Abstract
In this study, an application of the adapted Co-Heating methodology for thermal performance evaluation of closed refrigerated display cabinets (RDCs) has been presented. A novel test series comprising three experiments has been developed and demonstrated on a commercial RDC with four doors to evaluate the envelope heat transfer coefficient, thermal inertia, infiltration at idle state and dynamic infiltration caused by door operations. The latter two experiments were conducted in parallel with the condensate collection method for validation of the results for infiltration. It was concluded with good (<10%) conformance between the methods that the infiltration at idle state for the tested RDC is approximately 0.022 kg/s and that one 15 s door opening causes approximately 0.94 kg of ambient indoor air to infiltrate. Additionally, the time, equipment and associated costs for running the tests were compared, and it was concluded that the adapted Co-Heating methodology could substitute the condensate collection method for the evaluation of infiltration while providing additional results on the thermal performance.
Highlights
Global initiatives to reduce the climate impact of electrical energy generation are leading to an increased share of renewable energy sources in the energy mix
The adapted Co-Heating method as described in Section 2.1 was applied to an empty refrigerated display cabinets (RDCs) to evaluate its thermal performance in terms of heat transfer coefficient of the envelope (KEnv), heat capacity of the RDC (CRDC), infiltration through gaps (m In f ) and infiltration caused by door openings
For Test (1), the RDC was heated to 64.66 ◦C by a constant supply of 1118.5 W consisting of the summed electrical power from the heater, fans and lights within the RDC gross volume
Summary
Global initiatives to reduce the climate impact of electrical energy generation are leading to an increased share of renewable energy sources in the energy mix. The electrical power generated from renewable energy sources such as solar, wind and wave energies cannot be adapted to the electrical demand in the same flexible way as gas, coal and hydro. There is a need to add energy storage capacity in a grid with a larger share of these non-dispatchable renewable sources (Farhangi, 2010). The purpose of the added energy storage capacity in the grid is to bridge the time-shift between the supply of electrical power from the non-dispatchable sources to the energy demand of the end-users. To provide the needed energy storage capacity, investments in storage infrastructures are required
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