GB/T 40286-2021The performance testing method of bi-circulation unit for low-temperature waste heat recovery and utilization (English PDF)

1 Scope

This Standard specifies the performance testing method of bi-circulation unit for low-temperature waste heat recovery and utilization, including terms and definitions, symbols, test specifications, test preparation, testing, test data collation and test report.

This Standard is applicable to the performance test of bi-circulation unit for low-temperature waste heat recovery and utilization (hereinafter referred to as "the device").

The performance test of other similar devices can be performed by using this Standard as reference.

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 of the referenced document (including any amendments) applies.

GB/T 755, Rotating electrical machines - Rating and performance

GB/T 2624 (all parts), Full differential pressure device installed in a pipe of circular cross-section measuring fluid flow

GB/T 5773-2016, The method of performance test for positive displacement refrigerant compressors

GB/T 10870, The methods of performance test for water chilling (heat pump) packages using the vapour compression cycle

GB/Z 18039.1, Electromagnetic compatibility - Environment - Description and classification of electromagnetic environments

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

GB/T 37819-2019, Bi-circulation power generation unit for low-temperature waste heat recovery

GB/T 50050, Code for design of industrial recirculating cooling water treatment

4 Symbols

cp - the constant pressure specific heat capacity of the cold source or heat source medium at the average temperature, in joules per kilogram Celsius [J/(kg·°C)];

ha - the specific enthalpy of the organic working medium at the outlet of the evaporator, in joules per kilogram (J/kg);

hd - the specific enthalpy of the organic working medium at the inlet of the evaporator, in joules per kilogram (J/kg);

h1 - the inlet enthalpy value of the heat source medium on the evaporator side, in joules per kilogram (J/kg);

h2 - the outlet enthalpy of the heat source medium on the evaporator side, in Joules per kilogram (J/kg);

Kc - the heat transfer coefficient between the outer surface of the condenser and the ambient air, in watts per square meter Celsius [W/(m2·°C)];

Ke - the heat transfer coefficient between the outer surface of the evaporator and the ambient air, in watts per square meter Celsius [W/(m2·°C)];

Kf - the heat transfer coefficient between the outer surface of the auxiliary equipment and the ambient air from the evaporator to the expander and from the expander to the condenser, in units of watts per square meter Celsius [W/(m2·°C)];

Mg - the mass flow rate of the gas organic working medium and lubricating oil mixture measured by the flow meter, in kilograms per second (kg/s);

Ml - the mass flow rate of the mixture of liquid organic working medium and lubricating oil measured by the flow meter, in kilograms per second (kg/s);

Pin - the electric power input of the device, in watts (W);

Pout - the electric power output of the device, in watts (W);

Ps - the shaft power output of the device, in watts (W);

Qc - the heat release on the condenser side of the device, in watts (W);

Qc,r - the heat correction value of the condenser into the environment, in watts (W);

Qe - the heat absorption on the evaporator side of the device, in watts (W);

Qe,r - the heat correction value of the evaporator into the environment, in watts (W);

Qs,r - the total heat released to the ambient air by the auxiliary equipment from the evaporator to the expander and from the expander to the condenser, in watts (W);

qv - the volume flow, in cubic meters per second (m3/s);

ta - the ambient air temperature, in degrees Celsius (°C);

tc,m - the average value of the inlet and outlet temperatures of the cooling source medium on the condenser side, in degrees Celsius (°C);

te,m - the average value of the inlet and outlet temperatures of the heat source medium on the evaporator side, in degrees Celsius (°C);

tf - the average surface temperature of auxiliary equipment from the evaporator to the expander and from the expander to the condenser, in degrees Celsius (°C);

t1 - the inlet temperature of the heat source medium on the evaporator side, in degrees Celsius (°C);

t2 - the outlet temperature of the heat source medium on the evaporator side, in degrees Celsius (°C);

t3 - the inlet temperature of the cooling source medium on the condenser side, in degrees Celsius (°C);

t4 - the outlet temperature of the cooling source medium on the condenser side, in degrees Celsius (°C);

alphaf - the surface heat transfer coefficient of auxiliary equipment, in watts per square meter in degrees Celsius [W/(m2·°C)];

deltaf - the thickness of the thermal insulation material on the surface of the auxiliary equipment, in meters (m);

etaout - the thermoelectric conversion efficiency;

etas - the thermal efficiency;

lambdaf - the thermal conductivity of the thermal insulation material on the surface of the auxiliary equipment, in watts per meter Celsius [W/(m·°C)];

rho - the density of cold source or heat source medium at average temperature, in kilograms per cubic meter (kg/m3);

omega - In the mixed solution of organic working fluid and lubricating oil, the mass ratio of organic working fluid and mixed solution.

5 Test regulations

5.1 When testing the device, two different methods shall be used to measure at the same time, defined as Method X and Method Y, respectively. See 7.3 for the selection principles of Method X and Method Y.

6 Test preparation

7 Testing

8 Test data collation and test report