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GB/T 18431-2014 English PDF (GBT18431-2014)

GB/T 18431-2014 English PDF (GBT18431-2014)

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GB/T 18431-2014: Steam and hot water type lithium bromide absorption water chiller

This Standard specifies the terms and definitions, types and basic parameters, requirements, test methods, inspection rules, marking, packaging and storage of steam and hot water type lithium bromide absorption water chiller.
GB/T 18431-2014
NATIONAL STANDARD OF THE
PEOPLE REPUBLIC OF CHINA
ICS 27.200
J 73
Replacing GB/T 18431-2001
Steam and Hot Water Type Lithium Bromide
Absorption Water Chiller
ISSUED ON: JUNE 24, 2014
IMPLEMENTED ON: DECEMBER 21, 2014
Issued by: General Administration of Quality Supervision, Inspection and Quarantine;
Standardization Administration of the PEOPLE Republic of
China.
Table of Contents
Foreword ... 3
1 Scope ... 4
2 Normative References ... 4
3 Terms and Definitions ... 4
4 Types and Basic Parameters ... 5
5 Requirements ... 6
6 Test Methods ... 8
7 Inspection Rules ... 11
8 Marking, Packaging and Storage ... 12
Appendix A (Normative) Test Methods for Refrigerating Capacity ... 14
Appendix B (Normative) Calculation Method of Heat Loss Rate of Unit ... 19 Appendix C (Normative) Determination Method of Pressure Loss ... 21
Appendix D (Normative) Technical Requirements of Lithium Bromide Solution ... 23
Appendix E (Normative) Requirements for Cooling Water and Supplementary Water Quality ... 24
Steam and Hot Water Type Lithium Bromide
Absorption Water Chiller
1 Scope
This Standard specifies the terms and definitions, types and basic parameters, requirements, test methods, inspection rules, marking, packaging and storage of steam and hot water type lithium bromide absorption water chiller (hereinafter referred to as "unit").
This Standard is applicable to steam and hot water single-effect and double-effect units for central air conditioning and technology.
2 Normative References
The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition (including all the amendments) applies.
GB 151 Tubular Heat Exchangers
GB/T 13306 Plates
GB 18361 Safety Requirements of Lithium Bromide Absorption Water
Chiller (Beater)
GB/T 18430.1-2007 Water Chilling (Heat Pump) Packages Using the Vapor
Compression Cycle - Part 1: Water Chilling (Heat Pump)
Packages for Industrial and Commercial and Similar
Application
JB/T 4330-1999 Determination of Noise Emitted by Refrigerating and Air
Conditioning Equipment
JB/T 7249 Refrigerating Equipment - Terms
3 Terms and Definitions
For the purposes of this document, the terms and definitions established in JB/T 7249 and the following ones apply.
Pa???m3/s.
5.2.2 Hydraulic pressure test
All parts at the cold water side, cooling water side and heat source side of the unit shall be free from abnormal deformation and leakage.
5.3 Nominal condition performance
5.3.1 Refrigerating capacity
The refrigerating capacity of the unit shall not be less than 95% of the nominal refrigerating capacity.
5.3.2 Consumption of heat source
The consumption of heat source in specific refrigerating effect of the unit shall be in accordance with those specified in Table 1, and shall not be greater than 105% of the indicated value (when 95% of the indicated value of the unit is less than the value specified in Table 1).
5.3.3 Consumed electric power
The consumed electric power of the unit shall not be greater than 105% of the indicated value.
5.3.4 Coefficient of performance (COP)
The coefficient of performance of the unit shall not be greater than 95% of the indicated value.
5.3.5 Water-side pressure loss
The pressure loss of cold water and cooling water of the unit shall not be greater than 110% of the indicated value.
5.4 Variable working condition performance
The unit shall be able to work normally within the range specified in Table 2, and shall be subjected to variable working condition performance test according to interval value.
Table 2 -- Application Scope
Parameter Nominal condition Application scope Interval value
Outlet temperature of cold water/??? 7 5~10 1
Inlet temperature of cooling water/ ??? 32 24~34 2
Steam single-effect Steam pressure/MPa 0.1 0.08~0.12 0.01
shall be dried with compressed air.
6.2.1.2.2 When the heat source side is designed and manufactured according to GB 151, hydraulic pressure test shall be carried out according to the requirements of GB 151.
6.2.2 Performance test under nominal condition
6.2.2.1 Refrigerating capacity
Test shall be carried out according to Appendix A under the nominal condition specified in 4.3.
6.2.2.2 Consumption of heat source
