System and method for numerically evaluating thermal comfort inside an enclosure

• US 8,407,032 B2
• Filed: 06/10/2010
• Issued: 03/26/2013
• Est. Priority Date: 07/14/2009
• Status: Expired due to Fees

• Current Assignee: Airbus Group India Pvt Ltd. (Airbus SE), Airbus Operations GmbH (Airbus SE)
• Original Assignee: Airbus Engineering Centre India Co.
• Inventors: Tiwari, Punit, Reddy, Madhusudhana, Wick, Andreas
• Primary Examiner(s): Thangavelu, Kandasamy
• Application Number:
  US12/797,613
• Publication Number:
  US 20110015908A1
• Time in Patent Office: 1,020 Days
• Field of Search: 703/2, 703/6, 703/7, 706/45, 236/49.3, 236/44.C, 700/276, 702/50, 374/109
• US Class Current: 703/6
• CPC Class Codes: G01W 1/17 Catathermometers for measuring "cooling value" related either to weather conditions or to comfort of other human environment
• CPC Class Codes: G06F 2111/10 Numerical modelling
• CPC Class Codes: G06F 2119/08 Thermal analysis or thermal optimisation
• CPC Class Codes: G06F 30/15 Vehicle, aircraft or watercraft design
• CPC Class Codes: G06F 30/20 Design optimisation, verification or simulation optimisation, verification or simulation of circuit designs G06F30/30

Abstract

A system and method for assessing thermal comfort in an enclosure is disclosed. In one embodiment, a method includes performing a numerical analysis on a calibration enclosure including a thermal manikin in a uniform thermal environment to obtain a surface heat transfer coefficient (h_cal) for each body part of the thermal manikin. The method also includes performing a numerical analysis on an enclosure including one or more thermal manikins in a non-uniform thermal environment to obtain a total heat flux (q″_T) for each body part of the one or more thermal manikins. The method further includes computing an equivalent temperature (t_eq) of each body part of the one or more thermal manikins using the obtained associated h_cal, the obtained associated q″_T, and an associated surface temperature of the body part. Furthermore, the method includes evaluating thermal comfort in the enclosure based on each computed t_eq.

Claims

1. A method, implemented in a computing device, for numerically evaluating thermal comfort in an actual enclosure having a non-uniform thermal environment, comprising:

performing a numerical analysis on a calibration enclosure including a thermal manikin in a uniform thermal environment based on a given set of boundary conditions for the uniform thermal environment;

performing a numerical analysis on the actual enclosure including one or more thermal manikins in the non-uniform thermal environment based on a set of boundary conditions for the non-uniform thermal environment;

computing an equivalent temperature (t_eq) of each body part of the one or more thermal manikins in the non-uniform thermal environment based on the numerical analysis performed in the uniform thermal environment, non-uniform thermal environment, and surface temperature of each body part; and

evaluating the thermal comfort in the actual enclosure based on each computed t_eq using a numerical thermal comfort analysis module, wherein parameters that define the set of boundary conditions for the uniform thermal environment and the non-uniform thermal environment are selected from the group consisting of inlet parameters, thermal manikin body surface parameter, enclosure wall parameters, semi transparent wall parameters, thermal manikin clothing parameters and outlet parameters.

2. The method of claim 1, wherein performing the numerical analysis on the calibration enclosure including the thermal manikin in the uniform thermal environment based on the given set of boundary conditions, comprises:

generating a computational mesh of the calibration enclosure including the thermal manikin in the uniform thermal environment using a numerical analysis tool in the computing device and wherein the computational mesh includes a plurality of cells and each cell includes multiple nodes, wherein the thermal manikin includes body parts segregated based on a desired thermal comfort resolution;

performing a numerical analysis on the generated computational mesh to obtain fluid flow and heat transfer parameters for each cell based on the given boundary conditions for the uniform thermal environment using the numerical analysis tool; and

computing a surface heat transfer coefficient (h_cal) for each body part based on the obtained fluid flow and heat transfer parameters for each cell using the numerical analysis tool.

3. The method of claim 2, wherein performing the numerical analysis on the actual enclosure including the one or more thermal manikins in the non-uniform thermal environment based on the set of boundary conditions for the non-uniform thermal environment, comprises:

generating a computational mesh of the actual enclosure including the one or more thermal manikins in the non-uniform thermal environment using the numerical analysis tool and wherein the computational mesh includes a plurality of cells and each cell includes multiple nodes;

performing a numerical analysis on the generated computational mesh to obtain fluid flow and heat transfer parameters for each cell based on the set of boundary conditions for the non-uniform thermal environment using the numerical analysis tool; and

computing a total heat flux (q″

_T) for each body part of the one or more thermal manikins based on the obtained fluid flow and heat transfer parameters for each cell in the non-uniform thermal environment using the numerical analysis tool.

4. The method of claim 3, wherein computing the equivalent temperature (t_eq) of each body part of the one or more thermal manikins in the non-uniform thermal environment comprises:

computing the equivalent temperature (t_eq) of each body part of the one or more thermal manikins in the non-uniform thermal environment based on the computed h_cal, the computed q″

_T, and an associated surface temperature of the body part using the numerical thermal comfort analysis module in the computing device.

