How to choose a wonderful heat pump water heater

The composition and function of heat pump water heater
Air source heat pump water heater is composed mainly of two parts: First, air source heat pump main unit, also known outside host machine, and its shape and structure essentially same as the outdoor unit of the air conditioners, mainly composed by the compressor and the evaporator. Heat exchange between Medium and the air by the host machine, media will quickly evaporate vaporization absorbs heat in the air, which is the essence of eletricity saving of heat pump water heater . Second, the tank of heat pump water heater, it’s functions similar to the other type water heater tank, hot water is reserved, but the structure and size is different, there are different length brass hovering in the internal air source heat pump water heater tank, high temperature medium flowing through the copper tube to exchange heat between high temperature working fluid and water in the storage tank.

Meanwhile, heat pump water heater tanks are generally pressurized liner, you can ensure that when the water pressure sufficient to carry out the central heating water. In addition, between the tank shell and the liner is made of high density polyurethane foam for the constant temperature constant pressure quantitative treatment, to ensure good insulation effect, is the best insulation method.

Different power of air source heat pump water heater
Air source heat pump water heater, under the same refrigerant and compressor and configuration and same technology and other related circumstances hosts, the power greater, the heating faster, more efficient and convenient in use. Power consumption will not cause the difference, because the same amount of heat required to heat hot water is same value, the difference is how long to make water hot, of course, the prices of large power machines more highter than the small power. Many friends have mistakenly thought that the machine will result in large power consumption increases, which is a recognition on the small errors.

Applicable specifications of heat pump water heater.
 Everyone’s habit of using hot water is not the same! Some people like to bath water tap has been open all the time, some people click on the red smear soap or shower gel and other toiletries, so that a big diffience. And some people take a bath time is very short, only a few minutes, but some people it is necessary to fully enjoy the fun of bath, time to reach more than 30 minutes. Usually a shower with hot water about 30-40 liters of water, take a hot bubble bath 80-100 liters. Three to four people small household if only take shower, 100 liters water tank capacity is enough to use; five or six people household 150 liters water tank is enought; while the family have a bathtub at least 200 liters of water tanks used to meet, home heat pump storage tank there are 260 l water tank, 320 liters, 400 liters capacity of 500 different upgrades. But in fact we will use water when more than calculated, because there is no washing, laundry and other areas with hot water into account. Modern standard of living has been greatly improved than in the past, and with hot water good for health promotion but also accepted by the majority of people, affect our hot water use from an objective view. If the family’s economic condition is fine, we recommend using bigger water heater. Capacity are mentioned here refers to the actual water tank capacity, to deduct insulation thickness, however, many brands of air source heat pump water tank nominal capacity is not real, the calculation is very simple cylinder volume (area square multiplied by the height).

Technical parameters of heat pump water heater
About the compressor of the air source heat pump water heater, the air source heat pump water heater designed to achieve high efficiency, and stable and durable. Air source heat pump water heaters are generally required to use brand-name compressor, because the key to a good quality compressor core technology in the foreign manufacturers are more well-known manufacturers, quality and service guaranteed. A good quality products it needs is a good composite indicator, we know the composition of the heat pump compressor, a control system, there is the evaporator, a condenser, a water tank, a steel material, a welding process, a sheet metal process , there must be follow-up professional installation and quality service to form a good quality product. If anyone thinks they have a healthy heart is healthy on the identification, it is very ridiculous! In addition to heart because you, you have other body systems and organs; the central nervous system, a brain, a limb, there are facial features, there are internal organs, and bones, etc., any system or organ lesions so that people can not be called healthy.

The water tanks of air source heat pump water heaters

The water tank in air source heat pump water heater is core part,the inner ladder is key technic to water tank water tank is very important to air source heat pump water heater, not only affects the operation of air source heat pump water heater.more important is to determine the longevity of air source heat pump water heater.

Three materials: no one is perfect.
The water tanks of air souce heat pump water heaters, there are three major categories accroding to material and technic: stainless steel inner ladder, enamel inner ladder, crystal inner ladder.

