Zhenxin combined-loop dryer · temperature, humidity and water removal

Working out how much water must go

First agree whether moisture is measured on a wet or a dry basis, and by which method. With wet-basis fractions x_initial and x_final and a starting mass M_initial, the dry solids stay constant, so M_final = M_initial × (1 − x_initial) / (1 − x_final). The water to remove is M_initial − M_final. This is your process balance; the dryer's rating has to meet it.

Record preparation, piece size and how the load is stacked, as well as mass. Batch mass or chamber volume alone does not set the evaporation load. Give Zhenxin the cycle time and quality limits you need, and judge the endpoint by sampling the product.

Open and closed air paths at each stage

Zhenxin combines dehumidification with moisture exhaust and cooling but publishes no air or refrigeration diagram and no operating sequence. Ask how recirculated air is dried, where condensate drains, when moist air is vented, where fresh air enters and what switches the mode. The layout should show the heat-recovery path and every fan, damper and sensor included.

Outside temperature and humidity affect drying whenever fresh air is drawn in. Zhenxin describes the unit as working regardless of climate but gives no rated ambient range. Ask for operating limits and performance at your site's conditions.

Recipe, loading and even drying

Zhenxin gives no control tolerance, sensor position or loaded-chamber uniformity figure for its constant temperature and humidity control. Set the temperature and humidity stages, the highest allowed product temperature and the endpoint and quality tests with your process specialist. Each material needs its own recipe.

Approve the rack, tray or conveyor arrangement, loading density, air path and access. The air has to pass evenly through the load without bypassing it or leaving wet pockets. Trial samples should come from several positions and stages. Ask whether the offer adds circulation fans or airflow reversal beyond the fan on top of the unit.

Energy for the whole drying job

Zhenxin claims higher efficiency, multiple heat recovery and lower energy use, without a tested COP or specific energy figure. Measure electricity for the complete system: compressor, circulation and exhaust fans, controls and any back-up heater. Agree how start-up, standby, defrost or cooling and loading time are counted.

Compare kWh per batch or per kg of water removed only for the same material, moisture basis, load, duration and quality. A good heat-pump COP can still give a high kWh per kg of water if air handling is poor. Zhenxin also mentions 24-hour operation; the trial shows what output the selected unit actually reaches.

Chamber, utilities and what the price covers

The photos give no dimensions, power supply, refrigerant, condensate outlet or chamber connection. Ask for a drawing of the selected unit with service clearances, weight and support needs, electrical current and protection, and the control sheet. List what the offer includes: chamber or panels, racks, ducts, sensors, dampers, drainage, back-up heater and installation.

Zhenxin builds several other dryer types, and its wider catalogue covers chambers of 30–100 m³; ask which applies to this unit. For food, herbs or other sensitive products, agree contact, cleaning and contamination rules for the machine. Zhenxin's honour certificates relate to the company; hygiene, water-removal duty and efficiency for your unit come from its own documents.

Trial, acceptance and handover

Zhenxin publishes no price, MOQ, lead time or warranty period. Tie payment and acceptance to a defined configuration and trial, so you receive a working process with recipes as well as a cabinet.

1. Before selection

   Send material and load, moisture method and endpoints, cycle, quality limits and site utilities and climate.

2. During the factory trial

   Record layout, recipe, temperature and humidity history, uniformity, water removed, cycle time and total energy.

3. At site handover

   Check air, drain and electrical connections, control and fault behaviour and a representative batch; receive recipes, cleaning and maintenance instructions, spares and the written warranty.

Ask Zhenxin to confirm for the combined-loop dryer

Before you order, ask Zhenxin to confirm in writing: the model and refrigerant; water removal per hour at stated air conditions; heating and cooling capacity and power input; the open-loop and closed-loop switching logic; temperature and humidity control range and accuracy; the ambient range it is rated for; chamber size and what is supplied with it; and the trial results on your material.