Air source heat pump new market - infant swimming pool hot water supply

Infant swimming pool more common in cities, people’s living standards gradually increased after an emerging product. Swimming pool has a professional swimming pool, you can provide just enough comfort for the newborn child’s hot water swimming experience. The opening of a family of infants and young children’s swimming pool, but also to the relevant industrial chain began to be active. Among them, the air source heat pump hot water market as an important device, also ushered in the new development opportunities.

Air-source heat pump by a lot of infants and young children’s swimming pool owner to fancy, there are several reasons, the first to say is safe. Normally, equipment for supplying hot water to buildings includes oil-fired boilers and coal-fired boilers. Both of these facilities have an open flame during the heating process, posing a potential safety hazard. For infants and young children’s swimming pool this place has a demanding safety requirements, it is not so suitable.

Air source heat pump driven by electric energy, through the refrigerant absorbs heat in the air to produce hot water. Heating process, do not consume any fuel, natural gas, the flame does not appear to burn, so completely eliminate fire hazards. Heat pump heat exchanger also uses water and electricity separation design, but also reduce the probability of leakage of equipment at the root causes, has become the safe patron saint of the babies.

Then analyze the cost of air-source heat pump heating costs. In Guangzhou, there are quite a few cases of using the air source heat pump to heat the baby swimming pool. The author has obtained a detailed data from the list below. A baby swimming pool installed a 5P air source hot water unit. The installation cost of the project is about 20,000 yuan or so, which is about 8,000 yuan higher than the nearby swimming pool that uses oil-fired boiler heating.

However, in the subsequent use, the energy-saving effect of air-source heat pump gradually highlights. The use of oil-fired boiler heating, daily consumption of about 30L of fuel consumption, oil prices at 6.7 yuan / liter basis, the daily operation cost of oil-fired boilers over 200 yuan. Air source heat pump, as it is taken from the air, the daily power consumption is only about 20 kWh, commercial electricity price of 1.5 yuan / kWh, count down, heat pump daily operating costs only tens of dollars, far below the oil-fired boiler .

With the increase of newborns, air source heat pumps will also come one after another in the next few years in the market a small outbreak.

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.

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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