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Four types of double-stage Water-Lithium Bromide absorption heat pump systems were introduced to recover waste heat of about 40°C. Thermodynamic and heat transfer numerical simulation was carried out to predict the performance of these absorption heat pumps. The effects of the driving heat source (steam) input pressure, the waste heat outlet temperature, and the hot water inlet temperature on the...
To resolve the problem of reclaiming residual heat of the flue gas for thermal organic media furnace with coal as fuel, a technique project of reclaiming residual heat of the flue gas using heat pipe technology is put forward, and the technology of heat exchanger network is optimized. 1.25MPa steam produced by the heat pipe steam generator reclaiming residual heat of the flue gas can supply supplement...
A desuperheater heat recovery system that includes a reversibly used cooling tower (RUCT) was studied by simulation and field tests in subtropical regions in China. This paper presents the field test of a RUCT heating system using heat pump (RUCTHPS) in winter installed in a test office building, which is located in Changsha, Hunan province, a hot summer and cold winter region in China. Instead of...
Transfer the low-grade heat energy to electricity is an effective way to improve the energy utilizing efficiency and a promising way to reduce the environmental pollution. The Organic Rankine Cycle system is the right technology to realize this transfer and then recover such low-grade heat energy. The general situation of the ORC system in China is introduced, followed by the discussion of the latest...
Deposition of cement kiln ash on the tubes of heat recovery boiler affects the heat exchange efficiency. The basic characteristic of cement kiln ash and the deposition on the tubes with different arrangements are presented. Numerical simulation and experiment measurement show that flow field feature, especially the low-velocity zone and vortex street, causes different shape of ash deposit around the...
This paper establishes a three-dimensional couple numerical model of groundwater flow, heat transferring and solute movement in advantage of the significant variation of groundwater density and viscosity coefficient in energy storage and recovery in brackish aquifer. The revised numerical model is applied to predict the evolution process of the groundwater flow and geo-temperature fields in one 2-dimensional...
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