Cascade superhigh temperature water source heat pump apparatus

Abstract

Overlap super high temperature water source thermal pump comprises a low, high temperature compressor in a cabinet in which the medium outlet of evaporizer is connected with the medium inlet of the high temperature gas / liquid heat exchanger by a connecting pipe while its outlet is connected with the medium inlet of a high temperature compressor, the outlet of which is connected with the medium inlet of a condenser and the outlet of which is connected with the inlet of a high temperature electromagnetic valve, which outlet is connected with the inlet of a high temperature gas / liquid heat exchanger, the outlet of which is connected with the inlet of the high temperature expansion valve and its outlet is connected with the evaporizer, with the supplied water temperature by 70-90 deg.C..

Description

(1) Technical field [0001] The invention relates to a heating device, in particular to a cascade ultra-high temperature water source heat pump device that converts low-grade heat energy of groundwater into high-grade heat energy that can be directly used. (2) Technical background [0002] At present, in our country, the heating and heating of buildings, except for part of the central heating for thermal power plants, is almost all for the heating of scattered fuel boiler houses. These heating devices rely on the direct combustion of solid fuel coal or oil to obtain heat, which is not only inefficient, It causes energy waste, and the carbon dioxide gas and smoke produced by combustion cause serious pollution to the environment. With the global energy crisis and the increasing awareness of energy conservation and environmental protection, exploring energy-saving and environmentally-friendly heating devices has become a top priority. [0003] The emergence and development of water s...

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Problems solved by technology

[0004] However, the current water source heat pump heating has not yet reached the standard heating water supply temperature, and its maximum water supply temperature is 60°C, which is far from the minimum standard heating water temperature of 90°C

Moreover, the energy efficiency is relatively low at this time, and the normal working condition of water supply and return is around 50 / 40°C. If it is used in an air-conditioning fan coil cooling system, it can barely be used, but if it is used in a heating system, the water temperature will be low, especially when the old system is renovated. Since the original radiator is configured according to the standard water temperature of 70-90°C

Therefore, the water temperature around 50°C is usually difficult to meet the requirements.

[0005] Since the current water source heat pump devices use medium-temperature refrigerants (such as R 22 ) for stand-alone circulation, this device has a large compression ratio and high condensation pressure, so it is impossible to form a high water supply temperature, and simply use high-temperature refrigerant for stand-alone operation, and can only extract heat from a heat source above 40°C, otherwise The energy efficiency ratio is only about 1.5, so the goal cannot be achieved

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