CN209840458U - Ground source heat pump hot air/water indirect heat exchange soil concurrent heating system - Google Patents

Abstract

The utility model provides a ground source heat pump hot air/water indirect heat exchange soil heat supplement system, which comprises a circulating water pump, a buried pipe heat exchanger with a water inlet connected to the water outlet of the circulating water pump, a water inlet connected to the ground The surface cooler connected to the water outlet of the buried tube heat exchanger and the expansion tank whose water inlet is connected to the water outlet of the surface cooler, the water outlet of the expansion tank is connected to the water inlet of the circulating water pump, and a fixed Pressure replenishment water valve, an air/water indirect forced countercurrent heat exchange device is installed outside the surface cooler, the air/water indirect forced countercurrent heat exchange device includes an air duct and a fan installed inside the air duct, and the surface cooler is located Inside the air duct, the fan is arranged on one side of the air outlet of the air duct. The utility model has the characteristics of low equipment investment cost, low energy consumption for operation, less water consumption, and simple and reliable technology.

Description

A Ground Source Heat Pump Hot Air/Water Indirect Heat Exchange Soil Heating System

technical field

The utility model relates to the field of renewable energy heating (heating ventilation), in particular to a ground source heat pump hot air/water indirect heat exchange soil heat supplement system.

Background technique

The ground source heat pump heating engineering system has high heating efficiency in winter. If the ground source heat pump system is only used for winter heating without considering summer cooling, the project investment will be greatly reduced---saving investment in cooling systems such as fan coil units. However, most of the ground source heat pump projects, if they are only used for heating in winter, without summer cooling or other supplementary heat measures, and the ground source heat pump heating system is only used for heating, generally after two heating periods, the soil temperature is difficult to regenerate (Temperature recovery increases), the heating efficiency of the ground source heat pump system will decrease, and the heating of the ground source heat pump in winter will become unsustainable.

Therefore, general ground source heat pump heating projects need to have the function of cooling in summer at the same time to meet the needs of soil "heat balance", let the soil play the role of energy storage/release, supplement heat to the soil in summer, and obtain heat from the soil in winter. In this way, the soil heat balance is achieved throughout the year cycle. At present, the commonly used heat supplement measures include solar energy supplement heat, waste heat supplement heat and other means, but these supplement heat measures require a lot of investment, or are subject to relatively large conditions. We have also developed soil supplement using direct contact heat exchange between hot air and water. The heating system, but its water loss is too fast, and it needs to replenish water frequently, which has certain disadvantages.

Utility model content

The technical problem to be solved by the utility model is to provide a ground source heat pump hot air/water indirect heat exchange soil heating system with low equipment investment cost, low energy consumption in operation, low water consumption, and simple and reliable technology.

For solving the problems of the technologies described above, the technical scheme that the utility model takes is:

A ground source heat pump hot air/water indirect heat exchange soil heat supplement system, which includes a circulating water pump, a buried pipe heat exchanger with a water inlet connected to the circulating water pump outlet, and a heat exchange between the water inlet and the buried pipe The surface cooler connected to the water outlet of the surface cooler and the expansion tank whose water inlet is connected to the water outlet of the surface cooler, the water outlet of the expansion tank is connected to the water inlet of the circulating water pump, and a constant pressure replenishment valve is set outside the expansion tank.

Further, an air/water indirect forced counterflow heat exchange device is arranged outside the surface cooler.

Further, the air/water indirect forced counterflow heat exchange device includes an air duct and a fan disposed inside the air duct, the surface cooler is located inside the air duct, and the fan is disposed on one side of the air outlet of the air duct.

Further, a filter is arranged in the air duct, and the filter is arranged on one side of the air inlet of the air duct.

Further, the filter is a primary air filter.

Further, the surface cooler is a metal copper tube aluminum wing fin surface cooler.

