Electric Water Heater Laboratory Technical Solution

Project Overview

The energy efficiency laboratory of the electric water heater is designed and constructed according to the following standards and specifications:

1-1 Product test standards:

IEC 60379 Performance test method for domestic water storage electric water heaters

SASO 1858

1-2 measurement and control accuracy of each parameter

Measurement points and accuracy

Control points and accuracy

1-3 laboratory capabilities

This laboratory is a basic laboratory dedicated to the energy efficiency test of electric water heaters. The following tests can be performed under experimental conditions:

1.24h energy consumption coefficient

2. Hot water outlet rate detection;

3. Heating experiment

4.Input power experiment

5. Insulation time test;

6. Power consumption experiment

7. Water consumption experiment

8.High temperature and high humidity test

9.Low temperature test

10.Other performance testing items required in the electric water heater standard

1-4-1 Tested machine type:

l Hanging electric water heater, vertical electric water heater, fast-heating electric water heater.

l 1-4-2 Detection capability:

l Can test 6 household electric water heaters at the same time.

l

l Second, the infrastructure plan:

2.1 Performance (energy efficiency) laboratory:

l l Laboratory room: length × width × height: 6800mm × 3800mm × 3200mm; (using high-density 100mm rock wool insulation board inside the double-sided color steel plate, and using non-combustible or flame-retardant materials, the grade of material combustion performance reaches A level);

l lLaboratory door: height × width: 2200mm × 1200mm, double-opening door, with observation window on the door, lighting with Philips tri-proof fluorescent lamp (top-mounted installation), the illuminance measured at a height of 1m above the ground shall not be less than 400lx;

llGround: Foamed 3mm stainless steel floor, good insulation and non-slip performance;

l Access control: with access control system.

Working conditions: 1) Temperature: adjustable from 10 ° C to 50 ° C, steady state change rate ≤ ± 0.3 ° C / 10h, horizontal temperature unevenness ≤1 ° C, vertical distribution gradient ≤0.6 ° C / m; 2) humidity: 40% --- 85% RH, stability ± 3%, accuracy is + 1%; 3) wind speed: no obvious convection, wind speed ≤0.25m / s.

Environmental temperature and humidity control measures:3.1 Refrigeration and heating system:

l Refrigeration: water-cooled units, the integrated design of the refrigeration unit, plastic sprayed fully enclosed unit cover, corrosion resistance, beautiful. Able to withstand the harsh environmental conditions of severe cold and extreme heat.

lThe refrigeration system adopts the normally open working mode, and the outdoor unit of the refrigeration system has anti-vibration and noise reduction measures.

lHeating: When the fan stops working, heating can be stopped, with overheating protection, and the heating tube can be easily replaced.

lAir duct: The air duct is designed reasonably and beautifully, and the inlet air and the return air are down. The components of the air duct are reasonable and easy to maintain.

l Defrosting: The system can be equipped with an automatic defrost function.

l The heating tube can be easily replaced;

3.2 Humidification system

lHumidification water tank is made of stainless steel

l The water tank has automatic water level control function, water shortage and overflow protection functions;

l Humidifier electrode heating, convenient for regular cleaning and drainage functions, and take insulation measures;

l Party A supplies water supply and drainage pipes to the humidifier position;

3.3 Temperature and humidity adjustment system

Temperature and humidity control instrument: Temperature and humidity controller: Japan SR93, RS485 communication; Seamanton solid state relay;

lTemperature and humidity measurement: adopt high-precision PT100 platinum resistance sensor, dry and wet bulb method to measure temperature and humidity;

lTemperature and humidity control: temperature, humidity and wind speed control: indoor refrigeration and heating are achieved by refrigeration units, evaporators, humidifiers, heating pipes, aluminum alloys, return air ducts, air-conditioning fans, etc., and the heating pipe pairs For indoor heating, both parties use the non-overshooting PID algorithm to complete the precise control of indoor temperature, and control the equipment to complete manual or automatic control of heating, presses and fans. Humidification and dehumidifier cooperate with the control to achieve laboratory humidity control. The air duct of the air-conditioning laboratory is designed as a central discrete air inlet, and a lower return air is a base air duct with an air outlet. The inlet and return air fans are designed to form a closed-loop air path to ensure laboratory temperature and humidity control. The refrigeration unit, evaporator, and air-conditioning fan are used to achieve the indoor temperature of the air-conditioning laboratory through the aluminum alloy return air duct.

