Solar Direct Expansion System
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In the solar direct-expansion heat pump system, the input and output of the energy both are rely on the phase changing of the refrigerant; all of the components are linked together by the refrigerant. Therefore, it is very important and necessary to select a reasonable pointcut to simplify the calculation process. The compressor which connected ...
Numerical simulation and experimental validation of a
In the solar direct-expansion heat pump system, the input and output of the energy both are rely on the phase changing of the refrigerant; all of the components are linked together by the refrigerant. Therefore, it is very important and necessary to select a reasonable pointcut to simplify the calculation process. The compressor which connected ...
Experimental and numerical investigation on a solar direct-expansion ...
DOI: 10.1016/j.energy.2022.124312 Corpus ID: 248976554; Experimental and numerical investigation on a solar direct-expansion heat pump system employing PV/T & solar thermal collector as evaporator
Experimental investigation of a solar driven direct-expansion heat …
This paper aims to investigate a solar driven direct-expansion heat pump system employing the novel PV/micro-channels-evaporator modules, in terms of its solar thermal, electrical and overall efficiency, as well as coefficient of performance (COP), at the real-time operational condition.
Heat Pump Technologies and Their Applications in Solar …
2.1 Direct-Expansion Solar-Assisted Heat Pump. PV + heat pump Several investigations have been conducted to evaluate the performance of PV-SWHS. Loxsom and Durongkaveroj [] simulated a PV-SWHS with the assumption that the profile of the flow rate versus solar irradiance was two-straight-line segments the study of Al-Ibrahim et al. [], the system …
Performance study on photovoltaic/thermal solar-assisted heat …
This paper reports the energy and exergy performance of a photovoltaic/thermal solar-assisted heat pump system (PV/T-SAHPS) with different solar radiation levels. From the …
Performance Analysis of a Direct-Expansion Solar-Assisted Heat …
The developed system in this investigation is a direct-expansion solar-assisted heat pump that works with both, photovoltaic and thermal solar energy by using photovoltaic panels and a collector (Fig. 1).
Thermodynamic analysis of a direct expansion solar-assisted …
The thermodynamic analysis of direct expansion solar-assisted heat pump system working with R290 as a drop-in substitute for R22 was carried out under the metrological conditions of Calicut, India. A prototype of a DXSAHP system consists of a compressor, an air-cooled condenser with evaporator–collector and thermostatic expansion valve. The …
Analysis of the Potential of Solar‐Assisted Heat …
Shi et al. focused their literature review on the solar-assisted direct expansion heat pumps technology, considering multiple aspects such as the system configurations, performance optimization, and modeling activities.
Review of the advances in solar-assisted air source heat pumps …
The performance of solar assisted air source heat pumps can be evaluated in system level by parameters such as coefficient of performance, seasonal performance factor, energy consumption, solar fraction as well as initial and operating costs, and in component level by parameters such as efficiencies of solar collection and thermal energy storage.
Economic evaluation and annual performance analysis of a novel …
This research presents the economic evaluation and annual energy performance of a novel series-coupled PV/T and a solar thermal collector (TC) with a solar direct expansion …
Integration methodologies for solar-assisted heat pumps
The cheapest and easiest to deploy system is a single-source direct-expansion (DX) configuration for hot water for space heating or domestic hot water. Heat pumps powered by renewable energy...
Experimental and numerical investigation on a solar direct-expansion ...
According to the comparison of economic performance between the PV/T assisted direct-expansion heat pump system and PV/T-TC assisted direct-expansion heat pump system, the hybrid refrigerant-based ...
Direct expansion solar assisted heat pumps: A review of …
A direct expansion solar-assisted heat pump (DX-SAHP) system is a technique of particular interest because it converts and transport heat energy from the sun (source) to water or absorbers (sinks). In comparison with other solar assisted heat pump systems, it has the ability to transfer heat for storage purposes.
Annual comparative performance of direct expansion solar …
An indirect solar-assisted heat pump with both diurnal and seasonal thermal energy storage systems is simulated for a single-family building in Ottawa, Canada. The …
Comparison of solar assisted heat pump systems for heating …
In order to identify these new approaches, DX-SAHP systems can be classified as direct expansion solar-air dual source heat pump (DX-SA-DHP), direct expansion solar-air parallel heat pump (DX-SA-DHP) and direct expansion solar …
Design, Construction, and Thermodynamic Analysis of a Direct …
Abstract. Direct expansion solar assisted heat pump (DX-SAHP) systems have the potential to provide the heat load required for domestic hot water (DHW) sustainably and …
Experimental and numerical investigation on a solar direct-expansion ...
Downloadable (with restrictions)! The objective of the research is to present an investigation on the operational performance of the integrated photovoltaic/thermal system (PV/T) and solar thermal collector (TC) with a heat pump system (PVT-TC) and its potential use for generating high thermal energy and electricity simultaneously. The numerical simulation model and testing rig …
Economic evaluation and annual performance analysis of a novel …
The life cycle cost study of the PV/T-TC solar direct expansion heat pump system and the refrigerant-based PV/T solar direct expansion heat pump system. Conclusion. This research project investigates the economic evaluation and annual performance characteristics of a novel series-coupled PV/T and TC with a solar direct expansion heat pump ...
Control strategy and experimental analysis of a direct-expansion solar ...
