BS 4856-2:1975
Current
The latest, up-to-date edition.
Methods for testing and rating fan coil units, unit heaters and unit coolers Thermal and volumetric performance for cooling duties: without additional ducting
Hardcopy , PDF
English
30-09-1975
Co-operating organizations
Foreword
Methods
1 Scope
2 References
3 Definitions
4 Nomenclature
5 Objects of the tests
6 Limitations of accuracy of the test method
7 Testing conditions
8 Steady state conditions
9 Instrumentation
10 Test equipment
11 Air temperature measurements
12 Primary fluid measurements
13 Test facility
14 Thermal rating: results and analysis
15 Air volume flow rate measurements
16 Enclosure sweating tests and condensate disposal
tests
17 Electrical rating test
18 Psychrometric test method
19 Air volume flow measurement for psychrometric test
method
20 Rating tests (psychrometric test method)
21 Examples (psychrometric test method)
Tables
1 Steady state conditions
2 Enclosure swear test conditions
3 Sensible cooling test series
4 Sensible and latent colling test series
5 Calculation of sensible cooling duty at room
temperature of 25 deg C
6 Results for example of sensible and latent cooling
Figures
1 Thermometer pockets
2 Multi-junction differential thermocouple
3 Inverted U-tube manometer
4 Shields for thermometer and thermocouple
5 Air sampling tubes
6 Air flow chamber
7 Chilled fluid test equipment
8 Piezometer ring
9 Extended air flow chamber
10 Room temperature measuring stations
11 Inlet temperature measurement
12 Water temperature correction factor KW
13 Determination of air flow rate
14 Example of recirculation correction factor
15 Heat transference
16 Rating example
17 Primary fluid plus metal thermal resistance
Coolers as used for cooling and dehumidifying under frost-free conditions, the medium used being water or other heat transfer fluid (excluding volatile refrigerants).
Committee |
RHE/6
|
DevelopmentNote |
Supersedes 73/34046 DC. (07/2005) Reviewed and confirmed by BSI, December 2012. (11/2012)
|
DocumentType |
Standard
|
Pages |
36
|
PublisherName |
British Standards Institution
|
Status |
Current
|
Part 2 of this British Standard deals with methods of carrying out thermal and volumetric tests of unit coolers without additional ducting. The unit coolers operate with or without condensation on the coils. The unit coolers are of the type used for cooling and dehumidifying purposes under frost-free conditions of operation. The cooling medium used is water or other heat transfer fluid (excluding volatile refrigerants). The range of approximate air volume flow rates is between 25 × 10–3 m3/s and 5 m3/s.
The tests are to be carried out on units in an essentially clean condition.
This standard applies to units having operating temperatures of primary fluid within the range 0 °C to 27 °C.
The primary fluids used are; water, brine, glycol, heat transfer fluid.
The minimum temperature differential (see 14.2) of the primary fluid under test is 3 °C.
There is no restriction on the mounting of these units for testing provided that they are tested whilst mounted in a way representative of their intended use.
The standard specifies performance characteristics that are to be obtained from a unit. Although the requirements of the methods for individual tests may be followed to determine the performance of a unit at one specified set of conditions, where the performance at conditions other than those of the actual test are to be stated the full schedule of tests specified in the standard have to be made.
BS 4856-4:1997 | Methods for testing and rating fan coil units, unit heaters and unit coolers Determination of sound power levels of fan coil units, unit heaters and unit coolers using reverberating rooms |
BS 4856-4:1978 | Methods for testing and rating fan coil units, unit heaters and unit coolers Acoustic performance; without additional ducting |
BS 3763:1976 | The International System of units (SI) |
BS 4856-1:1972 | Methods for testing and rating fan coil units, unit heaters and unit coolers Thermal and volumetric performance for heating duties; without additional ducting |
PD 5686:1978 | The use of SI units |
BS 1042-1:1964 | Measurement of fluid flow in pipes. Orifice plates, nozzles and venturi tubes. |
BS 4194:1967 | Recommendations on the design requirements and testing of controlled-atmosphere laboratories |
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