A companion paper (Bach et al. 2014) experimentally investigated the effects of vapor injected compression and hybrid evaporator flow control on capacity and COP. The goal of this paper is to provide insight into the effects of these technologies on heating seasonal performance (HSPF). HSPF was calculated using a modified version of the ANSI/AHRI 210/240 method, and parametric studies were perf...

The world is looking towards producing products which consume less power without compromising on quality of life. The increase in use of refrigeration and air conditioning appliances are contributing to global warming. The world wide temperatures are shooting up at an increasing rate. This paper presents a design of roll bond evaporator as the heat exchanger to provide cooling in room air condi...

This paper presents a comparable evaluation of R600a (isobutane), R290 (propane), R134a, R22, R410A, and R32 in an optimized finned-tube evaporator, and analyzes the impact of evaporator effects on the system coefficient of performance (COP). The study relied on a detailed evaporator model derived from NIST’s EVAP-COND simulation package and used the ISHED1 scheme employing a non-Darwinian lear...

In this paper, a new R744 heat pump system is studied. The gas cooler, evaporator, indoor core, and cooler are all micro-channel exchangers. high pressure adopts combination of an accumulator internal exchanger (ACCU/IHX). addition, electronic reversible regulating valve added before the outdoor making able to be used as or evaporator. water-cooled condenser can improve performance in cooling h...

Use of angle iron separators in two evaporator vessels at Darnall resulted in a marked reduction in entrainment rates. Efficiencies in excess of 90% were observed with negligible pressure differential across the separator. Separator efficiency can be evaluated rapidly by using a centrally based Auto-Analyser. Introduction To avoid sugar losses by entrainment, all evaporator vessels are fitted w...

Optimization of evaporators with respect to fouling will lead to an increase in runtime and production capacity. Unfortunately optimization processes are often trial-and-error based because the exact mechanism and rate of fouling are not known. This makes the optimization process inefficient and results are often sub-optimal. In order to improve the optimization process a predictive model was d...

The removal of calcium and magnesium ions (softening) from clear juice can be beneficial to downstream processes. Such benefits include reduced evaporator scaling and the improved potential for the application ofion exclusion chromatography for additional sucrose recovery. The results of experiments in the laboratory and on a pilot plant scale are presented. These show that it is possible to so...

Silica presents a particularly challenging problem to the Silica remains one of the most common and problematic components in cane sugar juice evaporator scale. The relationship between silica concentration in clear juice and its precipitation in the evaporator train is considered. Methods of reducing silica levels in clear juice through changes in the extraction conditions are investigated thr...

This paper presents results of a parametric study performed on an automotive air-conditioning (AAC) system of a passenger car. The goals are to assess the effects of varying the volumetric flow rate of supply air, number of occupants, vehicle speed, and the fractional ventilation air intake (XOA), on the dry-bulb temperature and specific humidity of the air inside the passenger’s cabin, and on ...