Method and device for generating a heating medium

A method for generating a steam heating medium, being a method for generating, from a nozzle, Aqua-gas or low-temperature superheated steam that is a steam heating medium by operating an electrothermal-type generator or a steam-type generator, the method comprising the step of:

• 1) generating Aqua-gas by increasing a water supply amount in such a manner that an internal nozzle pressure takes on a constant value exceeding a saturated water vapor pressure of water at each internal nozzle pressure set temperature;
• or
• 2) generating low-temperature superheated steam by reducing the water supply amount in such a manner that the internal nozzle pressure does not exceed the saturated water vapor pressure of water at each internal nozzle pressure set temperature,
• in a relational expression relating to a flow rate of water vapor sprayed from the nozzle, and given by Expression 1 or Expression 2 below (in Expression 1, G is the water vapor flow rate, Cd is a nozzle coefficient, A2 is a nozzle outlet cross-sectional area, P1 is the internal nozzle pressure, P2 is a nozzle outlet pressure, T1 is an internal nozzle temperature, R is a gas constant of water vapor, κ is a specific heat ratio of water vapor, and P2 is atmospheric pressure in case that a water vapor jet flow from the nozzle is no faster than a speed of sound and is given by Expression 2 in the case of the speed of sound).
• [
• Expression
• 
• 
• 1
• ]
• 
• G
• =
• Cd
• ·
• A
• 2
• 
• P
• 1
• RT
• 1
• 
• (
• P
• 2
• P
• 1
• )
• 1
• κ
• 
• 2
• 
• κ
• κ
• -
• 1
• 
• {
• 1
• -
• (
• P
• 2
• P
• 1
• )
• κ
• -
• 1
• κ
• }
• [
• E1
• ]
• [
• Expression
• 
• 
• 2
• ]
• 
• P
• 2
• =
• P
• 1
• 
• (
• 2
• κ
• +
• 1
• )
• κ
• κ
• -
• 1
• [
• E2
• ]