2results about How to "Increase evaporating pressure" patented technology

The application relates to a fresh air dehumidification heat pump system based on a new compressor series-parallel transformation step suction and exhaust, a refrigerant circulation flow path comprising a first air inlet coil, a first throttling device, a supply air coil, a first check valve, a return air coil, an exhaust air coil, a first four-way reversing valve and a first compressor which are sequentially connected; further comprising a second four-way reversing valve, a second compressor, a second air inlet coil and a second throttling device which are sequentially connected; further comprising a second check valve which is connected in parallel to the two ends of the supply air coil and the first check valve; the transformation of the series-parallel relationship of the compressors in the cold / heat mode is realized through the first four-way reversing valve and the second four-way reversing valve, so that the step suction / step exhaust forms correspondingly. Compared with the prior art, the two four-way reversing valves are switched skillfully, the switching of the two compressors in series and parallel is completed in the refrigeration and heating modes, and the switching of the step suction and the step exhaust is further realized, so that the unit performance is improved.

The present application relates to heat exchanger performance testing technical field, specifically to a kind of ORC system condenser thermal performance testing device and testing method.The ORC system includes condenser to be measured, working medium storage tank, cooling water tank;From working medium storage tank side, working medium inlet pipeline is sequentially provided with evaporator and pressure regulating valve;Cooling water tank is connected with the cooling system of working medium storage tank by cold water main, and test water circulating pump is arranged on cold water inlet pipeline, and between test water circulating pump and condenser to be measured, cold water inlet pipeline is also connected with the cooling system of working medium storage tank by cold water branch;Cold water inlet pipeline and cold water branch are respectively provided with cut-off valve for adjusting the flow direction of cold water, and working medium storage tank is connected with pressure regulating system, and evaporator is connected with heat regulating system.The testing device provided by the present application can carry out wide-range, multi-condition ORC condenser testing work, and can meet the thermal performance testing requirements of condenser in ORC system.