METHOD AND SYSTEM FOR INCREASING THE COEFFICIENT OF PERFORMANCE OF AN AIR SOURCE HEAT PUMP USING ENERGY STORAGE AND STOCHASTIC CONTROL

摘要

A method and system for increasing the annual average coefficient ofperformance (COP) of anair-to-water air-source heat pump (ASHP) through the use of thermal storageand a controlsystem that activates ASHP operation during times favourable to more efficientoperation. Thismethod uses thermal storage to disaggregate the time of energy production andthe time ofenergy use to increase the COP of the heating system. The efficiency of thesystem can befurther increased through the use of a solar thermal air collector, and asecondary thermalstorage pre-tank for domestic hot water (DHW). A simple stochastic controluses a timedapproach to maximize ASHP operation during hours during the heating seasonthat coincidewith empirical historic maxima in average air temperature and maximum solarirradiance. Anadvanced stochastic control algorithm extends the simple stochastic model touse onlineweather forecasts to calculate projected daily building energy requirementsbased oninformation of the building's modelled annual energy requirements anddetermines optimal andsuboptimal harvest days. The control algorithm has the ability to maximizeASHP operation ondays that will yield the highest annual COR In modelling, the system describedhas the abilityto double the annual efficiency of the ASHP for space heating and DHW, cuttingannual energycosts and greenhouse gas emissions in half. The system can further reducecosts and increaserenewable friendliness by optimizing for time-of-use or dynamic electricitypricing under asmart grid tariff structure.