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New system design for PVT systems coupled with air-to-water reversible heat pump – pv magazine International


Spanish scientists have proposed a brand new technique of mixing photovoltaic-thermal panels with a reversible air-to-water warmth pump in industrial buildings. The system is meant to supply area heating, cooling, home scorching water, and electrical energy.

Researchers on the College of Zaragoza in Spain have proposed a brand new design for vitality techniques primarily based on photovoltaic-thermal (PVT) panels built-in with an air-to-water warmth pump by way of thermal storage tank.

The system is meant to supply area heating, cooling, home scorching water (DHW), and electrical energy in industrial buildings.

“The area heating / cooling distribution circuit makes use of fan coils as terminal items, which permits a minimal provide temperature of 35 C in winter and seven C in summer time,” they mentioned, describing the operational mode of the system . “To extend the usage of low-temperature warmth, DHW is equipped at 50 C as a substitute of 60 C, making common warmth therapies at 60 C to forestall legionellosis in keeping with sanitary laws.”

The scientists examined the proposed system design for five months in an actual system deployed in an industrial facility owned by the Spanish PVT Specialist Endef in Zaragoza. The hybrid pilot plant consists of eight PVT modules with a mixed capability of two.6 kW overlaying a floor of 13.6 m.2two water storage tanks with a capability of 350 l for DHW and 263 l for area heating and cooling, in addition to a Yutaki S6 reversible air-to-water warmth pump offered by the Japanese producer Hitachi.

The warmth pump has a nominal capability of 16 kW in heating mode and 10.5 kW in cooling mode. Its nominal coefficient of efficiency (COP) in heating mode is 4.57 and in cooling mode is 3.31. The DHW water tank makes use of two inside warmth exchangers, one for the photo voltaic circuit and the opposite for the warmth pump. The system can present from 20 C to 60 C in heating mode, from 30 C to 60 C for DHW manufacturing, and from 5 C to 22 C in cooling mode.

The analysis crew used temperature sensors and circulate meters to observe the thermal efficiency of the system and a DC/AC inverter to research that of the PV energy technology unit. “Actual time knowledge monitored on the pilot plant are built-in into the mannequin. The transient mannequin is run with a 5-minute time step, and the outcomes proven on this work are averaged hourly to easy the outcomes, as a result of in any other case the fluctuations will obscure the graphical interpretation and comparability of the outcomes,” it added. “The weekly vitality outcomes are additionally calculated, by integration, to match the weekly efficiency indicators.”

By this evaluation, the lecturers discovered that the system is the potential “whole self-sufficiency” to fulfill the constructing’s vitality wants. In addition they discovered that the pilot plant confirmed little deviation from the simulated setting. “The outcomes present that the warmth pump COP estimated by the transient mannequin is much like that obtained within the pilot plant, with a median error of -10%,” they additional defined.

The proposed system is introduced within the paper “Experimental validation of a photo voltaic system primarily based on hybrid photovoltaic-thermal collectors and a reversible warmth pump for vitality provision in non-residential buildings,” printed in Renewable and Sustainable Power Opinions.

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