Abstract
Solar ejector cooling presents an alternative to the commonly used compressor vapour machines. It is a potentially feasible technology for space cooling providing that the temperature of the cooling water is high enough to assure reasonable efficiency of the chiller. This could be achieved by increasing the evaporation temperature of the cooling cycle through its combination with a high-temperature radiant cooling system. We explore the possibilities and benefits of combining a high-temperature radiant wall system with a solar ejector cycle for space cooling of buildings. The lowest water temperature in the wall to prevent condensation was 18°C for the wall with pipes underneath the surface whereas it was 14°C for the wall with pipes embedded in the thermal core. Thus, the evaporation temperature was substantially higher for the radiant systems than for fancoils. For the conventional vapour compressor cooling, this increased the system efficiency (COP) by 30 to 50%. The COP of the ejector cooling cycle was about half of that for the compressor vapour cycle when R1234ze was used as the refrigerant, however, the primary energy was lower for ejector cooling. Using thermally active building systems (TABS) provided a reasonable cool storage capacity for as much as five hours which allows turning the cooling machines off for several hours during peaks in energy demand.
Highlights
The dominant role of buildings as energy consumers and greenhouse gasses producers [1] has led the policymakers to reinforce the requirements on the energy efficiency of buildings in the recently approved EU directives
We explore the possibilities and benefits of combining a high-temperature radiant wall system with a solar ejector cycle for space cooling of buildings
The COP of the ejector cooling cycle was about half of that for the compressor vapour cycle when R1234ze was used as the refrigerant, the primary energy was lower for ejector cooling
Summary
The dominant role of buildings as energy consumers and greenhouse gasses producers [1] has led the policymakers to reinforce the requirements on the energy efficiency of buildings in the recently approved EU directives. Despite the efficiency of the ejector cooling cycle may be lower than that of the compressor vapour cycle, its major advantage is that the main driving force is heat instead of electrical power. Another advantage is that it can use water as the refrigerant with a significantly lower global warming potential than the commonly used halogen carbons. The objectives are defined as follows: Compare the water temperature, the potential of energy storage and thermal dynamics of the three wall cooling systems This data will be used as inputs for the subsequent calculations of the efficiency of the cooling aggregates. Determine the energy benefits of combining the cooling machines with a high-temperature wall cooling system instead of the conventionally used fancoils
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