Fault Analysis of Air Source Heat Pump Water Heater
Valve Ultra-Thin Ball Valve,Industrial Ultra-Thin Ball Valve,Thread Globe Valves,Threaded Swing Check Valve ZHITONG PIPE VALVE TECHNOLOGY CO.,LTD , https://www.ztongvalve.com
Abstract: Looking at the current domestic air-source heat pump hot water unit project application examples, most of the problems are mostly concentrated in less than 1 year of installation, from the point of view of water are mostly concentrated within 10 tons of water within a single or two More units. Keywords: air-source heat pump hot water unit application failure analysis solution Looking at the current domestic air-source heat pump hot water unit project application examples, most of the problems are mostly concentrated in the installation of less than 1 year, from the water point of view and most Focus on 10 tons of water within a single unit or two more. Host issues, control issues, tank design issues and more. Enough to affect the user's confidence in the use of air source heat pump, the long run is bound to affect the promotion and application of excellent products. As the professional manufacturer of air source heat pump hot water unit, Jinan Longpu New Energy Co., Ltd. is also one of the earliest manufacturers to conduct research and development and application of heat pumps in China. Considering the overall situation of industrial development, Jinan Changpu New Energy Co., Ltd. is now prone to appear bad products in the heat pump market The failure and the reasons for focus analysis. And proposed a solution for the majority of businesses in the future to pay attention to business. Also called for the manufacturers in the industry to work together to correct the industry unhealthy atmosphere, to avoid the application of the air source heat pump hot water unit in the hands of mercenary figure, so that the development of air source heat pump hot water unit out of the mud, back to the right. Symptoms 1: Set the water temperature or temperature rise slow. However, some engineering units run longer than the design time is still not reach the water temperature, only barely direct use of hot water or even can not be used, the measured temperature is about 40 or lower, the system ring pump kept ring, the temperature did not increase . Diagnosis 1: air source heat pump hot water unit water temperature is generally set at 50 ℃ ~ 60 ℃, and occasionally higher than 60 ℃ at 65 ℃ below the allowable range, but operating conditions may affect the life of the unit. The rise in water temperature must get heat from the outside world. When the water tank temperature does not go there will be two possible, on the one hand the heat loss or equal to the influx of heat, when the two are equal, the water temperature unchanged. Loss of heat also includes two possibilities, one is the insulation is not enough quality and the temperature difference between the natural world is too large, heat loss is serious, especially the water tank manhole seal is not strict insulation is not good or hidden insulation part did not do well, the external takeover insulation and the box Discontinuous insulation will increase the heat loss; another loss of heat for the hot water out at the same time cold water supplement. This loss of heat often appear in the design of the tank, and some customers require 24 hours of uninterrupted water, such as passenger traffic larger hotels, haircut and other water customers, cold water rushed into the tank, ready to use hot water . In the air source heat pump hot water unit is not a problem, once the weather suddenly cooled, the unit doubled from the calorie in the air to reduce, while customers increased the amount of hot water, then left in the tank of heat is not enough, On the performance of the water temperature rise difficulties, and even cold water phenomenon. On the other hand, it may be that the host refrigerant has poor heat carrying capacity, resulting in less effective heat exchange within a single cycle. One of them may be improper refrigerant selection. The air-source heat pump hot water unit is different from the traditional air-conditioning refrigerant, and has unique physical and chemical stability. This is also one of the core heat pump technologies. Part of the heat pump products using the market, the refrigerant does not have this feature, in the case of lower temperatures outside the case of fatigue is not surprising. Another possibility is that the charge of the refrigerant is small or partially leaked and becomes less capable of carrying heat. Formal manufacturers of air-source heat pump hot water unit products constant pressure quantitative plus refrigerant, have been tested by the factory one by one to ensure that the host of the compressor in a variety of conditions have a more stable ability to work. The same batch of units to test the status of a single test, to mark the certificate, date of manufacture, number and so on. In the transport of products, there are cases of not moving according to the label, so that part of the refrigerant leak missing, not work, will result in water temperature reaches the design of the water temperature. Prescription one: According to our diagnostic analysis should first check to see if daily water consumption is excessive, 1kg of water per 1kg of domestic water absorption 1Kcal absorption of heat equivalent to 1.163 × 10-3KWh, 1000Kg water up 1 degree, the need to absorb 1.163KWh of heat. The calculation formula is as follows: water quantity (tons) × temperature difference ℃ × 1.163 / unit power Kw × COP value ≤ design working time (hours), for example: cold water temperature is 15 ℃, outlet water temperature is set at 55 ℃, unit power 2.2KW, In winter, when the ambient temperature is low, the COP value is about 2 (data released by the manufacturer of the product) and the designed water consumption is 1 tonne. The working time of the unit is 11 hours. The maximum working time of design is 20 hours. 2 tons, the working hours of the unit is 22 hours <24 hours maximum allowable working time and 3 tons of water under the same working conditions, auxiliary heating or unit configuration should be considered. If there is no problem with the unit configuration, the water circulation between the stand-alone and the water storage tank can be cut off to start the unit to detect the heat collection capacity of the single machine. If the temperature does not reach the highest temperature on the nameplate, the refrigerant may be a problem. Check the refrigerant pressure, control the factory data sheet, if the pressure is insufficient, the performance of the refrigerant loss. According to the original model refrigerant added to the factory standard quantity can be. Symptom 2: Unit working time is too long, more than 24 hours of continuous operation, power consumption greatly exceeded the business to the customer's budget, the cost increases or estimated to use the valley price concession plan meaningless, customers on the air source heat pump hot water unit trust Discounted, and even proposed cost compensation. Unit over-long working hours caused by overloading power distribution