Consultation on chilled water temperature and utility price setting

a) Hello, I learned from ```bst.settings.get_agent('chilled_water')``` that ```T``` of chilled water is ```280.37K```, ```T_limit``` is ```300K```. However, the temperature of chilled water in NREL (corn stover 2011 model) is ```4-15 degrees``` (as shown in the figure below). May I ask you what is the source of the temperature of chilled water in BioSTEAM?

b) If I pass ```bst.facilities.ChilledWaterPackage(area or 'CWP')``` and ```CT = bst.facilities.CoolingTower(area or 'CT')``` to establish the ```ChilledWaterPackage``` and ```CoolingTower```, is it not necessary to set the price of cooling water and chilled water in the process (that is, it is not necessary to set the ```heat_transfer_price``` and ```regeneration_price``` of ```bst.settings.get_agent('cooling_water')``` and ```bst.settings.get_agent('chilled_water'```), is it right?

c) At present, the boiler is set to heat by burning the incoming natural gas. If I set ```satisfy_system_electricity_demand=False``` when I call the boiler, the heat of the required ```medium pressure steam, low pressure steam and high pressure steam``` seems to be supplied by natural gas. Is it not necessary to set the price of medium pressure steam, low pressure steam and high pressure steam in the process (that is, it is not necessary to set ```heat_transfer_price``` and ```regeneration_price``` of ```bst.settings.get_heating_agent('low_pressure_steam'), bst.settings.get_heating_agent('medium_pressure_steam') and bst.settings.get_heating_agent('high_pressure_steam')```), just set ```T, P, heat_transfer_efficiency``` (according to the temperature, pressure and heat exchange efficiency of medium pressure steam, low pressure steam and high pressure steam I find) of ```bst.settings.get_heating_agent('low_pressure_steam'), bst.settings.get_heating_agent('medium_pressure_steam')``` and ```bst.settings.get_heating_agent('high_pressure_steam')```, is it right?