The Research Of Water Temperature Generation Method And Its Application For River Water Source Heat Pump

It has a lot of advantages for river water heat pump as a form of renewable energy.It has a greater relationship with the handling of the river water quality, reduce inletwater pump energy consumption and improve the efficiency of water source heat pumpunits to better use the river water source heat pump system. Water pump energyconsumption problems are not only relation to the heat and cold of constructions neededand system head, but also, closely related to water temperature, while, the water sourceheat pump efficiency is associated to water temperature. However, current research forthe river water temperature is still relatively few, especially based on the use for watersource heat pump. In this paper, a new water temperature prediction model isestablished used for the water source heat pump system, basing on a study of measuringthe intake water temperature date of river water source heat pump and meteorologicaldate of Typical Meteorological Year, and the actual condensation load under thechanged water temperature is obtained for using that model. Meanwhile, it is proposingchanged water temperature difference for the variation of the water temperature, and acase is calculated to found the effect for the water source heat pump system to use thechanged water temperature difference. The results show that: the condensation(evaporation) load is changed in an actual engineering, as the dynamic river watertemperature. In addition to, this change is increasing with the construction load.The domestic and foreign application status of water source heat pump waterresources and the development and establishment of water temperature model areanalyzed in this article. A water intake temperature data of Chongqing Jialing Riverwater source heat pump is monitored and recorded continuously during4mouths.Combining with the winter conditions water temperature date that monitored by theresearch group, the whole year water temperature date is acquired. After theanalyzations of the water temperature influencing factors, such as hydrological elements,human factors and meteorological parameters, a new water temperature model used forwater source heat pump is established through compared with current water temperaturemodels. Using this water temperature model, combining with the dynamic load changesof residential construction, hotel buildings, office buildings and shopping malls, theriver side condensation (evaporation) load changes is got with the dynamic changes ofwater intake temperature and construction cooling (heat). Comparison with the condensation (evaporation) load changes only according to building cooling (heat)capacity, it is found that they are obvious mismatching each other.River side water temperature changes not only effect the condensation temperature(evaporation temperature), but also the design of intake water temperature difference.Based on the existing literature, a new best intake water difference formula isestablished under summer conditions in this paper. For the sake of the maximum systemefficiency, a best intake water difference is received under different inlet watertemperature through the formula and the water temperature prediction model. And thebest intake water temperature difference changes while the inlet water temperaturechanges. Among the different inlet water temperature, the difference of the intake watertemperature difference is about2℃. On this basis, for a actually case in Chongqing,water pump energy consumption, units energy consumption and system energyconsumption are calculated under5℃,7℃and changed intake water temperaturedifference respectively in summer conditions. The results show: in summer conditions,the highest water source heat pump system energy efficiency is obtained while theintake water temperature difference is7℃, followed by the changed and the5℃intakewater temperature difference. However, when the outside temperature is high, it is notpossible to maintaining7℃intake water temperature difference. If it is designed as that,the building will not meet the required, and it will affect occupant comfort. At the sametime, the water source heat pump system energy consumption is analyzed in changedintake water temperature difference. It turns out that: saving rate up to12percent, themaximum daily reduced electricity around852.864yuan and the CO2emissions as803.131kg.