Why publish plant B separately from plant A?

Same technology family, different site scale (hot-water volume) and distinct ops lessons (auxiliary-receiver liquid path, strainer cleanliness, shaft-seal monitoring). Keeping them separate avoids mixing site-reported figures.

Is the plant’s proposed discharge-header heat exchanger included as proven?

No. It is recorded as a plant suggestion (sensible-heat recovery 80→65°C ammonia with free water temperature lift) and is not independently verified in this publication.

← All cases

Central China meat plant B: ammonia HP for plant hot water — coupling & ops lessons

Author field survey (2024-05): same ammonia HP architecture as plant A at a second Central China meat site; plant-reported ~200–300 m³/day hot water and ~¥100k/month steam savings, plus liquid-path and cleanliness lessons.

Engineering data

Case type: Anonymized field reference
Data status: anonymized_field_reference
Industry: Food
Source temperature: 28–35°C
Sink temperature: 50–70°C
Temperature lift: ≈ 15 K
Heating or cooling duty: Not disclosed
Architecture: Ammonia mid-temperature heat pump; liquid drain should enter the auxiliary receiver (winter oil-cooler feed) rather than only the main receiver
Result status: Overall operation reported as good; plant continues to displace purchased steam for hot water
Key risk: First-year oil change; shaft-seal leak monitoring; installation cleanliness (strainer impurities); plant suggestion of a discharge-header sensible-heat exchanger (80→65°C ammonia / free water lift) is unverified
Existing system: Purchased steam for process hot water; ammonia refrigeration available as reject-heat source
Refrigerant: R717 (ammonia)
COP: Not disclosed
Annual savings: Plant-reported: ~¥100k/month steam-cost savings vs purchased steam — not independently metered here
Estimated payback: Not disclosed as a verified figure

Ammonia heat-pump package with insulated vessels and red process piping — Field survey photo (anonymized): ammonia heat-pump package at meat plant B.

Insulated and color-coded liquid drain / process piping under a platform — Field survey photo (anonymized): liquid-drain and process piping near the refrigeration interface.

Heat-pump HMI operating-status screen during site survey — Field survey photo (anonymized): operating-status panel observed on site (not an independent metering audit).

Shaft-seal leak collection bottle on the package frame — Field survey photo (anonymized): shaft-seal leak monitoring — an operations risk observation, not a marketing claim.

Interior of an oil strainer showing sediment and impurities — Field survey photo (anonymized): oil strainer with visible impurities — installation cleanliness lesson.

Project background

A second Central China meat-processing site runs an ammonia heat pump coupled to plant refrigeration for process hot water. The author surveyed the installation in May 2024 (day after plant A). Customer identity is omitted.

Source / inputs

Source: ammonia discharge / condenser heat. Sink: plant hot water, plant-reported ~200–300 m³/day. No independent heating-capacity or COP table is published here.

Heat pump solution

Same architecture family as plant A: ammonia HP with preheater + condenser-evaporator. Field notes stress routing liquid drain into the auxiliary receiver so winter oil-cooler feed remains available, separating make-up and hot-water connections to the tank, and improving shop cleanliness during install.

COP & savings

Field survey by the author; daily hot-water volume and monthly steam savings as reported by the plant — not independently metered on this site. HMI and leak/oil photos are observational ops evidence only.

Investment / ROI notes

Plant-reported ~¥100k/month steam savings. CAPEX / payback were not confirmed as publishable verified figures for this site. Treat economics as site-reported.