PTMS thermal bus vapor cycle architecture

1 . A power and thermal management system thermal bus vapor cycle architecture comprising:

a gas turbine engine having a fan proximate a forward portion and a low pressure turbine proximate an aft portion;

an inner fan duct spanning between the fan and the lower pressure turbine;

a gas turbine outer fan duct spanning between the fan and the low pressure turbine;

a bypass duct formed between the inner fan duct and the outer fan duct, the bypass duct extending from the fan to the low pressure turbine, wherein a bypass air is configured to flow within the bypass duct from the fan aft toward the low pressure turbine;

a condenser coil located within the bypass duct, the condenser coil being configured as a heat exchanger configured to contact the bypass air;

at least one evaporator coil fluidly coupled to the condenser coil and located within the bypass duct upstream of the condenser coil relative to a bypass air flow direction, the at least one evaporator coil being configured as a heat exchanger configured to contact the bypass air;

an expansion valve fluidly coupled between the condenser coil and the at least one evaporator coil;

a gearbox in operative communication with the gas turbine engine; and

a variable speed compressor in operative communication with the gearbox, the variable speed compressor being fluidly coupled with the at least one evaporator coil and the condenser coil.

2 . The power and thermal management system thermal bus vapor cycle architecture according to claim 1 , further comprising:

a controller in operative communication with the variable speed compressor, wherein the variable speed compressor is configured to vary the rate of compression responsive to a controller input and a gas turbine engine operational status.

3 . The power and thermal management system thermal bus vapor cycle architecture according to claim 1 , wherein the at least one evaporator coil comprises staged evaporator coils configured as a series of two fluid heat exchangers or three fluid heat exchangers, wherein the staged evaporator coils comprise sequenced stages from a forward lowest thermal demand to a highest thermal demand being most aft relative to the bypass air flow direction responsive to standard day operating conditions.

4 . The power and thermal management system thermal bus vapor cycle architecture according to claim 1 , wherein the at least one evaporator coil comprises a two-fluid configuration with a static vapor-only sink and alternating passages of vapor and source.

5 . The power and thermal management system thermal bus vapor cycle architecture according to claim 1 , wherein the at least one evaporator coil comprises a three-fluid configuration arranged to operate utilizing bypass air, wherein the three-fluid configuration employs a combination of vapor and bypass air as cooling sinks.

6 . The power and thermal management system thermal bus vapor cycle architecture according to claim 5 , wherein the three-fluid configuration comprises dynamic dual sinks including a vapor and the bypass air, with the dynamic dual sinks including a sink-source pairing and bypass air configured for cooling, wherein valving and a manifold are configured to transport the vapor as a heat transfer fluid to and from stages for re-cooling and reuse.

7 . A process for thermal management with a power and thermal management system thermal bus vapor cycle architecture comprising:

forming a bypass duct between an inner fan duct and an outer fan duct in a gas turbine engine;

locating a condenser coil within the bypass duct;

configuring the condenser coil as a heat exchanger;

fluidly coupling at least one evaporator coil to the condenser coil;

locating the at least one evaporator coil within the bypass duct upstream of the condenser coil relative to a bypass air flow direction;

configuring the at least one evaporator coil as a heat exchanger;

fluidly coupling an expansion valve between the condenser coil and the at least one evaporator coil;

coupling a gearbox in operative communication with the gas turbine engine;

coupling a variable speed compressor in operative communication with the gearbox; and

fluidly coupling the variable speed compressor with the at least one evaporator coil and the condenser coil.

8 . The process of claim 7 , further comprising:

coupling a controller in operative communication with the variable speed compressor; and

configuring the variable speed compressor to vary the rate of compression responsive to a controller input and a gas turbine engine operational status.

9 . The process of claim 7 , further comprising:

configuring the at least one evaporator coil as staged evaporator coils; and

configuring the staged evaporator coils as a series of two fluid or three fluid heat exchangers, wherein the staged evaporator coils comprise sequenced stages from a forward lowest thermal demand to a highest thermal demand being most aft relative to the bypass air flow direction responsive to standard day operating conditions.

10 . The process of claim 7 , wherein the at least one evaporator coil comprises a two-fluid configuration with a static vapor-only sink and alternating passages of vapor and source.

11 . The process of claim 7 , further comprising:

configuring the at least one evaporator coil as a three-fluid configuration arranged to operate utilizing bypass air; and

employing a combination of vapor and bypass air as cooling sinks.

12 . The process of claim 11 , further comprising:

configuring the three-fluid configuration as dynamic dual sinks including a vapor and the bypass air, with the dynamic dual sinks including a sink-source pairing and bypass air configured for cooling, wherein valving and a manifold are configured to transport the vapor as a heat transfer fluid to and from stages for re-cooling and reuse.

13 . The process of claim 12 , further comprising:

allowing at least one of fluids selected from the group consisting of fuel, engine oil, gearbox oil, hydraulic fluid, vehicle heat transfer fluid, and generator oil to act as a sink; and

allowing at least one of fluids selected from the group consisting of fuel, engine oil, gearbox oil, hydraulic fluid, vehicle heat transfer fluid, and generator oil to be cooled by the vapor and bypass air when needed to maintain predetermined temperatures.

14 . The process of claim 10 , further comprising:

allowing at least one of fluids selected from the group consisting of fuel, engine oil, gearbox oil, hydraulic fluid, vehicle heat transfer fluid, and generator oil to act as a sink; and

allowing at least one of fluids selected from the group consisting of fuel, engine oil, gearbox oil, hydraulic fluid, vehicle heat transfer fluid, and generator oil to be cooled by the vapor when needed to maintain predetermined temperatures.

15 . The process of claim 7 further comprising:

configuring the at least one evaporator coil and/or the at least one condenser coil as an annulus disk shape heat exchanger.