Dr. Praveen

Temperature is the major driving factor of the growth and survival of aquatic organisms as it directly affects their immunity, metabolic rate, and oxygen demand. Due to ectothermic nature of aquatic animals such as fish and shellfish, body temperature fluctuates according to changes in the environmental temperature. Increasing water temperatures affect the solubility and availability of oxygen which negatively affects aerobic metabolism. However, changes in the environmental temperature above the organism's thermal threshold will increase the oxygen demand coupled with metabolic shifts as well as also reduce the feed intake and suppress their growth and immunity. Therefore, in our study, we have proposed the thermal modeling of greenhouse integrated semi-transparent photovoltaic thermal (GiSPVT) system integrated with aquaculture water pond. An analytical expression for water pond temperature (thermal energy) and electrical efficiency (electrical energy) in terms of design and climatic parameters has been derived. In this case, thermal energy obtained from the system has been utilised to heat the water pond to maintain desired temperature for aquaculture. The proposed thermal model is valid for all climatic and weather conditions. Special cases of the proposed system namely poly-greenhouse of different shapes have also been discussed. The comparison of fish production in poly-greenhouse has also been compared with the open condition. we have revealed that the production of fish in an underground tank under poly greenhouse gives about 25% higher yield during winter condition as compared to open fish production. This is due to trapped thermal energy inside the poly greenhouse and geothermal energy. Apart from this the experimental validation has also been carried out for water pond temperature.

水温是水生生物生长与存活的核心驱动因素，可直接影响其免疫能力、代谢速率与需氧量。由于鱼类、贝类等水生动物均为变温生物，其体温会随环境水温的变化而波动。水温升高会降低水中氧气的溶解度与可利用量，进而对有氧代谢产生负面影响。但当环境水温超出水生生物的热耐受阈值时，不仅会提升其需氧量并引发代谢失衡，还会降低摄食量，抑制生长与免疫功能。因此，本研究针对与养殖塘耦合的温室集成半透明光伏光热（GiSPVT）系统开展热建模研究。本研究推导得到了基于设计参数与气候参数的养殖塘水温（热能）与系统电效率（电能）解析表达式。该系统产出的热能可用于加热养殖塘水体，以维持水产养殖所需的适宜水温。所提出的热模型适用于所有气候与气象条件。本研究还探讨了所提系统的特殊应用场景，即不同造型的塑料温室，并对比了塑料温室与露天环境下的鱼类养殖产量。研究结果表明，冬季时段，塑料温室下方地下养殖槽的鱼类产量较露天养殖高出约25%，这一现象源于塑料温室内部蓄积的热能与地热资源的协同作用。此外，本研究还针对养殖塘水温开展了实验验证工作。