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Retrofit domestic hot water solution based on PV-driven heat pump, water tank – pv magazine International


Italian scientists have mixed a solar-powered air warmth pump with a water tank for thermal vitality storage to offer scorching water to a residential constructing as a retrofit resolution. They declare that the proposed system configuration can obtain a “fascinating” thermal efficiency whereas minimizing annual energy consumption.

The researchers of College of Bologna in Italy developed a brand new retrofit resolution for home scorching water (DHW) that makes use of a PV-driven air supply warmth pump system that depends on a water tank for thermal vitality storage.

The system is anticipated to interchange conventional electrical boilers and is geared toward decoupling vitality manufacturing and demand. The scientists stated that the innovation of their methodology consists in creating two ranges of thermal vitality storage, to make use of the total potential of the PV system.

“The primary stage of storage is offered by a big centralized water tank geared up with a programmable management system to make use of the water tanks as a buffer and permit the warmth pump to function beneath the specified circumstances situation,” they defined. “The second stage of vitality storage is offered by new slim and modular decentralized tanks, referred to as after e-TANKs, devoted to the manufacturing and storage of DHW, which give increased thermal effectivity and, on the similar time, a higher autonomy to customers by means of native storages positioned in every residence.

The e-TANK consists of a water tank and a hydronic module designed by the Austrian specialist Pink GmbH. The 2 parts are mounted on the wall in a metal body. The tank can be geared up with an inside helical warmth exchanger linked to a 2-pipe scorching water community. This community can be utilized for charging DHW storage tanks or for heating functions. It might probably function at excessive temperature throughout photo voltaic charging. It has decrease warmth loss from the piping community and decrease consumption of circulating pumps in comparison with standard boilers.

By way of the TRNSYS software program, which is used to mimic the conduct of transient renewable methods, the The analysis workforce simulated the proposed system configuration in a residential constructing situated in Catania, Sicily, southern Italy, and assumed that it may very well be powered by a 13.5 kW PV system product of 36 monocrystalline modules.

The electrical energy produced by the PV array could be by means of a reversible air-to-water system, with a heating capability of 26.0 kW and a coefficient of efficiency (COP) of three.10, or saved in a 20 kWh battery. “The utmost water temperature offered by the warmth pump corresponds to 65 °C for outdoor temperatures between 5 C and 19 C,” the researchers stated.

The teachers in contrast the vitality efficiency of the proposed retrofit resolution with the prevailing system within the pilot constructing and located that the system achieved a “fascinating” thermal efficiency within the charging and discharging processes. .

“The outcomes obtained by means of dynamic simulations present that the e-The TANK system reduces the annual vitality consumption for DHW manufacturing by greater than 7,200 kWh, in comparison with the present DHW system,” they defined. “It has been proven {that a} typical centralized system requires about 11 occasions increased electrical vitality for a circulating pump than for e-tank resolution.”

In addition they discovered that, over 20 years, the brand new resolution has a 6.1% decrease life cycle value (LCC) in comparison with conventional boilers. “As well as, it’s identified that the applying of the proposed PV-BESS system for the manufacturing of electrical energy can cut back 7.1 MWh / yr of the required main vitality, in comparison with the case that the electrical energy is offered by the grid,” they emphasised.

The workforce introduced the brand new resolution within the paper “Techno-economic evaluation of a novel retrofit resolution for home scorching water methods: A comparative examine,” printed in Vitality Conversion and Administration. “The outcomes of the present examine for the pilot constructing are anticipated to extend a major a part of the prevailing constructing inventory in Europe,” it concluded.

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