Onshore oilfields are considered as geothermal fields producing hot water in the high water cut stage (HWCS). In the present study, a supercritical CO₂ power cycle is proposed to recover the heat of the hot water obtained at a temperature close to 140 °C from the oilfield in the HWCS. The output power of the supercritical CO₂ power cycle is expensed to run the compressor of an ejector expansion CO₂ refrigeration cycle. Rejected heat of CO₂ cycles is partially utilized by the HDH (Humidification-dehumidification) desalination unit. It is observed that though there exists an optimum turbine back pressure (TBP) corresponding to a maximum refrigeration effect, fresh water production rate increases with an increasing TBP. However, for each specified evaporator temperature, there is an optimum TBP corresponding to the minimum payback period (PP) of the energy system. The optimum TBP is close to 8.4 MPa for all considered evaporator temperatures and corresponding values of PP varies between 7.65 and 8.25 years. For an evaporator temperature of −15 °C, the refrigeration effect and fresh water production rate are 380.32 kW and 0.349 kg/s, respectively. The proposed energy system is capable of partially satisfying localized energy services like cooling and fresh water supply.

陆上油田被认为是在高含水期（HWCS）产生热水的地热田。在本研究中，提出了一种超临界CO ₂功率循环，以回收HWCS油田从接近140°C的温度获得的热水的热量。超临界CO ₂功率循环的输出功率被花费以运行喷射器膨胀CO ₂制冷循环的压缩机。CO ₂排热HDH（加湿除湿）脱盐装置部分地利用了这些循环。可以看出，尽管存在与最大制冷效果相对应的最佳涡轮背压（TBP），但淡水生产率随着TBP的增加而增加。但是，对于每个指定的蒸发器温度，都有一个与能源系统的最小投资回收期（PP）相对应的最佳TBP。在所有考虑的蒸发器温度下，最佳TBP均接近8.4 MPa，相应的PP值在7.65至8.25年之间变化。对于-15°C的蒸发器温度，制冷效果和淡水生产率分别为380.32 kW和0.349 kg / s。拟议的能源系统能够部分满足局部能源服务，例如冷却和淡水供应。