Combined heating of solid heat storage and air source heat pump

1. How the device works

1.The working principle of solid heat storage equipment

Composition of 1.1 solid heat storage equipment: high-voltage power supply system; electric heating element; high-temperature energy storage body; high-temperature heat exchanger; heat output controller; high-temperature insulation shell and automatic control system.

The working principle of the 1.2 is: in the preset power grid trough period or the wind power abandonment period of wind power generation, the automatic control system turns on the power switch, the power grid supplies power to the electric heating body, and the electric heating body converts electric energy into heat energy and is continuously absorbed by the high-temperature energy storage body. When the temperature of the high-temperature heat storage body reaches the set upper limit temperature or the power grid trough period ends or the wind power generation, the power supply stops supplying power, and the electric heating element stops working. The high-temperature heat accumulator is connected to the high-temperature heat exchanger through a heat output controller, and the high-temperature heat exchanger converts the high-temperature heat energy stored in the high-temperature heat accumulator into hot water, hot air or steam for output.

1.3Main Technical Innovation Points of Heat Storage Equipment

High Density Thermal Storage Technology

Independent research and development of high density and high heat capacity heat storage materials resistant to high temperatures above 1500 ℃, and made into high temperature heat storage bodies. This high-temperature heat storage body is processed and formed by a reasonable ratio of magnesium oxide material, and is qualitatively and shaped after high-temperature sintering; it has the advantages of small size, large heat capacity, strong heat storage capacity, stable performance, and stable heat release.

Hydropower separation technology

Using the original water and electricity separation technology, there is no direct correlation between the high-temperature heat storage body and the hot water output device. Since the power supply heating circuit and the heat storage body are not integrated, but separated from each other, this separation is sufficient Ensure the safe operation of the equipment in various occasions and solve the problem of high-voltage insulation.

In addition, the power energy storage technology has successively solved the problem of variable power output and voltage automatic micro-

Technical problems such as control and safety protection.

2.Working Principle of Air Source Heat Pump

The air source heat pump unit is a central air-conditioning equipment with air as the cold and heat source and water as the cooling (hot) medium to meet the annual cooling and heating needs of the building.

The working principle is similar to that of a water source heat pump. The air source evaporator absorbs the heat of the air, which is the difference between the air source and the water source. It is a high-tech product that extracts low-grade heat energy in the air and converts it into high-grade heat energy according to the principle of reverse Carnot cycle. Consumes a certain amount of electric energy, sucks the low-temperature heat in the air from the low-temperature side to the high-temperature side, and converts the low-grade heat energy into high-grade heat energy.

Because the air source heat pump absorbs the heat of the outside air, the temperature of the outside air is greatly affected by the external environment and is lower than the temperature of the water source, so the energy efficiency ratio of the air source heat pump is lower than that of the water source heat pump. In the absence of water resources, air source heat pump is the preferred equipment for heating.

The air source heat pump is composed of a compressor, an evaporator, a condenser, a condensing air, and an electronic expansion valve.

Compressor : This unit adopts an internationally renowned brand fully enclosed scroll compressor, which has high efficiency, low noise, stability and reliability. The refrigeration system design with double compressors and double circuits has strong standby and small starting current. The first compressor of each unit is started one by one, and the second compressor is started after all starts, which makes the unit more efficient. The equipment is equipped with crankcase heater and perfect control and protection device to ensure safer operation of the unit.   

Evaporator：The AISI316 stainless steel brazed plate heat exchanger has excellent heat exchange effect. The plate heat exchanger is characterized by high heat exchange efficiency, high reliability and high stability. The surface is covered with closed-cell chloroprene insulation material to prevent condensation on the surface of the plate heat exchanger in summer;

In winter, the plate heat exchanger is used as a condenser, and the plate-for-electric heater is built-in to prevent the plate heat exchanger from being frozen under harsh conditions.

Condensing fan：The condensing fan is an axial fan. When a compressor is turned off, the corresponding fan will also be turned off to avoid heat exchange effects on the running fan. The fan blade is three-dimensional, light weight, good rigidity, high precision, stable operation and low noise.

High efficiency air side heat exchanger：The air-side heat exchanger adopts a V-shaped design to improve the condensate drainage capacity and improve the heat exchange effect;

The copper tube adopts a high-efficiency internally threaded copper tube design to improve the heat exchange effect of the refrigerant.

The condensing fins come with hydrophilic aluminum foil to improve the corrosion resistance. The condensing water will not form water droplets, which will not affect the heat exchange effect of the fins.

Frosting logic：Different from the traditional heat pump unit, this unit has a self-developed SMART DEFORST defrosting logic, which can minimize unit downtime and energy consumption during defrosting. This logic enables the unit to analyze the operating conditions, thus avoiding unnecessary defrosting. At the same time, the unit also has a self-regulating function, so that it can run more efficiently, reliably and comfortably.

2.Comparative Analysis of Advantages and Disadvantages of Equipment

three,Matching in engineering applications

According to the comparative analysis of the advantages and disadvantages of each type of equipment, the principle of complementary advantages should be implemented in the project, taking into account factors such as investment, preferably solid heat storage: air source heat pump = 30%: 70% ratio, or 40%: 60% % ratio.