, an aircraft engine, or a section of a chemical process plant. Here, the heat balance of a facility is often obtained as the sum of the heat balances of the pieces of equipment making up the facility. A distinction is made between rated heat balances and experimental heat balances, which are obtained from thermal testing data. Figure 1. A statement of the conservation of energy in a thermodynamic system. Net energy crossing a system boundary equals the energy change inside the system. Heat (Q) is energy transferred due to a temperature difference and is considered positive if it is inward or added to the system.  A heat balance may be expressed in the form of an equation, with one side giving the sum of the amounts of input heat and the other side giving the amounts of heat used or lost. Heat balances may also be expressed in the form of a table or a diagram (Figure 1). Here, the heat balance of a facility is often obtained as the sum of the heat balances of the pieces of equipment making up the facility. A distinction is made between rated heat balances and experimental heat balances, which are obtained from thermal testing data. Figure 1. Heat and Mass Balance. Heat and mass balance is a document produced by process design engineers while designing a process plant. Sometimes heat and mass balance is not a separate document but appears alongside the Process Flow Diagram (PFD). A heat and mass balance sheet represents every process stream on the corresponding PFD in terms of the process conditions. Normally a heat and mass balance sheet reports following data for a process stream. 1  Normal operating temperature and pressure. This region is called the control volume. In our derivation of the mass balance equation, we have referred to the mass of pollutant in a lake and the fluxes of pollutant into and out of the lake---that is, we have used a lake as our control volume. Theoretically, any volume of any shape and location can be used In environmental monitoring the term budget calculations is used to describe mass balance equations where they are used to evaluate the monitoring data (comparing input and output, etc.) In biology the dynamic energy budget theory for metabolic organisation makes explicit use of mass and energy balances. When a mass balance is made for a tube, one first considers an infinitesimal part of the tube and make a mass balance over that using the ideal tank reactor model. That mass balance is then integrated over the entire reactor volume to obtain: Thermometer (3 Nos) Theory and Description: A heat balance sheet is an account of heat supplied and heat utilised in various ways in the system. Necessary information concerning the performance of the engine is obtained from the heat balance sheet.  For example, mass balance theory is used to design chemical reactors, to analyse alternative processes to produce chemicals, as well as to model pollution dispersion and other processes of physical systems. When a mass balance is made for a tube, one first considers an infinitesimal part of the tube and make a mass balance over that using the ideal tank reactor model. That mass balance is then integrated over the entire reactor volume to obtain: Energy balance calculation for heat exchanger. For hot fluid side of a heat exchanger let, m H: mass flow rate of the hot fluid in kg/hr. Cp H: mass heat capacity of the hot fluid in Joules/kg 0 C. Ti H and To H: Respectively inlet and outlet temperatures on exchanger hot side in 0 C. m C: mass flow rate of the cold fluid in kg/hr. Cp C: mass heat capacity of the cold fluid in Joules/kg 0 C. A mass balance, also called a material balance, is an application of conservation of mass to the analysis of physical systems. By accounting for material entering and leaving a system, mass flows can be identified which might have been unknown, or difficult to measure without this technique. When a mass balance is made for a tube, one first considers an infinitesimal part of the tube and make a mass balance over that using the ideal tank reactor model. That mass balance is then integrated over the entire reactor volume to obtain:
http://encyclopedia2.thefreedictionary.com/Heat+balance http://www.eitexam.com/Search2/Thermo/FirstLaw.asp?SB=1 http://encyclopedia2.thefreedictionary.com/Heat+balance http://www.enggcyclopedia.com/2011/01/heat-mass-balance/ http://www.cee.mtu.edu/~reh/courses/ce251/251_notes_dir/node3.html https://en.wikipedia.org/wiki/Mass_balance http://pacetmechanical.weebly.com/uploads/6/1/9/7/6197211/heat_balance_sheet_on_ic_engine.pdf https://en.wikipedia.org/wiki/Mass_balance http://www.enggcyclopedia.com/2011/10/energy-balance-calculation-heat-exchanger/ https://en.wikipedia.org/wiki/Mass_balance
what is mass and heat balance