Schibuola Luigi, Tambani Chiara
University IUAV of Venice, Dorsoduro 2206, 30123 Venice, Italy.
Appl Therm Eng. 2021 May 25;190:116843. doi: 10.1016/j.applthermaleng.2021.116843. Epub 2021 Mar 14.
Strong ventilation increments are currently suggested for containing the airborne diffusion of COVID-19 in indoor environments. However, it can involve an unacceptable growing of energy consumption. Therefore, maximum care must be addressed to improve efficiency of ventilation heat recovery (VHR). For this purpose, this paper investigates the opportunity of a technical solution. Consisting in adding downstream of the most diffuse heat recuperator, a heat pump using exhaust air as a cold source. An autonomous high efficiency air handling unit (HEAHU) was modelled for a school application. By simulation a performance comparison was carried on with two alternative systems based only on an exhaust air heat pump (EAHP) or on a heat recuperator for different weather conditions. Results indicated that the milder climate strongly penalizes heat recuperator and this fact deeply influences the conclusions. HEAHU saving compared to energy consumption of only heat recuperator is between 31% and 46%. For EAHP this saving varies from 2.5% to 48%. Only with a milder climate, EAHP presents a lightly greater saving than HEAHU. Heat pump technology looks to be very performing to foster the efficiency of VHR, especially in presence of high ventilation rates.
目前建议大幅增加通风量，以抑制新型冠状病毒肺炎（COVID-19）在室内环境中的空气传播。然而，这可能会导致能耗不可接受地增加。因此，必须极其谨慎地提高通风热回收（VHR）的效率。为此，本文研究了一种技术解决方案的可行性。该方案是在最常见的热回收器下游增加一个以废气为冷源的热泵。针对学校应用，对一个自主高效空气处理机组（HEAHU）进行了建模。通过模拟，针对不同天气条件，与仅基于废气热泵（EAHP）或热回收器的两种替代系统进行了性能比较。结果表明，较为温和的气候对热回收器极为不利，这一事实对结论有很大影响。与仅使用热回收器的能耗相比，HEAHU的节能率在31%至46%之间。对于EAHP，这一节能率在2.5%至48%之间变化。仅在气候较为温和的情况下，EAHP的节能效果略优于HEAHU。热泵技术在提高VHR效率方面表现出色，尤其是在通风率较高的情况下。
