Compound type two-stage lithium bromide absorption type heat pump and working method

Abstract

The invention discloses a compound type two-stage lithium bromide absorption type heat pump and a working method. The lithium bromide absorption type heat pump comprises two lithium bromide heat pumpunits which are mutually connected; the first lithium bromide heat pump unit comprises a first evaporator, a first generator, a first absorber and a first condenser which are mutually connected; the second lithium bromide heat pump unit comprises a second evaporator, a second generator, a second absorber and a second condenser which are mutually connected; and the output end of a heat exchange pipe of the first absorber sequentially communicates with heat exchange pipes of the second absorber, the second condenser and the first condenser. The invention further discloses the working method of the compound type two-stage lithium bromide absorption type heat pump. On the one hand, under the conditions that medium warm water and low warm water conditions are certain, the temperature of the unit generators is reduced, and the service life of the units is prolonged; on the other hand, the steam discharge range of the units is enlarged, the type selection of the units is reduced advantageously, and the cost is reduced; and the units are very convenient to manufacture.

Description

technical field [0001] The invention relates to the technical field of air-conditioning equipment, in particular to a composite two-stage lithium bromide absorption heat pump and its working method. Background technique [0002] Due to serious homogeneity in the current heat pump market, the difference in parameters determines the amount of low-temperature waste heat recovery, which in turn affects the total investment and payback period of the entire project. Under the same conditions, the lower grade requirement of the driving heat source or the higher temperature of the hot water will play a decisive role in the project. [0003] For example, under the conditions of low temperature water 20 / 30°C and medium temperature water 40 / 90°C, the traditional absorption heat pump unit is used, and the process is as follows figure 1 Shown: 40°C medium-temperature water is heated to 90°C after passing through the absorber and condenser in turn, and the heat source required for heatin...

AI Technical Summary

Problems solved by technology

[0003] For example, under the conditions of low temperature water 20 / 30°C and medium temperature water 40 / 90°C, the traditional absorption heat pump unit is used, and the process is as follows figure 1 Shown: 40°C medium-temperature water is heated to 90°C after passing through the absorber and condenser in turn, and the heat source required for heating the medium-temperature water in the condenser comes from the generator, which requires a higher-grade input driver in the generator The heat source, that is, the steam pressure is required to be as high as 0.6MPa, and the generator temperature is 155°C. The pressure and temperature are relatively high, and there will be the following defects: (1) It is not conducive to the long-term operation of the unit, and the generator is in a high temperature state for a long time, which will reduce The service life of the unit; (2) The exhaust range of the unit is very small, and the selection of the unit will be too large, which will reduce the thermal efficiency of the unit, increase the cost, and occupy the space

Images