Air Source Water Heater in Winter Maintenance Knowledge

    

With the winter coming, the air source water heater in the home also want to the winter. To do a good maintaince for air to water heat pump can ensure you have a warm water in winter.

1. switch wind valve
 if you don't need the kitchen air conditioning when weather cold, please switch three-way reversing valve, wind will air exhaust to the outside.Specific operation method is as follows (except flagship) :

2. Set the target temperature
Send mode setting of the machine in the standard heating mode.Usually used in winter bath water temperature for 42 ℃, at this time recommend to set the goal of air conditioning water heater temperature of 55 ℃, so can not only ensure the comfort of hot water, and can meet the demand of hot water supply.When water consumption increases in the home, need to set the target temperature, which can fully meet the demand of the water heater.

3. Check the air inlet for the leaves sundry
Check whether the air inlet unimpeded, if has some stuff  plug the air heat pump, please clean it in time.

4. Periodic blowdown
The effect of pressure relief valve is to protect the water tank, when the water tank internal water pressure is too large, the valve will automatically pressure drainage, thus protecting water tank.
Suggest user 3-6 month to pull the valve handle regularly, 3-4 times in a row, each time for about 5 seconds, to ensure that the body can normal pressure.In the process of the pressure relief occasionally with "buzzing" sound, at the same time have the water out, it belongs to the normal phenomenon.

5.  To choose reasonable boot time
Air source water heater is by absorbing heat from the air heating, the higher the temperature of the air, the higher the heating efficiency, therefore, the user can according to the local temperature changes, choose the best time to boot operation to reduce power consumption.Generally speaking, in the winter, the highest temperature during the 13 to 15 points at noon, then start the air can water heater heating, can shorten the heating time, reduce power consumption.

6. Hot and cold don't panic
If users in the use of hot water, hot water faucet in the condition of the hot and cold, should pay attention to whether multiple hot water faucet to provide hot water at the same time, on the premise of tap water supply pressure is constant, at the same time open multiple hot water faucet, can reduce the hot water pressure, a hot water hot and cold conditions;If there is no open at the same time more hot water faucet, and circulating water tank installation, need to check whether circulating water tank water of the one-way valve damage, one-way valve damage also blows hot and cold hot water could be happening, change the one-way valve can be repaired.

The Main Technical Points of the Air Source Heat Pump Compressor

In the actual system design, also want to follow the rules of the heat pump running, give full play to the function of the special heat pump compressor.Specific attention should be paid to the following aspects:

1, throttling device to ensure the wide range
Both fission and the integral heat pump water heater in the open air, the evaporation temperature are very wide.In order to effectively throttling in wide range, it is suggested that do not use single capillary, but USES the expansion valve or more groups of capillary, in response to the change of environmental temperature, ensure that under all operating conditions have a suction superheat.At the same time also to avoid the liquid directly into the compressor, especially in the winter.

2, the observation liquid strike, dip phenomenon, to assess risk

For static heating heat storage type heat pump water heater, the refrigerant migration is bypassing the problem: after the compressor stop working, in the condenser at a high temperature environment, compressor/evaporator cooling, temperature difference in cold media gradually migrate to the evaporator and the compressor.

Cold media "gather", compressor starts again, gathered at the refrigerant in the evaporator is likely to go into the compressor.That is to say, heat pump water heater in liquid impact degree is more serious than air conditioning.This phenomenon has been verified through many experiments.It is also a special heat pump compressor adopts accumulator design one of the reasons why the super capacity arc (ease liquid impact, improve suction superheat).Therefore, in the development of heat pump water heater, need to see liquid strike, dip phenomenon, to assess risk.

3. Pay attention to the bottom of the compressor from the problem of heat
It is easy to be ignored during system design, but it is extremely important.The so-called heat at the bottom of the compressor, it is defined as: temperature, condensation temperature at the bottom of the compressor.If the value is zero or less than zero, compressor ontology has become a "condenser" at this time, cold media will slowly in compressed casing in condensed liquid and deposited at the bottom of the compressor, regarded as "lubricating oil" to the compressor pump body each sliding surface.Liquid refrigerant is no lubrication function, as a result, the compressor pump body friction abrasion dual comprehensive, happen " seizuring locked-rotor" is just a matter of time.

Compressor running in winter, in the event of "breathe in liquid", into the liquid refrigerant compressor internal quickly reduces the compressor body temperature, and low environmental temperature, leading to the bottom of the compressor temperature will drop too low.And heat pump water heater due to the need for making high temperature of hot water, the condensation temperature is higher, it is easy to occur at the bottom of the compressor temperature is lower than the phenomenon of condensation temperature.System experiments showed that when have a suction liquid occurs, in preparing 55 degrees, the hot water temperature at about 5 degrees occurs at the bottom of the superheat phenomena of less than zero, the more serious the environmental temperature is lower.