The beneficial effects produced by adopting the above-mentioned technical scheme are:

The utility model adopts a low-cost equipment investment, low operating cost, simple and reliable technology, and uses the natural energy of hot air above 12°C in spring, summer and autumn to supplement heat, and does not need to use expensive refrigerators for cooling and high power consumption in summer. Supplementary heat, only fans and pumps operate, energy consumption is extremely low, the technology is simple and reliable, the heat in the natural air is transferred to the soil through indirect heat exchange measures, the operation cost is saved, the equipment investment is saved, the efficiency is high, and the technology is simple and feasible.

The utility model adopts the measure of indirect heat exchange and supplementary heat. The hot air and the low-temperature water do not directly contact, but indirect heat exchange through metal copper pipes. The amount of water replenishment saves water consumption and operating costs. This soil heating method greatly saves the investment in the soil heating system of the ground source heat pump heating system, and avoids the technical limitation that the ground source heat pump heating system must be combined cooling and heating. There is no need to adopt high-input air-conditioning and refrigeration systems for combined cooling/heating. The ground-source heat pump heating system with independent heating function combined with the indirect heat exchange of hot air and soil heat supplement measures can realize the soil heat supplement and regeneration problem, which has good promotion and application value.

Description of drawings

Fig. 1 is a schematic diagram of the working principle of the utility model;

Among them, 1. Air duct, 2. Fan, 3. Surface cooler, 31. Heat transfer fins of surface cooler, 32. Metal copper tube of surface cooler, 4. Filter, 5. Expansion tank, 6. Constant pressure Water supply valve, 7. Circulating water pump, 8. Buried pipe heat exchanger, 9. Soil, 10. Circulating pipeline.

Detailed ways

Below in conjunction with accompanying drawing, the utility model is further described.

As shown in Figure 1, this embodiment provides a ground source heat pump hot air/water indirect heat exchange soil heat supplement system, which includes a circulating water pump 7, an underground pipe exchange system with a water inlet connected to the water outlet of the circulating water pump 7 Heater 8 and the surface cooler 3 whose water inlet communicates with the water outlet of the buried tube heat exchanger 8, an expansion tank 5 is also arranged between the surface cooler 3 and the circulating water pump 7, and the expansion tank 5 The water inlet is connected to the water outlet of the surface cooler 3, and the water outlet of the expansion tank 5 is connected to the water inlet of the circulating water pump 7. The expansion tank 5 can change the volume of water due to thermal expansion and contraction due to temperature changes. , to produce absorption and compensation, the circulating water pump 7, the buried pipe heat exchanger 8, the surface cooler 3, and the expansion tank 5 are connected through the circulation pipe 10, and the system uses hot air to exchange heat indirectly through the surface cooler 3, The low-temperature water in the buried heat exchange tube 8 is pumped into the surface cooler metal copper tube of the surface cooler 3 through the circulating water pump 7 to achieve indirect heat exchange with the hot air, and the water temperature of the buried heat exchange tube 8 is increased through water circulation, and the water temperature is increased by using Water transfers the heat in the hot air to the soil 9 as a medium, so as to increase the temperature of the soil 9 and replenish heat for the soil 9.

An air/water indirect forced countercurrent heat exchange device is arranged outside the surface cooler 3, and the air/water indirect forced countercurrent heat exchange device includes an air duct 1 and a fan 2 arranged inside the air duct 1. The surface cooler 3 Located inside the air duct 1, the fan 2 is arranged on the side of the air outlet of the air duct 1, and a filter 4 is arranged in the air duct 1, and the filter 4 is arranged on the side of the air inlet of the air duct 1, so The above-mentioned filter 4 is a primary-effect air filter, which is used for preliminary filtration of air, and is mainly used to filter dust particles above 5 μm, and can also prevent large particles of impurities from clogging the heat exchange fins of the surface cooler 3 . Driven by the fan 2, the air duct 1 directs the hot air to flow toward the surface cooler 3, the fan 2 provides the power of the air flow, the fan 2 drives the air to flow in the air duct 1, and the hot air flows through the surface cooling of the surface cooler 3 Heat transfer fins 31 and metal copper tubes 32 of the surface cooler, the cold air after cooling is blown out of the air duct 1, the surface cooler 3 adopts metal copper tubes and aluminum wing fins, and water is in the metal copper tubes 32 of the surface cooler Flow, the hot air flows through the heat transfer fins 31 of the surface cooler, and conducts the heat of the hot air to the cold water in the metal copper tube 32 of the surface cooler. Since there is a huge temperature difference of 10.0°C to 25°C between the cold water and the hot air (cold water Generally 7-8°C, hot air is generally between 15°C-35°C), even as long as the air temperature is 7-8°C higher than the soil temperature, the indirect heat exchange between cold water and hot air can be realized, and energy transfer can be realized, thereby realizing heat transfer. The air energy is transferred to the soil by indirect heat exchange through the surface cooler 3 .