5. The method of claim 4, wherein the computational mesh is selected from the group consisting of 2D computational mesh and 3D computational mesh.

6. The method of claim 4, wherein the computational mesh is selected from the group consisting of structured, unstructured, and hybrid.

7. The method of claim 1, wherein the actual enclosure is selected from the group consisting of a building, a vehicle, and an aircraft.

8. The method of claim 1, wherein the inlet parameters are selected from the group consisting of inlet velocity, inlet flow temperature, and turbulence parameters.

9. The method of claim 1, wherein the outlet parameters are selected from the group consisting of outlet pressure, back flow total temperature, and back flow turbulence parameters.

10. The method of claim 1, wherein the enclosure wall parameters comprises a wall temperature, and wall surface and material properties.

11. The method of claim 1, wherein the semi transparent wall parameters are selected from the group consisting of semi transparent wall temperature, radiative properties of wall, and direction and magnitude of solar flux incidence.

12. The method of claim 1, wherein the thermal manikin body surface parameter is a thermal manikin body surface temperature.

13. The method of claim 1, wherein the thermal manikin clothing parameters are selected from the group consisting of clothing thickness and cloth thermal conductivity.

14. A system for numerically evaluating thermal comfort in an actual enclosure having a non-uniform thermal environment, comprising:

multiple client devices;

a computer network; and

a remote server coupled to the multiple client devices via the computer network, wherein the remote server comprises;

a processor; and

memory, wherein the memory includes a numerical analysis tool and a numerical thermal comfort analysis module, wherein one of the client devices accesses the numerical analysis tool via the computer network and performs a numerical analysis on a calibration enclosure including a thermal manikin in a uniform thermal environment using a given set of boundary conditions for the uniform thermal environment to obtain a surface heat transfer coefficient (h_cal) for each body part of the thermal manikin, wherein the one of the client devices using the numerical analysis tool further performs a numerical analysis on the actual enclosure including one or more thermal manikins in the non-uniform thermal environment using a set of boundary conditions for the non-uniform thermal environment to obtain a total heat flux (q″

_T) for each body part of the one or more thermal manikins, wherein the processor using the numerical thermal comfort analysis module computes an equivalent temperature (t_eq) of each body part of the one or more thermal manikins in the non-uniform thermal environment using the obtained h_cal, the obtained q″

_T, and an associated surface temperature of the body part, and wherein the processor using the numerical thermal comfort analysis module evaluates the thermal comfort in the actual enclosure based on each computed t_eq and outputs results of the evaluation on a display device of the one of the client devices.

15. The system of claim 14, wherein performing the numerical analysis on the calibration enclosure including the thermal manikin in the uniform thermal environment based on the given set of boundary conditions, comprises:

generating a computational mesh of the calibration enclosure including the thermal manikin in the uniform thermal environment using the numerical analysis tool and wherein the computational mesh includes a plurality of cells and each cell includes multiple nodes, wherein the thermal manikin includes body parts segregated based on a desired thermal comfort resolution;

performing a numerical analysis on the generated computational mesh to obtain fluid flow and heat transfer parameters for each cell based on the given set of boundary conditions for the uniform thermal environment using the numerical analysis tool; and

computing the surface heat transfer coefficient (h_cal) for each body part based on the obtained fluid flow and heat transfer parameters for each cell using the numerical analysis tool.

16. The system of claim 14, wherein performing the numerical analysis on the actual enclosure including the one or more thermal manikins in the non-uniform thermal environment based on the set of boundary conditions for the non-uniform thermal environment, comprises:

generating a computational mesh of the actual enclosure including the one or more thermal manikins in the non-uniform thermal environment using the numerical analysis tool and wherein the computational mesh includes a plurality of cells and each cell includes multiple nodes;

performing a numerical analysis on the generated computational mesh to obtain fluid flow and heat transfer parameters for each cell based on the set of boundary conditions for the non-uniform thermal environment using the numerical analysis tool; and

computing the total heat flux (q″

_T) for each body part of the one or more thermal manikins based on the obtained fluid flow and heat transfer parameters for each cell in the non-uniform thermal environment using the numerical analysis tool.

17. The system of claim 16, wherein the actual enclosure is selected from the group consisting of a building, a vehicle, and an aircraft.

18. An article, comprising:

a storage medium having instructions, that when executed by a computing device, result in execution of a method for numerically evaluating thermal comfort in an actual enclosure having a non-uniform thermal environment, comprising;

performing a numerical analysis on a calibration enclosure including a thermal manikin in a uniform thermal environment based on a given set of boundary conditions for the uniform thermal environment using a numerical analysis tool in the computing device to obtain a surface heat transfer coefficient (h_cal) for each body part of the thermal manikin;

performing a numerical analysis on the actual enclosure including one or more thermal manikins in the non-uniform thermal environment based on a set of boundary conditions for the non-uniform thermal environment using the numerical analysis tool to obtain a total heat flux (q″

_T) for each body part of the one or more thermal manikins;

computing an equivalent temperature (t_eq) of each body part of the one or more thermal manikins in the non-uniform thermal environment based on the obtained h_cal, the obtained q″

_T, and an associated surface temperature of the body part using a numerical thermal comfort analysis module in the computing device; and

evaluating the thermal comfort in the actual enclosure based on each computed t_eq using the numerical thermal comfort analysis module.

