Abstract:

Analysis models are established for a multi-functional heat pump unit (MFHPU) for mine cooling, district heating and waste heat recovery in different working conditions and formulae are proposed accordingly in order to study the performance of the MFHPU in heat supply and consumption. Then energy analysis and calculation are developed on theoretical working condition and real working conditions adopting real refrigeration agents. The research result shows: the difference between the input and output energy of the MFHPU system is small, the energy supply and consumption matches well, it is better to reduce condensing temperature, increase evaporating temperature and reduce temperature difference of heat transfer between heat exchangers of the MFHPU and cold or heat sources during design and application of the MFHPU, and the MFHPU has an optimal performance in the working condition wherein cooling and heat recovery are performed simultaneously.

Key words: Multi-functional heat pump unit(MFHPU), mine cooling, waste heat utilization, exergy, energy grading analysis