1. Stainless steel liner is a second-generation water tank to replace the galvanized sheet, view the current industry industry conditions, the longest period of time on the market, the most group used, and chosen by most clients. SUS304 stainless steel is the best stainless steel liner material, anti-corrosive, is the choice of most manufacturers.

The biggest technical difficulty of the stainless steel liner is the corrosion and crack problems based on Welding position, the original corrosion resistance will be lost when stainless steel plate welding under high temperature.The stainless steel liner have to bear the working pressure when being used, coupled with the impact of heating expand and cooling contract, leakage is never avoid.Rusting and leakage phenomenon have occurred, serious affect the development of air source heat pump water heater.

2. The enamel interior is the third-generation after stainless steel,its unique advantages: Pressure resistance, strain resistance, acid resistance, alkali resistance, High temperature resistance, water vapor ressitance, non-polluting.

Of course, the enamel liner is not the perfect choice,huge weight,difficult to transfer. Once there is broken enamel. It is difficult to find out, liner ladder rust immediately damage the quality of the water tank.

3. The third type water tank products is crystal interior. Crystal Liner is similar to the enamel interior, which is also called "slush liner. Crystal interior is also in the plate "Boring" on a layer of material. This material similar to the plastic or resin material, and thus be able to successful isolation from the plate and water, to prevent the steel plate rust corroded.

Crystal inner is almost the same performance with enamel interior, but better than enamel interior, lighter than enamel,not so vulnerable, easy to transport and water storage tanks more bigger. At the same time, crystal interior not affected by thermal expansion and contraction of the impact will not lead to crack and leaking, it will not affect the thermal conductivity and water quality due to scaling.

But doubt have never been stopped within the crystal inner material is easy to fall off, and material aging cause water to smell ", technical questions of crystal inner need to be solved and proven.

Although the tank water is so important to air source heat pump water, but the whole market focus on the the development of main unit. Stainless steel, enamel interior crystal liner, there is a long time for their development.

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The market analysis of ordinary and Detian air source water heater

 1, “Three high” problems. Air source heat pump water heater is a high automatic machine as the "human being ", judge one people whether physical health and longevity, we should check whether this people’svarious parts of his body is in working normally. There are three phenomena were high (high blood pressure, high blood glucose, high blood fats), air source heat pump water heaters also have the "three high" phenomenon (high exhaust tempertature, high pressure, high running current). If a machine a long period of "three high" operation is bound to affect the running machine operation and longevity.

1.76KW water heater operation parameters of the thermal cycling machine table (heating cycle from 40 degrees to 55 degrees machine operating parameters values)

	Normal value	Detian air source water heater	Ordinary air source water heater
Exhaust	90-95 degrees	85 degrees	100 degrees (exhaust lead to abnormal failure easily)
Pressure	1.8-2.5MPA	2.2MPA	2.7MPA (lead to abnormal high pressure fault easily)
Running current	8A	8A	8.8 ~ 9A (the current exceeds the rated current show that the compressor work overload, damage the compressor logevity)

2, The low utilization ratio of hot water in tank

Ordinary air source heat pump water heater storage tank, supply hot water depends on water pressure , that is, the cool water coming into while the hot water forced to come out of the water tank , so cold water will mixed with hot water at the same time filling into the water tank, thermal efficiency is very low. Hot water utilization ratio less than 50%.

Detian R & D team take the above problems as a research subject, it took nearly three months to finally solved this problem, developed a new thermal storage tank, and obtained national patent. The new patented water tank, separated the hot water and cool water successfully through a special design, solved the mixing problem, making the water utilization rate up to 80-90%.

3, Severe frosting in winter, heating capacity is very low, can not guarantee regular supply of hot water.

Ordinary air source heat pump water heater does not fundamentally solve the frost problem, their solution is to stop heating water, converting the refrigerant flow direction, with 5-10 minutes will stay in the frost on the evaporator block melt away.

Detian air source water heater technology R & D team developed the anti-frost evaporator  which solved this serious problem. Assure user have enough hot water to use, the machine work stablely in winter.

4, immersion copper corrosion problem of leakage fluorine

Common way is to heat the water just heat exchanger immersed in the tank directly. The heat exchanger is made of copper, copper for a long time to be immersed in the water heater where corrosion perforation over time, leakage of fluorine. Lead scrap tanks, machine paralysis.