The expansion tank 5 is provided with a constant pressure replenishment valve 6 to supply constant pressure water to the system to ensure the normal operation of the system.

The specific working process is as follows:

Driven by the circulating water pump 7, the low-temperature cold water flows out from the buried tube heat exchanger 8, and enters the surface cooler 3 from point A of the water inlet of the metal copper tube 32 of the surface cooler 3. After the low-temperature water absorbs heat Flow out from the water outlet point B of the surface cooler metal copper pipe 32 of the surface cooler 3. Due to the existence of the temperature difference between the hot air and the cold water, the hot air is driven by the fan 2 to accelerate through the surface of the surface cooler 3. The heat transfer fins 31 of the cooler conduct heat to the cold water in the metal copper pipe 32 of the surface cooler. The cold water absorbs heat and raises the temperature to become hot water. After the hot water flows through the expansion tank 5, it flows into it under the pressure of the circulating water pump 7 In the buried tube heat exchanger 8, heat is transferred from the buried tube heat exchanger 8 to the soil 9, and the hot water in the buried tube heat exchanger 8 exchanges heat with the soil 9, and the temperature of the soil 9 rises. Form cold water, and then lift it to the surface cooler 3 to absorb heat through the circulating water pump 7, and complete the entire heat cycle heat transfer process of heat absorption and heat release. The amount of water replenishment saves water consumption and operating costs.

The above description of the disclosed embodiments enables those skilled in the art to realize or use the utility model. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the present invention will not be limited to these embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims (6)

1. A ground source heat pump hot air/water indirect heat exchange soil heat supplement system, characterized in that it includes a circulating water pump (7), a buried pipe heat exchange with a water inlet connected to the water outlet of the circulating water pump (7) (8), the surface cooler (3) whose water inlet is connected to the water outlet of the buried pipe heat exchanger (8), and the expansion tank (5) whose water inlet is connected to the water outlet of the surface cooler (3) , the water outlet of the expansion tank (5) communicates with the water inlet of the circulating water pump (7), and a constant pressure replenishment valve (6) is arranged outside the expansion tank (5). 2. A ground source heat pump hot air/water indirect heat exchange soil heat supplement system according to claim 1, characterized in that an air/water indirect forced countercurrent heat exchange device is arranged outside the surface cooler (3). 3. A ground source heat pump hot air/water indirect heat exchange soil heat supplement system according to claim 2, characterized in that the air/water indirect forced countercurrent heat exchange device includes an air duct (1) and a The fan (2) inside the air duct (1), the surface cooler (3) is located inside the air duct (1), and the fan (2) is arranged on one side of the air outlet of the air duct (1). 4. A ground source heat pump hot air/water indirect heat exchange soil heating system according to claim 3, characterized in that a filter (4) is arranged in the air duct (1), and the filter (4) Set on one side of the air inlet of the air duct (1). 5. A ground source heat pump hot air/water indirect heat exchange soil heating system according to claim 4, characterized in that the filter (4) is a primary-effect air filter. 6. A ground source heat pump hot air/water indirect heat exchange soil heat supplement system according to claim 1, characterized in that the surface cooler (3) is a metal copper tube aluminum wing fin surface cooler.