Due to the benefits of recirculating aquaculture system (RAS), many fish farmers are choosing this system. Some chose indoor RAS, where tanks kept inside buildings or greenhouses. Heating and makeup water requires a substantial amount energy since optimum growth temperatures exceed normal temperature supply water. In paper three different heating systems analyzed: ground source heat pump, natural gas boiler wood pellet boiler. The annual running cost in both cases (with recovery no recovery)...

The present article is aimed to investigate influence of the heating rate, temperature (T), pressure (P) on structure and phase transition amorphous Ni material with rate 2 × 105, 106 107 K/s at T = 300 K; 300, 400, 500, 600, 700, 800, 900 1000 K K/s; 621 P 1, 2, 3, 4 5 GPa by molecular dynamics simulation method Sutton-Chen embedded potential periodic boundary conditions. determined through radial distribution function, total energy, size average coordination number. glass relationship...

Reducing the energy consumption for own needs of sources is an urgent task that can be solved by organizing our using potential water vapor in steam screw machines. The article discusses some options installing machines at facilities generating companies and identifies factors affecting return on current operating conditions.

The melting curve of substitutional alloy AB with bcc structure can be obtained by the statistical moment method. effect pressure and impurities on crystal is considered only using solid phase. Numerical calculations have been performed for alloys FeX (X = Ni, Ta, Nb, Cr). Our calculated results are compared experiments other calculations.

The mechanical properties of certain flexible core materials ship structure sandwich panels, having skins made metallic or composite laminates maybe significantly influenced by the temperature variations that may occur during operational loading. At same time, improving knowledge behaviour these panels in terms bending strength and other stress/strain related aspects various harsh conditions increases their superiority weight-to-strength ratio, high stiffness, easy to manufacture, acoustic,...

The road traffic is one of the main sources atmospheric pollution in urban areas. This study aims to identify emissions level for different driving regimes diesel-powered vehicles that run into has been performed laboratory conditions and simulates various modes. paper investigates effects vehicle speed, fuel consumption, acceleration, load on gaseous pollutant (NOx, CO2, CO). levels with smoke are also analyzed between idling (maximum opacity index fast acceleration minimum maximum speed)...

In this work, we build the model and derive theory of nonlinear deformation for substitutional alloy AB with interstitial atom C face‐centered cubic structure under pressure from statistical moment method. The calculation results FCC‐AuCuSi are presented. We obtain values density energy, maximum real stress, limit elastic deformation, stress‐strain curve compare calculated experiments other calculations.

Considering the demands for reduction of fuel consumption involved in generation electrical energy needed classical refrigeration systems, this method uses freezing liquid nitrogen obtained as secondary product at oxygen production.The resulted gas is discharged environment, and, being chemically inert, it does not contribute to harmful chemical components generation.This paper presents some aspects concerning raspberries and blueberries using nitrogen: duration process, capacity, advantages...

The analytic expressions of the mean nearest neighbor distance, free energy and thermodynamic quantities for interstitial alloy AB with body-centered cubic (BCC) structure under pressure are derived by statistical moment method. theoretical results applied to FeH. Our calculated Fe as main metal in good agreement experiments.

Atmospheric dispersion modeling is the mathematical simulation which describe way in pollutants disperse ambient atmosphere. These models are used to estimate concentration of air emitted by industrial plants and also can be predict future concentrations when parameters emission sources changing. Parameters model include: weather conditions such as wind speed direction, atmospheric turbulence ("stability class"), temperature; source (source location height, type, gas exit velocity,...

In this paper, numerical and experimental studies on the influence of thermal field behavior structure sandwich plates in three points bending is analysed. Various materials are used so for skins. For core only extruded polystyrene, with various thicknesses used. The conductivity n was determined by using Hilton B480 unit, based heat flowmeter method described ISO 8301:1991. We have been analyzed 12 cases composite structures. results obtained determination simulation all modeling compared...

The paper presents the experimental and theoretical study for temperature distribution around cooling pipes of an ice rink pad. heat transfer in skating track is nonstationary phase changing. In case rinks equipped with pipe registers, field during formation process can’t be modeled by analytical methods. research was targeted on finding temperatures several points pad also details shape quality pipes. measured ring surface using thermocouples impossible due to larger diameter thermocouple...

Abstract The analytic expressions for the thermodynamic quantities such as mean nearest neighbor distance, free energy, isothermal compressibility, thermal expansion coefficient, heat capacities at constant volume and pressure of binary interstitial alloy with body-centered cubic (BCC) structure small concentration are derived by statistical moment method. theoretical results applied to FeC in interval temperature from 50 1000K atom 0 5%. In special cases, we obtain main Fe metal. Our...

Abstract The analytic expressions of the mean nearest neighbour distance, free energy, absolute stabilizing temperature alloy state and melting for substitution AB with interstitial atom C body-cantered cubic structure under pressure are derived by statistical moment method. theoretical results applied to FeCrC. Our calculated compared other calculations experimental data.

This paper presents an experimental study on the potential use of new type composite as insulation material. The material (AACW-UPR) was synthesised through mixture between Autoclaved Aerated Concrete Waste (AACW) filler and Unsaturated Polyester Resin (UPR) matrix. Several samples with different UPR concentrations (50 70 vol.%) AACW particle size (0.2-1 mm, 1.5-2.5 3-6 mm) were prepared. thermal behaviour water absorption capacity AACW-UPR materials studied. Also, influence resistance...

The paper presents the influence of use rapeseed oil and diesel mixture on engine performance pollutant emissions. main focus study is to identify possibility using mixed with at tractor engines. fuel mix used consists 50% cetane number (CC) 51 refined oil. experimental results have led conclusion that, in case engines, NO NOx emissions can be substantially reduced compared situation when used. Following determinations carried out presented paper, both load idle operation, by a consisting...

The paper presents a study concerning the influence of air conditioning system operation on increase gases emissions from cars. focuses urban operating regimes automobile, when engines have low loads or are at idling. Are presented graphically variations pollution (CO, CO2, HC) depending engine speed and load system. Additionally presented, injection duration, throttle position, mechanical power required by compressor refrigerant pressure variation discharge path, according to stage charging