| Gas Engine-driven Heat Pump (GEHP) is a high performance and energy saving air-conditioning equipment that driven by the gas engine. It has advantages of adjusting the imbalance of electricity, environment-friendly and etc. compared with traditional air-conditioning, so it will be used widely in future. With the improvement of the living standard, the requirement on the acoustics environment also increased, and the problem brought by noise become an impediment to making GEHP commercialized. However, there are few works on controlling noise have been done at present, and this paper conducted a theoretical and experiment investigation on the noise controlling. The main contents of this paper are as follows:Analysis on noise characteristics of the GEHP set should be the foundation to produce effective and concrete measures to control the noise. The testing results reveal that the sound pressure reaches 95.2 dB(A) and the noise of GEHP has the characteristics of wide strip and high peak value.Setting up three-dimensional model of acoustic enclosure and model of double chamber fastness muffler on bases of acoustics spectrum analysis coupled with acoustic theory, this paper analyzes the principle of noise control by the facet of sound-insulation and sound-absorption, which could translate the sound energy into thermal energy finally aiming to reduce noises. Designing acoustic enclosure and double-chamber fastness muffler according to practical situation with other members of the team. And the sound pressure level sharply reduced to 77.8 dB (A) after fixing the application.Processing an simulation by using an acoustic analysis code SYSNOISE on bases of acoustic theory and numerical simulation calculation, to set up an IBEM to carry out a simulation on sound field both surface and inner Acoustic enclosure. The sound sources in the GEHP also emanate heat while radiating noises, combining with the simulating result of cooling performance, the ventilation and sound leakage of GEHP was solved. |
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