The concept of heat pump trigeneration is so good, why is the market not tepid?

The triple supply mentioned here is a heat pump unit that can provide three functions: air conditioning, floor heating and hot water. It is also called triple heat pump, triple air conditioner, cold heating and hot water triple supply, air conditioner floor heating and hot water triple supply, air conditioning and hot water triple supply, etc. From the perspective of central air conditioning, triple supply is also known as total heat recovery central air conditioner.

A set of systems can meet the three requirements of heating + cooling + hot water air source heat pump triple supply, not only can improve home comfort, but also reduce the initial investment of users. However, the triple-supply system has not been vigorously promoted and popular because of its advanced concept for more than ten years since its birth. Instead, it has been tepid to this day. Why on earth is this?

The root lies in the insurmountable shortcomings of the triple heat pump system, mainly due to the complex control system, high failure rate, uneven heat distribution and energy efficiency issues.

• _ulspan_ulspan_strong There are two main types of water supply switching systems in the three industries: _ulspan_span_strong_span_span_span_span_strong_span1 road.

  Among them, switching the triple supply of fluorine circuit is to realize different functions by controlling different valves.Although there is no problem with this method, the system is complicated, with too many parts and welding ports, high failure rate in operation, difficult to guarantee reliability, not to mention stability, high cost and large size, and it is inconvenient to install and maintain.

  The triple supply of switching waterways is achieved by controlling the three-way valve of the waterway to achieve different functions. This method is used more in Europe. The system is relatively simple and reliable, but the requirements for the water tank are high, which is mainly reflected in In terms of the selection of the inner coil , the processing of the water tank and the life of the water tank, at the same time, since the water tank is indirectly heated, it is not good for energy saving and the upper limit of water temperature, and the overall cost is high.

  
  

  

  
  

  • strong 35strong _span _span _span _span _span _span _span _span 1 Failures are prone to occur during operation, and only the maintenance of failures makes users and distributors extremely heady. This is also the main problem that has led to the failure to promote triple supply.
    • uneven heat distribution

    one of the core problems of the hot water distribution system is that if the hot water distribution system cannot be evenly selected, for example, if the design of hot water is not uniform, one of the core problems When it needs to be supplemented,The unit will temporarily stop the supply of cold and hot water to the air conditioning and floor heating, and restart the air conditioning and floor heating after the hot water demand is met.

    This contradiction is especially obvious when used in winter, because users need heating and hot baths at the same time in winter. The traditional triple-supply system needs to increase the unit configuration to achieve the double guarantee of heating and hot water effects.

    • Energy efficiency issues

    The advantage of switching to the hot water cooling system in summer is free. However, the temperature is very high during summer cooling. In this case, [this article source: Refrigeration Encyclopedia], the energy efficiency of the heat pump to produce hot water will also be greatly improved. Relatively speaking, the energy saving effect is not too obvious, because the hot water will not be used continuously.

    triple-supply system generally runs to ensure the bathing hot water temperature first, in summer, if the bathing hot water temperature and indoor temperature do not reach the shutdown temperature, the domestic hot water heat exchanger is used as the condenser of the air conditioner_ In span3span, when the bathing hot water runs above 35°C (because the outdoor temperature (condensation temperature) in summer is higher than the water tank temperature), the cooling conditions are energy-saving.

    Bathing hot water generally has to rise to 45℃ or even higher before stopping operation. When the temperature is above 35℃~45℃, the cooling condition is not energy-saving.

    
    

    

    
    

    • _ulspan _span1 _span1 _span1 _span1 40New water flows into the bathing hot water heat exchanger every day, which requires high corrosion resistance of the heat exchanger. Many air-energy heat pumps triple-supply units due to the corrosion penetration of the bathing hot water heat exchanger, causing water to enter the fluorine circuit The system resulted in the scrapping of the entire air energy heat pump unit.

      If you want to eliminate the problem of erosion as much as possible, the hot water in the bath needs to be a secondary heat exchange system, and the condensing temperature will inevitably increase by about 5 ℃, so that the COP value is reduced, and the gain is not worth the loss. In addition, the air energy heat pump triple supply product is far inferior to the air energy heat pump dual supply regardless of the use effect or the stability of the later system.

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