Detian technical team invented a high efficient cellular beam tube heat exchanger. It’s main feature is large exchange area, high efficence. The heat exchange used in Detian’ls main unit which solved the long-term immersion in water, copper pipe corrosion problems, could heat water normally below10 degrees.http://www.fsdetn.com/

Ordinary air source heat pump water heater due to technical constraints, can not solve the three-high problem, Detian technical experts breakthrough technology limitations, has been completely solved the"three high" problem. How to cycle In the high-temperature: want to know more, please call us.

How to maximize the energy-saving of air source heat pump water heater?

Now we popularize energy saving products favored by consumers. Air source heat pump water heaters accepted by consumers by it’s energy saving, safety, environmental protection, etc. Although the air source heat pump water heater is a very energy-efficient products, but if the the unit match, installation, warm-keeping and other aspects of the design unreasonable, then, make energy-saving effect greatly reduced.

1.Heat pump unit and water tank.

It is very important to Match the host and the water tank. Take residential type for example: a small tank with a large host, make the investment cost too large, an increase of one-time investment costs, but the host reduced working hours, have greatly prolonged the life of the host; a small host with large tank, this configuration can reduce costs, but the host will be significantly lengthened, it will affect the longevity of the host. For example, There is big difference in price between 0.75KW host with 300L water tank and 1.57KW host with 300L water tank. As a result, the small host working time significantly longer especially in the winter.

So that will need electric auxiliary, many users feel the electricity costs almost same as electrical water heater. Therefore, electricity auxiliary in water tank, can reduce one-time cost, but the costs will be increased, not only lose their energy-saving effect, but also compromise the securit. In fact, household heat pump in the case of a reasonable match will not use electricity auxiliary.Such as 0.75KW with 100-150L water tank, 1.57KW units with 200-500L water tank, so that both prolong the life of the host really achieve the use of heat pump water heaters energy saving, environmental protection, safety performance.

2 heat pump projcet installation.

Engineering, installation methods also affect the energy saving effect of the heat pump. There is two different way from the use, one is 24 hours supply and another is regular water supply, 24 hours supply is mainly used in hotels, hospitals and other places, regular supply is mainly used in schools, factories and other places

Regular water supply installation is simple. Just need two circulation pipes to heat between host and water tank, hot water after a particular time used up then re-add cold water into water tank to be reheated. This installation method is very energy-efficient.

There is more ways installation for 24 hours supply, such as direct thermal, cycle type and big small water tanks.

Direct thermal type is cold water turn into hot water after passing through the host directly, the water temperature can reach between 45-65 ℃. This principle is to control the filling water through a throttling device, water flow can not fill the entire heat exchanger, so must consider the diameter of the heat exchanger not be too big to go through, repeated testing must be done to select the most reasonable diameter.

Cycle heating is the water in water tank heated by cycling, will fill up the water tank with cold water after checking automaticly there is not enough water, and then re-cycle to reach the setting termperature, this installation is relatively easy.

Big/small water tank: small water tank heated to be a certain temperature, then move all the water from small water tank to big water tank, fill up small tank with cold water, continuous cycle, until the large tank filled with hot water. This method in the control relatively complex, but not a high temperature heating phenomenon like a cycle heating in the host. Therefore, the energy saving effect is relatively high.

3.Business project warm-keeping.

There is Pipe and tank insulation. There are two kinds of insulation in water pipe insulation cotton or polyurethane foam. Small diameter generally use cotton insulation, large tubes use polyurethane foam insulation. In the lower ambient temperature, the temperature drop was particularly severe, if there is backwater system, but not warm-keeping to water supply pipe and back water pipes, energy efficiency will be drastically reduced. Tank insulation is also important, stainless steel water tank insulation under normal circumstances, with 5mm of polyurethane foam insulation layer, and then outside of the insulation layer and a layer of stainless steel. So the warm-keeping effect of water tank is also good.

In conclusion, it is no doubt about the energy-saving of air source heat pump water heater, but there are factors of matching, installation, warm-keeping, will affect the energy saving. So must pay more attention on above questions, can make the air source heat pump water heater performance excellent.

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