3.4 Protective measures: Refrigeration and air-conditioning equipment must have phase sequence protection, overcurrent protection, high and low voltage protection, running water protection, overtemperature protection, smoke alarm, water shortage protection, anti-dry burning protection, etc., and sound and light alarm devices, and Emergency power off if necessary.

3.5 Others: In addition to the electric water heater performance laboratory, the sampling (type inspection) laboratory, reliability laboratory and parts laboratory all use central air conditioning to control the temperature.

Ø ØBasic functions of the water system: It has basic functions such as pretreatment, water storage, pressurization, voltage stabilization, automatic inlet, drainage, heating, cooling, and heat preservation, as well as conventional safety protection such as low water levels, spillage, and important electrical components and power. The alarm and protection functions of the abnormal operating status of the components, each laboratory corresponds to a relatively independent and shared water supply system.

Ø Ø Constant temperature water tank: The laboratory is equipped with a 2000L water tank. Each water tank has a stirring function. The water tank has a mechanical display and a control cabinet meter to display the water volume function. At the same time, the water tank design is convenient for internal cleaning and maintenance. The tank material is made of highly polished 304 stainless steel.

Ø ØWater temperature range: the water tank has independent heating and cooling capacity, and the temperature can be adjusted and controlled within the range of 10 ℃ -35 ℃;

Ø Ø Water pressure: The pipeline pressure is stable, and the pressure tank is set. All stations are turned on and the maximum flow is entered at the same time. The maximum design water pressure is 1.2Mpa. The system sets the water pressure and the water pressure at the water outlet of the station. The water pressure is kept consistent, and the pointer of the outlet of the pipeline is designed to install a pointer pressure gauge

Ø ØWater flow: Under the water pressure of 0.3Mpa, the outlet water flow of the stand is ≥20L / min, and each outlet is equipped with a joint and a valve;Ø

Ø Ø Insulation and heat insulation capacity: All water supply pipes and water tanks should have insulation and heat insulation capabilities to prevent water dripping in summer and freezing in winter;

Ø Ø Water tank temperature control: The deviation between the set water temperature and the actual outlet water temperature of each water tank is less than 1 ° C. After reaching the set temperature, stable control during daily operation is guaranteed. The temperature fluctuation range does not exceed the set value ± 2 ° C. Accurate, fast response temperature sensor and collect and save to the test curve;

Ø ØAutomatic water inlet and drainage capacity: The water inlet and drainage of each water tank are equipped with two types of automatic control and manual control. Soft water and tap water can be automatically added to set the amount of water and drainage through the display of the control cabinet. The inlet and drainage flow is greater than 100L / min;

Ø ØRemote operation and monitoring capabilities: On the panel of the control cabinet, parameters such as water temperature and water pressure can be set, and heating, cooling, circulation pumps, pressure pumps, water inlet pumps, and drainage pumps can be opened and closed. Water volume, actual water temperature, actual water pressure, instantaneous flow, total flow, etc .;

Ø Ø Safety protection ability: The water tank has a protection design for overflow, leakage and low water level, and the heating pipe and refrigeration unit have low water level protection, low temperature and high temperature protection, etc.Ø

Ø Ø The water system should have good reliability and maintainability. Common spare parts (solenoid valves, hand valves, etc.) for water systems need to be configured at least twice the standard configuration. The water system pipelines are reasonably beautiful and the pipelines are clear. Identification, hanging identification plate, convenient for maintenance and maintenance, equipped with water hardness testing reagent and water hardness adjusting reagent that can meet the 3 year usage;

Ø ØMaterial components of water system :All the above water tanks, pumps, water pipes and other pipe fittings are made of 304 stainless steel, which guarantees that there will be no water rust or water leakage in the service life of more than 10 years.

Ø ØMain components of water system: constant temperature water tank, refrigeration system, pipeline heater, booster pump, circulating water pump, pipeline solenoid valve, temperature sensor PT100, pressure sensor, flow meter, etc.

Constant temperature and pressure water supply system:

1. Water temperature is controllable, range: 6 ~ 60 ℃ ± 0.5 ℃ (in the water inlet pipe), usually 15 ~ 25 ℃, it can be set, and the water temperature accuracy adjustment range should be adjustable within the range of ± 0.5 ℃ to ± 5 ℃;

2. Water pressure range: 0.02MPa ~ 1.2 MPa ± 0.05MPa can be adjusted arbitrarily. Commonly used water pressures are 0.2MPa, 0.275MPa,0.4MPa, 0.6MPa, 0.7MPa, 0.8MPa, 1.0 MPa;