In the refrigerating capacity test, consumption of heat source is determined. If insulation construction is not performed for unit during the test, the unit heat loss shall be obtained according to Appendix B; the consumption of heat source shall be corrected according to Appendix A.
6.2.2.3 Consumed electric power
When refrigerating capacity test is carried out, the input electric power of the unit shall be determined.
6.2.2.4 Water-side pressure loss
The unit operates under nominal condition; after the determination of refrigerating capacity becomes stable, the pressure loss of unit at cold water side and cooling water side shall be determined according to Appendix C.
6.2.3 Test under variable working conditions
The unit is subjected to test under variable working conditions by changing certain parameter separately according to the application scope and interval value specified in Table 2 with other conditions kept as those under the nominal condition; the test results shall be plotted into curve or compiled into table.
6.2.4 Partial load test
Under the partial load condition specified in 5.5, refrigerating capacity and corresponding consumption of heat source shall be determined according to Appendix A.
6.2.5 Noise test
The unit operates under nominal condition and is subjected to noise measurement 8 Marking, Packaging and Storage
8.1 Marking
8.1.1 Permanent nameplate shall be set at the obvious position of each unit; the nameplate shall meet the requirements of GB/T 13306 and its contents shall include: a) Name and trademark of manufacturer;
b) Product model and name;
c) Main parameters (refrigerating capacity, outlet temperature of cold water, cold water flow capacity, inlet temperature of cooling water, cooling water flow, heat source parameters and consumption, power supply, etc.);
d) Factory number of product;
e) Manufacture date.
8.1.2 Delivery document
Each unit shall be accompanied with the following documents:
a) Quality certificate, which shall include:
1) Product model and name;
2) Factory number of product;
3) Inspection conclusion;
4) Inspector's signature or seal;
5) Inspection date.
b) Installation and operation instructions, which includes:
1) Product model and name;
2) Structural diagram, electrical diagram and wiring diagram of product; 3) Installation instructions and requirements;
4) Operating instructions and precautions of repair and maintenance.
c) Packing list.
8.2 Packaging
In Formulae (A.2)~(A.5):
Qi - the heat consumption of heat source, kW;
qms - the steam consumption, kg/h;
hs1 - the specific enthalpy of steam, kJ/kg;
hs2 - the specific enthalpy of condensation water, kJ/kg;
qvk - the volume flow of hot water, m3/h;
Ck - the specific heat capacity of hot water at mean temperature, kJ/(kg??????); ??k - the density of hot water, kg/m3;
tk1 - the inlet temperature of hot water, ???;
tk2 - the outlet temperature of hot water, ???;
L - the heat loss rate of unit calculated according to Appendix B.
A.5.3 Heat discharged by cooling water
The heat discharged by cooling water shall be calculated according to Formula (A.6): Qw=(1/3 600)qvwCw??w(tw2-tw1) ?€??€??€??€??€?.?€??€??€??€??€??€??€??€??€??€??€??€? (A.6)
Where,
Qw - the heat discharged by cooling water, kW;
qvw - the volume flow of cooling water, m3/h;
Cw - the specific heat capacity of cooling water at mean temperature, kJ/(kg??????); ??w - the density of cooling water, kg/m3;
tw1 - the inlet temperature of cooling water, ???;
tw2 - the outlet temperature of cooling water, ???.
A.5.4 Heat balance checking
The heat balance deviation of unit shall be calculated according to Formula (A.7): 100%C i w
Q Q P Q
?€? ?€? ?€???? ?€? ??? ?€??€??€??€??€?.?€??€??€??€??€??€??€??€??€??€??€??€? (A.7)
Appendix B
(Normative)
Calculation Method of Heat Loss Rate of Unit
B.1 Calculation of heat loss
The heat loss of unit shall be calculated according to Formulae (B.1) and (B.2): Q0=Ah(t0-ta) ?€??€??€??€??€?.?€??€??€??€??€??€??€??€??€??€??€??€? (B.1)
Q1=A(t0-ta)/(1/h+??/??) ?€??€??€??€??€?.?€??€??€??€??€??€??€??€??€??€??€??€? (B.2)
Where,
Q0 - the heat loss prior to insulation construction, kW;
Q1 - the heat loss after insulation construction, kW;
A - the surface area, m2;
h - the surface heat transfer coefficient, kW/(m2???K), take h=11.6??10-3 kW/(m2???K); t0 - the surface temperature, ???;
ta - the environment temperature, ???, ta=20???;
?? - the thickness of thermal insulation material, m;
?? - the thermal conductivity coefficient of thermal insulation material, kW/(m???K). B.2 Calculation of heat loss rate
B.2.1 The heat loss rate of unit shall be calculated according to Formula (B.3): 0 1
Q Q
?€??€? ?€??€??€??€??€?.?€??€??€??€??€??€??€??€??€??€??€??€? (B.3)
Where,
L - the heat loss rate;
Q0 - the heat loss prior to insulation construction, kW;
Q1 - the heat loss after insulation construction, kW;
Qi - the heat consumption of heat source, kW.

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