Showing papers on "Chilled water published in 2017"
TL;DR: In this paper, an artificial intelligence approach for the optimization study of a Tri-bed twin-evaporator adsorption chiller using low-temperature heat from cogeneration is presented.
93 citations
TL;DR: In this paper, a supply-based feedback control strategy is proposed to effectively solve the problems caused by the fast demand response and power limiting control strategy, which employs global and local cooling distributors based on adaptive utility function to reset the set-points of chilled water flow and air flow for each zone and space online.
90 citations
TL;DR: In this paper, the authors present a framework for the formulation and solution of mixed-integer linear programming (MILP) models for operational planning of HVAC systems in commercial buildings.
69 citations
TL;DR: In this article, the performance of a micro-combined heat and power generation system (mCHP) based on PEM fuel cell is analyzed from exergoeconomic aspect of view.
64 citations
TL;DR: In this article, a transient numerical study of two-stage, air-cooled silica gel+water adsorption system producing cooling and potable water is presented. But the authors do not consider the effect of the number of beds on the inter-stage pressure dynamics.
53 citations
TL;DR: In this article, the authors compared the merits of the proposed HDH desalination and cooling are not analyzed and compared in the literature and recommended the use of chilled water in the final stage.
Abstract: Humidification–dehumidification (HDH) desalination works based on a water cycle principle and involves air humidification and condensation (dehumidification). The cooling of humid air with chilled water increases the desalination and results in cold air suitable for air conditioning process. The merits of the proposed HDH desalination and cooling are not analyzed and compared in the literature. Therefore, the performance results of HDH with normal water (current technology) and HDH with chilled water (proposed idea) are compared to highlight the merit of this cycle. The combined cycle for desalination and cooling has been solved thermodynamically with psychrometric properties. The results are validated with a laboratory experimental setup. The examined operational process conditions are hot water inlet temperature, efficiency of humidifier, and vapor absorption refrigerator's (VAR's) evaporator exit temperature. The focused results are desalination, cooling and energy utilization factor (EUF). The comparative study recommends the use of chilled water in the final stage. The two stage desalination with dehumidification by normal water in the first stage and chilled water in combined two stages improves the cycle EUF from 0.18 to 0.33. Out of 300 W of cooling generation, 100 W is used for dehumidification and the remaining 200 W is available for air conditioning process at 15 N⋅m 3 h −1 of air.
48 citations
TL;DR: In this paper, the transient performance of a single effect absorption chiller using the pair LiBr/H 2 O when the overall heat transfer coefficients are varied in time by updating the thermo-physical properties and convective coefficients was investigated.
46 citations
TL;DR: In this article, the effect of number of cycle, switching time, adsorption/desorption time and salinity of saline water on the performance of an organic framework based adaption system in terms of coefficient of performance, specific daily production of ice, slurry mixture and fresh water was investigated.
45 citations
TL;DR: In this article, the performance of two-bed silica gel-water adsorption chiller using flat-tube adsorbers is modelled in wide range of operating conditions.
42 citations
TL;DR: In this article, a modified exergoeconomic method based on energy level is proposed to accord with the principle of high quality and high price, and a case study is presented to analyze the thermodynamic performances of two integrated CCHP schemes and the production cost allocations.
41 citations
TL;DR: In this paper, the main goal of the study is to understand the patterns in which commercial buildings consume energy, rather than evaluating building energy use based on aggregate utility bills typically linked to building principal tenant activity or occupancy type.
TL;DR: In this article, the performance of a Mechanical Vapour Compression (MVC) chiller is experimentally investigated under operating conditions suitable for sensible cooling with the emergence of the energy efficient dehumidification systems, it is possible to decouple the latent load from the MVC chillers which can be operated at higher chilled water temperatures for handling sensible cooling load.
TL;DR: In this article, the performance of direct evaporative air cooling (DEC) was investigated with chilled water, and a prediction model based on heat and mass balance between air and water was developed, the condition line of cooling process was divided into segments for which the enthalpy of air was gradually decreased.
TL;DR: In this article, a sophisticated data trend log was carried out on an air-cooled chiller with advanced heat rejection features, and the authors used the random forest (RF) method to measure variables importance and predict the COP.
TL;DR: In this article, a novel evaporatively air cooled chiller using cold mist water has been investigated experimentally, and experimental results reveal that the proposed system was able to cool ambient air to a temperature below its inlet wet bulb temperature.
TL;DR: In this paper, an alternate solution for dehumidification, with the substitution of the desiccant wheel with solar regeneration in place of a chilled water coil based de-humidifier, was described, and simulations were carried out using EnergyPlus on a reference medium office building to investigate the contribution of solar energy towards the total energy consumption.
TL;DR: In this paper, a systematic method (ECAEL) is proposed for defining additional allocation equations and calculating the exergy cost of flows in thermal system, based on the concept of the energy level, in which the continuous cost change within each component is considered.