3. Real-time display of working water pressure;

4. Water supply: The maximum water supply is 2T / h, which can be arbitrarily adjusted within the range of 0 ~ 40L / min and can be constant (using imported Grundfos booster pump, Italian VAREM voltage regulator, EMERSON or Mitsubishi inverter, Germany Luke pressure sensor, imported from Japan Yokogawa water flow meter) with water flow indication, commonly used flow rate 2L / min, 5L / min, 10L / min, maximum water supply 3T / h;

5, water supply tank 2000L water supply tank, automatic control of water intake, automatic water level control;

6.With various protection functions such as water shortage, water level, over temperature, leakage, etc.Each test position is equipped with a set of faucets. Each set of faucets is equipped with a copper G1 / 2 "ball valve to provide constant temperature and pressure water circulation to ensure that the water temperature meets the requirements;

Drainage system:

Drainage: Drainage adopts dual-pipe drainage: one of the pipes is drained to a recyclable water tank. The drain recovery method uses the pressure of the constant pressure pipe to discharge hot water from the water heater to the recovery water tank, and also injects constant temperature water into the experimental machine. After the experiment, part of the water in the water heater needs to be naturally discharged to another set of drainage pipes to the sewer, without recovery.

Laboratory workstation design

5.1 Electric water heater performance (energy efficiency) laboratory:

Converter power station: two three-phase three-phase three-phase inverter power supply; capacity: 45kVA / unit; voltage 230V / 415V (single-phase 5-300V adjustable), accuracy ± 1%; frequency: 47-63Hz adjustable , 50Hz, 60Hz fixed, 2F (2 times), 4F (4 times), 400Hz (optional), accuracy ± 0.05%; waveform distortion: ± 3%.

Test hanger:

1) 2 rows, single-sided hanging, 3 stations per row, near the side wall of the laboratory, size 1200mmX900mmX2000mm;

2) Material: Steel frame structure + 18 matte black matte paint, bearing 500kg / station;

3) Hook: stainless steel (with insulation pad), left and right can be moved (adjustable spacing), and the height of the hook is moderate;

4) Test corner plate: at least one stand in each room has a test corner plate;

5) Bench meter box: placed pressure, electrical parameters, flow rate, inlet and drain temperature (1 each / work station), front glass window for easy observation, and back metal door for easy maintenance;

6) Water supply pipeline is PPR pipeline, with insulation layer, 1 set of valves and joints per station;

Data collection:

• Electrical parameter tester: The accuracy of electrical measuring instruments should be no less than + 0.5%, the accuracy of measuring instruments for measuring energy consumption is 0.01KW.H, and the accuracy of measuring instruments for measuring time is + 1s / h. 1 set, can display voltage, current, power, energy consumption, time, frequency, etc., on-site display + data acquisition, network transmission + computer processing, storage on-site display + data acquisition, network transmission + computer processing, storage;
• Temperature inspection instrument, 15 thermocouples at each station in the laboratory, each station is equipped with two armored platinum resistors; on-site single-channel cycle display + data acquisition of all channels, network transmission + computer processing, storage; cooperate with E Type filament thermocouple (accuracy within 0.5K), armored platinum resistance for measurement, accuracy 100 degrees error is not greater than 0.2 degrees
• Each station has an electromagnetic flowmeter, integrated into the pipeline, on-site display, network transmission + computer processing, storage, adjustable flow rate of 2-20L / min, level 5 accuracy.
• Pointer pressure gauge (1.6MPa), installed on the pipeline, displayed on the spot; electronic pressure sensor, data acquisition, network transmission + computer processing, storage;
• The integrated measurement and control system handles the collection, analysis, processing, reporting and storage of various data; it can dynamically enable each station to be inspected; the adjacent station sensors can be dynamically combined.

Software system functions

System security

After-sales service and technical training programs

1. Commitment to product warranty period, after-sales service and service system

1.1 Product Warranty Period Commitment

The company promises that the products provided to the buyer are designed and manufactured in accordance with the requirements of the bidding documents, and the configured components are also purchased and configured according to their requirements. For this reason, we are fully responsible for this quality!

The company promises to provide new, unused and qualified products to the buyer. The products provided by the company are subject to the Three Guarantees (repair, replacement, and return) period. The specific period can be found in the warranty time limit list.

During the three-guarantee period, if the user fails to use the equipment in accordance with the operating instructions during normal use, all maintenance costs will be borne by supplier; outside the three-guarantee period, the supplier will implement lifelong tracking maintenance and repair for the product.Will charge the cost of repair and replacement parts.

Laboratory warranty commitment