超市空调系统英文文献和中文翻译

A multi-scale approach has been formulated in a previous work。 The inﬂuence of HVAC system in supermarket on the performance of vertical open refrigerated display cabinet (VORDC) is considered。 The inﬂuence is evaluated by varying the supply air temperature and velocity at the diffusers of HVAC。 The computational results show that there is a direct interaction between the HVAC system and VORDC in supermarket。 When the supply air temperature of HVAC system decreases from 19 °C to 16 °C, the electricity energy input in VORDC system decreases by 6。36%, and the highest products temperature is reduced by 0。18 °C。 When the diffuser supply air velocity of HVAC system increases from 83974

2。0 m/s to 3。5 m/s, the energy input in VORDC system decreases by 23。4%, and the highest product temperature reduces by 0。4 °C。

1。Introduction

In the vertical open refrigerated display cabinets (VORDC), the air curtain not only provides cooling capacity but also establishes an aerodynamic barriers between conservation space and external environment [1]。 The thermal insulation performance of the air curtain has a great inﬂuence on the perishable food storage and energy consumption for VORDC。 The inﬁltration load through the air curtain is responsible for a major percentage, about 70% [2,3]。 Meanwhile, the energy consumption spent on food preservation is about 50% of the supermarket’s total energy consumption [4–6]。 In recent years, many experiments and numerical studies have been conducted to improve the performance of air curtains。 There are many interdependent factors which act simultaneously on of air curtains, such as discharged air parameters and ambient air conditions [7–10]。 Field and Loth [11] pointed out that the entrain- ment of ambient air was primarily due to eddy engulfment which arose from shear layer interactions and enhanced by high initial turbulence levels in the curtains。 D’Agaro et al。 [12] and Foster et al。 [13] developed a 3D CFD to predict refrigeration power within engineering accuracy。 Yu et al。 [14,15] proposed a two-ﬂuid model to optimize the air curtain effectiveness。 The studies carried

out by Gray et al。 [16] and Wu et al。 [17] showed that a 70–30 distribution of ﬂow between the air curtain and the rear duct per- forations yielded a performance that satisﬁes the standards。 Gaspar et al。 [18,19] developed a detailed CFD VORDC model including the internal ducts, fans and evaporator to get a global performance improvement。 Laguerre et al。 [20] proposed a mathematical model of heat transfer to predict the products temperature in an VORDC under different operating conditions, taking into account of the conduction, convection and radiation。 Chang et al。 [21] developed a 2D CFD model of VORDC to evaluate the inﬂuence of light, veloc- ity in air curtains, ambient temperature and relative humidity on the food package temperature。

Furthermore, if the store indoor environment maintains at a lower relative humidity, it will result in a higher operating cost of HVAC system, but it could reduce frost formation on the refrigerator evaporator coil and anti-sweat heater。 When the store relative humidity was reduced from 55% to 35%, the majority of the refrigerated display cabinet would be saved 20–30% in compressor energy, 40–60% in defrost energy, and 19–73% in anti-sweat heater operation [22,23]。 Orphelin et al。 [24] developed a coupling model including display cabinets and the air-conditioning system to estimate impacts of temperature and humidity on the total energy balance of supermarkets。 Bahman et al。 [25] analyzed the energy saving in a supermarket refrigeration/HVAC system using MATLAB software。

686 X。 Wu et al。 / International Journal of Heat and Mass Transfer 87 (2015) 685–692 超市空调系统英文文献和中文翻译:http://www.youerw.com/fanyi/lunwen_99302.html