TL;DR: In this paper, a double evaporating temperature chiller with double cooling temperatures was proposed for temperature and humidity independent control system (THICS), where a zeotropic mixture R32/R236fa was selected as the refrigerant, and chilled water with two different temperatures was produced.
Abstract: A novel chiller with double evaporating temperatures is proposed in this paper, which can be applied in temperature and humidity independent control system (THICS). A zeotropic mixture R32/R236fa is selected as the refrigerant, and chilled water with two different temperatures is produced. The experimental coefficient of performance ( COP exp ), theoretical coefficient of performance ( COP th ), and second law efficiency ( η ) of the chiller are studied. The performance of the chiller is studied by varying the mass fraction of R32 in the R32/R236fa ( W (R32)), chilled water temperature, and the flow rates of the heat transfer media (chilled water and cooling water). The results show that the high temperature chilled water ( T H,out ) can be at 15–18 °C, and the low temperature chilled water ( T L,out ) can be at 6–8 °C. When T H,out is 17 °C and T L,out is 7 °C, the maximum COP th and COP exp are 4.73 and 3.97, respectively. Second law efficiency, η , increases to 31% as W (R32) increases from 0.3 to 0.6.
TL;DR: In this article, a house-hold VRF based radiant A/C system adopting outdoor air dehumidifier (OAD) was developed and experimentally tested, which employed the VRF system, applying one refrigerant cycle to the OAD to cooling and dehumiding the outdoor air and another to the Refrigerant-Water plate heat exchanger (RWPHE) to providing chilled water for the adopted radiant terminals.
TL;DR: In this paper, the thermal inertia of air-conditioning systems is defined as the character that causes the variation of the supply cooling capacity to zones lagging behind the variations of the cooling capacity from plants after DR strategies are implemented.
TL;DR: In this paper, a vapour compression chiller with subcooling is simulated to analyze the thermodynamic relationship of the sub-cooling power and increase of the cooling capacity, and the parameter RICOSP, defined as the ratio of the rise in the cooling output to the sub cooling power, is derived.
TL;DR: In this paper, the authors proposed an evaluation method based on exergy analysis to evaluate the effects of the design of a central air-conditioning system on the operation performance of equipments and the system.
TL;DR: In this article, a solar system consisting of linear parabolic trough solar collectors' field coupled with a 16kW double effect Lithium Bromide absorption chiller, supplies chilled water to a set of fan coils installed in the 126m 2 laboratory building.
TL;DR: In this article, the authors present a systematic method for quantitative analysis and evaluation of the impact of building load characteristics on the energy performance of district cooling systems (DCS) by introducing the concept of Lorenz curve and Gini coefficient.
TL;DR: In this paper, the authors developed an integrated mine cooling system simulation model to mimic the thermal hydraulic behavior along with the energy consumption of the complete mining cooling system. And the simulation model obtained an average error when compared to the mine's system data of 3.5% for a selected dataset and 2.9% for another dataset one month later.
TL;DR: In this article, the phase change behavior of a new material, CO2 gas hydrate with a salt composition of tetra-n-butyl ammonium bromide (TBAB), tetra nbutyl ionium fluoride and sodium decyl sulfate (SDS), was investigated in a lab-scale cold storage vessel.
TL;DR: In this paper, a new type of compact adsorption chiller applied in the automobile was proposed corresponding with the specification of the automobile installation, and was about 40 L by volume in this paper.
TL;DR: In this paper, a numerical study of refrigeration systems with silica gel/water pairs with mass recovery is presented, in order to extrapolate the results in the Tunisian climate and to determine their optimum values able to maximize the performance under analysis.
Abstract: The technology of adsorption chiller is an efficient way of heat conversion. It can significantly reduce environmental pollution and improve energy efficiency. This paper deals with numerical study of refrigeration systems with silica gel/water pairs with mass recovery. The model is validated with experimental results from the ENERBAT platform. Numerical results are in good agreement with those of experiment. A process of mass recovery is added to study its the effect on the performances of the system. The effect of hot water temperature, cooling water temperature, chilled water temperature and cycle time, on the coefficient of performance (COP), the specific cooling capacity (SCP), the cycled mass, the evaporator outlet temperature and efficiency system are investigated in order to extrapolate the results in the Tunisian climate and to determine their optimum values able to maximize the performance of the system under analysis. The simulation calculation indicates a COP value of 0.7 with a driving source temperature of 85°C in combination with coolant inlet and chilled water inlet temperature of 40°C and 15°C, respectively. The most optimum adsorptiondesorption cycle time is approximately 1240s based on the performance from COP and SCP, achieving a SCP of 400 W/kg.
TL;DR: In this article, a thermal energy storage (TES) and building cooling heating and power (BCHP) system is designed for the new airport terminal building energy supply in Qingdao, China.
TL;DR: In this article, an energy efficient chilled and cooling water network using superstructure optimization approach is proposed to further enhance energy efficiency, secondary waste heat recovery is proposed, and the proposed ARS-VCRS integrated network has reduced the CO2 emission and the overall costs by 53% and 21% compared to VCRS alone.