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eLibrary > BS EN 14750:2024 Railway applications. Air conditioning for urban, suburban and regional rolling stock: Comfort parameters and type tests >

BS EN 14750:2024 Railway applications. Air conditioning for urban, suburban and regional rolling stock: Comfort parameters and type tests, 2024

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BS EN 14750:2024 Railway applications. Air conditioning for urban, suburban and regional rolling stock: Comfort parameters and type tests, 2024

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1 Scope
2 Normative references
3 Terms and definitions
4 Parameter selection
5 Vehicle categories
6 Comfort parameters
7 Exterior conditions [Go to Page]
7.1 Generalities
7.2 Mean exterior temperature range with comfort criteria
7.3 Mean exterior temperature range with functional criteria
8 Performance of the heating and cooling installations [Go to Page]
8.1 Design passenger load
8.2 Heating
8.3 Pre-heating
8.4 Cooling
8.5 Pre-cooling
8.6 Stand by operation
9 Control [Go to Page]
9.1 General
9.2 Interior temperature setpoint (Tic)
9.3 Interior temperature setpoint (Tic) for vehicles without cooling
10 Comfort condition requirements [Go to Page]
10.1 Requirements for comfort zone [Go to Page]
10.1.1 Quality regulation for steady-state tests [Go to Page]
10.1.1.1 Range of the mean interior temperature (Tim) with the respect to the interior temperature setpoint (Tic) for steady-state tests (ΔTi)
10.1.1.2 Range of variation of mean interior temperature (Tim) for steady-state test (∆Ti10)
10.1.2 Quality of regulation for regulation tests [Go to Page]
10.1.2.1 Door cycling sequence
10.1.2.2 Changing interior temperature setpoint (Tic)
10.1.2.3 Changing test parameters
10.1.3 Horizontal range of the extreme interior air temperatures (ΔTH)
10.1.4 Vertical range of the extreme interior air temperatures (ΔTV)
10.1.5 Temperatures of the surfaces surrounding the comfort zone
10.1.6 Relative humidity for air-conditioned vehicle (RHim)
10.1.7 Air speed (AS)
10.2 Requirements for local annexes (TLoc)
10.3 Air quantities and quality [Go to Page]
10.3.1 Outside air or fresh air
10.3.2 Smoking areas
10.3.3 Toilet
10.3.4 Particle air filtration
11 Complementary requirements [Go to Page]
11.1 Heat transfer coefficient (k) [Go to Page]
11.1.1 General
11.1.2 Standstill coefficient k of the vehicle
11.2 Condensation
11.3 Solar factor (g) of the windows
11.4 Sealing against water and snow
12 Validation [Go to Page]
12.1 General
12.2 Test levels
12.3 Selection of tested vehicles
12.4 Assessment of comfort criteria based on simulation [Go to Page]
12.4.1 Introduction
12.4.2 Comparison between test and simulation of the reference case
12.4.3 Vehicle validated by simulation
13 Preliminary verifications
14 Air movement tests [Go to Page]
14.1 General remarks
14.2 Air flow rates
14.3 Visualization of the air flow direction
14.4 Air speed test [Go to Page]
14.4.1 Critical air speed
14.4.2 Measurement of air speeds
15 Climatic tests [Go to Page]
15.1 General remarks
15.2 Pre-heating test [Go to Page]
15.2.1 Test level TL1
15.2.2 Test level TL2 and TL3
15.3 Pre-cooling test [Go to Page]
15.3.1 Test level TL1
15.3.2 Test level TL2 and TL3
15.4 Regulation test
15.5 Steady-state tests
15.6 Tests at extreme exterior operating conditions
15.7 Complementary tests [Go to Page]
15.7.1 Determination of the coefficient k [Go to Page]
15.7.1.1 Purpose of the test
15.7.1.2 Procedure
15.7.2 Thermography
16 Methods of measurement − Measuring instruments [Go to Page]
16.1 General remarks
16.2 Temperatures [Go to Page]
16.2.1 Air temperature
16.2.2 Surface temperatures
16.3 Relative humidity
16.4 Air speed
16.5 Air flow rate
16.6 Simulated speed of the vehicle
16.7 Equivalent solar energy
16.8 Energy consumption and power rating
17 Characteristics of the test equipment [Go to Page]
17.1 General remarks
17.2 Occupation
17.3 Temperature and uniformity of the climatic chamber and climatic wind tunnel
17.4 Relative exterior humidity
17.5 Simulation of exterior air speed [Go to Page]
17.5.1 Standstill tests
17.5.2 Dynamic tests
17.6 Equivalent solar energy [Go to Page]
17.6.1 General
17.6.2 Solar load calculation
17.6.3 Window area
17.6.4 Wall area
17.6.5 Roof area
18 Distribution of measuring points [Go to Page]
18.1 General
18.2 Comfort envelope temperature measuring points
Annex A (normative)Form for parameters selection
Annex B (normative)Regulation curves for the interior temperature setpoint
Annex C (normative)Acceptable air speed
Annex D (normative)Maximum Relative interior humidity in the comfort envelope
Annex E (normative)Heat emitted by a person
Annex F (normative)Exterior conditions for climatic zones
Annex G (normative)Fresh air flow [Go to Page]
G.1 General
G.2 Vehicles with air conditioning installation [Go to Page]
G.2.1 Fresh air flow design
G.2.2 Fresh air flow regulation
G.2.3 Free cooling
G.3 Vehicles with only heating and ventilation
Annex H (normative)Test programme for TL1
Annex I (normative)Test programme for TL2 and TL3
Annex J (normative)Equivalent solar energy (Simulation of solar exposure)
Annex K (normative)Location of the measuring points used for the determination of the mean interior temperature in the comfort envelope (Tim), horizontal (ΔTH) and vertical (ΔTV) range of the extreme interior air temperatures, floor surface temperature (TS_Fl), relative interior humidity (RHim), interior CO2 concentration (Cim) in the comfort envelopes and local annexes
Annex L (normative)Location of the measuring points used for the determination of surface temperatures [Go to Page]
L.1 Floor (measurement of TS_Fl)
L.2 Windows pane (measurement of TS_Win_Pa)
L.3 Side wall (measurement of TS_Wal)
L.4 Door (measurement of TS_Do)
L.5 Seat (measurement of TS_Seat)
L.6 Comfort zone with a length higher than 25 m
Annex M (normative)Location of other sensors
Annex N (informative)Coefficient k
Annex O (normative)Calculation method of the comfort level CL [Go to Page]
O.1 General
O.2 Example of usage of this methodology:
Annex P (informative)Simulation
Annex Q (normative)Set-up of the simulation
Annex R (informative)Abbreviations [Go to Page]
R.1 Surface temperatures: TS__Range_Surface concerned
R.2 Airflow: V̇_Type of airflow
R.3 Range of temperature: ΔT_Location
R.4 Comfort level and simulation
R.5 Solar load calculations
R.6 Other [Go to Page]

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