Direct heat efficient air source heat pump system for energy cascade use

A high-efficiency air and direct heating technology, applied in air conditioning systems, heating systems, hot water central heating systems, etc., can solve problems that cannot be completely solved, achieve good reliability, reduce throttling losses, and have high energy efficiency coefficients Effect

Pending Publication Date: 2020-02-28
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These technologies are helpful to improve the efficiency of heat pumps, but they cannot completely solve the problem, and some key problems still need to be solved

Method used

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  • Direct heat efficient air source heat pump system for energy cascade use
  • Direct heat efficient air source heat pump system for energy cascade use

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Embodiment 1: Normal working mode.

[0025] Such as figure 1 As shown, the normal working mode of the system has two cycles, heat pump cycle and water cycle. In the water circulation system under normal working mode, the fifth cut-off valve 16 and the sixth cut-off valve 17 are closed, the fourth cut-off valve 15 and the seventh cut-off valve 18 are opened, and the high-temperature heating terminal is connected to the low-temperature heating terminal and are located in different rooms respectively. The two are connected in series to work, and water is used as the refrigerant to absorb the heat released from the air cooler, and then to heat the room. The low-temperature heating end can be installed in the bathroom, kitchen, storage room and other places that are not used for a long time, and the high-temperature heating end can be installed in the bedroom that needs to ensure comfort to ensure the best heating comfort. By connecting the two in series, the waste heat af...

Embodiment 2

[0026] Example 2: Low-temperature heating terminal working mode or high-temperature heating terminal working mode

[0027]In some special cases, the occupants may stay in one room so that both heating devices are not required to be activated. In the present invention, four shut-off valves are added in the water circulation system to control two heating equipments. For example, only the low-temperature heating terminal 12 is required to work and the high-temperature heating terminal 13 is not required to work, that is, the fourth shut-off valve 15 and the sixth shut-off valve 17 are closed, and the fifth shut-off valve 16 and the seventh shut-off valve 18 are opened. When only the high-temperature heating terminal is required When working without low-temperature heating terminal work, close the seventh shut-off valve and open the fourth, fifth and sixth shut-off valves. At the same time, the second air cooler 4 is also working to continuously heat tap water to produce sanitary...

Embodiment 3

[0028] Example 3: Reverse cycle defrosting mode

[0029] Such as figure 1 As shown, when the temperature of the surface of the evaporator 5 is lower than the dew point temperature in the air, the water vapor in the air will gradually condense on the surface of the evaporator to form a frost layer, which is a very common phenomenon in winter in the north. In the present invention, the reverse cycle defrosting system is used in the direct heating type high-efficiency air source heat pump system for energy cascade utilization. When the frost layer on the evaporator is too thick and affects the work, the four-way valve 7 will automatically turn to the heating mode. At this time, the original air cooler 2 will be used as an evaporator, and the original evaporator will be used as an air cooler to absorb the heat released from the compressor, so as to achieve the purpose of melting the frost layer. After the frost layer has melted, the four-way valve turns again and returns to the n...

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PUM

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Abstract

The invention provides a direct heat efficient air source heat pump system for energy cascade use. The direct heat efficient air source heat pump system comprises a heat pump cycle, a water cycle, anda sanitary hot water cycle. According to the direct heat efficient air source heat pump system, indoor heating can be ensured, sanitary hot water can be conveniently prepared, and stable and efficient operation of the system is guaranteed. A first air cooler is used for heating a constant-temperature water tank to realize heat supply through a multi-stage heating tail end, and a low-temperature heating tail end and a high-temperature heating tail end are connected in series at the outlet of the water tank and are controlled through four stop valves, so that the energy cascade use is realized,the requirement of household comfort can be met, excessive waste is not caused, and dual purposes can be achieved. Meanwhile, a second air cooler is controlled to heat sanitary hot water through three stop valves, so that the requirement of household water is met. The direct heat efficient air source heat pump system for energy cascade use effectively improves energy efficiency and has high efficiency.

Description

technical field [0001] The invention belongs to the field of heat pumps and relates to a direct heating heat pump. Background technique [0002] A heat pump is a device that uses a small amount of driving energy to convert a large amount of low-temperature energy into high-temperature energy. According to the heat source medium, it can be divided into air source heat pump, water source heat pump and ground source heat pump. Existing air energy heat pumps can be divided into two types: circulating type and direct heating type. The inlet water temperature of the direct heating unit is always kept constant, the heat exchange efficiency is high, the heat absorption capacity is strong, the condensation temperature, the exhaust temperature, the exhaust pressure and the operating current are stable, which greatly prolongs the operating life of the compressor. Therefore, the direct heating Heat pumps are getting more and more attention in practical engineering. [0003] The tempe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F25B30/06F25B41/04F25B47/02F24D3/18F24F5/00F24H4/02F25B41/20F25B41/24
CPCF25B30/06F25B47/02F24D3/18F24F5/001F24H4/02F25B2600/25F25B41/20
Inventor 徐英杰毛成斌
Owner ZHEJIANG UNIV OF TECH
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