4.  condensation side heat transfer set aside safety margin
No matter what type of heat pump water heater, after running for a long time, the water side of the heat transfer (condensing side) effect will decrease (scale, loose, aging, etc.), heat transfer temperature difference will increase.So did you consider in the design the condensation side heat transfer temperature difference might happen in the future how to change, to set aside a safe margin, to ensure the safety of the compressor to run for a long time in scope.

High temperature heat pump technology explanation and application field

High temperature heat pump heating water temperature can reach 80 ℃ over the heat pump.The limitation of air source heat pump hot water output from all closed compressor and refrigeration oil loss lubricity, freon coking and motor insulation damage, etc.On the market at present is most of the air source heat pump using R22 as a working medium as well as the general condition of the compressor.

As working medium of thermodynamic properties and chemical properties and general condition of R22 compressor's adaptability, it is hard to out of the water temperature up to 55 ℃ or more.This is because the normal working condition of the compressor can withstand the highest evaporation temperature to the director of the 12 it (if the evaporator inlet is 20 ℃ the evaporator outlet for 16 ℃, then according to the degree of superheat 4 considering the evaporation temperature of 12 ℃, the limit of the allowed by compressor), the largest compressor under pressure 24 kg, RR2 condensing pressure is reached at 60 ℃ condensing temperatures 24 kg.So this kind of heat pump work scope: evaporator water less than 20 ℃, condenser water not more than 55 ℃.

For high temperature heat pump cycle working medium, compressor, system form, heat exchanger optimum design, lubricating oil system and no non-condensable gas treatment has obvious particularity.To its application and research must be to choose the suitable working medium, and then is suitable for the design of the compressor and satisfy the working medium work unit and intelligent control system, etc.

Japan in the 1980 year was carried out by the heat pump project, 4 kinds of heat pump developed, including the use of more than 45 ℃ hot water, in the hot water temperature of 85 ℃ high temperature heat pump, and the use of more than 80 ℃ hot water and output 150 ℃ high temperature heat pump of steam.Europe is by improving the performance of centrifugal compressor technology route of high temperature heat pump, using everything refrigerants, triple eccentric compression mode, heating water temperature can reach 85 ℃.

The emergence of high temperature heat pump, greatly expand the application field of heat pump, can be directly recycled more than 20 ℃ ~ 55 ℃ low grade (waste heat) resources, make 65 ℃ ~ 90 ℃ hot water, and used for heating, heating oil, industrial insulation, production with hot areas such as alternative fuel, gas, coal-fired boiler, can save a lot of primary energy, has the very good energy saving and environmental benefits of high temperature heat pump especially in the aspect of industrial heat, steam boiler, waste heat recycling, building heating, high temperature baking food and other industrial products of high temperature baking, etc. Above 80 ℃, the basic reach the design standard of the heating in the north, so the high temperature heat pump can be used as common building heating of the heat source and heat source.

Low Temperature Air Source Heat Pump Working Principle and Characteristics(1)

1. The working principle of low temperature air source heat pump

Air source heat pump units by the evaporator, condenser, compressor and expansion valve four main parts form a closed system, which filled with the right amount of working medium.Unit operation principle is based on inverse circulation principle: liquid working substance in the first place in the evaporator absorbs heat from the air and steam evaporation formed (evaporation), latent heat of vaporization is reclaimed by heat, and then by the compressor compressed into high temperature and high pressure gas, into the condenser condensed liquid (liquid) need to absorb heat heating water, liquid working substance after decompressional expansion of the expansion valve back on expansion valve, absorbing heat evaporation and complete a cycle, so on, constantly absorbing the low temperature water source of heat and heat output, directly to the expected temperature. 

2. The characteristics of low temperature air source heat pump

A.  Safety 

Because it is not used directly heated by electric heating element, the relative electric water heater, to eliminate the leakage of the security hidden danger;Relative gas water heater, no gas leak, or safety concerns, such as carbon monoxide poisoning, thus has more excellent safety performance.

B. Comfortable 

Air source heat pump is regenerative, function according to the temperature of the tank heating or air conditioning load start automatically, to ensure adequate supply 24 hours hot water, air-conditioning loads, heating hot water won't appear like a gas water heater can't satisfy the multiple problems with hot water faucet, at the same time also won't appear electric water heater capacity is small, many people take a shower to wait.Out-of-the-box hot water, large water yield, water temperature stability, meet all your expectations of hot water. 

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