19. The article of claim 18, wherein performing the numerical analysis on the calibration enclosure including the thermal manikin in the uniform thermal environment based on the given set of boundary conditions, comprises:

generating a computational mesh of the calibration enclosure including the thermal manikin in the uniform thermal environment using the numerical analysis tool and wherein the computational mesh includes a plurality of cells and each cell includes multiple nodes, wherein the thermal manikin includes body parts segregated based on a desired thermal comfort resolution;

performing a numerical analysis on the generated computational mesh to obtain fluid flow and heat transfer parameters for each cell based on the given set of boundary conditions for the uniform thermal environment using the numerical analysis tool; and

computing the surface heat transfer coefficient (h_cal) for each body part based on the obtained fluid flow and heat transfer parameters for each cell using the numerical analysis tool.

20. The article of claim 18, wherein performing the numerical analysis on the actual enclosure including the one or more thermal manikins in the non-uniform thermal environment based on the set of boundary conditions for the non-uniform thermal environment, comprises:

generating a computational mesh of the actual enclosure including the one or more thermal manikins in the non-uniform thermal environment using the numerical analysis tool and wherein the computational mesh includes a plurality of cells and each cell includes multiple nodes;

performing a numerical analysis on the generated computational mesh to obtain fluid flow and heat transfer parameters for each cell based on the set of boundary conditions for the non-uniform thermal environment using the numerical analysis tool; and

computing the total heat flux (q″

_T) for each body part of the one or more thermal manikins based on the obtained fluid flow and heat transfer parameters for each cell in the non-uniform thermal environment using the numerical analysis tool.

21. A method, implemented in a computing device, for numerically evaluating thermal comfort in an actual enclosure having a non-uniform thermal environment, comprising:

performing a numerical analysis on a calibration enclosure including a thermal manikin in a uniform thermal environment based on a given set of boundary conditions for the uniform thermal environment using a numerical analysis tool in the computing device to obtain a surface heat transfer coefficient (h_cal) for each body part of the thermal manikin;

performing a numerical analysis on the actual enclosure including one or more thermal manikins in the non-uniform thermal environment based on a set of boundary conditions for the non-uniform thermal environment using the numerical analysis tool to obtain a total heat flux (q″

_T) for each body part of the one or more thermal manikins;

computing an equivalent temperature (t_eq) of each body part of the one or more thermal manikins in the non-uniform thermal environment based on the obtained h_cal, the obtained q″

_T, and an associated surface temperature of the body part using a numerical thermal comfort analysis module in the computing device; and

evaluating the thermal comfort in the actual enclosure by comparing each computed t_eq with a thermal comfort diagram using the numerical thermal comfort analysis module, wherein the thermal comfort diagram is formed using t_eq limits associated with comfort zone levels of each body part.

22. The method of claim 21, wherein performing the numerical analysis on the calibration enclosure including the thermal manikin in the uniform thermal environment based on the given set of boundary conditions, comprises:

generating a computational mesh of the calibration enclosure including the thermal manikin in the uniform thermal environment using the numerical analysis tool and wherein the computational mesh includes a plurality of cells and each cell includes multiple nodes, wherein the thermal manikin includes body parts segregated based on a desired thermal comfort resolution;

performing a numerical analysis on the generated computational mesh to obtain fluid flow and heat transfer parameters for each cell based on the given boundary conditions for the uniform thermal environment using the numerical analysis tool; and

computing the surface heat transfer coefficient (h_cal) for each body part based on the obtained fluid flow and heat transfer parameters for each cell using the numerical analysis tool.

23. The method of claim 21, wherein performing the numerical analysis on the actual enclosure including the one or more thermal manikins in the non-uniform thermal environment based on the set of boundary conditions for the non-uniform thermal environment, comprises:

generating a computational mesh of the actual enclosure including the one or more thermal manikins in the non-uniform thermal environment using the numerical analysis tool and wherein the computational mesh includes a plurality of cells and each cell includes multiple nodes;

performing a numerical analysis on the generated computational mesh to obtain fluid flow and heat transfer parameters for each cell based on the set of boundary conditions for the non-uniform thermal environment using the numerical analysis tool; and

manikins based on the obtained fluid flow and heat transfer parameters for each cell in

computing the total heat flux (q″

_T) for each body part of the one or more thermal the non-uniform thermal environment using the numerical analysis tool.

24. The method of claim 21, wherein the thermal comfort diagram is based on international standards for a type of the actual enclosure.

25. The method of claim 24, wherein the type of the actual enclosure is selected from the group consisting of a building, a vehicle, and an aircraft.