a) a primary heat transfer loop wherein the primary heat transfer loop comprises a primary heat transfer fluid having a total flow rate, a temperature and a pressure, a high value heat source, at least one heat transfer device to transfer heat from the high value heat source to the primary heat transfer fluid, a means to divide the said total flow rate into at least two portions each having a separate flow rate and a means to adjust the flow rates of the first portion and the second portion of the said at least two portions;

b) an intermediate heat transfer loop wherein the intermediate heat transfer loop comprises an intermediate heat transfer fluid having a flow rate, at least one primary heat transfer device to transfer heat from at least a first portion of the primary heat transfer fluid to the intermediate heat transfer fluid, at least one heat primary transfer device to transfer heat from at least a second portion of the primary heat transfer fluid, a means to adjust the flow rate of the intermediate heat transfer fluid, and a means to measure or determine the temperature of the intermediate heat transfer fluid at a least two locations;

c) a power cycle loop wherein the power cycle loop comprises a power cycle fluid having a flow rate, at least one of a circulating fan, blower, compressor and/or a pump, at least one turbine stage to convert the heat or enthalpy of the power cycle fluid to useful work or power, at least two power cycle heat transfer devices to transfer heat from the intermediate heat transfer fluid to increase the temperature or enthalpy of the power cycle fluid, at least one tertiary heat transfer device to reject residual heat from the power cycle fluid to an external system, and a means to measure or determine the temperature of the power cycle fluid for at least two locations;

d) a sequence of the said at least two primary heat transfer devices and the at least two power cycle heat transfer devices to transfer heat from the primary heat transfer fluid to the power cycle fluid such that the intermediate heat transfer fluid is first increased in temperature by transferring at least some heat from the first portion of the primary heat transfer fluid to the intermediate heat transfer fluid, then the intermediate heat transfer fluid is reduced in temperature by transferring at least some heat to the power cycle fluid, then the intermediate heat transfer fluid is again increased in temperature by transferring at least some heat from the second portion of the primary heat transfer fluid and then the intermediate heat transfer fluid is again reduced in temperature by transferring at least some heat to the power cycle fluid;

e) a means to adjust the flow rate of the first portion of the primary heat transfer fluid to achieve a desired temperature setpoint condition at one power cycle fluid location; and

f) a means to adjust the flow rate of the second portion of the primary heat transfer fluid to achieve a desired temperature setpoint condition at another power cycle fluid location.