Downloadable (with restrictions)! A direct-expansion solar-assisted heat pump (DX-SAHP) system was designed and built in Qingdao China, which was used to supply domestic hot water. The system mainly consisted of a bare solar collector/evaporator with area of 1.56 m2, a rotary-type hermetic compressor with rated power of 400 W, an electronic expansion valve (EEV) and a …
Exergy Analysis of Direct-Expansion Solar-Assisted Heat Pump …
The purpose of this research is to reveal the exergy variation of each component in a direct-expansion solar-assisted heat pump (DX-SAHP) system. Exergy …
Recent advancements in solar collector-evaporator for direct expansion ...
The Direct Expansion Solar Heat Pump (DX-SHP) is an innovative system that combines solar thermal energy and a heat pump to provide sustainable heating solutions. DX-SHP is versatile and can be used for various heating applications like water heating, solar drying, space heating, and industrial process heating.
Analysis of a direct expansion solar assisted heat pump using …
The phase out of refrigerant R-12 makes a majority of studies dealing with the direct expansion solar assisted heat pump system obsolete and not very helpful for future purposes. The goal of the present work is to analyze the thermal performance of a direct expansion solar assisted heat pump with new refrigerants such as R-134a, R-404A, R-410A ...
NUMERICAL SIMULATION OF DIRECT EXPANSION …
system, a relatively more compact direct-expansion solar assisted heat pump (DX-SAHP) has been introduced, in which the solar collector acts as an evaporator. Details of the analytical studies of a CO 2 transcritical cycle on SAHP water heating system are presented in this study.
Experimental investigation on direct expansion solar-air source …
A comparison of the thermal performance of direct expansion solar-air source heat pump system (SAHP-DX) in SAM (solar and air mode) and AM (air mode) operating with R410A is investigated for water heating. Performance characteristics of the system in both summer and winter experimental days are evaluated and compared with respect to T a, I g ...
Experimental investigation on the performance of direct-expansion …
The direct-expansion roof-PV/T heat pump system consists of four main components: (1) a variable frequency scroll compressor, (2) a condenser that acts as heat exchanger between the refrigerant and the cooling medium (water), (3) electronic expansion valves for throttling and reducing pressure and (4) a PV/T evaporation roof acting as an …
Economic evaluation and annual performance analysis of a nov
According to the comparison of economic performance between the PV/T assisted direct-expansion heat pump system and PV/T-TC assisted direct-expansion heat pump system, the hybrid refrigerant-based PV/T-TC assisted direct-expansion heat pump system has a payback period of 5.20 years, whereas the refrigerant-based PV/T assisted direct-expansion ...
Analysis of the Potential of Solar‐Assisted Heat Pumps: Technical ...
In Paradeshi et al., the energy performance of a direct expansion SAHP system, working with a hydrocarbon mixture of R290/R1270, 70:30, is compared with the same system using R22 under realistic conditions of Calcutta. It is found that the selected alternative working fluid mixture has COP about 5.8% higher. ... Another multigeneration and ...
Energetic and Exergetic Performance of Solar-Assisted Direct Expansion ...
This study aims to assess an air-conditioning cycle designed to make use of hydrofluoroolefins (HFOs) within a direct expansion air-conditioning system combined with a solar energy source. An energy–exergy analysis was applied in order (i) to examine which HFO working fluid is more efficient and (ii) to draw a comparative analysis between the proposed cycle and …
Current scientific progress in solar-assisted vapor compression …
Direct-expansion solar-assisted heat pump system has proven to be an effective energy-saving application [[51], [52], [53]]. Many studies have considered the direct expansion type SAHP systems (DX-SAHP) with different types of sub-components. The solar collector or PV panel and HP are integrated into a single unit in this system.
Recent advances in direct expansion solar assisted heat pump
Downloadable (with restrictions)! Direct-expansion solar assisted heat pumps (DX-SAHPs) have a great potential for various applications and are conductive to the environment by using low-temperature ambient energy and solar radiation. This review paper aims at presenting the advancements and the current status of DX-SAHPs. A systematic literature review highlights …
The Effect of Radiation Intensity on the Performance of Direct ...
The objective of this study was to investigate the impact of solar radiation intensity on the performance of direct-expansion solar PVT heat pump systems. To this end, an experimental setup was constructed for direct-expansion photovoltaic (PVT) solar heat pump water heating systems and photovoltaic (PV) power generation systems. The system …
Exergy Analysis of Direct-Expansion Solar-Assisted Heat Pump …
The purpose of this research is to reveal the exergy variation of each component in a direct-expansion solar-assisted heat pump (DX-SAHP) system. Exergy analysis of the DX-SAHP system with R134a is conducted, and the performance evaluation is done. The proposed system is mainly composed of a bare plate solar collector/evaporator, a hermetic …
Experimental study of a direct expansion solar-assisted heat …
Direct expansion solar assisted heat pump (DX-SAHP) can be applied in solar drying, water heating, air conditioning and cold storage [1] DX-SAHP, the refrigerant directly absorbs heat and evaporates in the collector, which enables the system to equip with high evaporation temperature and excellent performance [2].Since Sporn and Ambrose [3] firstly …
Direct-expansion solar-assisted heat pump coupled with …
However, in order to avoid indirect HP''s heat exchanger losses, buffer tank heat losses and bulky space of the buffer tank, direct-expansion solar-assisted heat pump (DX-SAHP) was introduced. In this system, refrigerant is circulated directly inside the solar collector, and it is evaporated in the collector with solar energy.
Effects of Ambient Parameters on the Performance of a …
Research on the direct-expansion solar-assisted heat pump (DX-SAHP) system with bare plate evaporators for space heating is meaningful but insufficient. In this paper, …