components work and waterways? Ring increased, is bound to lead to a series of chain system problems. Diagnosis II: air source heat pump hot water unit engineering unit shutdown control by the controller, the unit working time is too long because there is no system shutdown parameters set, such as temperature parameters. The temperature sensor near the water supply port, the detection temperature below a certain range of set value when the unit opens; higher than the set temperature of a certain value, the unit stopped. Exclude the refrigerant with poor heat capacity and setting the temperature is too high and other reasons, then there may be temperature sensor failure or sensing circuit short circuit, circuit breaker led to shutdown. Because air source heat pump hot water unit making hot water is a ring heating process, which belongs to the thermal storage hot water equipment, considering the temperature is low, the air heat is reduced, the unit a single ring to obtain less heat, the unit COP value Decline will make the working time of the unit lengthened. In order to avoid the unit matching "small cart pulled cart", to ensure that the unit within 24 hours to obtain sufficient heat, the rated amount of water heating, taking into account the summer unit COP value increases, the system Take hot water capacity, the normal design work time is generally 10 to 15 hours, but from the reality of view, a serious problem of the proportion of units have unreasonable situation in the face. Take the unit with input power of 4kW as an example, when used in Guangdong, proper water distribution should be 3 tons of water. Even when the winter air temperature is extremely low, the COP average is calculated as 2 and the unit works for 17.5 hours 60 ℃ hot water requirements, the actual configuration of some projects with water more than 5 tons, it is no wonder the unit can not be down for a long time. Voltage over and under may also be shut down failure fault, but this situation is less, because under normal circumstances, the unit has the factory before the factory set high and low voltage compressor to protect against voltage over, owe and start running damaged compression machine. A long time non-stop crew there may be a compressor is bad, intermittent operation of the fan unit caused by the illusion of non-stop, this situation is rare, the general heat pump set for the fan bearing power compressor will not run alone . Prescription 2: First check whether the voltage meets the operating requirements of the unit. When there is no voltage problem, check whether the compressor is operating normally and eliminate the illusion of the unit running caused by idling of the fan. Determine the matching of water consumption and unit is appropriate to exclude due to continuous into the cold water temperature and temperature drop caused by increased workload of the unit, check the control system of the sensor line with or without failure, to be excluded. Symptom 3: Unit crashes, unable to start. When the temperature drops below 0 ℃, the whole system will enter the shutdown state, even if the temperature rises, still can not start running, or outside the machine fan rotation, the compressor stops working. Diagnosis 3: The unit stop running mainly due to the control system, one by one to check the set of protection parameters, such as water temperature control circuit, the system can not be collected in the signal will not start, because the unit is turned on by the heat exchanger temperature and set The temperature of the water tank and the set temperature are jointly controlled by the three parameters. When the temperature of the collected water tank is lower than the set temperature, the unit starts to start. When the water temperature in the heat collecting part is higher than the temperature of the water tank, Hot water tank temperature can not collect data, the unit self-protection does not start. In addition the voltage is too low too high, the refrigerant leak, the compressor low pressure protection or compressor has broken, etc. can cause the unit can not boot. Cold water pressure is not enough, the water tank fill water, the unit will not protect the start. Prescription three: first check the compressor for damage, with a multimeter to measure the compressor resistance, confirm the compressor without failure, the focus of inspection of the control system, control unit factory manual or engineering system design acceptance report, according to the analysis of the inspection circuit, waterway, Temperature setting parameters and measured data, identify non-compliance and correct accordingly. Solenoid Valve control Sheung Shui, check the sensitivity of the water level sensor and the size of the water pressure to determine the problem is not the water level data. Symptoms four: refrigerant ring pipe burst, the refrigerant is lost, the machine paralyzed. Performance for continuous work or start a period of time, the outdoor host becomes larger noise, the local refrigerant cycle back to the pipe cracks, and then the refrigerant missed, the pressure test to zero. Sometimes fans can rotate, no change in water temperature, multimeter test compressor resistance is minimal. Condenser part of the pipe burst, water infiltration refrigerant pipe caused by compressor damage. Diagnosis 4: refrigerant medium circulation pipe burst, the main cause of the refrigerant is completely leaked circulation system pressure becomes larger than the pressure range of refrigerant circulation pipeline. Due to the weather cooling system to take the same amount of heat, the compressor to do more work, the refrigerant phase transition point pressure becomes larger, due to inadequate thickness of copper parts or welding unqualified burst. In another case, the water quality is not clean, and impurities such as iron filings, sand particles and the like leak along the long-term wear of water circulation resulting in leakage of heat-exchanging copper pipes, especially in the case of large-pipe heat exchange mode. It is rare to see the squib due to aqueous pH or fouling. Prescription 4: First of all, to find out whether the main cause of water quality problems can be filtered or electronically treated to improve water quality. Project installation is completed, according to the requirements of flushing the pipeline, if necessary, but also on the pipeline passivation. Explosion caused by the refrigerant should confirm whether the unit operation within the scope of the manufacturer's product design allows the working conditions. Check the welding port and the connection port for cracks, repair welding or re-connection. Burst in the expansion valve to the condenser to the compressor, usually due to improper refrigerant selection or excessive dosage. Formal brand manufacturers produced by manufacturers, each model must go through rigorous testing and testing, with a variety of conditions in the simulation of destructive testing, to determine the refrigerant charge amount. The manufacturing process, such as the implementation of ISO900 quality system, strict procurement management to ensure that the various components