GB/T 40008.1-2021Performance evaluation and calculating method for water heater system—Part 1: Household and similar water heater system (English PDF)

Foreword

GB/T 40008 "Hot Water Preparation System Performance Evaluation and Calculation Method" is planned to be divided into the following three parts.

---Part 1: Household and similar hot water production systems;

---Part 2: Low ambient temperature heating and hot water preparation system;

---Part 3: Multi-energy complementary heating and hot water production system. This part is Part 1 of GB/T 40008.

This section was drafted in accordance with the rules given in GB/T 1.1-2009.

1 Scope

This part of GB/T 40008 specifies the performance evaluation method and calculation method of the hot water preparation system.

This section applies to heat pump water heaters, gas water heaters (gas instant water heaters, positive displacement gas water heaters), electric water heaters (water storage Type electric water heaters, quick-heating electric water heaters) as heating equipment, household and similar hot water production systems for the purpose of providing hot water (to Hereinafter referred to as "system").

Other heat source equipment or hot water preparation systems can be used as reference.

This section does not apply to solar water heaters and composite water heaters that use solar energy and other heat source equipment.

2 Normative references

The following documents are indispensable for the application of this document. For dated reference documents, only the dated version applies to this document. For undated reference documents, the latest version (including all amendments) is applicable to this document.

GB 6932-2015 Domestic gas instantaneous water heater

GB 18111-2000 Gas storage water heater

GB/T 20289-2006 Storage type electric water heater

GB 20665-2015 Domestic gas instantaneous water heaters and gas heating water heaters energy efficiency limit values and energy efficiency grades

GB 21519-2008 Energy efficiency limit values and energy efficiency grades for storage-type electric water heaters

GB/T 23137-2008 Household and similar heat pump water heaters

GB/T 26185-2010 Fast heating electric water heater

GB 29541-2013 Heat pump water heater (heater) energy efficiency limit value and energy efficiency grade

GB/T 33757.1 Energy Saving Rate of Distributed Cooling, Heating and Electric Energy System Part 1: Fossil Energy Drive System

CJ/T 336-2010 Condensing household gas fast water heater

3 Terms and definitions

GB 20665-2015, GB 21519-2008, GB 29541-2013, GB/T 33757.1 and the following terms and definitions Applies to this document.

4 Annual heating energy utilization rate

In a year, the ratio of the total heat of hot water required throughout the year to the total final energy input into the hot water production system converted into primary energy is calculated by Calculation of formula (1) and formula (2). Where.

eta s ---The ratio of the heat generated by the water heater to the converted heat of the primary energy consumed, the primary energy generation rate is calculated at 35%, The unit is kilojoules per kilojoule (kJ/kJ).

Wj --- The amount of hot water used by the household and the total hot water heat energy required per day, refer to Appendix A or test and determine according to the actual situation of the user; Table B.1 The total hot water energy required per day when the daily average temperature is tj, in accordance with the provisions of Appendix B, the unit is kilojoules per day (kJ/d).

nj --- the number of days when the daily average temperature number tj occurs in Table B.1, see Appendix B, the unit is day (d).

Wloss---The heat leakage loss of the water tank, the storage water heater is in the heat preservation stage after each heating, due to the existence of the heat leakage phenomenon of the water tank The heat loss caused by the rapid heating (direct heating) water heater tank leakage loss is zero, and the unit is kilojoules per day (kJ/d), see attached Record D.

a --- Primary energy conversion factor. Take 1 if the energy consumption is gas, and take 35% if the energy consumption is electric (primary energy power generation) rate).

eta ---The heating efficiency of the water heater. Heat pump water heaters have annual heating performance coefficient (AHPF, determined according to Appendix C), water storage type Electric water heaters are determined according to GB/T 20289-2006, fast heating electric water heaters are determined according to GB/T 26185-2010, household Gas instantaneous water heaters are determined in accordance with GB 6932-2015, and condensing household gas instantaneous water heaters are in accordance with CJ/T 336-2010 Confirmed, gas volumetric water heater is determined according to GB 18111-2000.

Pe --- The electrical power of auxiliary equipment when the gas water heater is in use, in kilowatts (kW).

hj --- The heating operation time of the water heater, in hours (h).

Tj,i,1---represents the actual hot water termination temperature when the water heater is running at the target termination temperature (41°C or 55°C) under the ambient temperature tj, single The position is in degrees Celsius (°C).

Note 1. Subscript j. corresponding to the ambient temperature interval j in Table B.1; subscript i. specified end water temperature (according to the provisions of this section, i is equal to 41 or 55); subscript 1.use When it means that the temperature is the end of heating, it is distinguished from the end temperature of the heat preservation in the formula (D.1) [Equation (D.1) replaces 1 with 2, which means the end of heat preservation].

Note 2. Due to experimental and control deviations, the actual hot water termination temperature cannot all be exactly 41°C or 55°C.

Tj,c --- the cold water temperature when the average daily temperature is j, in degrees Celsius (°C).

c --- The average specific heat capacity of water, the value of this formula is 4.187, the unit is joule per kilogram degrees Celsius [J/(kg·°C)].

Qj ---The heating capacity of the water heater with temperature number j. The heat pump water heater is determined according to Appendix C, and the storage electric water heater is according to GB/T 20289- Determined in 2006, fast-heating electric water heaters are determined according to GB/T 26185-2010, and household gas-fired fast water heaters are determined according to GB/T 26185-2010.

Determined by GB 6932-2015, condensing household gas instantaneous water heaters are determined according to CJ/T 336-2010, gas volumetric type The water heater is determined according to GB 18111-2000, and the unit is watt (W).

5 System heating conversion coefficient and water tank leakage heat loss test method

5.1 The amount of hot water used by the household and the total hot water energy required per day are determined by referring to Appendix A or testing according to the actual situation of the user.

5.2 The heat pump water heater (heater) shall be tested according to the test procedures of GB 29541-2013, GB/T 23137-2008 and the working conditions of this part. Try the plan.

5.3 The gas water heater shall be maintained in accordance with the test procedures of the heat load test specified in GB 20665-2015 and GB 18111-2000 and the working conditions of this part. Seeking to determine the test plan.

5.4 The 24h inherent energy consumption test of electric water heaters according to GB 21519-2008, GB/T 20289-2006, GB/T 26185-2010 The steps and working conditions in this section require the determination of the test plan.